106 MPH Checkmate.......
#61
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Thanks Don, It has been a lot of fun! And for the non Believers.. for what it is worth.. It is true. It ran mid nineties on motor and 106mph (every time) on the hit. It was a 632 cubic inch engine that made 880hp normally aspirated and I was adding another 250hp of Nitrous. There was another one faster than me though. His name is Mathew Gilbert from Fairfax Va. he had a Checkmate 242 with a blower motor and spray that ran 112mph.
#62
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If you look carefully at those pictures you can see some of the tell tale signs of a fast performance v-hull:
1. The hull at speed has a near perfect running angle, attitude and stern lift which is what makes the running surface patch as small as possible and allows those kinds of speeds.
Less running surface in the water at speed lowers drag and allows higher speeds.
If any boater can set his good hull up to run like this at speed, he will always see better speeds than those who don't!
2. The tach shows an rpm of over 6500 rpms, so with good power and torque at that prop speed its possible to turn the prop fast enough with reasonable slip numbers to get a prop speed to move the boat at those kinds of speeds.
3. Not knowing items like hull lay up and coring and overall hull weights or interiors for overall boat weights, its a guess, but I would suspect this little boat is on the light side for a 27 foot V!
No crazy mad science or real secrets here, just good overall package engineering and build which can usually net these kinds of results in a good well designed v-hull performance boat.
Also keep in mind this package probably does not accelerate like a bat out of hell and could probably be a little tough to handle in rougher water conditions. Ultimate speed and top end performance is usually a series of tradeoffs used to acheive those kinds of results.
In any event , great job of putting together a nice performing v-hull speedster and if someone is looking to move into a small water rocket this could be great buy, provided you are also ready to spend a good dollar on the engine and drive package it takes to push this puppy that fast!
Best Regards,
Ray @ Raylar
1. The hull at speed has a near perfect running angle, attitude and stern lift which is what makes the running surface patch as small as possible and allows those kinds of speeds.
Less running surface in the water at speed lowers drag and allows higher speeds.
If any boater can set his good hull up to run like this at speed, he will always see better speeds than those who don't!
2. The tach shows an rpm of over 6500 rpms, so with good power and torque at that prop speed its possible to turn the prop fast enough with reasonable slip numbers to get a prop speed to move the boat at those kinds of speeds.
3. Not knowing items like hull lay up and coring and overall hull weights or interiors for overall boat weights, its a guess, but I would suspect this little boat is on the light side for a 27 foot V!
No crazy mad science or real secrets here, just good overall package engineering and build which can usually net these kinds of results in a good well designed v-hull performance boat.
Also keep in mind this package probably does not accelerate like a bat out of hell and could probably be a little tough to handle in rougher water conditions. Ultimate speed and top end performance is usually a series of tradeoffs used to acheive those kinds of results.
In any event , great job of putting together a nice performing v-hull speedster and if someone is looking to move into a small water rocket this could be great buy, provided you are also ready to spend a good dollar on the engine and drive package it takes to push this puppy that fast!
Best Regards,
Ray @ Raylar
#64
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Is a 242 Checkmate generally a pretty fast hull, sorta like how velocity's run fast without a ton of hp? what kinda speed do they run with 454 mags/502 mags when stock? The reason I ask is I was running along side a acquaintance at hot boat shoot out with my 272 Baja and I was clocking him somewhere between 83-85 or so on my GPS and he has a warmed over 454 mag with a m-1 running 8 psi of boost and its not tuned real great /he's not a motor guy at all and I would have guessed his top speed being a lot closer to 75-78. It took a m-3 on a 540 at 10-11 psi of boost to get my 272 into the mid 80's before I built my current package , Smitty
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I would not say that the 242 is a very fast hull as far a efficiency goes. I can tell you for a fact that it takes at least 700hp to go 85 mph. A stock 454mag (365hp) will go 65mph and for every mile per hour after that it will take you about 17 to 20hp. My 242 weighed 4800lbs. My guess is that there are more efficient hulls out there, But they are all very close with an exception of a few.
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Something fishy. The pick of the GPS and tach is with the key off. A 242 checkmate is NOT 26' or 27' long. I had a '98 253 with a procharged 502 and it was not stable @ 78 mph!! Maybe someone can crunch the numbers on what amount of power and what prop it would take to push it that fast and how long the drive would last. Also, it looks waaaaay too clean for a '97. 106 mph in a 24' boat not designed for those speeds......I don't believe it.
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Something fishy. The pick of the GPS and tach is with the key off. A 242 checkmate is NOT 26' or 27' long. I had a '98 253 with a procharged 502 and it was not stable @ 78 mph!! Maybe someone can crunch the numbers on what amount of power and what prop it would take to push it that fast and how long the drive would last. Also, it looks waaaaay too clean for a '97. 106 mph in a 24' boat not designed for those speeds......I don't believe it.
So, Pure Energy... Thank you for the compliment on how well I have taken care of my boat. The new owner is very happy about it too. Lenn
#69
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Something fishy. The pick of the GPS and tach is with the key off. A 242 checkmate is NOT 26' or 27' long. I had a '98 253 with a procharged 502 and it was not stable @ 78 mph!! Maybe someone can crunch the numbers on what amount of power and what prop it would take to push it that fast and how long the drive would last. Also, it looks waaaaay too clean for a '97. 106 mph in a 24' boat not designed for those speeds......I don't believe it.
Last edited by articfriends; 09-21-2013 at 04:48 PM.
#70
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I would not say that the 242 is a very fast hull as far a efficiency goes. I can tell you for a fact that it takes at least 700hp to go 85 mph. A stock 454mag (365hp) will go 65mph and for every mile per hour after that it will take you about 17 to 20hp. My 242 weighed 4800lbs. My guess is that there are more efficient hulls out there, But they are all very close with an exception of a few.