Gary Anderson

My fear would be that 1200hp would have a lot of torque, and the prop to transfer that much hp would be pretty large. This could result in a lot of that torque twisting the boat resulting in a poor riding boat with a lot of chine walk. Most of the high hp single engines applications I've seen were on cats. Maybe the wide sponson placement minimizes these effects compared to a V hull. But I guess you can always experiment.
BTW, do you need a crash box? I've got a a spare one.
Gary

turbineboat

Excellent point, thats the kind of info im trying to learn.
What crash box do you have??
email is [email protected]

puder

i'm think maybe a twin drive setup wiath splitter box might be the way to go. Get two smaller wheels in the water driven by one big ole turbine.

Gary Anderson

The only downside to a splitter box is that if one prop came out of the water, all the torque would be transferrered to the drive still in the water. A bravo wouldn't survive long with that kind of hp. A staggered 18" drive spacing would minimize that though (hopefully).
But a turbine, brake, splitterbox, twin bravo installation would be a relatively practical, lightweight setup for that hp. And with the exception of the turbine, fairly affordable.
Gary

Gary Anderson

BTW, Eric. I sent you an Email about the crashbox.
Gary

puder

i though turbine produced torque graduatually and make HP by spinngin ridiculously high RPMs???

and becasue of that they arne't quite as abusive to drives as say a 700cid 1200hp blown big block

MadMat

Biggest problem is governing power turbine rpm when prop comes out of water or else it'll go bang quickly. Arneson ASD8 can handle the torque I think, (assuming about 6K on the output shaft). You could easily forget having a box at all, just direct couple, and use twin electric motors for maneoverability in the dock. That way you'll also keep the turbine installation as simple as possible, not compromise maneoverability when docking, and have a get you home backup (albeit slow and not too far, but hopefully just far enough to get you out of the sh*t. You'll have some really big batteries on board anyway to start the turbine).
Been waiting for you to get started on this project and have been researching it myself. Unfortunately doing a decent marinisation on the turbine is out of my price range for now.
Cheers
Matt

MadMat

P.S. Forgot to say Good Luck!