The big difference is just that electrics weigh in with batteries installed and wet fuel ships weigh in with an empty tank. What does your #160 weigh fully loaded with fuel? In general, the batteries are going to amount to about 20-25% of the total weight (my 4900mah batteries weigh in at just under 1200g) but the motor weighs about 350+g LESS than a YS170 (580-620g for the electric vs. 960g for a YS170) and the total electric power system (counting ESC) should be under 40% of the all up weight of the aircraft, in my case it comes to just under 38%. Glow fuel undoubtedly brings your power system in to a much lower % of the all up weight, even counting a couple hundred grams of fuel fully loaded and the muffler/pipe, but airframes seem to weigh more because they are built to handle a lot more vibration than you get from an electric. <div>
<br></div><div>That said, I don't think we're going to "extraordinary" measures to save weight, we're just trying to take full advantage of the components we already have to have (like the main system battery) to serve double duty without giving up redundant power in the system as a whole. In my case, discovering I was 30g overweight I had no trouble shaving the weight: Swap a 1350 RX battery for a 450 RX battery (saving 38g), add Chris' main tap as a redundant power supply to the RX (previously I'd just left the second power lead to the RX unused and gone without redundancy) at a cost of probably 3g (no regulator needed, though if I can find a decent one with minimal weight penalty I'll add it) and now I'm 5g under the limit. Since I was on Chris' store and didn't want to get just the power tap, I decided to give a Falcon V2 carbon prop a try, saving me another 30g. I could easily swap out my convenient Secraft wire tensioning system to save another 10-20 grams. I have an irrational dislike of carbon spinners after having one shatter on me a while back, so I use a 49g Aluminum Tru-turn spinner, if I were really up against the weight gun I'd swap that out and save another maybe 20g. So with no extraordinary measures I reduced my weight by 65g and added redundant power. Minor tweaks I would prefer not to make would save me another 20-80g. Extraordinary measures would replace my beloved Emcotec arming switch for the main power system with something simple and lighter like the power unlimited arming plug :-) </div>
<div><br></div><div>And, of course, I never have to worry about my engine dying in flight, cleanup of glow residue, etc.</div><div><br></div><div>Glow->Electric conversions are suboptimal in my humble opinion because you are essentially bolting a much heavier power system onto a heavy airframe designed for a bone-shaker of a glow engine, so it's built much heavier than it needs to be for electric power.</div>
<div><br></div><div>Peter+<br><br><div class="gmail_quote">On Wed, Jan 25, 2012 at 3:49 PM, J N Hiller <span dir="ltr"><<a href="mailto:jnhiller@earthlink.net">jnhiller@earthlink.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-US" link="blue" vlink="blue">
<div>
<p class="MsoNormal"><span><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial">Hi Mike.<u></u><u></u></span></font></span></p>
<p class="MsoNormal"><span><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial">If I could
get rid of my greasy stuff I think I'd go all electric but after reading of the
extraordinary measures taken to save a few grams it kind of depends what I can
get an E-Option to weigh. My #2 160 is 10 lb so I could probably do it. I need
to lookup component weights and get an estimated allowable airframe weight to compare.
Maybe next winter; I'll fly what I've got another season and work on improving
piloting skill, if that’s possible any more. I've never been a switch flipper
but I'm thinking I need to start. <u></u><u></u></span></font></span></p>
<p class="MsoNormal"><span><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial"><u></u> <u></u><u></u><u></u></span></font></span></p>
<p class="MsoNormal"><span><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial">Jim<span> </span><u></u><u></u></span></font></span></p><div><div class="h5">
<p class="MsoNormal"><span><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial"><u></u> <u></u><u></u><u></u></span></font></span></p>
<p class="MsoNormal" style="margin-left:.5in"><font color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma">-----Original
Message-----<br>
<b><span style="font-weight:bold">From:</span></b>
<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org" target="_blank">nsrca-discussion-bounces@lists.nsrca.org</a>
[mailto:<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org" target="_blank">nsrca-discussion-bounces@lists.nsrca.org</a>]<b><span style="font-weight:bold">On Behalf Of </span></b>astropuppy<br>
<b><span style="font-weight:bold">Sent:</span></b> Wednesday, January 25, 2012
12:47 PM<br>
<b><span style="font-weight:bold">To:</span></b> General pattern discussion<br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [NSRCA-discussion]
Main battery redundant lead for receiver</span></font></p>
<p class="MsoNormal" style="margin-left:.5in"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><u></u> <u></u><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:.5in"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">You know you
want to go E Jim. As they say in Oregon: "Just do it".</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:.5in"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt"><u></u> <u></u></span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-right:0in;margin-bottom:12.0pt;margin-left:.5in"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">Mike</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:.5in"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">On Wed, Jan
25, 2012 at 9:47 AM, J N Hiller <<a href="mailto:jnhiller@earthlink.net" target="_blank">jnhiller@earthlink.net</a>>
wrote:</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<div style="border:none;border-left:solid #cccccc .75pt;padding:0in 0in 0in 6.0pt">
<p class="MsoNormal" style="margin-left:40.8pt;border:none;padding:0in"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">
</span></font></p><div bgcolor="white" link="blue" vlink="purple"><font color="navy" face="Arial">Having judged these sequences I
absolutely agree that they have become more demanding. Do you think you could
fly the current schedules with 2006 battery technology?</font></div><font color="black"><span style><u></u><u></u></span></font><p></p>
<p class="MsoNormal" style="margin-left:40.8pt;border:none;padding:0in"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">Not in a
hurry to go E-Power but interested.</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:40.8pt;border:none;padding:0in"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy">Jim</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:40.8pt;border:none;padding:0in"><font color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;color:navy"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
</div>
<div style="border:none;border-left:solid #cccccc .75pt;padding:0in 0in 0in 6.0pt">
<p class="MsoNormal" style="margin-left:76.8pt;border:none;padding:0in"><font color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma">-----Original
Message-----<br>
<b><span style="font-weight:bold">From:</span></b> <a href="mailto:nsrca-discussion-bounces@lists.nsrca.org" target="_blank">nsrca-discussion-bounces@lists.nsrca.org</a>
[mailto:<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org" target="_blank">nsrca-discussion-bounces@lists.nsrca.org</a>]<b><span style="font-weight:bold">On Behalf Of </span></b>Del<br>
<b><span style="font-weight:bold">Sent:</span></b> Wednesday, January 25, 2012
6:55 AM<br>
<b><span style="font-weight:bold">To:</span></b> General pattern discussion<br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [NSRCA-discussion]
Main battery redundant lead for receiver</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:76.8pt;border:none;padding:0in"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:76.8pt;border:none;padding:0in"><strong><b><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue">Dave.. Love how you win your discussions.. lol .. ;+} </span></font></b></strong><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:76.8pt;border:none;padding:0in"><strong><b><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue"> </span></font></b></strong><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:76.8pt;border:none;padding:0in"><strong><b><font size="3" color="blue" face="Arial"><span style="font-size:12.0pt;font-family:Arial;color:blue"> Del</span></font></b></strong><font color="black"><span style><u></u><u></u></span></font></p>
</div>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial">----- Original Message
----- </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<div style="border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt">
<p class="MsoNormal" style="margin-left:40.8pt;border:none;padding:0in"><b><font size="3" color="black" face="Arial"><span style="font-size:12.0pt;font-family:Arial;font-weight:bold">From:</span></font></b><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:40.8pt;border:none;padding:0in"><font color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial"><a href="mailto:DaveL322@comcast.net" title="DaveL322@comcast.net" target="_blank">Dave Lockhart</a> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
</div>
<p class="MsoNormal" style="margin-left:80.55pt"><b><font color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;font-weight:bold">To:</span></font></b><font color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial"> <a href="mailto:nsrca-discussion@lists.nsrca.org" title="nsrca-discussion@lists.nsrca.org" target="_blank">'General pattern discussion'</a> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><b><font color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;font-weight:bold">Sent:</span></font></b><font color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial"> Tuesday, January 24, 2012 7:07 PM</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><b><font color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial;font-weight:bold">Subject:</span></font></b><font color="black" face="Arial"><span style="font-size:10.0pt;font-family:Arial"> Re: [NSRCA-discussion] Main battery redundant lead for receiver</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d">2006</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d">9411sa x2 for
ailerons</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d">8417sa x1 for
elevator</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d">8411sa x1 for rudder</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d">2009</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d">Changed to 3517 x2
for elevator (in the same plane)….no change in mah per flight</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d">2010</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d">Changed to 8611A on
rudder (in the same plane)….no change in mah per flight</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d">Flight times are
about 45 seconds shorter now.</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d">I still have the
Prestige I flew in 2006, so no change to control surface size or throw.</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d">I’m pretty sure it
is the changes in maneuvers flown and higher average watts used by the motor in
the course of the flight. </span></font><font color="#1f497d" face="Wingdings"><span style="font-size:11.0pt;font-family:Wingdings;color:#1f497d">J</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d">Regards,</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d">Dave</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><b><font color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma;font-weight:bold">From:</span></font></b><font color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma"> <a href="mailto:nsrca-discussion-bounces@lists.nsrca.org" target="_blank">nsrca-discussion-bounces@lists.nsrca.org</a> [mailto:<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org" target="_blank">nsrca-discussion-bounces@lists.nsrca.org</a>]
<b><span style="font-weight:bold">On Behalf Of </span></b>Peter Vogel<br>
<b><span style="font-weight:bold">Sent:</span></b> Tuesday, January 24, 2012
6:59 PM<br>
<b><span style="font-weight:bold">To:</span></b> General pattern discussion<br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [NSRCA-discussion]
Main battery redundant lead for receiver</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">Digital servos *definitely* draw more
power than non-digitals, but they are much more precise and hold their position
better, it's worth the higher draw for pattern.</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;margin-left:80.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">Peter+</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">On Tue, Jan 24, 2012 at 3:46 PM, Doug
Cronkhite <<a href="mailto:seefo@san.rr.com" target="_blank">seefo@san.rr.com</a>>
wrote:</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">I suspect the servos also draw more power
than they did years ago.</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">Doug <br>
<br>
Sent from my iPhone</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;margin-left:80.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt"><br>
On Jan 24, 2012, at 3:40 PM, "Dave Lockhart" <<a href="mailto:DaveL322@comcast.net" target="_blank">DaveL322@comcast.net</a>>
wrote:</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-right:.5in;margin-left:116.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d">When I first started
flying electric pattern…..mah per flight was noticeably lower than now, going
from 40-60 per flight to 60-80 per flight…..flying whatever was the current P/F
sequences. I suspect the increase is due to higher average flight speeds
(much more watts at the motor now) and more demanding maneuvers (snaps and KE).</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-right:.5in;margin-left:116.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-right:.5in;margin-left:116.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d">Regards,</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-right:.5in;margin-left:116.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-right:.5in;margin-left:116.55pt"><font color="#1f497d" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:#1f497d">Dave</span></font><font color="black"><span style><u></u><u></u></span></font></p>
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<p class="MsoNormal" style="margin-right:.5in;margin-left:116.55pt"><b><font color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma;font-weight:bold">From:</span></font></b><font color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma"> <a href="mailto:nsrca-discussion-bounces@lists.nsrca.org" target="_blank">nsrca-discussion-bounces@lists.nsrca.org</a> [mailto:<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org" target="_blank">nsrca-discussion-bounces@lists.nsrca.org</a>]
<b><span style="font-weight:bold">On Behalf Of </span></b>Keith Hoard<br>
<b><span style="font-weight:bold">Sent:</span></b> Tuesday, January 24, 2012
11:02 AM<br>
<b><span style="font-weight:bold">To:</span></b> General pattern discussion<br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [NSRCA-discussion]
Main battery redundant lead for receiver</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-right:.5in;margin-left:116.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-right:.5in;margin-bottom:12.0pt;margin-left:116.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">Anthony,<br>
<br>
On a typical flight, I'm guessing the radio only uses around
100-150Mah of power, while the motor is using 4000Mah, so that's about 4% more
draw on those two cells. In practice, I haven't been able to see any
difference in the radio cells when I hook them up to my charger at the end of a
flight. Sometimes cells #1 & #2 are the high cells after a flight, so
I think the power draw of the radio is negligible to our motor packs.<br>
<br>
The problem with two regulators plugged into the same 10S (or 5S) pack is that
you are creating a dead short between the cells thru the ground wires
(typically a straight wire thru the regulator). <br>
<br>
Say you plug Regulator #1 into cells #1&2, and Regulator #2 into cells
#6&7. The regulator's <b><i><span style="font-weight:bold;font-style:italic">ground </span></i></b>wires now have 5 cells of voltage potential (5 X
4.2V = 21Volts) between them since they are plugged into cells # 1 and #6.
When those two ground wires are then plugged into your receiver either thru a
switch or direct connection the magic smoke will escape and your retailer will
rejoice.<br>
<br>
Also, if you have both of your regulators plugged into your motor pack and the
packs eject like Goose in Top Gun, you've lost both of your redundant power
sources. However, if you use a tiny 2S LiPo that is physically separated
and secured inside your plane, you have both electrical and physical
redundancy. <br>
<br>
Hmmm, just thought of something . . . maybe we should tie down the receiver so
the main regulator can't take the receiver out with it. . . so many
contingencies, so little weight . . .<br clear="all">
<br>
Keith Hoard<br>
Collierville, TN<br>
<a href="mailto:khoard@gmail.com" target="_blank">khoard@gmail.com</a></span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-right:.5in;margin-left:116.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">On Tue, Jan 24, 2012 at 8:15 AM, Anthony
Romano <<a href="mailto:anthonyr105@hotmail.com" target="_blank">anthonyr105@hotmail.com</a>>
wrote:</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-right:.5in;margin-left:116.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">Seems like a great idea but I have two
questions. Do the packs come down out of balance since two cells are serving extra
load? Is there a problem with parallel operation of two regulators?<br>
<br>
Thanks,<br>
<br>
Anthony<br>
</span></font><font color="black"><span style><u></u><u></u></span></font></p>
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<hr size="2" width="100%" align="center">
</span></font></div>
<p class="MsoNormal" style="margin-right:.5in;margin-left:116.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">From: <a href="mailto:joddino@socal.rr.com" target="_blank">joddino@socal.rr.com</a><br>
Date: Mon, 23 Jan 2012 15:25:00 -0800<br>
To: <a href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank">nsrca-discussion@lists.nsrca.org</a><br>
Subject: Re: [NSRCA-discussion] Main battery redundant lead for receiver<br>
<br>
I've been using this setup for sometime and it is working great. I have
my two cell LiPo charged to 7.5 volts and it is connected to a 6.0 volt
regulator into the receiver. The cable connected to the balance connector
on the "bottom" 5S is connected to a 6.3 volt regulator so it
supplies all the current to the system and the 2S pack never needs charging.
I'm using an 800 mAh pack but it could be even smaller. </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-right:.5in;margin-left:116.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-right:.5in;margin-left:116.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">Jim O</span></font><font color="black"><span style><u></u><u></u></span></font></p>
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<p class="MsoNormal" style="margin-right:.5in;margin-left:116.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-right:.5in;margin-left:116.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">On Jan 23, 2012, at 2:09 PM, Scott McHarg
wrote:</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-right:1.0in;margin-left:152.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt"> </span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-right:1.0in;margin-left:152.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">Guys,<br>
Chris Moon just e-mailed me about some leads that were done at the
factory. These leads run off your balance leads to a voltage regulator
and allow your main battery pack to be utilized as a redundant receiver
battery. It is NOT meant to be a primary but it will save 20+ grams if
you're running 2 rx batteries. You still have to run the 2nd regulator
for true redundancy but you eliminate the 2nd battery. These leads are
factory made and eliminate the need to make them yourself with the concern
about plugging in to the wrong cell. I know in my article, I was pretty
much against doing this as a backup but, with Chris having this made at the
factory, he has all but eliminated making a mistake by tying to the wrong
cell. I have the link that I'll e-mail you off-list or you can just go to
his website. I don't want to break the NSRCA list rules by advertising
for him even though he advertises with the NSRCA. The leads are only
$3.99 each and are found under the Connectors/Adapters listing.<br>
<br>
Thank,<br>
Scott<br clear="all">
<br>
-- <br>
</span></font><b><font size="4" color="#3333ff" face="Comic Sans MS"><span style="font-size:13.5pt;font-family:"Comic Sans MS";color:#3333ff;font-weight:bold">Scott A. McHarg</span></font></b><font color="black"><span style><br>
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<p class="MsoNormal" style="margin-left:80.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">Director, Fixed Wing Flight Training</span></font><font color="black"><span style><u></u><u></u></span></font></p>
<p class="MsoNormal" style="margin-left:80.55pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">Santa Clara County Model Aircraft Skypark</span></font><font color="black"><span style><u></u><u></u></span></font></p>
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