Posted by ken on July 06, 19103 at 12:07:16:
In Reply to: Re: rampage posted by jac v d heuvel on July 06, 19103 at 10:35:10:
: : : Does anyone know what sise of propellor need for my rampage i use a converted engine from a chevrolet caprice 1978 the gear ratio is 1:1
: : : jac v d heuvel
: : : the netherlands
: :
: : The weight and horsepower has to be known to figure the prop size. Note whether the numbers are metric or english.
: the engine delivers about 150 hp and the weight is 1150 lbs
At 1150 lbs and 150hp you get 8lbs per hp. That should yield about 60knots. I used 4500rpm and got 12x16 prop.
Have you figured weight for tanks, gear and persons? I also figured at 1500 lbs and 150hp to get 10lbs per hp. At 4500 rpm I got a 12x15.
An inch of diameter is about equal to 2 inches pitch (for same engine loading) so a starting point could be a 12x15 or a 11x17. If the top RPM is different than 4500, post your top RPM.