Originally Posted by kauaikarl
I find that high tire pressure will increase shimmy.......what pressure are your main tires?
If my tire pressure is above 18 psi in my 3 , the gear legs will shimmy on high speed taxi or on landing as I am slowing down...but about the same speed either way. I've got wood on the gear legs too. Now I check the tire pressure before every flight and keep it at 18 and the result is no shimmy. Try it, you'll like it!
I originally used 18 to 22 psi tire pressure to control the gear leg shimmy which occurred around walking speed.
I balanced the wheel pants and could then use 30 psi without any gear leg shimmy. It took about 1/4 lb. (120 grams?) of lead shot in epoxy as a slurry which was poured into the nose of each wheel pant. This balanced the wheel pant forward of the wheel axle.
We are in the process of assembling RV-3 N51RV after 18 years of storage. I had to add at least 1/2 lb. of lead shot in the nose of each wheel pant because of the weight of a fiberglass wall that had been added in the back of the wheel pant.
It helps to balance the wheel and tire assembly, also.
Just as a point of trivia, my RV-3 N47RV certification was used to certify the first RV in Holland. As I remember, the first RV certified there was a RV-4. Around 1988 or 1989.
RV-3A N47RV serial number 50 - LOM M332A engine MT CS propeller