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<DIV><FONT face=Arial size=2>Richard</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Tell Orland "hello" from me.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>How much do your 3200 packs weigh? </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Earl</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=richard.s@allied-callaway.com
href="mailto:richard.s@allied-callaway.com">Richard Strickland</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, January 21, 2006 12:23
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] E
Stuff</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>After Orland and I went through a steep learning
curve at the beginning last year, the whole set-up became VERY reliable.
Hacker geared motors, Hacker controllers, 22/12 props and Kokam 3200 20c
batteries. As it turned out, the airplanes were pulling around 65 amps
at full throttle and the batteries were not happy for longevity much over
10c. I sort of re-grouped when all three sets of batteries
called it a day after about 25 cycles ea. set--decided that I'd wait until the
technology caught up. The old Jag('68 2+2)(2m will just fit) we've
been madly restoring is about under control and I'm about to get
back in the fray--so I'll be casting around for a battery set-up. Castle
Creations(local) sent me a controller to try and I may whip something up for
that. Unfortunately, both the airplanes I've got are a little heavy that
anything over the 3200s will put 'em over the limit. I may not sweat
that for now as I'm probably not going to hit any big-time contests this
year. As I've said before--everything seems pretty reliable at this
point--except battery life. Weight certainly affects amp draw which
affects battery life--so if we have to live with existing technology--then
that is the first place to look. I could be wrong, but I have the
feeling some folks have about 5 sets(or more) and one or two are in
transit to and from the manufacturers supporting them during the heavy contest
season. If you've got deep pockets(or are sponsored)--that's cool--for
the rest of us; either the batteries have got to come along, or we build
lighter, change our flying approach--or all of the above to extend battery
life. I am NOT bashing Kokam--they are great folks and they were
learning right along with us. I'll be talking to them first. I may
chat with Tanic since they are local. We'll see.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Richard</FONT> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=ehaury@houston.rr.com href="mailto:ehaury@houston.rr.com">Earl
Haury</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">Discussion List, NSRCA</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, January 21, 2006 11:02
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [NSRCA-discussion] E
Stuff</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>The E info on the list has been scant. Probably
some are reluctant to hype / criticize products because of their involvement
with suppliers. Some of us are just blindly exploring options, gathering
data / information, and forming opinions without experience to back up our
conclusions. </FONT><FONT face=Arial size=2>Certainly information offered by
those with experience is very welcome and appreciated. Those who are
qualified experts in the various fields that can correct / clarify
information gained through the school of hard knocks are not only welcome,
but I suspect somewhat obligated to protect the rest of us. As this entire
topic expands there will be conflicting opinions which in themselves provide
info - that's what this list is for and no one should take offense
that some prefer other views.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>After teasing the E guys at the Nats I
recognized that the E powered airplanes flew better (I'll admit to being
obstinate - but not totally dumb). There were also differences that seemed
related more to E equipment choices than differences in pilot skills. The
info published by Jason, Frack, Adam, Chad, and others (in RCU forums)
provided an insight to the various equipment choices (and passionate defense
of same in some cases). Interestingly, a lot of the discussions revolve
around equipment type rather than the effect on flight
characteristics.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>So - I set about trying to determine if E flies
better and why. So far the answer is yes and I'm not sure. While differences
in dynamics can be identified, it's hard to quantify the effects. For
example, the lighter / slower rotating E prop generates a lower gyroscopic
precession force during looping maneuvers than glow - this also suggests the
lower rotating mass of a geared motor might be better. The lighter motor
(compared to glow engine) up front can result in a lower
pitch moment of inertia if the tail is light enough to allow the battery
mass to be close to the CG. Airplane smoothness in rough air is markedly
better with E. (I did most of my comparisons with twin Partners - one glow
and one E - at about the same flight weight.) This may be an effect of
the large diameter prop or lack of vibration effect on the servos. As others
have noted, thrust application is very good with E as the slower prop is
efficient and the motor is instantly responsive and very linear. E can be
flown slower than or as fast as glow, the airplane is more stable with
E when slow - again probably the large prop effect. Overall, it's
easier to fly well with E but E won't fix sloppy flying.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>As with most things in model aviation - there
are learning curves. Some suppliers are better than others, some equipment
is better than others, some choices will be revisited after experience is
gained. The hardest thing to get used to is the metrification of cost - kilo
dollars. Not that E is that much more expensive than glow - just that very
little from glow is useable with E. That means one must acquire motors,
controllers, batteries, chargers, power supplies, meters, connectors,
wire, props, etc. pretty much from scratch.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>If there's interest in this becoming a thread
I'll discuss the reasons for some of my choices of equipment and the data
I've generated / will generate with the full understanding that I might be
operating under false assumptions and some of this stuff will change - I'm
still learning.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Earl</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
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