Posted on June 23, 2010.
Airboat propeller pitch? My fire department of a boat with air that is used for diving and water rescue. We have difficulties to get the boat to rise above the water. The body having the boat that has replaced the wooden propeller with a carbon fiber (?) From the propeller so it is unclear whether the propeller has been properly adjusted for our boat. The boat ~ 1986 Chevy 350, which currently amount to about 4500-5000 rpm. Would lower the pitch of the propeller causes the engine to run at high rpm thus greater speed, or decreasing the depth will be up to cancel the effect of higher RPM?
It looks like you may be a little less effort, you must keep the engine at 4500 rpm
If you look at the specifications below, you will see that the maximum torque is at 3600 rpm which is the maximum rotational force produced. Max horse power is only 700 rpm higher, you're dealing with very narrow power band,
I if this is an accessory Adjustable increase the pitch a bit.
7.5 1985
350 cubic inches 4.00 "Bore, 3.47" stroke
Compression ratio 8.5:1.
rpm 250 hp @ 4300
350 pounds feet of torque at 3600 rpm
In my opinion, you should increase the pace on the proposal. More pitch will give the boat more power and allow him to obtain "the hole" and plan. When in place on the plane, there will be less friction and therefore you will have more speed.
