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Old 05-16-2011, 09:31 AM   #1
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What is recommended to achieve this the best possible way? I would like to use 2 life batteries so i will need a regulator of some sort. I've looked at mpi and smart fly. Looking for some recommendations. Installing in a 50cc plane.
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Old 05-16-2011, 10:57 AM   #2
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Re: redundancy

I personally think the best system for various reasons is JR/Spektrum power safe RX's, come with two battery inputs and a fail safe switch. Nothing as simple to install and use. As long as your servos can handle 6v, I run 2 x life04 packs straight in, no regulators, no extra switches, no fuss. The RX is expensive when compared to others 9ch for $180, but when you start adding smartfly set ups, or dual switches, regulators will cost you the same if not more.

I use the Hyperion 2100mah 5c Life04 RX packs @ $28 each and under 100g each). The RX can handle the voltage no problem and up to 20AMPS which you will never see unless you are running one huge mother of a set up in a very large plane.

Works flawlessly for me and you can leave it plugged in all day at the field in between flights, no need to unplug. But unplug before you go home and store as it will drain the battery slowly over time. Also if your servos can handle High Voltage 7-8v you run 2 x 2s lipos if you have them.

Just an FYI I also run an Ignition Battery Eliminator straight into the RX so those two life04 packs run the RX and ignition. I was skeptical at first but I have had no issues. Simple light and redundant enough for me.

This is a neat looking product too for those not running power safe RX set ups but running A123 or Life04...have not seen any feedback but looks neat.
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Old 05-16-2011, 02:57 PM   #3
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Re: redundancy

This is the set up I'm installing in a 40% Waco.

2x JR 921 Rx (using them because I already had them)
The 921 has 2 batt. ports so each port has a A123 2300 on it's own switch, 4600ma. per RX.
The top wing and one elevator half, throttle and rudder on one rx. the rest on the other.
Ign. and electric fuel pump (for the Moki 400) through a 5.2v reg...2x A123 2300 packs.

Each 921 has 2 rx. built in, plus two remotes' gives 4 rx's per side. (lots of coverage)
Servos...4-7955 tg on ails, 2 on ele. 7980th on rudder etc.

Overkill???...perhaps, but when dealing with a 75lb.+ a/craft (not to mention the $$$ tied up in it) I want to leave nothing to chance. The equipment can be replaced, but hurting (or worse) somebody is NOT an option.

I like to say, I would rather crash with some dignity rather than driving it straight into the dirt!
Dave Collis
Pitt Meadows B.C.
maac 37241
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