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-   -   Nose wheel vibration (https://vansairforce.net/community/showthread.php?t=189667)

chevytoo 12-04-2020 06:19 PM

Nose wheel vibration
 
I have had a vibration from the nose wheel since day one. I first thought it was shimmy. I tightened the nose wheel fork one castellation. All that did was make it more difficult to steer while taxiing. I saw in a shadow while landing that the nose wheel was bouncing vertical up and down. I have the original Vans setup with the axle bolt torqued to 7 to 10 ft lbs. The force to rotate the tire is about 6 lbs. I have backed off the torque of the bolt to just snug and made sure neither the bearing nor the adapter rotate with the wheel. Have not yet test flown but the drag on the wheel feels close to the same. Any ideas what is causing this vibration?
Ray

Skid 12-04-2020 06:45 PM

Have you balanced the nose wheel?

Steve Melton 12-05-2020 07:25 AM

I recommend to change the bearing to a different style.

chevytoo 12-05-2020 01:02 PM

Yes it balanced checked better than most aircraft tires.
Ray

N40ES 12-05-2020 02:24 PM

Check out Antisplat Aero Bearing Mod
 
I sent a New Tire & Tube & Rim to Alan for the bearing Mod Install. He had to shave the tire to insure it was perfectly round. Claims it is surprising how many tires are "In Balance" BUT "Out of Round". Check out his video's!

Carl Froehlich 12-05-2020 02:46 PM

Sometimes you just get a bad tire. Recommend:
- New tire
- Use the Matco replacement axle instead of the stock Vanís setup. You can then set the bearing pre-load just like you do the mains: http://www.matcomfg.com/axleassembly...dv-3657-1.html

Carl

Skid 12-05-2020 03:33 PM

+1 for the Matco axle.

rightrudder 12-07-2020 11:04 AM

+2 Matco axle. Properly adjusted, the stock bearings will not contribute to shimmy whatsoever.

bruceh 12-07-2020 01:17 PM

My nose wheel tire needed replacing. Bought a replacement from Van's. It is VERY out of round. It can really start bouncing at certain taxi speeds.

rvbuilder2002 12-07-2020 02:11 PM

Quote:

Originally Posted by Carl Froehlich (Post 1482895)
Sometimes you just get a bad tire. Recommend:
- New tire
- Use the Matco replacement axle instead of the stock Vanís setup. You can then set the bearing pre-load just like you do the mains: http://www.matcomfg.com/axleassembly...dv-3657-1.html

Carl

FYI, Van's has a new nose wheel axle design that is very similar to the Matco axle (though less expensive).

I think it now is the standard part in tri gear finish kits other than the RV-12.


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