The V 20 hits 50mph tops, but any faster ?

[RidgeRunner]

I ain't affraid.
I have a 2.4L Merc 200 pushing 48mph on a bracket. The boat is heavy for a lot of speed but she feels great. Turns are not a problem at 48 she still has some edges in the water. In a few weeks my CC gets a 3.0L 250EFI. I won't know top end for a few weeks (break-in) but I think it might be close to 60. I did a similar swap on a 22 Pursuit Cuddy and went from 41 to 55mph. Doing it to cruise 40 at about 4000 rpm.
My 20 has some hook built into the chines, all of them probably do. I removed about 50% when the hull was flipped and spent countless hours blocking and sanding. I would guess the round keel at the stern will probably give a bit of chine walk at ??? speed. With no real pad to run on I don't really know. Maybe it will rise to the innermost chines and just fly.
These boats sold, virtually unchanged, for how many years? The reason is that they handle water better than most, everyone love the lines and they offer good versatility.IMO
A 300xThat would be cool. You could never be accused of underpowering. Boat Insurance? Call Lords of London...

[reelapeelin]

Originally Posted by RidgeRunner

I ain't affraid.
I have a 2.4L Merc 200 pushing 48mph on a bracket. The boat is heavy for a lot of speed but she feels great. Turns are not a problem at 48 she still has some edges in the water. In a few weeks my CC gets a 3.0L 250EFI. I won't know top end for a few weeks (break-in) but I think it might be close to 60. I did a similar swap on a 22 Pursuit Cuddy and went from 41 to 55mph. Doing it to cruise 40 at about 4000 rpm.
My 20 has some hook built into the chines, all of them probably do. I removed about 50% when the hull was flipped and spent countless hours blocking and sanding. I would guess the round keel at the stern will probably give a bit of chine walk at ??? speed. With no real pad to run on I don't really know. Maybe it will rise to the innermost chines and just fly.
These boats sold, virtually unchanged, for how many years? The reason is that they handle water better than most, everyone love the lines and they offer good versatility.IMO
A 300xThat would be cool. You could never be accused of underpowering. Boat Insurance? Call Lords of London...

All I can say is...VIDEO!!...

[THEFERMANATOR]

I guess I'll go for 54-55 since this baby got 56. http://orlando.craigslist.org/boa/1341039507.html Same basic hull as the V-20 and it's a CC, although that 300XP is pushing 300+HP to the prop easily.

[RidgeRunner]

Thanks for all the input. Going to the lake now for a marathon break-in session. Try to post a pic.

[RidgeRunner]

First trip to the water was a success. I had a few problems. Trim pump won't trim the motor under full throttle acceleration. Wires look suspect to me. But it is probably a check valve issue in the pump. Second problem was the paint job on the gearcase. All the paint was stripped off while underway. No signs of primer.
250 EFI motor ran great. The additional weight did not go without notice. I prefer the lighter 200 and the way the boat would sit without the extra weight. The boat will porpoise now with higher trim angles but seems to go away with a little tuck, used the trim tabs for the first time.
The boat planes at 3000 rpm without trim tabs and runs 24 mph, 34mph @ 4000 rpm , 44 mph @ 5000 rpm and I saw a brief max speed of 54.1 mph @ 6100 rpm. Only four hours run time with new rings I didn't want to push my luck.
Boat handled great, no noticable difference on plane and no problems with the extra speed. Obviously not enough prop but I have a good feel for what it is capable of now. 60mph ain't gonna happen.
I was turning a 14.25" x 19 pitch Quicksilver prop.
The bow isn't flying. I am going to try a prop with more cup and rake. Any suggestions?

[THEFERMANATOR]

Originally Posted by RidgeRunner

I am going to try a prop with more cup and rake. Any suggestions?

I would be careful about going that route. More cup and rake will INCREASE your bow lift and make your porposing worse. I would try a 4 blade prop with moderate rake to it as that will help to lift the stern up some and help hold the bow down. Call Ken at PROP GODS and see what he says.

[Genie Aye]

Originally Posted by THEFERMANATOR

I would be careful about going that route. More cup and rake will INCREASE your bow lift and make your porposing worse. I would try a 4 blade prop with moderate rake to it as that will help to lift the stern up some and help hold the bow down. Call Ken at PROP GODS and see what he says.

I am in the same situation with my set up. The evinrude stainless prop has a big cup and rake and gives to much bow lift for my liking. I am going to try a couple 4 blade props to see about picking up some stern lift.

my speeds--Just FYI

4000@37
4500@44
5300@53+

But I am swinging a 15 1/2 X 19 rebel stainless prop.

I will by the hub -prop set up so I can run several different props to see witch 4 blade is going to do what I want.

[RidgeRunner]

Originally Posted by THEFERMANATOR

I would be careful about going that route. More cup and rake will INCREASE your bow lift and make your porposing worse. I would try a 4 blade prop with moderate rake to it as that will help to lift the stern up some and help hold the bow down. Call Ken at PROP GODS and see what he says.

Thanks Ferm I saw the Prop Gods on Google. For $95/hr they come to my lake and the fun begins. Since I am running a few too many rpm now the 4-blade 19 might be perfect. I never had any porpoising at WOT only at lower rpm while cruising with too much positive trim. I was thinking that the bow is riding pretty flat at WOT.
This hull was never intended for this much speed. It isn't scary fast but it really isn't practical either. When I get to go fishing on the weekends, I don't get to choose what the weather is going to be. The extra speed could be used about zero percent of the time on my average outing. I like the 35mph cruise @ 4000 rpm. I understand the 4-blade kicks butt in mid-range and acceleration.