I am confused about this installation with my new Catto prop - sure wish there was a drawing, but the Saber instructions are written only.
I only have time on the weekends. Of course I can call Sam on Monday but then will have to wait another week to do the work, which is the reason for this post.
First the Sensenich prop and extension was removed. I note that there are six drive lugs in the crank flange. Four protrude and two appear to be a slip fit.
I get that the counterbored holes in the extension are for the short bolts that attach the extension to the crankshaft flange.
Here is what I don't get: It seems like the counterbored holes should line up over the lugs in the crank flange. However the backside (crank mating side) hole diameter is too small. On the other hand, the holes that contain the threaded drive lug inserts to mate the propeller to the extension do have large enough diameter holes to fit over the crankshaft drive lugs.
Seems like either the drive lugs in the crankshaft flange have to be pressed back so they don't protrude or the diameter of the holes that contain the extension to crankshaft mounting bolts needs to be larger diameter on the crankshaft mating side of the extension. The former would result in the bolts carrying shear loads rather than the crankshaft drive lugs carrying them. The latter would mean the extension was not completely machined. The real answer is probably that I am clueless. Can someone please straighten me out?
I only have time on the weekends. Of course I can call Sam on Monday but then will have to wait another week to do the work, which is the reason for this post.
First the Sensenich prop and extension was removed. I note that there are six drive lugs in the crank flange. Four protrude and two appear to be a slip fit.
I get that the counterbored holes in the extension are for the short bolts that attach the extension to the crankshaft flange.
Here is what I don't get: It seems like the counterbored holes should line up over the lugs in the crank flange. However the backside (crank mating side) hole diameter is too small. On the other hand, the holes that contain the threaded drive lug inserts to mate the propeller to the extension do have large enough diameter holes to fit over the crankshaft drive lugs.
Seems like either the drive lugs in the crankshaft flange have to be pressed back so they don't protrude or the diameter of the holes that contain the extension to crankshaft mounting bolts needs to be larger diameter on the crankshaft mating side of the extension. The former would result in the bolts carrying shear loads rather than the crankshaft drive lugs carrying them. The latter would mean the extension was not completely machined. The real answer is probably that I am clueless. Can someone please straighten me out?