OneBFC wrote:axial load ratings would be one thing to check very carefully on the pillow block style reductions.
choose bearings wisely.
You are correct. The turbo belt drive setup was 200 HP at 9000 RPM. The builder used pillow block bearings and split lock collars up against the bearings to lock the shaft from pushing through the bearings. The builder told me that it was important to use spherical double row bearings in the pillow blocks. The ones he used were rated to 1200lbs for axial thrust (each) - the 70" Sensenich prop produces about 800 lbs. from what I was told. His bearings are larger than need be due to the driveshaft size that could be cut down saving weight.