Drive spacer question for 29 scarab single

[shotime113]

I would like to know if anybody with high horsepower use's a drive spacer ? And if so what size with a 4 blade prop ?

[Jeff P31]

Can not see needing spacers on a single . just my .02

[scarabman]

Originally Posted by Jeff P31

Can not see needing spacers on a single . just my .02

Agreed. If anything I would be thinking shorter!

[shotime113]

I have 900 hp. And as the tourque come on the prop cavatates I am trying to spend a 30 pitch bravo 4 blade.
Ant thought any help would be great Thanks....

[Jeff P31]

I have the same problem getting on plane but once it is up and running it seems to be fine . Running 1 inch shorty 30 props & 750 hp each . I to would like to fix this problem .

[shotime113]

Thanks Jeff , But I only have a single. And the boat runs very well with some of my fat friends in the back seat. So would that mean that I need a spacer in there? And a bravo 1 for now. imco xr drive next month.
THOUGHTS ????

[hullofjustis]

I had a 29 single engine with 820hp with a 1 inch shorty and had no problem getting on plane with a 26 bravo one spinning 5800 rpm what are turning rpm wise?

[shotime113]

I have only spun the motor up to 5200 and the prop slipage is horable. What was your prop slipage ? And was that a 3 or 4 blade prop ? And thank you for responding:cool :

[shotime113]

4200 rpms @ 56 mph with a 30 pitch prop. the propellar lifts the rear of the boat when hose power is being produced.

[hullofjustis]

at what rpm range is peak horsepower and peak torque? my prop was 26 pitch 4 blade if you are using a 3 blade it will never work with that much hp in that heavy of a boat in a single engine application. where is your propshaft in relation to bottom of the hull?