[SOLVED] tail wag and rescue to backwards on a Trex 450L

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pabloK
Posts: 56
Joined: Tue 17. Feb 2015 14:42:04

Hi

Tail wag gone. Now is working correct.

But rescue (normal) continues bad, it goes backwards

any other suggestion?
ZeXx86
Site Admin
Posts: 12831
Joined: Mon 29. Apr 2013 16:06:44
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Hi,

great, thanks for info.
If it works backward always, you can check, if the swashplate is level when your collective pitch is at the highest position (full collective).
The best is to measure deviation with a cyclic leveler. Also you can make sure that CG is correct.
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pabloK
Posts: 56
Joined: Tue 17. Feb 2015 14:42:04

before the flight I checked that, and did servo travel adjustments with a leveler at full collective and minimum collective. also at 50% it was correct.
When I land the heli and tried the rescue the swash goes backwards almost at full.

what do you mean about CG ?
ZeXx86
Site Admin
Posts: 12831
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Thanks for the info.

CG - Center of Gravity.

It seems that piro optimization is really reversed. In this case it will affect flight performance too.

There are some videos:
https://youtu.be/lq6QN4rTQ8A?t=1269
https://www.youtube.com/watch?v=4J8BfRXPxu8

It is actually same parameter as in Microbeast:
https://www.youtube.com/watch?v=zZzZFpPFkew
Spirit System developer
pabloK
Posts: 56
Joined: Tue 17. Feb 2015 14:42:04

FLYING GREAT !
RECUE GREAT TOO !
THANK YOU !
pabloK
Posts: 56
Joined: Tue 17. Feb 2015 14:42:04

Hi

I made another analisis with tail blade and the result attached.

can you help me to find the problem?

thanks
Attachments
z_new.png
y_new.png
x_new.png
ZeXx86
Site Admin
Posts: 12831
Joined: Mon 29. Apr 2013 16:06:44
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It seems that vibrations are coming from the tail (the highest spike).
Second, lower spike, is coming probably from the autorotation gear.

This level is very, very high, so I do not recommend to fly with it until resolved.

First from all, if spike is not that high without tail blades, then it is possible that they are unbalanced, or problem is even in tail grips or tail shaft. So I recommend to unmount these parts step by step and check always how it affect vibrations.
If you will notice big difference, then you probably found the problem.
Spirit System developer
pabloK
Posts: 56
Joined: Tue 17. Feb 2015 14:42:04

Hi

I flew the heli with this graphs and for my, flyes Ok, i am not an expert, so maybe is not so good, but I do not know.
Rescue works great too....

the only thing that i need help is in the tail wag at idle up 2 that is 90% flat curve.
In normal and at 75% goes fine, but in 90% start to wag.

thank you
ZeXx86
Site Admin
Posts: 12831
Joined: Mon 29. Apr 2013 16:06:44
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I am afraid, but with 90% vibrations are most probably even higher that it is in mechanical limits of the helicopter to work correctly.
These vibrations may even unscrew all screws, so you have to be very carefull with each flight.
Spirit System developer
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