shakes constantly in flight

[Mark Sanders]

Hey I got some shaking or a hit as its called im going to try tracking the blades their sopos to be pre done from sport copter for my sparrow hawk. does anyone know if that would cause the hit or bump every revolution of the rotorblades?

 

[birdy]

Mark, there are alot of things thatll caues a shake in a gyro.
Is it just stick shake or dose the hole machine shake, wot size rotors,..........?

 

[dragonflyerthom]

Mark
Is the hit while the rotors are running down? If it is and the wind is up a little then you will need to push the cyclic forward until they slow down. Wind is getting under them.

 

[Mark Sanders]

The whole gyro has a bump bump bump every revolution in flight.

 

[Chris Burgess]

I never met a rotor that couldn't use an adjustment. We need to know a lot more to help you out coolbreez. Shake horizontally, vertically, hop? Bump, bump is not enough. Shakes per revolution, etc, amplitude and direction help narrow it down some.

 

[dragonflyerthom]

I would check the towers and make sure there isn't any slack in between. If there is then you will need to place some thin washers there. If not you will need a second person to be outside to observe the rotations and see if they can see a strike or movement. Also how long has this been going on?

 

[Mark Sanders]

It seems to forward and aft not much in the stick its the aircraft i flew with two other pilots who are instructors but their not sure what it is ether. today im going to try tracking the blades maybe call sport rotors. we checked the space between the towers off maybe two thousands of and inch

 

[gyromike]

It may be your track is off.

I check tracking by rolling into a left turn (maybe 30º) and looking at the blades at about the 1'30 position on the tip path. A left turn puts the blades against the sky making it easier to see the tips. If you can see two distinct tip paths, they're off. For some reason I can see it better when in a turn than straight & level.
When tracking mine, I start adjusting until smooth, then go past smooth till it starts shaking again, and then back to smooth again.


IIRC, the SportRotors have pitch adjustment on each blade. It's possible that the undersling may be off if you have too little or too much pitch. More pitch = slower RRPM & more coning, and opposite for less pitch. Improper undersling will cause a two-per-rev vibration too, but I tend to feel that in the stick more than the frame.
Call SportCopter and see what they recommend for RRPM.

I'm sure others have different methods, but this seems to work for me.

 

[WANABEPILOT]

just a thought

just a thought

to fly a gyro it takes more than a pilot
you have to be a mecanic, afortune teller to make guesses if you machine is working fine ,if you fly with a machine that bibrates more than what it has to. please add some wings just in case there's my 2 cents

ps . i hope i make sense:noidea:
:boink:

 

[Harry_S.]

Like Mike said. What is your RRPM when straight and level?

A lot of questions involved here?!


Cheers

 

[Fl90]

Did you add anything to the head when you installed the rotor. I tried an electric prerotator at an odd position once and got the same kind of "whole machine" shake, it turned out to be the wrong weight in the wrong place.

 

[Mark Sanders]

It turns out that one blade is 2" higher than the other at130 RPM.track the blades useing a mirror and reflector tabs on ends of blades.called sport rotors told them what it was doing and they said its out of tack.then had to use a dial indicator from ring gear to hub bar and loosen two bolts on top same side between teter towers.and tightin other two its the four bolts their on top. using the dial indicator only to move the ajustment 10,000 of 1 inch that equels one inch hard to explain but not to difficult to perfom.then spun the blades still had some shaking try another 10,000s in a day or two storm rolin in here in
AZ. thanks for all the input. mark and the breezer