why wouldn't i put a five blade prop on my forty plus
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why wouldn't i put a five blade prop on my forty plus
i have an efpwl which i have been told may be the wrong engine for my 10'-12' ply folding hull that i am building, wrong perhaps because its too long, i can get around that, in a number of ways, but possibly wrong because it is too powerfull. if i were to put a five blade prop on it given the size of the fairly (i hope) lightweight hull would it go faster or run slower, stall or overheat. i'm sure seagull put a lot of thought into their power units and drives but they didn't tell me about it, and i've every intention of having the fastest racing seagull / folding boat combination in the wor..... birmingham
prop size
The Seagulls were never designed to exceed the displacement speed of the boats, so for a 2.5 metre boat, measures at the Waterline you would only need 2.5 hp to get it to it's top speed of 2.5 knots.
This formula works well enough for all displacement boats up to 30ft. After that you need to use the square root of the WL length in feet, multiplied by 1.4! Get the same result just looks more scientific!
To make it go faster you have to overcome the displacement speed 'hump', that is climb up your own bow wave and skit along on top of the water instead of through it.
Fitting a Century prop will just slow the motor and you. If you really want this boat to plane you aught to be thinking of a 6 to 10 hp motor. Assuming the hull is the right shape you will easily plane!
The motor you have needs a 20" high transom, or the motor will be far too deep into the water.. that will cause power loss and bad starting too.
Bet the manufacturer has fitted a label stating the max power though and I bet it is 2 or 3 hp!.
You might end up folding yourself inside a very small space with an angry Seagull! not to be recomended!
This formula works well enough for all displacement boats up to 30ft. After that you need to use the square root of the WL length in feet, multiplied by 1.4! Get the same result just looks more scientific!
To make it go faster you have to overcome the displacement speed 'hump', that is climb up your own bow wave and skit along on top of the water instead of through it.
Fitting a Century prop will just slow the motor and you. If you really want this boat to plane you aught to be thinking of a 6 to 10 hp motor. Assuming the hull is the right shape you will easily plane!
The motor you have needs a 20" high transom, or the motor will be far too deep into the water.. that will cause power loss and bad starting too.
Bet the manufacturer has fitted a label stating the max power though and I bet it is 2 or 3 hp!.
You might end up folding yourself inside a very small space with an angry Seagull! not to be recomended!