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Other › Trex goes into low battery behaviour.
02-11-2006 08:54 AM  12 years agoPost 1
Trevor G

rrApprentice

Brisbane, Australia

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After weeks of nothing but problems with my new Trex I finally got the balance between blades and pinion size right so the speed control didn`t overheat and shutdown. I had about 20 flights on it and now after three days of just sitting on a shelf as it was too windy to fly, it hovers for about 45 seconds and the power just trickles down like the battery is going flat??????????????????
Must say that I have never owned a model of any description that was a much trouble as this Trex. It has been nothing but a nightmare from day one and nothing to do with the mechanics. Always speed controller/motor troubles, apparently due to current draw. The battery packs have never given a problem either. I run an align 420l motor through an align 35amp speed control, powered by a model engines, awesome power, 11.1Volt, 2200 milliamp pack. Does anyone have any ideas out there as to what this one is about? The motor just looses power smoothly, no sputtering or anything.
After a 30 second break it hovers another 15 seconds before doing it again.

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02-11-2006 09:05 AM  12 years agoPost 2
TRex888

rrVeteran

Monmouth, UK

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I use the 420L, 35A ESC and 1800mAH cheap LiPos.

What pinon you using? I use the 13T and everything including motor, ESC and battery runs cool. I had overheating problems when I used the 15T.

Also, try using the woodies instead of plastic blades, they're lighter.

Ensure you have enough rpm against pitch. At hovering I'm running 85% throttle and 5-6 degrees of pitch.

I suspect you LiPo may be damage. You should get 8-10 mins flying with your battery and have a resting voltage of +11V afterwards. Get a LiPo alarm it will save you $$$$ and show up any set-up issues due to excessive current draw.

Make sure nothing binds. Rotating the main rotors by hand should give you 3-4 revolutions.

Make sure the mast collar ring isn't set too low or else the main rotor will not turn freely.

Make sure tail belt is fairly loose and can almost touch (user guide says 3/4 way).

Check gear mesh.

Check no binding anywhere! Loctite can creep into places you don't want to if used too much.

Loosen up screws slightly if things seems binding.

That's fairly much covers the problems I've had.

I guess I'm fairly lucky. This was my first RC build of anything and have managed to get it into the air and have had 5 months of flying with it.

Good luck.

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02-11-2006 11:52 AM  12 years agoPost 3
noitall

rrNovice

Tampa Fl

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I had similar problems. Turned out to be li-po problems. Try a new battery, or possibly your charger is not charging properly.

Jeff

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02-12-2006 12:02 AM  12 years agoPost 4
Trevor G

rrApprentice

Brisbane, Australia

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Thanks for the replies people!
I`m using an 11 tooth pinion and woodies - the only combo that doesn`t makemy esc overheat and shut down. Air frame and mechanics are just beautiful and smooth, no binding.
How likely is it that 2 lipos sitting charged in the cupboard for three days both develop an imbalance in cell voltage together...maybe I got females! hahahaha. It`s no more likely that the esc went bung on me in storage. It all ran fine last flight and nothing has been changed. I`ll run a voltmeter over the three cells in each pack and check for an imbalance. I use a swallow charger that peaks at 12.599 volts for an 11.1 pack. but there`s been no problem before.
Any body know of a glow conversion for Trex??? an 049 perhaps. Then i could turn the carbon blades I have for it.

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02-12-2006 01:32 AM  12 years agoPost 5
Trevor G

rrApprentice

Brisbane, Australia

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I just checked the lipos and each cell is within .01 of a volt on each pack. Think I`ll ditch the align 35amp esc and motor for something else. Maybe a cc esc.

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02-12-2006 01:59 AM  12 years agoPost 6
noitall

rrNovice

Tampa Fl

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I have two CC35 and the Castle link. You can keep your ESC data updated and the program is very easy. I have 2 T-REX's both in govenor mode.
Works like a dream. Keeps the head speed constant.
ni 0-80-80-80-80
iu1 85-85-85-85-85

Jeff

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