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Originally Posted by Brad Christy
(Post 4862625)
Checkmate,
Not knowing anything about your hull, and just going buy weight, I’m betting you’ll bury the rev limiter with a B28. Keep your eye out. A B28 just popped up and sold here on OSO. Post in the “Wanted” section you’re looking for one. You might be surprised. One more thing…. I hope you upgraded the outdrive…. Thanks. Brad. (937)545-8991
Originally Posted by Gimme Fuel
(Post 4862648)
I hope you installed external hydraulic steering! It will be a must in a small hull with that power level. Will be very hard to control any chine walk and properly balance the hull on the keel without it.
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Originally Posted by Brad Christy
(Post 4862666)
SB,
I had a B26 on our PQ while the injectors were giving us fits. After getting them straightened out, we took the boat to the lake to test them out. I couldn't get much above 2/3, maybe 3/4 throttle without bumping the rev limiter. When I reacquired a B28, I can now bury the fun stick and the engine loads out right at 5K RPM. I'd much rather not be able to use the top end of the throttle range because my knuckles can't get any whiter, rather than because I'm afraid of a rod through the side of the block. Just sayin'... :ernaehrung004: I didn't catch that the OP had upgraded to a Bravo drive. I thought he was still running the Alpha. All good. Thanks. Brad. (937)545-8991 |
Originally Posted by CheckmateScarab
(Post 4862675)
I'd rather have a bit too little prop than too much when starting out, glad to hear the b28 is working in your situation. I'll start with one of those and go from there. May very well end up with a 30 or 32 depending on how it spins
Yup. Creeping up on it is definitely a wise approach. There are those who might suggest you've got more HP than the hull can handle. I call BS on that. I grew up on a 21' Nordic daycruiser with a 482/6-71/V-drive that my dad affectionately call the "Homesick Angle". It would easily plane off at 2200RPM and could maintain plane at 1900. At 6200 RPM, we were tickling 85MPH and running about as dry as a boat has any right to. Your numbers are going to be different, but I think you're gonna be in that same realm. It's gonna be a hoot. You built all those HP. Now ya gotta load 'em up. I'm betting you're going to spin a B28 like it ain't even in the water. Curious to see how it goes and where you end up. Thanks. Brad. (937)545-8991 |
Originally Posted by Brad Christy
(Post 4862678)
Checkmate,
Yup. Creeping up on it is definitely a wise approach. There are those who might suggest you've got more HP than the hull can handle. I call BS on that. I grew up on a 21' Nordic daycruiser with a 482/6-71/V-drive that my dad affectionately call the "Homesick Angle". It would easily plane off at 2200RPM and could maintain plane at 1900. At 6200 RPM, we were tickling 85MPH and running about as dry as a boat has any right to. Your numbers are going to be different, but I think you're gonna be in that same realm. It's gonna be a hoot. You built all those HP. Now ya gotta load 'em up. I'm betting you're going to spin a B28 like it ain't even in the water. Curious to see how it goes and where you end up. Thanks. Brad. (937)545-8991 |
Doubtful. Most likely your drive is deep in the water. Most small boats with Alfalfa’s where. This is assuming you didn’t raise drive height when you installed Bravo. Or did you ?
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Originally Posted by SB
(Post 4862853)
Doubtful. Most likely your drive is deep in the water. Most small boats with Alfalfa’s where. This is assuming you didn’t raise drive height when you installed Bravo. Or did you ?
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5 blade is typically for high x dimension when a 4 blade is not grabbing enough water and slipping. Small performance boats don't usually need a lot of blade area. Many run 3 blades also.
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Originally Posted by SB
(Post 4862877)
5 blade is typically for high x dimension where a 4 blade is not grabbing enough water and slipping. Small performance boats don't usually need a lot of blade area. Many run 3 blades also.
This.... On our Rinker 236 we had before the PQ280, we bought it with a 22P 4B of some unknown make that had been reworked to 21P. The boat rode really wet, and maxed out at about 51MPH. We switched to a 23P 3B of an unknown make (it was an even "try it, keep it if you like it" swap) and the boat came alive. It rode on it ass like it was supposed to and topped out at 60MPH even. You might try a Mirage Plus 27 or 29P. I'm still betting you'll be over 30P before the engine is happy. Thanks. Brad. (937)545-8991 |
Spot on, props :lolhit: to you both for chiming in - a few market places have a testing period that I'll take advantage of. Starting with a 28 4 blade and potentially moving to a 30 or 32 as needed. Maybe in the future my curiosity will get the best of me and mess with a 5 blade to see what happens for ****s and giggles
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Checkmate,
It's a solid hob, but it is a cheap test for a 3B prop. Mercury Marine Mirage Plus 48-821720 a50 29p | eBay Thanks. Brad. (937)545-8991 |
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