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Author Topic:   reduction methods of roostertail?(help)

s_calhor posted 07-31-2005 03:49 AM ET (US)
HI
And thank you for your attention.we have an 14 meter high speed craft with 2(650 hp) engines and 2 propulsion system, every one on the one of the engines and (2) surface piercing propellers( super cavitation propellers)a kind of astern lift propeller type.we have some problems with our boat in the high speed mode , the problem is the very high roostertail at the aft part of boat .if possible help us for reduction height and amount of the roostertail , with description of methods, affects of this method to the other boats parameters, person or company how applied this method for first time ,and etc.
Thanks and
Best regards
S.Calhor

Plotman posted 07-31-2005 10:47 AM ET (US)
Uh, this is a Boston Whaler forum. Not many 45 foot Whalers with 1350 hp on them. I think you need to try elsewhere.
BOB KEMMLER JR posted 07-31-2005 04:47 PM ET (US)
Dude roostertails are mega FUN!!!I suggest you find as many crowded bridges as you can and let er eat as you go under them. ;o)
Robob2003 posted 08-01-2005 03:14 PM ET (US)
If you have Arneson drives rooster tails are a fact of life.
try [url]www.arneson-industries.com/[url/]
Bob on Tampa Bay
Robob2003 posted 08-01-2005 03:16 PM ET (US)
Let's see if I can get it right this time.
www.arneson-industries.com/
Bob on Tampa Bay
Buckda posted 08-01-2005 03:32 PM ET (US)
A nice 22' Boston Whaler Outrage with 250 HP motor throws a very nice and modest rooster tail. The engine is relatively quiet also, meaning that folks in other boats AND those on shore can enjoy their own activities instead of being distracted, or worse, interrupted, by ... well I digress...
This is going to come out as pretty rude, but I can't help but wonder how you came to the decision to post this particular question here (on this forum)? This is clearly a site about Boston Whaler boats. None that I know of have surface piercing drives. I don't even know of any boat that utilizes these drive units which might be a candidate for having a small Whaler as its tender. The only possible link I can come up with is that you use a 9' Boston Whaler tender to row out to the mooring on which you keep the boat in question.
Asking this question here, while possibly getting a coherent response from someone here who also owns or has had experience with a boat similar to yours is akin to asking your ASE certified mechanic at your local Ford dealership how to fix the main rocket booster on the Space Shuttle. It is possible he might concievably come up with a solution, but more likely that he just doesn't know because he has little or no experience servicing that kind of engine.
Just curious...seems like you'll get a more helpful and/or authoritative response from another site that is dedicated or caters to folks with similar equipment.
Marsh posted 08-01-2005 09:00 PM ET (US)
I can't help you with your rooster tail...but I DID stay at a Holiday Inn Express last night...
Marsh
bsmotril posted 08-01-2005 10:36 PM ET (US)
A bow lifting prop with more rake will generate a lot less tail than a stern lifting prop will. The thrust force cone on a bow lifter is narrower, less prop wash going up in the air. BillS

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Author	Topic: reduction methods of roostertail?(help)
s_calhor	posted 07-31-2005 03:49 AM ET (US) HI And thank you for your attention.we have an 14 meter high speed craft with 2(650 hp) engines and 2 propulsion system, every one on the one of the engines and (2) surface piercing propellers( super cavitation propellers)a kind of astern lift propeller type.we have some problems with our boat in the high speed mode , the problem is the very high roostertail at the aft part of boat .if possible help us for reduction height and amount of the roostertail , with description of methods, affects of this method to the other boats parameters, person or company how applied this method for first time ,and etc. Thanks and Best regards S.Calhor
Plotman	posted 07-31-2005 10:47 AM ET (US) Uh, this is a Boston Whaler forum. Not many 45 foot Whalers with 1350 hp on them. I think you need to try elsewhere.
BOB KEMMLER JR	posted 07-31-2005 04:47 PM ET (US) Dude roostertails are mega FUN!!!I suggest you find as many crowded bridges as you can and let er eat as you go under them. ;o)
Robob2003	posted 08-01-2005 03:14 PM ET (US) If you have Arneson drives rooster tails are a fact of life. try [url]www.arneson-industries.com/[url/] Bob on Tampa Bay
Robob2003	posted 08-01-2005 03:16 PM ET (US) Let's see if I can get it right this time. www.arneson-industries.com/ Bob on Tampa Bay
Buckda	posted 08-01-2005 03:32 PM ET (US) A nice 22' Boston Whaler Outrage with 250 HP motor throws a very nice and modest rooster tail. The engine is relatively quiet also, meaning that folks in other boats AND those on shore can enjoy their own activities instead of being distracted, or worse, interrupted, by ... well I digress... This is going to come out as pretty rude, but I can't help but wonder how you came to the decision to post this particular question here (on this forum)? This is clearly a site about Boston Whaler boats. None that I know of have surface piercing drives. I don't even know of any boat that utilizes these drive units which might be a candidate for having a small Whaler as its tender. The only possible link I can come up with is that you use a 9' Boston Whaler tender to row out to the mooring on which you keep the boat in question. Asking this question here, while possibly getting a coherent response from someone here who also owns or has had experience with a boat similar to yours is akin to asking your ASE certified mechanic at your local Ford dealership how to fix the main rocket booster on the Space Shuttle. It is possible he might concievably come up with a solution, but more likely that he just doesn't know because he has little or no experience servicing that kind of engine. Just curious...seems like you'll get a more helpful and/or authoritative response from another site that is dedicated or caters to folks with similar equipment.
Marsh	posted 08-01-2005 09:00 PM ET (US) I can't help you with your rooster tail...but I DID stay at a Holiday Inn Express last night... Marsh
bsmotril	posted 08-01-2005 10:36 PM ET (US) A bow lifting prop with more rake will generate a lot less tail than a stern lifting prop will. The thrust force cone on a bow lifter is narrower, less prop wash going up in the air. BillS