Paul
Tell me how many bolts and size to attache the prop flange to propshaft
and wich grade


Jean Prudhomme

This must be done exactly as shown as Jarret spent a lot of time
doing FEA's on the subject. The zip file contains a stp file
that will load into Rhino or Solid Works. The zip file has the dimensions.

 All you need is sixteen 1/4 inch internal wrenching screws. I would however recommend a prop weight of less than 30 pounds. Preferably with carbon fiber blades.

Wire-Lockable Steel     

Black-Oxide Alloy Steel— Comparable to Grade 8 steel. The black-oxide finish provides lubricity and mild rust resistance. Thread sizes through  1/2" have a min. Rockwell hardness of C39 and min. tensile strength of 180,000 psi.
http://www.mcmaster.com/#catalog/116/3097/=a8u1m9


Paul Lamar