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HomeAircraftHelicopterMiniature Aircraft Whiplash & Fury 55 › x-cell paddle flapping
07-21-2002 09:21 PM  16 years agoPost 1
vagpas

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Thessaloniki-Greece

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Hello
I have an SE with the 0.5 deg coning head and when the heli is hit by a side gust wind the paddles go up and down and don`t rotate in the same plane.
I used Hirobo and Kiosho paddles at 50g. Same thing.
Everything `d been checked on the bench and found true.

Has anyone any idea of what might cause it?
Is it an inherent problem with the coning head?

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07-22-2002 05:08 PM  16 years agoPost 2
Chopper

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Stow,Oh- oops, I mean St Louis, nope Stow again,

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If you are saying that the paddles are going out of track, then my guess would be the thrust bearings in the blade grips are bad.

My first guess would be that you have a mixer backwards. This is assuming that all of your links are in the right holes and you don't have a blade mixer backwards or different size balls on any of the mixers. You have the metal head with the side plates, right? Unless you are a super long fly bar or something????

The thrust bearings corrode quickly in the metal grips. This is usually the problem with these heads. Otherwise they are silky smooth and hover very well.

Paul

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07-22-2002 05:55 PM  16 years agoPost 3
vagpas

rrApprentice

Thessaloniki-Greece

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Paul

Yes it`s the head with the side plates.
Thrust bearings are very smooth when you apply thumb force on the bench so it shouldn`t be this.
Flybar 770mm long.(not too long)
All the mixers are in the right place and facing the right way.
I use the outer holes at the secondary levers. Maybe i should use the inner.
Actually I can`t figure out what the secondary levers are for.
Why not link the bell mixer to the flybar directly?
It will reduce the slop that comes from all the extra ball links considerably.

Has anyone thought about it?

Thank`s for your help Paul

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07-22-2002 05:58 PM  16 years agoPost 4
vagpas

rrApprentice

Thessaloniki-Greece

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Flybar 620mm long. Not 770. I read wrong the measuring tape.

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07-22-2002 08:21 PM  16 years agoPost 5
Chopper

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Stow,Oh- oops, I mean St Louis, nope Stow again,

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Yes, yes, yes. Yes, you can do away with the sub mixers entirely. I flew mine that way and I liked the way it flew much better. Just take a bolt and replace it where the submixers come out. This helps hold the head snug to the main shaft. Flip your short links up to the blade grip bell mixer and you are done. You may be a turn or two off of your collective settings. You might find that you like the feel better too. You also want to get the dampening as tight as possible without blade wobble. If your dampners are more than six months old, you probably should replace them. This could also give you problems.

Try this and e-mail me with you results. psoha@fortneyweygandt.com

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07-23-2002 02:58 PM  16 years agoPost 6
CHiatt

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Winter Garden, FL

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Does the whole model wiggle side to side when this happens? I have flown the "sideplate" head quite a bit, the wiggle can come from several things.
- The sub-mixer (the lower one) is meant to increase the flybar authority on the rotor head, use the inner hole on the sub-mixer.
- The damper rubbers might be too wide, as they compress they contact the insides if the side plates. I use dampers that are 14 mm long (trim them with a sharp razor blade) and use the plastic shims to get the stiffness you want. You can also try a light film of silicone grease on the dampers.
- Make sure that all of the ball links on the head are nice and loose, you can make a reamer by scratching a ball end (in several places at 45 degrees across the ball) with a sharp xacto knife. Fit each link so that it moves freely on the ball end without causing excessive play in the controls
- Make sure the rotor blade pivot bolts are tightened evenly, with moderate force to pivot the blades.

Cliff

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07-24-2002 02:05 PM  16 years agoPost 7
Chopper

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Stow,Oh- oops, I mean St Louis, nope Stow again,

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Hi Cliffy. No Nats this year for either of us. How ya been?

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07-24-2002 03:26 PM  16 years agoPost 8
vagpas

rrApprentice

Thessaloniki-Greece

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Thank`s for the tips guys.

It seems that i have some work to do.
I `ll do one step at a time untill i get to the bottom of this.
The dampeners are indeed a bit soft and now that i trimed them down to 14mm are even softer so i ordered new ones.

Is the sideplate head the best for FAI flying after all?
I do F3c -A schedjule.
I haven`t got the chance so far to try a MA top class straight head.
I have the standard plastic on my #1001 back up model but has done more than 500 flights so it is a bit tired.

Is the staight head better in windy conditions?

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HomeAircraftHelicopterMiniature Aircraft Whiplash & Fury 55 › x-cell paddle flapping
07-26-2002 02:18 PM  16 years ago •• Post 9 ••
Chopper

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Stow,Oh- oops, I mean St Louis, nope Stow again,

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Cliffy will tell you the Pro head hovers better. And it does. It is not a huge amount at all. The best solution for windy conditions is a smooth machine and a very tightly dampened head. Once you get the head dampened properly, the differences in the heads dissapear for the most part. Get you dampening as tight as you can stand, and that will inprove the overall flying of the machine.

Paul Soha

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