Velocity Tom

I was wondering if anyone has done any testing on sharpening the leading edge of a Imco skeg?

I have shortened a few and sharpened them but never tested back to back?

glassdave

Wilson Custom Marine

https://www.proboat.com/blueprint-for-speed.html

BUP

call IMCO I know they claim better handling with the skeg extending it forward more to front of the bullet .

Pic below what I am talking about

http://www.imcomarine.com/cal_store/...lete-1131.html

thirdchildhood

BUP, that picture is interesting. Are all Imco lowers being made like that now?
I did a lot of work on mine. Besides sharpening the leading edge and thinning areas I did a lot of experimenting with the water inlet size and location to get the pressure down where I wanted it and to greatly reduce the cavitation burn behind the intake which seems to be very common. My water inlet has since been welded up at the front to make it even smaller. Cav burn is now only a small line and pressure is right where it should be without having to run a relief valve but I saw no noticable speed increase.


The inlet now: You can see where it was welded up and where the deep cav burn was also filled in.

Dean Ferry

Curious, why didn't just install a pressure relief valve? I have one, and it lets me adjust my H2O pressure to no more than 30 lbs at WOT......

thirdchildhood

I did briefly. They can stick open though and Allen Brown himself advised me against running one. I was also trying to solve the cav burn issue and that had to be welded up anyway. The stock intake is just way to big and goes back too far. I looked at a lot of shortys on boats and most had this problem. This is mine before it was welded up. I had my welder close up the back of the intake at the same time. Later I had him re-weld a few pockets and shorten the front. I finally got it perfect. No pop-off valve needed!