Quinlan

iTrader: (1)

I was with Tyson in the Skater V once and we had to surf down some wakes to get on plane lol

those D Maxs sure are Sweet looking !!

green lightning

I think diameter is going to be key as weather she will get on plane or not , those videos look just like my boat when I was trying to get on plane with some 16 1/2" props that I borrowed .

Team Archer

Big V bottoms need big diameter. Our Cummins powered 48 we ran 18" dia 5 Blades tried some 17 " props and all we did was blow them out like you are doing.

Charli

Your build is amazing kidturbo, along with your skills! What an amazing owner also. Have you spoken with Gary Smith or Vern at WestCoast about these drives? Although Pat is amazing at what he does, I think you are going to have headaches with these. The original Predator put some power to these and they were always off the boat getting rebuilt. Have Vern build you some 6's and be on your way......although the challenge to get these right is probably right up your alley!

kidturbo

After some digging, here is what found from setting up the drive height way back when.

This boat was originally setup with 1.50;1 ratio #6 drives, and what looks to be 1.5" or 2" spacers in the pictures. It was propped with 17x35p 5-blade cleavers, and that's about we know since I never saw it on the water. The new Weismann prop shaft height was setup to run fully surfaced based off a hull running angle of 4deg, and a distance of 54" off the transom. The drawings below show shafts at about 2.5" above bottom. This was later updated to reflect a 7deg running angle, and thus we raised the shaft height an additional 1.6" to be fully surfaced around 70mph...

The extension boxes are drilled with 5 adjustable height options at 0.80" apart. We are currently in the highest setting, placing the shafts roughly 4" above the bottom at 54" off transom. At max down angle, knock a couple inches off that figure. Using low gear, our final drive ratio is a 1.61:1, with a potential 2200lbft of torque on hand. Hence the reason for swapping 6's to the Weismann's. That and the wider gear ratio options his allow for.

The first goal was to just get up on plane and record some video of how deep things actually run. While I agree 18" blades might be the ticket, not sure that alone is going to resolve the issue. The biggest advantage to these drives over an ASD8 we considered was ability to easily adjust height with the boxes. Maybe a little better trim angles like a 6, but beyond that, I'm afraid we're still gonna need to address the torque limitations.. Unless it swallowed a fish or something...

hogie roll

I agree with the spinning out idea. Creates more stern lift which might be the ticket with heavy drives and diesels.

302Sport

You need 18” props with 20 degree rake and vent tubes!!

Smaller diameter props and dropping the drives might work and be cheaper, but it’s definitely the wrong way to do. You will scrub a lot of speed and mind as well have not spent the time/money to build the motors to what they are

IGetWet

Not to beat a dead horse here but I was blown away how big of a difference there was between a 15.875” diameter 5 blade and a 17” round ear 5 blade on my boat. The smaller prop was a pain to get on plane and the 17” I could just about take off like a jet ski. And this was in a 25 Baja with the drive 2.25” below the bottom and prop leading edge about 42” back. I bet this boat would get the best results from a good set of round ear cleavers, 17”+ diameter. After it’s up and running your going to need some trim reaction too. There’s a flat bottom cig I see around time to time that runs that style prop with arnesons.

302Sport

Take all your drive height calculations/drawings/etc...., crinkle them up and throw them in the fire. Then go put the right prop on the boat.

offshorexcursion

iTrader: (5)

Years ago I looked into buying a 40' outlaw with #6s. I called everyone that knew about them and they all said that none of the 40s ran good with 6s. I can't remember the speeds or measurements but I know they were slower than they should have been. Point is if they couldn't figure out setup back then it makes sense why it might take some work now.

I can tell you dozens of different boat combinations I personally know that ran better lowering the drives. We all mentally "think" higher is better and faster but it doesn't always work that way.

Yes bigger diameter props should help but going from 17" to 18" only gets you 1/2 more bite in the water. Your drives may be 3-4"!!!!!! Tooo high.

Lower the boxes as far as they will go and at least be able to drive the boat and get a baseline number. Then as you find more props to borrow you can raise them and test.