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Old 04-19-2013, 05:28 PM   #166
MaceH
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Quote: Originally Posted by BarracudaHockey
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It's all in fun.... I have a couple of those I like to keep stashed for special occasions so its hard to pass up when one presents itself.

I do have a miliary electronics background though.... and I always get a chuckle about speculation about radar and such.
My mood is lightened, thanks for the insult. I'm all happy and joyus now. Very helpful.
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Old 04-30-2013, 01:10 PM   #167
Street2strip1320
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What C rating should I use on the receiver for a twin Life battery setup on a 100cc airframe. Digital servos. Is 5c enough? Or is that to low? Also Im curently running 2 lipo's 20c on a resister battery share switch. regulated to 5.8v. on dual Futaba receivers. Whould that setup be better then straight life's?
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Old 04-30-2013, 01:21 PM   #168
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Quote: Originally Posted by Street2strip1320
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What C rating should I use on the receiver for a twin Life battery setup on a 100cc airframe. Digital servos. Is 5c enough? Or is that to low? Also Im curently running 2 lipo's 20c on a resister battery share switch. regulated to 5.8v. on dual Futaba receivers. Whould that setup be better then straight life's?
The C rating depends upon the Capacity of batteries you are using. If you have 2000mah Rx batteries and your servos are drawing 10a, 8C-10C would be safe as they would allow 16-20a continuous. You could even go lower.
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Old 04-30-2013, 01:30 PM   #169
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Ok, Then 5c would be on the low side. The switch I am running now on twin lipo 20c 7.4v is here http://www.chiefaircraft.com/radio-control/power-systems/power-boxes/dur-804000.html I was concerned with it because I held the rutter servos at full through for 10 seconds with the heat gun on the sinks, and it got up to 160 in that time in my 75 degree house. I realize that what the heat sinks are for. But as I have just lost a 100cc airframe on smart fly and dual life I am way over worried.
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Old 05-14-2013, 09:06 PM   #170
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Quote: Originally Posted by Street2strip1320
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Ok, Then 5c would be on the low side. The switch I am running now on twin lipo 20c 7.4v is here http://www.chiefaircraft.com/radio-control/power-systems/power-boxes/dur-804000.html I was concerned with it because I held the rutter servos at full through for 10 seconds with the heat gun on the sinks, and it got up to 160 in that time in my 75 degree house. I realize that what the heat sinks are for. But as I have just lost a 100cc airframe on smart fly and dual life I am way over worried.
It says there, if I read that correctly, is that the switch is rated 5A continuous... barely enough for a 30cc plane... you want at least 4x that on a 100cc plane imo.

Smartfly (some of them... methinks the one you should want) have a soft switch capability- the switch handles none of the load. Otherwise check out Wolverine, rated at 32A continuous, its mosfets will do 4x that intermittent.

Beware that as temperature goes up, current carrying of semiconductors goes down, and few are rated for use above 75c, so whatever the ambient spec current, zero amps at 75*C.
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