help

[Fixer]

Are you flying near any overhead power lines, I have the same problem if I fly near my home, but when I fly at the local club everything is OK.

[Dedcalm]

metal on metal causes elctrical noise which can affect Rx's.

You say "The same thing happened but on the first tank , I lowered it from hover and it sat there revving quite high and lost all radio control." If your fail safe is set correctly it should set the engine to idle so you engine should not be revving quite high with no control.

Do you regain control after a second or so ? If not I would check all links between the Rx pack and the Rx (i.e. the switch) as this may be faulty. Remember that no failsafe can move a throttle to idle if there is no power to the servo/Rx. I would re-check all wiring for damage and good contact. Some people remove the switch altogether and use the battery connections as the switch (especially in high power applications).

I would recommend the Rx pack be cycled on a decent charger to ascertain whether it is holding a charge etc.

Rob

[Steve]

Stan

You're probably not charging the pack for long enough with that charger. The charger that came with the radio will be matched to the battery that came with the gear - probably a 600 mAh or similar. The charger will therefore charge at about 60 mA. So in order to get 600 mAh into a flat 600mAh pack, you'll have to charge for 10 hours.

You've now got a 2000 mAh pack. So at a charge rate of 60 mA, it will take 33 hours to fill your Rx battery to 2000 mAh! (i.e. the number of hours = battery pack size divided by charge current = 2000 / 60 = 33.3 hours)

So, the answer my friend is to get a new charger that either charges your packs at whatever current you want (you should aim to trickle charge at 10% of the battery size i.e. your 2000 mAh pack should be trickle charged at 200 mA) and/or fast charges with an automatic cut off when the pack is full.

If you've been charging the 1100 mAh or 2000 mAh packs over night with that charger (say 10 hours ish), it's been no way near long enough, so you've been going flying with a flat Rx battery.

I hope this all makes sense.

[stan]

Thanks for your suggestions
Going on holls for the next week but will try a new batt charger when i get back.
will keep you all posted .

(oh and no power lines and i like the idea about removing the batt switch )

[kluson]

Hi Stan,
I'm not a helicopter expert but i do work in the electronics industry. The use of battery voltage checkers with NiMh is useless, NiCad will see its voltage fall off slowly. NiMh will be up one second and gone the next.The curve is very steep, Nicad is much softer. E.G. the meter will show good when at the first sign of any load it will just plummet. There are of course advantages too. NiMh has no memory, but doesn't really like a real fast hard charge. All
bateries prefer a trickle charge but fast charging will work, it just shortens the life.
I would go for NiMh, but get at least 2100, get yourself one or two and a field charger may be useful

[Steve]

Thanks kluson, I think that's sort of what I said earlier about the torches, without being an electronics expert!

[stan]

Have removed the switch changed the batt to a 2000mah and bought a better charger . All seems to be ok.
Thanks a million for all your help (time to get flying again)

[col9]

Wrong thread, please delete and sorry.
Col.