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#91
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__________________
1985 Wellcraft V-20, Evinrude ETEC 150: SOLD 1979 Marine Trader 44, twin Ford Lehman 120s 2006 Panga 14, Tohatsu 20 
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#93
02-23-2010, 11:12 AM
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You can click on RidgeRunner and look at the pictures in the profile. I don't have many of the rebuild and all of them are poloroid instant pictures. Thanks for your kind words.
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#95
02-22-2011, 02:14 PM
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Ressurection with another prop test. Trying to reach a new speed record (for me) Conditions were OK, 65 degrees, clear day with nearly no wind. The boat likes a little chop. Tried a 25 Tempest, semi-old school with the large square ventilation holes. I mention the large holes because the boat was a pig out of the hole with this prop. Throwing the hammer down from idle the motor would instantly ventilate the prop spinning the motor to 5800 and the boat speed was not enough to get on plane. I had to keep the throttle pinned for what seemed like forever (six seconds)until it finally nosed over. Once on plane things got back to normal. Max RPM with negative trim was 4800RPM running a flat 43 mph. Trim it to neutral and the speed climbed to 48MPH at 5000 RPM. Add a little positive trim and I saw 50 MPH turning the same 5000 RPM. Tried 4000 RPM and I got 40 MPH. Trimmed it out WOT and saw 61MPH (ie. Trimmed it to the end of the trim stroke with a little bit of trim tab) and it would only turn 5600 RPM throwing a huge rooster tail. Conclusions, Too much strain on the motor to get on plane and I know the motor was working harder/using more fuel cruising around. Prop slip is thru the roof. I found a prop the Merc can't easily handle and I could never live with the time to plane. Now I am done, until the next hair-brained idea that is.
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#96
02-22-2011, 11:41 PM
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I had a 19' Renken with 225 Merc that would approach 60 and that boat had a similar splash roll (not quite as pronounced) as the V20 I have now. The splash roll caused a lot of lift issues when it started creeping up over 55. Had a Glastron with a 200 Merc that hit 60 easy but the tiny splash roll on that one caused some issues. I think these things get aerodynamically limited as to what they can achieve due to that huge splash roll up front. You don't see Scarabs, Fountains or Apaches with splash rolls and bass boats sure don't have 'em. Not a boat I'd want to do 60 in but it sure is solid in the low 40's!
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#97
02-23-2011, 02:15 PM
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"Not a boat I'd want to do 60 in but it sure is solid in the low 40's!"
I agree, I am not saying 60 is practical.  Just having a little fun. Boat handles great all thru the 30's 40's and low 50's. You are probably right, aerodynamics are killing it. The console on mine is custom, modeled after a Fridgidaire then there is the t-top out there catchin wind. She was never made for the speed I am seeing now, but the hull has always been capable of speed. The wetted surface of this boat is not that different from the boats you mentioned. You probably already know this but, the steplift design as introduced by Ray Hunt on the Bertrams held quite a few records of endurance and speed. I am just proud to have what I have.
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#98
02-26-2011, 10:27 AM
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Fellas, Fellas, the fish don't swim that fast. I like to get there in good time too but it's a V20 not a bass boat. Once you reach 60 mph windage issues become a much larger part of the equation. The company I work for put Gas Turbine engines in go fast boats back in the years. One hull I can remember was a 43' Black Thunder. We put (2) 1400 hp turbines on surface drives, she ran 108 mph and would start trying to swap ends (turn around) after 95. The boat builder claimed the bottom was engineered for 75 mph. The person that pointed out, in the above post, that deep vee hulls will continue to climb out the water the faster you go is correct. Couple that with the windshield, height above the water, load and ever changing natural wind conditions could provide a recipe for a crash. The good thing is the stability issues will probably scare the crap out of the driver way before the hull loses its grip on the water. Remember fear and respect are still the best throttle. I have been 142mph in a Nortech 50' supercat with twin 1400 hp turbines, great ride, rock solid. But it demanded respect at that speed, I would be very careful and creep up on that 60 mph mark for a V20.
Calm winds, little other boat traffic and light on fuel is what I would look for. As a general rule for every 140 pounds of weight added to the boat you will lose 1 mph. That number is a little askew for a V20, it was part of a formula for much higher speed boats but brings attention to the weight vs. speed issue.
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#99
02-26-2011, 11:06 AM
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It's me again, my above reply may seem a bit out of place. I only read the first page of the thread then posted, not realizing there was ten pages more. (forum rookie mistake). I am glad to see the goals were achieved and no ill handling was had.
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#100
02-26-2011, 12:10 PM
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There is a gofast cat with turbines running around Barnegat Bay where I live. That thing is blazing fast. I got a few pics of it bafore it took off one day. I have been told it does 140+ mph
__________________
1981 V20 cuddy 2007 225 optimax http://budgetboattowing.com/ http://www.gardenstateyachtsales.com/
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