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  #11  
Old 06-29-2019, 06:36 AM
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Originally Posted by animal145 View Post
Good afternoon team.

I cheated and bought my rv 8a. I changed my main tires with a a&p buddy. One tire was out of round.

I?m still chasing down a shimmy so I?m going to replace the nose tire and adjust the breakout force.

I?ve done a search but I have not seen how to jack the plane up to accomplish this task.

I have two hydraulic jacks,an adjustable tail stand, and weights.

What is the best way to elevate the nose enough to make this happen?
And Specifically where do I put sandbags/push on the tail to raise the nose?
Thanks in advance for your help!!!

Alex.
As others have mentioned in previous threads if trying to prevent shimmy, be sure and balance the MAINS AND the Nose wheel. - along with breakout force, tire pressure, and no pivot slop.
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  #12  
Old 06-29-2019, 06:54 AM
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Originally Posted by Vlad View Post



Vlad is the man.

You can also use a tie down screw / dog screw and a motorcycle tie down or ratchet tie down to the same effect.
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  #13  
Old 06-29-2019, 07:00 AM
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Walt Walt is offline
 
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I use a case of oil (about 24 lbs) on each side of the stabilizer then crank it down the rest of the way on the tail tie down. takes quite a bit of force (about 100 lbs) on the tie down otherwise. Always center weights over spars/bulkhead etc. to avoid skin damage.

Lifting from the motor mount or engine, that's an awful lot of force on the mount in the direction its not normally loaded in (usually upwards of 300 lbs on the nose wheel). You could tie it to the engine but that's still a lot weight on the 'hook', its so much easier to weight the tail down why would you.
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  #14  
Old 06-29-2019, 07:53 AM
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AlexPeterson AlexPeterson is offline
 
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Might be good to remove the chocks on the mains before driving up the chain. It must be pulling aft quite hard at this point (maybe you removed and then replaced?).
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  #15  
Old 06-29-2019, 03:03 PM
NewbRVator NewbRVator is offline
 
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Once again Vlad wins an award for ?Best in show.?
Congratulations
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  #16  
Old 07-01-2019, 08:25 PM
animal145 animal145 is offline
 
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Thanks all! I really appreciate all the feedback!

I I got the nose tire changed and per the EAA video I put in 45 psi expecting it to drop some... it only went down to 42 psi. I flew it and the shimmy is 95 percent gone now.

Going to drop the pressure to 35 psi. Maybe that will make the shimmy go away completely?

I?ll have to check into balancing the wheels. Sounds like more money will be on the way to spruce if the air pressure doesn?t do the trick.
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