How fast before blowout??
 

Hi!

I will try out an experiment next year - adding another Promax 300 (SVS) to my Phantom 25. We have measured and I have spoken to the builder, and it should be fine.

At this moment I have a torquemaster lower unit on my current engine. Current top speed is 76-78 mph. Expected top speed is 85-88 mph.

According to Merc Hi Performance the Torquemaster is safe into the low eighties. Should I swop to a nose coned unit? And if so - a Sportmaster with straight skeg or a Bobs nose coned unit (I have one spare). Which is fastest?

Have a nice summer!

Cheeers, Toffen G

sorry not many of us know about o/b's ??? try I think hydroracers.com ??? I think