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You articulated this much better than I did. Thank you.<!--owa-remove-on-send-start--></div>
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I found that Life batteries eliminated the need/cost for regulators and were generally considered safe to charge in the airplane. You just have to be careful to charge them as LiFe batteries NOT as LiPos.<br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> NSRCA-discussion <nsrca-discussion-bounces@lists.nsrca.org> on behalf of John Pavlick via NSRCA-discussion <nsrca-discussion@lists.nsrca.org><br>
<b>Sent:</b> Friday, March 27, 2020 2:20 PM<br>
<b>To:</b> 'General pattern discussion' <nsrca-discussion@lists.nsrca.org><br>
<b>Subject:</b> Re: [NSRCA-discussion] Digital and analog servos on sport plane</font>
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Sorry to hear that you had to learn this the hard way. To be clear it’s not that NiCads themselves are bad or inferior in any way. In fact there are plenty of NiCad batteries that could easily provide power for multiple digital servos. The problem is that the
NiCads that we typically use in model airplanes are of the “high-capacity” variety, NOT the “high-current” variety. Although all NiCads have the same output voltage, they don’t all have the same output current capability. We typically use 700mAh – 1000 mAh
NiCads in 60-size and smaller sport airplanes. Even the 1000 mAh cells could create the conditions that Robert described. It’s because the “high-capacity” variety usually have higher internal resistance. Anyone who flies electric Pattern knows what this means:
they can’t deliver their rated output voltage at high current levels. The servos want what they want, when they want it. If the current demand is high and the resistance is high as well, the voltage will sag.</p>
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There are plenty of good batteries available that will be able to provide enough current to feed the digital servos. I was using dual 900 mAh LiPos with 2 TechAero regulators in my glow Pattern planes. This setup is light and it gives you redundancy: if one
pack fails for any reason you can still fly. </p>
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Just do your research before you risk your airplane.</p>
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John Pavlick</p>
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Cell: 203-417-4971</p>
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<span style="font-size:10.0pt; font-family:"Impact",sans-serif">Integrated Development Services</span><span style="font-size:10.0pt"></span></p>
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<b>From:</b> NSRCA-discussion <nsrca-discussion-bounces@lists.nsrca.org> <b>On Behalf Of
</b>ROBERT SOX via NSRCA-discussion<br>
<b>Sent:</b> Friday, March 27, 2020 2:45 PM<br>
<b>To:</b> chuenkan@comcast.net; General pattern discussion <nsrca-discussion@lists.nsrca.org><br>
<b>Subject:</b> Re: [NSRCA-discussion] Digital and analog servos on sport plane</p>
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<span style="font-size:12.0pt; color:black">I normally just watch the conversations, but fell compelled to reply to this one.</span></p>
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<span style="font-size:12.0pt; color:black">When the 2.4 radios first came out, I was an early adopter. I bought the DX7 "package" that came with radio, servos, receiver,
<b>NiCd</b> battery, and switch. I built two airplanes that winter with that technology.</span></p>
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<span style="font-size:12.0pt; color:black">When I started flying that spring, I was very careful about monitoring the battery using an "old school" expanded volt meter after each flight. I lost both airplanes a week apart under suspicious circumstances.
During the third flight of each airplane, the receiver apparently browned out during the down side of a loop. I had just regained control of the airplane before it pancaked into the ground at full speed. 3.5 seconds is a long time when the airplane is pointed
straight down at the ground at full throttle. </span></p>
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<span style="font-size:12.0pt; color:black">The day after the second crash I found an article that discussed how much current a digital servo could draw. I had 4 of them in that airplane. So I set up a simulated environment on my kitchen table with the four
servos, the two batteries from my crashed airplane, and a volt watch plugged into the receiver. Fresh off the charger everything was fine. Using the battery from the last crash (without charging) it still read OK on the volt meter, but went into Red zone
on the volt when the sticks were stirred. VERY expensive lesson learned - a "normal size" Nickle battery could not supply the necessary current required by digital servos. Within two weeks of my crashes warnings started appearing on all the on-line websites
warning about current draw with digital servos and advising against Nickel battery technology with their use.</span></p>
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<span style="font-size:12.0pt; color:black">I started buying LiFe batteries to use for flight packs, initially using Black&Decker VPX power tool packs with an adapted harness and heavy duty (with larger gauge wires) switches. End of problems and the additional
advantage that you didn't need to charge the night before you wanted to go fly. When the airplanes came out of the truck they went right onto the charger. And the batteries held 95% charge for months. What was not to like about this chemistry?</span></p>
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<span style="font-size:12.0pt; color:black">In today's world, the price of a quality LiFe packs are the same as a Nickle pack or less. They're about the same size and weight. And if you're flying electric and have any kind of modern advanced charger, you
are already the setup to handle this chemistry. If you're not familiar, investigate the Turnigy Nano-tech line of LiFe batteries as a starting point. The connectors are a JR/Hitec style plug so they are pretty universal. Don't forget the Heavy Duty switch
- I've been using the Mpi MAXX PRODUCTS line because they offered a version that had Deans connectors, but also have a JR/Hitec version.</span></p>
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<span style="font-size:12.0pt; color:black">With a single digital servo you might avoid the problems I experienced. However, unless you're using servos that will not tolerate 6.0 volts (and you already said you're using a 5 cell pack pack) everything should
plug right in and work. New technologies are always a bit mysterious and intimidating. This one has been a real positive for me.
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<span style="font-size:12.0pt; color:black">I started using the VPS packs which lasted for 5 - 7 years. When Hobbico got into the business of LiFe packs, I jumped on those instead because they were already to go (no wiring harness build needed). They worked
well with most lasting 4+ years. Sadly that production has ended, but others picked up the slack. I'm using the Nano-tech and NOS Hobbico LiFe batteries on all my planes now. I always cycle the pack 3 - 5 times before putting it in service. If it doesn't
measure up, it gets relegated to desk-top duty. Sadly, the new production stuff doesn't have quite the quality materials that the old stuff did. I buy 3 to 5 at a time so I always have a replacement and cycle test my current fleet every year and a specific
airplane when necessary if the replaced milliamps seems suspicious after charging.</span></p>
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<span style="font-size:12.0pt; color:black">Your mileage may vary. Hope this was helpful.</span></p>
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<span style="font-size:12.0pt; color:black">Robert</span></p>
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<b><span style="color:black">From:</span></b><span style="color:black"> NSRCA-discussion <<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org">nsrca-discussion-bounces@lists.nsrca.org</a>> on behalf of Phil Spelt via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br>
<b>Sent:</b> Friday, March 27, 2020 7:51 AM<br>
<b>To:</b> John Pavlick <<a href="mailto:jpavlick@idseng.com">jpavlick@idseng.com</a>>; General pattern discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br>
<b>Subject:</b> Re: [NSRCA-discussion] Digital and analog servos on sport plane</span>
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<span style="font-size:12.0pt; font-family:"Helvetica",sans-serif; color:#333333">Right you are, John. I forgot that little detail. I always use 6-volt Rx packs, anyway, so as long as I monitor pack capacity during a long flying day, current draw is not a
problem. </span></p>
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<em><b><span style="font-size:9.0pt; font-family:"Arial Black",sans-serif; color:#333333">Phil Spelt, AMA 1294, Scientific Leader Member</span></b></em><b><i><span style="font-size:9.0pt; font-family:"Arial Black",sans-serif; color:#333333"><br>
<em><span style="font-family:"Arial Black",sans-serif">SPA L-18, Board Member, NSRCA 2032, KCRC Emeritus</span></em><br>
<em><span style="font-family:"Arial Black",sans-serif">Knoxville, TN 37931 (865) 604-0541c</span></em></span></i></b><span style="font-size:12.0pt; font-family:"Helvetica",sans-serif; color:#333333"></span></p>
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On March 27, 2020 at 8:51 AM John Pavlick via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>> wrote:
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Mike,</p>
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Make sure that your airborne batteries or the BEC in your speed controller are capable of delivering sufficient current. Digital servos can draw a lot more current than analog servos!</p>
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John Pavlick</p>
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Cell: 203-417-4971</p>
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<strong><span style="font-family:"Calibri",sans-serif">From:</span></strong> NSRCA-discussion <<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org">nsrca-discussion-bounces@lists.nsrca.org</a>>
<strong><span style="font-family:"Calibri",sans-serif">On Behalf Of </span></strong>Phil Spelt via NSRCA-discussion<br>
<strong><span style="font-family:"Calibri",sans-serif">Sent:</span></strong> Thursday, March 26, 2020 6:36 PM<br>
<strong><span style="font-family:"Calibri",sans-serif">To:</span></strong> Michael Cohen <<a href="mailto:precisionaero@hotmail.com">precisionaero@hotmail.com</a>>; General pattern discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br>
<strong><span style="font-family:"Calibri",sans-serif">Subject:</span></strong> Re: [NSRCA-discussion] Digital and analog servos on sport plane</p>
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<span style="font-size:12.0pt; font-family:"Helvetica",sans-serif; color:#333333">Hey, Mike,
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<span style="font-size:12.0pt; font-family:"Helvetica",sans-serif; color:#333333">I don't know about Airtronics, but the Spektrum radios I fly (DX-9 and iX12) are capable of two frame rates -- 22 msc and 11 msc. In order to use the faster frame rate, you need
all digital servos, as the analog can't follow the faster frame rate. If your Tx works the current analog servos, I don't think you will find any electronic issues, as the digital servos are equally capable of following the slower frame rate. The pulse
widths and voltage changes to create the pulses are well-standardized, these days. Whether you would experience any "flying feeling" differences between functions with and without digital servos, I don't know.
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<span style="font-size:12.0pt; font-family:"Helvetica",sans-serif; color:#333333">What functions are you ging to use digital servos for, and why? Just curious...
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<strong><i><span style="font-size:9.0pt; font-family:"Arial Black",sans-serif; color:#333333">Phil Spelt, AMA 1294, Scientific Leader Member</span></i></strong></p>
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<strong><i><span style="font-size:9.0pt; font-family:"Arial Black",sans-serif; color:#333333">SPA L-18, Board Member, NSRCA 2032, KCRC Emeritus</span></i></strong><b><i><span style="font-size:9.0pt; font-family:"Arial Black",sans-serif; color:#333333"><br>
<em><span style="font-family:"Arial Black",sans-serif">Knoxville, TN 37931 (865) 604-0541c</span></em></span></i></b></p>
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On March 26, 2020 at 6:23 PM Michael Cohen via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>> wrote:</p>
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Hope everyone out there is COVID-19 free and using this time to build or fly, with social separation, if the weather is nice enough.</p>
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I have a sport plane where I want to put a digital servo in with the inexpensive analog ones the plane came with. Any know issues with such a setup? This will be with an Airtronics radio, if that makes a difference. </p>
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Be safe!</p>
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Mike Cohen</p>
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Sent from <a href="https://go.microsoft.com/fwlink/?LinkId=550986">Mail</a> for Windows 10</p>
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