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Old 08-19-2017, 03:42 PM   #1 (permalink)
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Default V2 elevator bounce

I have a vario scale helicopter with a 4 bladed head and 765mm blades. The heli is around 25 lbs. The elevator has a bounce when I stab the cyclic stick in a hover.

In the manual it says to lower the E stop tune to reduce bounce but I think that's not correct. Can anyone verify this?
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Old 08-20-2017, 03:43 PM   #2 (permalink)
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You can try slowly increasing ELE. Comp in the Flight Tuning menu. Perhaps in conjunction with E stop.
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Old 08-20-2017, 03:50 PM   #3 (permalink)
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I'm still working on an issue with my Rex 800. When I do rapid pitch pumps the tail lags behind a little. So I'm trying the aforementioned tuning. Increasing the E. Comp has helped some, but I'll try and decrease the E. stop as well to see if combined I can dial the tail lag out.
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Old 08-22-2017, 08:43 PM   #4 (permalink)
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Quote:
Originally Posted by garyl View Post
I have a vario scale helicopter with a 4 bladed head and 765mm blades. The heli is around 25 lbs. The elevator has a bounce when I stab the cyclic stick in a hover.

In the manual it says to lower the E stop tune to reduce bounce but I think that's not correct. Can anyone verify this?
"Cyclic stop tuning on the elevator axis. If the helicopter after an elevator flip continues to coast,
lowering the “StopTune” will create a harder stop action to remove the coasting. If the helicopter
bounces on the elevator axis after an elevator control input, increasing the “StpTuneE” will reduce
bounce."


Increase the StopTune to reduce bounce.
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Old 08-22-2017, 09:00 PM   #5 (permalink)
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Quote:
Originally Posted by shawnlh View Post
You can try slowly increasing ELE. Comp in the Flight Tuning menu. Perhaps in conjunction with E stop.
Quote:
Originally Posted by shawnlh View Post
I'm still working on an issue with my Rex 800. When I do rapid pitch pumps the tail lags behind a little. So I'm trying the aforementioned tuning. Increasing the E. Comp has helped some, but I'll try and decrease the E. stop as well to see if combined I can dial the tail lag out.
Slow the pitch pumps down and look at the whole heli in relation to the field. When climbing is the heli lifting the nose and going a bit backwards, and during descent dropping the nose and going a bit forward. I aim to get the heli to appear it is locked in place and climbing and descending on a pole. Try both left and right side in to make sure it is the heli and not the wind and consistent in both directions. Double check your CoG, and adjust the ELE.Comp accordingly.
Lastly what servos do you have in your Trex 800, and what is the "SpeedCmp" set at?
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Old 08-27-2017, 04:23 PM   #6 (permalink)
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Default I figured out how to tune it out.

The Vario rotor head and blades are very rigid with no dampening. The blades have two blade bolts each so no lead lag at all. In the flight tune expert menu I adjusted head hold elevator down to 55% and the Stop tune Elevator up to 115%. This has pretty much eliminated the elevator bounce and the helicopter still feels locked in.
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