yakdriver said:Get a Bogi-bar. It is the best towbar for RVa models made. Don
bogert-av.com
They say that is not good for the prop bearing too.
Even though this is an old thread, I want to thank you guys for mentioning the bogi-bar.
I just received this tonight and I love it. That locking mechanism will probably lock that onto the nose wheel and prevent falling off until unlocked. The handle also seems sturdy and I like the pin on a chain approach for locking it too full extension. Those sponge rubber grips on the handle are deluxe.
The outer dimension of the bar (hole for the wheel pant) is 3/4". The inner diameter of the bar which fits over the big hex nuts is a snug fit.
This is a nice tow bar!
Wouldn't pulling the nose up, or yawing the plane into a slip, put large twisting loads on the hub due to the gyroscopic precession? My gut feel is that they'll be much greater than an owner pulling it by hand with his/her hand close to the spinner. Or maybe it's not, and this is just another reason to stick with a fixed pitch prop.The centripetal force exerted on the blades in flight is many orders of magnitude higher than the thrust / bending loads exerted on the blades which relieves the fwd bending load. When pulling on the ground, there is no relief.
Do yourself a favor and replace all the nuts and bolts on the tow bar with MS hardware. If you plan to use it a lot eventually the stock bolts/nuts will bend and fail on you. Otherwise it's a convenient, nicely engineered and a light thingy.