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Old 03 April 2009, 17:52   #41
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Quote:
Originally Posted by gstamo View Post
What size of propeller do you think is right (lets say for 30hp, and 2 people load)
Depends on the gear ratio and max rpm of the engine, but with the 30hp yam (gear 1,85:1 and max rpm 5500) I would say try something like 13" pitch.
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Old 29 June 2009, 05:09   #42
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trouble getting the rear out of the water

Hi, just got mysle fa futura M2 HD ( 3,6m) with a honda 20pk 4 stroke engine. I had a futura back in the 80's with only a 10pk 2 stroke engine and that thing rocked.. Now this boat with a 20pk has trouble getting it's rear out of the water.. hence it is making a lot of water in the back and doesn't come up to speed at all. The engine is equied with a standard of factory prop and i am considering to try a power trust kit. The engine is on maximum trim... closest to the boat. I don't have any console to drive it, i'm sitting on the tube hand steering it. total weight on board is about 210 kilo ( 2 kids each 35 kilo, fueltank about 25 kilo and myself.. yes.. 120 kilo..:-) )

Does anyone have tips for me? Or shoud i go for a 30pk engine instead?

Marco
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Old 29 June 2009, 09:29   #43
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Sounds like a 20 hp 4 stroke is simply too heavy for a boat of that length. What are the chances of finding a good used 2 stroke?
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Old 29 June 2009, 14:51   #44
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Quote:
Originally Posted by mberkhey View Post
Hi, just got mysle fa futura M2 HD ( 3,6m) with a honda 20pk 4 stroke engine. I had a futura back in the 80's with only a 10pk 2 stroke engine and that thing rocked.. Now this boat with a 20pk has trouble getting it's rear out of the water.. hence it is making a lot of water in the back and doesn't come up to speed at all. The engine is equied with a standard of factory prop and i am considering to try a power trust kit. The engine is on maximum trim... closest to the boat. I don't have any console to drive it, i'm sitting on the tube hand steering it. total weight on board is about 210 kilo ( 2 kids each 35 kilo, fueltank about 25 kilo and myself.. yes.. 120 kilo..:-) )

Does anyone have tips for me? Or shoud i go for a 30pk engine instead?

Marco
its not a shortshaft motor you have is it ? , not sure what you mean by making lots of water at the back but sounds like your prop may not be in the water far enough ??
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Old 29 June 2009, 17:04   #45
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it's a short tale engine. the boat is build to carry a 30pk 4 stroke engine with a short tale. Could it be that the angle (trim) isn't good? should the angle look like this: |\ or like this: |/ to lift the engine out of the water? I would think that it should be like |/ but i talk to people who tell me the opposite.
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Old 29 June 2009, 17:11   #46
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Weight distribution makes a big difference as does trim.

Try getting the passengers to move right up to the front - when the boat is planing gradually move backwards.

You need to trim out not in if it is struggling when it is on the plane.
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Old 29 June 2009, 18:06   #47
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My futura had a long shaft engine ,i thought they all required a long shaft ??
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Old 30 June 2009, 04:52   #48
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ok.. trimming out could solve it then plus the weight distribution. Thanks for the tips. I will try them out tonight when i get home.
on the short tale.. you are right most futuras need a long tale but there is just 1 that needs a short one and thats the 3,6 meter one i have.

I'll keep you all posted on the progress.

ps. does any one have experience with installing the power trust kit? Does it add a lot of power and if so is this translated in speed or just pure force?
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Old 30 June 2009, 13:25   #49
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Old 30 June 2009, 16:06   #50
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Quote:
Originally Posted by mberkhey View Post
ok.. trimming out could solve it then plus the weight distribution. Thanks for the tips. I will try them out tonight when i get home.
on the short tale.. you are right most futuras need a long tale but there is just 1 that needs a short one and thats the 3,6 meter one i have.

I'll keep you all posted on the progress.

ps. does any one have experience with installing the power trust kit? Does it add a lot of power and if so is this translated in speed or just pure force?
Before installing things like a power trust kit... Make sure your engine's anti-ventilation plate (that thing above the prop) is at the same height as your boat's bottom line. I think that causes the problem you have (engine is too low at the moment). You can test it by putting a piece of wood or metal between the bracket and the transom.

Next: try to trim up the engine a bit, it will give you more bowlift and speed.
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