Do you reconise this hull bottom?

[FlyingTime]

Originally Posted by Bushwacker

Nice work and beautiful pics Steve! She must be well balanced because it looks like her running angle up on plane is almost the same as when she's at the dock! I understand that designing a boat with those transverse steps that can make hard turns without spinning out is quite a challenge! Looks like you put some pretty good height on those aft longitudinal steps, so it sounds like you found a good solution with those big vertical surfaces that must have a good grip on the water! I always thought that adding some more aeration with transverse steps would be the next logical phase in the evolution of the VDH hull, so it's great to see that you're continuing to advance Moesly's ideas! Have you ever built any models to test out those ideas?

I have a good book by British naval architect Uffa Fox, and way back in 1912, by going to transverse steps, they got 55 kts out of a 40' 5.5 ton boat with a pair of very heavy 400 hp engines! Denny

Thank you Denny. We had CFD analysis done on a 75' convertible sportfish 3D model that recorded over 60 knots with 5200hp. But, the first real model testing was the 25' prototype that we've been running around for about 3 years now. That boat will run over 70mph with a Etec 250 ho mounted on a jack plate.

[Bushwacker]

Originally Posted by FlyingTime

. . . We had CFD analysis done on a 75' convertible sportfish 3D model that recorded over 60 knots with 5200hp. But, the first real model testing was the 25' prototype that we've been running around for about 3 years now. That boat will run over 70mph with a Etec 250 ho mounted on a jack plate.

I was thinking scale models (I'm showing my age!), but yea, if you have CFD capability, that's obviously the way to go! Analytical models allow you to quickly evaluate a lot of tweaks and provide good insight on what's really going on with the water flow along the hull! And having a prototype to verify the analytical model is even better! 70 mph on a 25' boat with about 275 hp is impressive! The bass boat guys would be jealous!

[manitunc]

Originally Posted by FlyingTime

Thank you Denny. We had CFD analysis done on a 75' convertible sportfish 3D model that recorded over 60 knots with 5200hp. But, the first real model testing was the 25' prototype that we've been running around for about 3 years now. That boat will run over 70mph with a Etec 250 ho mounted on a jack plate.

Is that prototype going to be made for general consumption? We need a new contender in the 25' single engine range. I want one.

[FlyingTime]

Top is on today but still much more to do, new props are next. Thinking standard 28" Bravo 1's hopefully will bring her up to 6400 rpms when the superchargers can take over and push us to 7000+...

[FlyingTime]

Originally Posted by manitunc

Is that prototype going to be made for general consumption? We need a new contender in the 25' single engine range. I want one.

The 25 is a one and only...