Prop tip to rudder clearance

Currently building an inboard fishing boat.
I want to use a strut that I have ( rather than buy a new one)
Using this strut will give me about 3/4" clearance upper prop tip to rudder leading edge. ( rudder is vertical, shaft angle is 12degrees)
Will this be a problem?

 

You need 20% of the diameter as minimum tip clearance. Class require a minimum of 17% and a real bare minimum you could maybe get away with 15%. Any less and you'll incur problems.

 

Looks like it's new strut time
Thanks for the info

 

Ad Hoc is correct. A potential for vibration... and, how will you get the prop on/off the shaft?
What are your other clearances like?
Move the rudder aft?

 

Can't move rudder. Guess I'll have to get a strut with less drop. Just need to keep the tip to hull clearance right ( about 2")

 

keep the prop tip/hull clearance at 20%Dia. at the very minimum 15%
There are diagrams for all the clearances - prop to hull, rudder, shoe, strut, etc.