Results 41 to 59 of 59
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06-14-2011 02:16 PMGetting bad advice is unfortunate, taking bad advice is a Serious matter!!
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06-14-2011 03:09 PM
come on down Paul ,,we will have a great time ,,and i,m sure after a few beers ,,a great svl race will break out,, southweast air ,,,and LaQuinta ,,are ready ,,
IMCO #10- 2009 National Champions
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- Join Date
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- Georgetown, TX
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- 426
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06-14-2011 06:22 PM
Thank you the reply, I do appreciate it. What do you think you gained by the reduced aero-drag? I remember when Fountain started rounding the deck near the transom of his 40'/42' raceboats years ago. I was always wondering what really worked, how much faster it went as compared to the previous design. I am like a sponge when it comes to learning new perfromance improvements for boats, and I like to learn, even at 46 years of age.
I thought the bussel was mostly cosmetic, sio if in fact it reduces drag and increases top speed, I have learned something new today, and now appreciate the bussel much more than I previous did. Thanks again.
Stephen
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06-14-2011 06:45 PM
I would imagine as boats get faster and faster as much attention will have to be paid to aerodynamics as is paid to hydrodynamics
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06-15-2011 04:41 PM
Stephen ,,it would be hard to put a number on the bussell ,,what i,m trying to do is free up the boat ,by reducing the drag pockets ,,and in turn gain handeling responce,,which i hope will improve overall lap times,,,,their are a few hot spots on the hull and deck ,with an extreme amount of pressure at speed ,,so i have reduced ,,or even eleminated them ,by either ,,a vacume or pressure defuser application,,, i,ll try to keep you informed on how they work as i test next week some more ,,, hope this makes sense,,
,in racing ,,you either " follow and complain " or " lead and keep working "IMCO #10- 2009 National Champions
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06-16-2011 12:17 AM
Heads exaust no real speed gain but I have to put the good props on we'll see?
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06-16-2011 09:30 AM
what drive system are you running those rpms thru ?
IMCO #10- 2009 National Champions
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06-16-2011 04:52 PM
Last edited by osur866; 06-16-2011 at 05:39 PM.
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06-16-2011 06:29 PM
thats awsome ,,good job ,,please let us know the final #.s ,,i,m always open and looking for the new next speed moves,,thanks George Jr.
IMCO #10- 2009 National Champions
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06-16-2011 07:54 PM
George,
Couple things to take into account here, 1st its a 3200 lb boat running a pretty deep propshaft height (5 1/2") even with the -2", it's been the opinion of some that spinning a larger prop slower is more efficent than turning a smaller prop faster, I do believe this to account for my pretty low slip #'s with running the 3 blades, hence why I'm trying to stay with the 1.65 upper gears, could the boat benefit from a -3" lower and possibly a extension box? Yes I think it could, but then again just how fast does one need to go in an 18' boat anyway??
SteveLast edited by osur866; 06-16-2011 at 08:03 PM.
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06-16-2011 10:35 PM
man what a great looking set-up,,,i agree with the 3 and 4 blade for top end speed ,,i would do the same for kilo runs in my boat ,,, but in racing i need to accelerate to turn one and off each corner ,,thats why i stayed with 6 blades ,,while most turned 5,,
I have an 18 CHAMP which i,m going to start to restore in the next few months,,it looks like i,ll smallblock it with an IMCO ,, i like the 1.65 gears your running ,,might copy !IMCO #10- 2009 National Champions
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06-16-2011 11:12 PM
Don't exactly understand your question, but is the boat stable? That's all relative, it's defiantly a drivers boat, if you just sit in the drivers seat and do nothing but give it throttle and a lil trim then yeah she's gonna get your attention real quick!! Yes it has a tendency to chine walk if you let it, starting in the low-upper 70's and is pretty soild into the low 80's it can be controlled by counter steering, at wot I don't use any tabs they are high and dry and it doesn't require much trim not more than 1/4 for best speed, but im using 3 blade bow lifting props, boat DOES NOT like 4 blade props too much stern lift which makes it pretty loose! Keep in mind it's a 24* bottom but it does have a rounded keel, so the higher the stern rides the more it wants to chine walk and it really becomes a balancing act to keep the rounded keel from falling from one side to another which induces the chine walk. 4 blades and over trimming all have a great effect on it, it's very sensitive to trim/tab input!
But no it's not as stable as a 30 something twin when running at same speeds up to 70 it's rock soild anything after is when you need to be on your game and really driving the boat!
George with the 1.65's the acceleration will be much better than a 1.5 gear.
What kinda power are considering for your champ? If your keeping it below 400 I'd consider finding an Alpha SS they are shorter with less hydro drag account a much smaller case some of the other Donzi guys with 16/18's have had great success with those.
SteveLast edited by osur866; 06-16-2011 at 11:55 PM.
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06-19-2011 09:30 AM
Didnt have to do much this year, gonna try new prop and did drop a few pounds of my hefty azz LOL! last gps was 88. laser prop wouldnt hold anymore. Raised X 2" since then. Should be over 90 if I can find that money tree to get sum fuel
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