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Revolution Models . CarbonXtreme . Midland Helicopters

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Avant Aurora - EFX - FX > Avant head problems
 
 
Henrik Engert
Key Veteran
Location: Cedar Park, TX

Hi,

First I must say this Avant head is really nicelly made. Great quality etc. But, me and a friend have a major problem with this head. We have followed the manual, and we have picked about zero delta.

We use heavy Hirobo paddles.

Problem is that if the helicopter is facing into the wind, the helicopter wants to go backwards. But, the strange things is, if you turn the helicopter facing away from the wind, the helicopter want to quickly go to its right. The head works when there is no wind. Also when we do FF, the helicopter wants to tip backwards.

Other than these problems, the head is really good.

What could be wrong? It seems like the flybar does not have as much power as before. But the strange things is that helicopter want to go to its right when facing away from teh wind.
06-11-2006 Over year old.
 
 
rdalcanto
Key Veteran
Location: Salt Lake City, UT

I don't have one, but it sounds like you have a paddle alignment problem, CG problem, phasing problem, or a combination of the three.

Rick

Team MRC & Magnum Fuels
06-11-2006 Over year old.
HOMEPAGE  
 
 
Henrik Engert
Key Veteran
Location: Cedar Park, TX

The paddle alignment seems fine. We have adjusted them in different ways with no effect. We both have the same problem. The C.G is fine, it is little bit nose heavy which is what I want. Phasing problem? The phasing should only be touched when rolling, or am I wrong?
06-11-2006 Over year old.
 
 
carcrasher
Key Veteran
Location: east coast

it could be an interaction issue.
06-12-2006 Over year old.
 
 
jbiter
Veteran
Location: Orlando, FL

Are you running the programmable head or is this a stock FX? I'm guessing on your Avant model from your profile. Was this Avant created from your XSpec?

I don't have any experience with the programmable head but if this is the X-Spec head make sure you used the long flybar and you might try removing the lead from your paddles. I fly mine with brass only as the manual suggests as a starting point.

Jeff
06-12-2006 Over year old.
 
 
Henrik Engert
Key Veteran
Location: Cedar Park, TX

It's the Avant programmable head. It is mounted on a XSpec. XSpec is just a beefed up Freya, so the Avant head is made for it. The XSpec is used for FAI, that's why it is crusual to get the hovering working. But even if I was flying 3D style I would not accept this behaviour. It must just be a basic setting we have missed.
06-12-2006 Over year old.
 
 
jbiter
Veteran
Location: Orlando, FL

Have you tried lightening the paddles? Still sounds like that may be the problem.

Sorry, I don't have much to go on as my Avant still has the stock Hirobo head.

Jeff
06-12-2006 Over year old.
 
 
jbiter
Veteran
Location: Orlando, FL

Also, did you install the 555 flybar when you built this head? It is longer than stock X-Spec.

Jeff
06-12-2006 Over year old.
 
 
Henrik Engert
Key Veteran
Location: Cedar Park, TX

The XSpec comes with the long 555mm flybar.

I took out the brass weights from the paddles, no difference.
06-12-2006 Over year old.
 
 
jbiter
Veteran
Location: Orlando, FL

Ok, well hang in there. Augusto watches these posts and I'm sure he'll chime in. Just check back..

Jeff
06-12-2006 Over year old.
 
 
Chopper
Key Veteran
Location: Stow, Ohio, oops, I mean St Louis, MO

I answered some on this post in a different forum. It is not phasing. It is trim effect. It is a combination of flybar and delta and dampening that solves the problem. It is also an effect of the canopy in the wind. All rotor heads do this to some degree, depending on blades, paddles, flybar interaction and other variables. The heli will always lift its rotor 90 degrees after the wind. How much.....now that is the question.
The answer lies in "how much trim effect are you willing to tolerate?" By virtue of the fact that you now notice this, it means that you can hover some in all attitudes in the wind. Good.
Now the second thing is that it takes a LONG time to work out all of the details to get a model to sit in "trim" in all wind conditions, and the results will vary on each type of heli some due to the CG and fuse design. This is just the tip of the iceburg....so to speak.

Paul Soha is a Futaba Team Pilot , Aurora Team Pilot, Wildcat Team Pilot, SAB blades
06-12-2006 Over year old.
 
 
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Avant Aurora - EFX - FX > Avant head problems
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