11t and 4000kv tail sliding out

[butmuncher]

Hi,
Am using a futaba gy401 with a dys9527 clone servo and the tail was shooting round on punchouts.
Changing my throttle curve to 0-40-65-90-100 solved the issue mostly, tail slide was minumal doing 100% punchouts so i take it there was'nt enough speed for the tail to hold.
i have some 13t pinions but i do'nt want to have to locktight everything in again just to find 13t is too much.
Would i see a major rpm increase going from a 11t to a 13t bearing in mind a 11t won't hold the tail?
If so i'll order some 12t.

[Farmer Giles]

With a small electric I would flatten out the top end of your throttle curve so when you're flying the gyro only has to cope with pitch increases and not pitch and throttle increases.

For example the throttle curve I have on my Trex 500 is

NORM : 0, 50, 100, 100, 100
IDLE 1 : 100, 100, 100, 100, 100.

so once I am into the hover on normal mode the throttle remains at 100% flat.

You may find the ESC runs cooler as well as they are more efficient at 100% throttle because they are not having to regulate the power to the motor.

As for your pinion I would run the 11t at 100% throttle to start with as that will be faster anyway over your current settings as see how you get on. Just be aware of you're flight time as they may change with the higher throttle and also the heli will be more responsive with the higher head speed but conversly it should be more stable...

HTH..

[squeaky pete]

11t and 4000kv tail sliding out

Run a flat line, its the torque making it kick

[Gav]

yeah get that throttle constant. Also I dont think a 13T would be good on a 4000kv motor - it will want to explode appart when full bore .

if the ball on the tail servo arm is too close to the servo - whip around can also happen, as I found. But only on inverted climbs, after a couple of seconds climbing max neggy pitch mine used to do it. moved the ball out a bit and never had the prob again.

[butmuncher]

Thanks for the info there guys.
Tail servo is'nt the best but the slide has gone after upping the throttle curve.

[butmuncher]

Just alittle update.
After upping the throttle curve abit more tail slide has gone completely.
The cheap dys9257 clone works wonders for £10, can't tell the difference now between that and my old futaba 9257 at 5 times the price.

[Farmer Giles]

good news mate...