Can a single vee actually air completely out below 100 mph?
11-14-2007, 03:42 AM
#21
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Wow Smitty, truly amazing numbers. I think it is great reading about what you have done with your 272. High ninety´s must feel really special. As to the sensation you describe (and I´m only theorising here ´cos I ain´t been much past 80 in mine) I can only imagine that you are bringing the boat closer to the surface because your drive (and particularly the cavitation plate) is generating enough lift to raise the bow, whilst dropping the tabs a couple of clicks is lifting the stern. Those two are balancing out and the boat gains an extra inch of lift.
As the last few inches of the V disappears into a pad , there isn´t much left to give you directional stability.
I bet the rising sensation ties up with when you dropped the tabs. They couldn´t push the nose down because 1100 ponies were holding it high. The tail then followed.
Like I said, just plain theory, but it makes a good story.
Congrats on the baddest 272, and thanks for sharing all of your experience with us
As the last few inches of the V disappears into a pad , there isn´t much left to give you directional stability.
I bet the rising sensation ties up with when you dropped the tabs. They couldn´t push the nose down because 1100 ponies were holding it high. The tail then followed.
Like I said, just plain theory, but it makes a good story.
Congrats on the baddest 272, and thanks for sharing all of your experience with us
Last edited by articfriends; 11-14-2007 at 03:45 AM.
12-06-2007, 08:57 AM
#26
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I just found this thread, and am interested as i am a big fan of the ProCharger and anyone who takes the time to make em work and feel the power of a centrifugal is a friend of mine. My only tid bit is with a 32 @ 6200 my figures is that is about 22.6% slip at 97 MPH. Possible a different prop selection that would allow a slightly lower slip factor would net you the control you are looking for, and possible some speed. Also i would have to think a little bottom work would also help control issues. Just straightening whats there and the prior mentioned sharpening. The last boat i ran with ProChargers was a 33 Scarab it always went 100 + at will, but it too ran a little high slip factor near 17 % till i went with a set of Maximus ( Brett Anderson props ) and then the slip dropped to 11% and the speed shot up. and much better control throughout. I know, Iknow, twin engine boat not apples for apples just food for thought. I give you credit though, your Horsepower head is clearly a couple degrees advanced and running lean to want to take a 272 Baja to that excess.
12-08-2007, 12:41 AM
#27
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I stay away from 5 blades and low slip numbers,the boat just seems to work the best with high slip,sharp eye with the numbers though. Besides shearing off billet prop shafts the transom wants to lift and the boat ends up bow steering which is a little un-nerving. I am looking at trying some slight prop tweaking in the spring,Smitty
12-08-2007, 10:19 AM
#28
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I stay away from 5 blades and low slip numbers,the boat just seems to work the best with high slip,sharp eye with the numbers though. Besides shearing off billet prop shafts the transom wants to lift and the boat ends up bow steering which is a little un-nerving. I am looking at trying some slight prop tweaking in the spring,Smitty
12-08-2007, 11:00 PM
#29
Smitty ,
Contrats on those #'s !!! I must say you have got to have one of the all time most impresive sleepers. I don't meen that derogatory in any way. Its just that your boat just sitting at the dock.... if I didn't know any better & didn't know what kind of power you were running , well you know the rest of the story .......
Congrats again & dude thats very impresive ! Be safe bro...
Later , Scott
Contrats on those #'s !!! I must say you have got to have one of the all time most impresive sleepers. I don't meen that derogatory in any way. Its just that your boat just sitting at the dock.... if I didn't know any better & didn't know what kind of power you were running , well you know the rest of the story .......
Congrats again & dude thats very impresive ! Be safe bro...
Later , Scott
12-09-2007, 10:15 AM
#30
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Smitty,
The helmet sounds like a good idea. I have a Lifeline racing jacket hanging in my basement if you want to borrow it next time you chase that 100mph mark. I think the shorty gearcase would do it.
The helmet sounds like a good idea. I have a Lifeline racing jacket hanging in my basement if you want to borrow it next time you chase that 100mph mark. I think the shorty gearcase would do it.
