Head Control Rods catching

[dennis22g]

Hi Guys,

I have just put my servos in my basic 550 Hurricane. Everything looked smick until I started to setup the radio and move the servos around.
I really believe I am doing something wrong but just to look at the head in operation one would think the design is way out.
Simple example: Starting from pitch at zero and all controls level, as I move forward stick (down elevator) the long arm that goes from the swash to the blades rubs on the swivel for the flybar.

What is happening. Do any of you have a similar problem?

[Fredrick]

i have the same problem but it does not seem to do anything with the flight handling of the heli.
i do flips rolls and did try out som piroflipps but nothing seems to be affected.
as far as I can tell

[Mikej]

Dennis,

Mine certainly doesn't do this - any chance of some pictures ?

Cheers,
Mike.

[dennis22g]

Thanks for the replies guys...
Since posting this I have put the blades on and set the pitch. This has moved things around a little and the problem is no where as bad as it was. Although the bottom end plastic ball clip just touches the centre rocker bit on the main shaft.
This position seems to be only on extreme movement of the controls.
To fix the throw I have had to reduce my end point adjustment to around 60% throw.
This 60% still gives me maximum movement on the swash, which seems totally different to my Trex 450s.
What do you think? I will get some pics ASAP.

Dennis.

[Mikej]

Dennis,

From your description it sounds as if you mean where the washout arms pivot on the washout base - there should be some clearance there.

Here are a couple of pictures of mine in case they help ...


If you haven't done so already I would recommend that you watch the Finless Bob build videos here .. http://www.helifreak.com/showthread.php?t=31211

Cheers,
Mike.

[dennis22g]

Mike and Fredrick, thanks for your reply.
I have watched Bobs videos and as always they are great.
Mike I noticed your flybar control arm is different to mine.
Yours is a single right angle arm where mine is the same as the align;
I wonder which is the later?
Anyway since watching Bobs video I have realized that my control arms on my servos are not offset. I guess I will have to buy some wheels and drill them as per the template.
I think this may help something.. I don’t know what the reason for the offset is yet.

I am getting closer ( I hope) to flying but I really want to sort out every possible little thing first. Just a confidence thing I guess. Sorta makes me fly better.
I will keep going with your suggestions and let you know how it goes soon.
When I work out how to post pics I will show you what it looks like.

Tks.. Dennis

[Mikej]

Mike I noticed your flybar control arm is different to mine.
Yours is a single right angle arm where mine is the same as the align;
I wonder which is the later?

Tks.. Dennis
Dennis - it sounds as if you have the CNC flybar cage

http://www.helidirect.com/images/helicopter_parts/hurricane_550/204679.jpg

Cheers,
Mike.

[dennis22g]

Mike, Thats it exactly.. Is there a problem with that type of flybar do you know?

Just today I have given it a rev up and attempted a lift off..
Getting close bit I have a few tuning problems.


(Scared me out of my wits.) - After revving up to about 60% just before lift off, I decided to check the tail drift. so I powered down and wow, the whole thing started skipping and bouncing back and forth and bouncing around. What the hell? is this a vibration problem..
I had just balanced the wooden blades near perfect I thought. I will double check, but what else could it be?:(

I am still very hopefull but I probably need reassurance. I am keen to lift off but I dont want to see my brand new heli explode because of something I have missed.

Does anyone know much about the vibe problem?

Dennis.

[Wazzer]

I am getting closer ( I hope) to flying but I really want to sort out every possible little thing first. Just a confidence thing I guess. Sorta makes me fly better.

Tks.. Dennis

Me too!!

If i am certain the heli is set up as best as possible and everything is in perfect working order its just plain peace of mind. You are then able to concentrate on the actual flying.

For me personally the building, setting up, maintenance and all that is half the fun of this sport.

Someone else is also having the same vibration problems i am very interested to find out what this might be.


Cheers Ben

[Mikej]

Mike, Thats it exactly.. Is there a problem with that type of flybar do you know?

Not that I know of - it comes with the CNC head


(Scared me out of my wits.) - After revving up to about 60% just before lift off, I decided to check the tail drift. so I powered down and wow, the whole thing started skipping and bouncing back and forth and bouncing around. What the hell? is this a vibration problem..
I had just balanced the wooden blades near perfect I thought. I will double check, but what else could it be?:(

How tight are your blades in their holders - the only time that mine moves about is as the blades settle into their proper position on start-up. They should be tight enough that if you hold the heli by the tail (nose hanging down) they should stay still, however if you jery the heli up they would then move - difficult to explain.

Personally I'd check the blade tightness and go over the whole heli to make sure that all of the screws are tight etc.

Good luck,
Mike.

[Fredrick]

here is some pictures of mine.

[dennis22g]

Mikej and Fredrick, thanks.

I love your colours Fredrick and thanks for the pix. I have not got the metal gear though, mine is plastic,,,, would love some though...(my trex had the metal upgrade stuff... looks good)
Mike I have had this suggestion of tight blades on the other thread... I have yet to try it but I do agree. I have not however heard of that method you described! Very good..
Hold it by the tail with blades out to the side.... should stay horizontal but with a little jerk they should move. Great method of tension adjustment! Ten points!

Thanks guys :)

Dennis