All this talk of 42 Fountains going over 130 on that type of power is facinating. Here are some benchmarks:
Our boat is a 2000 42 Fountain with the superventilated hull(very efficient but safety is always a concern at these speeds), K-planes turned flat, #6 Drives . For power we have staggered full race, best of everything, dynoed at just under 1100HP on race fuel with the boost turned up to to a comfortable point. In the boat we have it set up at 975HP to keep things happy with 92 Octane.
On a good day with a 2' chop and 2 people on board on Lake Superior we are lucky to see 116mph on the GPS.
My friend has the 1997 high speed hull on his 42 Fountain. He has it in for a few minor tweaks at Fountain now to make it exactly like the highly successful 2005 high speed hull which is its decendant. Equipment includes #6 Drives with about 1300HP built, rigged and tuned by the man (Mr. Teague).
On a good day on Lake Superior, this package has seen 122mph on GPS. After the hull tweaks (water pickups being a primary factor) we think we might see up to 135mph given the same power.
Recently Randy arranged a ride for me in one of his new 39 MTI cats with merc 850's. I saw 128 on the GPS in Miami and there wasn't much more to go with the props we were using.
I'm sure some of you have more experience than we do and can dial things in a little better but I'm struggling with the idea that a 42 Fountain can go 130mph with 850's. If the new 42 Fountains can do that, it's time for me to quit goofing with this one and get some new technology. The problem with that is I understand the 2005 hull was as good as it get's. When you guys start blowing by me with 850's I'm going to have a 42 for sale with no power as I drop the little beasts into a 44 MTI so I can keep up.