doubletake

I have a 38 t/s with 575sc's. when I bought boat i was running 33 lab finished 4 blades and running 90-91mpg. After investing in intercoolers, the boat would barely get on plan with the 4 blades (washing out due to increase in hp).I then tried 32 4 blade bravo's 32's which didn't help the problem and after further discussion with Bob Teague i spent 3k more and purchased 28p 5 blade 15 1/4 maximus. Well, the boat comes out of the hole like it did when i purchased (great) but now im running in the mid 80's and bouncing off the rev limiter which was increased to 5600. Any input would be greatly appreciated. I spent what i thought was good money on a smart investment to help performance, increase reliability and prevent detonation and know i've lost approx 5 mph. Should i be changing to a larger 5 blade??? thanks for any help you can give!!

BillR

Take your 32p props - send them to Brett @ BBlades.
Have the props "flat pitched" You also may want to add a 1" drive spacer. Mabe a 1.5" spacer if you have a sportmaster drive.

After taking the Tres Martin school, I asked Tres about the set up of my TG. The above is what he suggested. I have done them and his suggestions work. I "just" ran the boat after adding the spacer. I gained about 2MPH from the limited time I have run it thus far.

Your 33p props. Were they originally 34's? If so, talk to Brett about making them easier to plane. The 34's have a "unique" geometry to them that makes getting on plane difficult. He can fix that.

throttleup

Or you could consider changing propellers. The 38' and 39's have been running very well with the semi-cleavers designs on them. We built a set of CNC props for Joe's 39' and the boat picked up several MPH on top.

Julie