I have a tail heavy stunt plane and am looking for a 'acorn type' prop nut that is made of brass or other heavy material that I can install on my OS-FP40. Have looked at the normal supplier's web-sites but have not found one. Does anyone still offer these in various weights to fit a 1/4-28 thread?

Thanks,

Denis Downs

I seem to remember hearing about melting lead into the cub on the backplate as an option,, not sure if I would melt it into there or form it and then attach it,, but hey its an empty hole,, might be a good place to hide it also

Remember that these place a lot of "bad" weight on the end of our crankshafts and help speed up the wearing out process of plain bearing/bushing engines.  Especially Fox 35s!  According to what I have been told, it might be the best cause of broken cranks in the fox35.   Adding lead to the airframs nose is safer for engine life.

What Bill said.
We have a two piece Fox crank in the club to prove it!   
Roger

I have made the calculation and shown somewhere (SSW I think) that the moment of inertia of a heavy hub is neglible compared to a modern plastic prop. I haven't cut up a wood to calculate the difference. Remember what counts a lot is that the flywheel effect depends only linearly with mass (or weight) but on the square of the radius to the mass.

I am sure nothing is tougher on the old Fox than a plastic 9-6 Foxberg/FoxyHazel prop!