Just curious of what peoples opinions are on the upper HP or KW limits of the old Rotax small 75mm prop hub pattern? I know they switched to the 4" (101.6mm) pattern but there were a lot of 912's made with this smaller pattern. Were they addressing an issue (anyone have a problem?)or just looking forward as they were developing the 915? I have one of these props and I am considering drilling out the 5/16" holes to a 3/8" diameter. This by the way will be on my own PSRU I am testing so I can machine the hub with whatever pattern and bolt size as I need. Thanks.
