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HomeAircraftHelicopterBeginners Corner › Skid hopscotch vibration durring run-up on Rappy 50
04-20-2009 06:21 PM  9 years agoPost 1
CUJO

rrApprentice

San Angelo, TX

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So I took my Rappy 50 out today to see if it would fly, but as I got the throttle and rpms up it started to do a hop/bouncing between the skids which I assume is because of something unblanced.

I came home took the head off (without the shaft) and balanced it and reading from the tips its was 3 3/4 inches on one and 5 3/4 inches on the other one from being balanced. Question is, is that a possable reason or does balance just mean that you don't have one tip go all the way to the ground? So should tape fix that?

Secondly, I put the gains and everything to max on my GY401 but now wonder if once it got the tail up to speed what I'm seeing is a result from too much gain on the gyro and it's overcompensaiting itself? Should I go back to defaults or cut it in half? I noticed that when in the shop if I moved the tail the servo barely moved, but was I expecting too much movement? The heli dosen't hold it's nose durring run up and once it seems it wants to hit takeoff rpm is when the bouncing started. I did have to compensate axial movement with rudder and wondering if that was a result of the gyro not set right, or it's set right but too much and that's how I got the bounce.

ps. It almost scared the crap out of me, not even 10 minutes of flight and it was going to shack it's self apart without leaving the ground.

I made the assumption that everything being stock that everything shouldn't be that out of wack. Heck I had a Mini-boy in the 80's that didn't do anything like that!

Thanks in advance for any help.

Rappy 50 Titan, OS Hyper 50, Futaba 2.4 7ch.

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04-20-2009 06:43 PM  9 years agoPost 2
TRACERBOB

rrVeteran

Closer than you think

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Were you on a solid surface such as concrete or asphalt? My Rappy will dance a bit on hard surfaces as I do not have the rubber things on the skids. So, I only lift off on grass surfaces. Just a thought.

Life is hard. Harder when your stupid

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04-20-2009 07:00 PM  9 years agoPost 3
The_Dave

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Las Vegas / Pahrump, Nevada

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~
As it would be impossible to know what is going on without actually seeing it I would suggest you get some local help. I highly doubt your head is that out of balance, assuming you are using factor built blades and you assembled it correctly.

Again, save yourself the headache and get some qualified local help.

Mark McAlpine - 2005 - We will never forget.

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04-20-2009 07:01 PM  9 years agoPost 4
Gearhead

rrMaster

Vt

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yes, as Bob said many helis will do this on a hard surface, but then again the Raptor is known well for wobbling during spool up,, it could be a simple as one blade being tighter than the other,

as for your gyro,, if your using a Digital servo I hope you have set your Delay as low as it can go (0), and I hope you have your Limit Pot set so there is no binding,,

now with that said, as Dave pointed out, the best thing for you to do is to get a good pilot to check-out your setup and fly it for you..

Jim
Buzz Buzz Buzz

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04-20-2009 07:10 PM  9 years agoPost 5
CUJO

rrApprentice

San Angelo, TX

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ya, I was on blacktop but I think this goes past the normal vibration check. I don't know if balancing the blades will make that much of a difference as I can't see a copule of grams of weight difference making that much vibration. I have a club here, but I work mostly when they're off so it's hard to get by and get some help.

Rappy 50 Titan, OS Hyper 50, Futaba 2.4 7ch.

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04-20-2009 07:57 PM  9 years agoPost 6
CUJO

rrApprentice

San Angelo, TX

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OK, I loosened the main blade grips and ran it up on grass and though I did see the vibration in the head I throttled up and it smoothed out once I got past a point. I think if it was on concrete or blacktop I can see where that would be accenuated ALOT. I did get a couple of inches off the ground but since I was in my little back yard I called it quits and know that I can go to a field and fly higher.

Rappy 50 Titan, OS Hyper 50, Futaba 2.4 7ch.

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