42 Staggered speed vs. HP
 

Anyone have a rough idea of what kind of HP it takes to push a large step 42 to 100MPH, 120MPH, and 140MPH?

Here is the set up. '98 Hull with staggered configuration, ASD7's and full cabin. I'm in the process of starting my engine build for next season, and I want to make sure that I'm making the right parts decisions to start a strong foundation for the engines.

It's a fountain correct?

Newer 42's with 700 Mercs are running over 100, I would think you can do the same even with hull changes over the years with 800hp no problem. I hope to find out for sure in the spring.

Yes, sir.

I don't know why, but it occurred to me last night to search YouTube. It seams that the boats running 700's are in the 105-110 range and the 1075 boats are 125-135 or so.

Now I'm left to wondering this. How much more speed can a boat pick up running Arnesons vs. #6's?

i think sixes would be a little slower but arnesons i think would be good for 5mph

The arnesons are good for 7-9 on a 525 big step 42. I would think
with big power 5 mph would be reasonable number to expect

Do any arneson fountains exist out there to know ???

Yes and a OSO member owns a few of them. Cant think of his name.

700 and sixes 110+ 1075 135+ you always have to take into consideration the boats setup. You can take a 525 boat and make it 700 hp and it wont run like a 700 boat that was built as a 700 boat.

That makes sense. I was hoping to get 120 out of my set up with 800's, but if I have to turn the wick up I guess that is a possibility. I'm dumping off some weight without compromising the cabin (that my wife must have) so I guess we will see.

remember you are a older hull and you are not running #6 drives those speeds would be 2004 and newer hull

Keep us updated on your build! Might as well go for 900-1100 hp and enjoy! :whistle: Love those arnies!

Unless the Arneson's are significantly faster than 6's (which I'm not sure will be the case here), you'll need more than 800hp to run 120. Probably closer to 1000+. The older (early 2000's) staggered 900/6 boats generally ran in the 115 range give or take a couple mph depending on setup. 800hp will probably get you in the 105mph range (in normal running conditions with gear, fuel, people, etc).

I think you're right on the power. Regarding the difference between ASD's and Merc SSM #6's I think that the main difference will be the overall weight of the drives and power. I have yet to weigh my power VS. Mercury Racing power but I'm hoping to save 400 lbs. per side, and that is not including the weight deference in drives.

You would have to get those arneson,s way down deep and together to get the right attack angle, allot of glass work .

I had a early 2000 42' stagger 900 boat that ran 115ish . Know of a late 90's stagger stepped 42' with 950's that went around 110 . Both set up at the factory for big power with 6's . Not sure what power the Arneson #7 drive can handle HP wise , you may want to check into that first . Hope this helps , good luck with your projects :popcorn:

Im guessing you're gonna need quite a bit more than 800hp a side to get 120mph out of a 98 Step boat....IMO. I am currently running 1000+hp YPM motors. Best speed the boat ever saw was 122mph...but that was with IMCO SCX Toaster Oven shaped lowers.....lol.

Sixes are going on the boat now.....we shall see. Im guessing 130mph.....tops. Boat is an 05 hull and has been totally re-rigged/blueprinted by R3 and crew @ RF. FWIW......

Good Luck!!