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Post  mail4dean@aol.com Thu May 25, 2023 9:51 pm

Looking for information on what we're using now for light RX packs in our small glow powered planes. LIPO W/bec? Tips on were to buy?
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Post  balogh Fri May 26, 2023 12:04 am

Welcome to the CEF

I use 1/3AAA Ni Mh 4.8V accu pack for my smallest, COX TeeDee010 engine powered RC planes.
https://www.ebay.com/itm/122165361905?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=h2N0B68PQuS&sssrc=2349624&ssuid=rP7YBAVdSR2&var=&widget_ver=artemis&media=COPY

I buy them on ebay.
The pack weighs around 15 gramms.

2cell LiPo packs at 7.2V would be lighter with a step-down  voltage controller, but the controller also adds weight.

My larger, TeeDee 020 size engines drive  planes that  run on the same NiMh 4.8V  but made of 2/3AAAsize batteries.
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Post  Ada99 Fri May 26, 2023 2:54 am

As well as the small “Vapex” receiver packs, I also use high voltage receivers/servos with an unregulated 2S Lipo.

=Adrian=
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Post  balogh Fri May 26, 2023 8:52 am

Ada99 wrote:As well as the small “Vapex” receiver packs, I also use high voltage receivers/servos with an unregulated 2S Lipo.

=Adrian=

Is the voltage of unregulated 2S LiPo not too high for the receiver and servos that typically work at ~6Volts max?
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Post  GallopingGhostler Fri May 26, 2023 10:26 am

balogh wrote:
Ada99 wrote:As well as the small “Vapex” receiver packs, I also use high voltage receivers/servos with an unregulated 2S Lipo.
=Adrian=
Is the voltage of unregulated 2S LiPo not too high for the receiver and servos that typically work at ~6Volts max?
Because of the possibility that the 7.6 Volt output of the 2S may damage the sensitive receiver and servo electronics that are not rated for such (old analog discrete electronics of the 1950's - 1970's without IC's were more tolerant), some form of voltage regulation would be required.

In the past, I used a zener diode and resistor network to provide such simple regulation. Resistor would limit current and a 6.0 V zener would shunt excessive voltage to ground. It worked like a charm on a milliammeter that I used as an ESV - expanded scale voltmeter for my Ace R/C Pulse Commander transmitter. With a new 9 V dry cell battery (an old brick about 1/3rd the size of a 6 V lattern battery), with a new battery it would show full scale. At below 7 volts, it would show 0 V.

The zener is installed backwards to a normal diode. If installed the other way, it acts as a "short". Since it would provide a constant current drain, one would need to calculate what worst case current draw is for the receiver plus servos. But I leave this as an academic consideration, as it is another possibility to be explored, might be OK given the higher capacity of the 2S pack versus NiMh battery packs.

For me, NiMh provides a simpler solution, since I don't fly indoor ultra lightweights.
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Post  Ada99 Fri May 26, 2023 12:25 pm

balogh wrote:
Ada99 wrote:As well as the small “Vapex” receiver packs, I also use high voltage receivers/servos with an unregulated 2S Lipo.

=Adrian=

Is the voltage of unregulated 2S LiPo not too high for the receiver and servos that typically work at ~6Volts max?

Yes - but receivers and servos are available that can cope with 2S lipo. I’m currenlty using Frsky TFR4 4.6g receivers (max 10v), Blue Bird BMS-101HV 4.4g servos (max 8.4v), SD100 4.7g servos (max 9.6v).

=Adrian=
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Post  mail4dean@aol.com Fri May 26, 2023 2:32 pm

My Radiolink gear is 6vlt max. I found these:
https://www.amazon.com/gp/aw/d/B09WKCBXKK/ref=ox_sc_act_image_1?smid=A2XZ0PQGR3TYBH&psc=1

$6.00 ea @ 11 grams
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Post  GallopingGhostler Fri May 26, 2023 2:46 pm

Ada99 wrote:
balogh wrote:
Ada99 wrote:As well as the small “Vapex” receiver packs, I also use high voltage receivers/servos with an unregulated 2S Lipo.
Is the voltage of unregulated 2S LiPo not too high for the receiver and servos that typically work at ~6Volts max?
Yes - but receivers and servos are available that can cope with 2S lipo. I’m currenlty using Frsky TFR4 4.6g receivers (max 10v), Blue Bird BMS-101HV 4.4g servos (max 8.4v), SD100 4.7g servos (max 9.6v). =Adrian=
This is good to know, Adrian. I have older radios that lack that tolerance. However I have a bit of reluctance in any new R/C investments, seeing that the US FAA is requiring transponder equipment next Fall, above and beyond what other nations are doing. Further discussion would be better a separate thread, but my current sentiments for focus on C/L and F/F.
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Post  crankbndr Fri May 26, 2023 3:01 pm

Your post about new drone rules had me do a search. Wow, how's that boot feel on your neck comrade?
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Post  balogh Fri May 26, 2023 3:43 pm

Strange, but in the EU so far the internal combustion engine powered "drones" like my beloved COX powered RC planes are not yet classified in the main C0.....C3 drone classes, that are all electric powered and some need to be equipped with tranponders and gadgetry.

IC engine powered drones are expected to fall in C4 which at the moment has a very loose definition and no transponders are specified as mandatory accessories.

Check whether the FAA rules in the US are equally slack in defining the IC engine powered drones...you may even be pleasantly surprised as I was.. Huh...
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Post  GallopingGhostler Fri May 26, 2023 6:30 pm

András, so that we do not drift too far off topic, I have moved replies regarding US drone legislation to:
https://www.coxengineforum.com/t17321-faa-proposed-model-aircraft-id-transponders#224326 sunny Hand Shake I Love This Forum!

(Sorry! Devil It was I that started the off-topic drift. Doh! ) lol!
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Post  rdw777 Fri May 26, 2023 9:57 pm

I’ve had good luck with using these 5 V regulators in a couple of planes now…. I use 2S lipo for main power…. The regulator is small and barely a bump in the wire …soldered directly into the switch harness…

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Post  NEW222 Mon May 29, 2023 9:54 pm

For my small one, I use a Spektrum 300 mAh Life battery pack.
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