Perfect Pitch Propellors
- Thread starter bendyone
- Start date
GeorgeLlewellin
Well-Known Member
bendyone
Well-Known Member
Yes but look at the cost differance.
GeorgeLlewellin
Well-Known Member
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"Yes but look at the cost difference."
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I agree they are expensive but I believe they are the best, giving fuel economy and/or increased speed, just because the pitch is always right. Going up and over large waves in a seaway is a bit like going up and down hill in your car, you wouldn’t do that without changing gear.
They should also be a great help going astern because they reduce prop walk and increase thrust astern. There is also the increase braking effect.
If there are others out there that have found problems with the Autoprop I for one, would be very interested to read about them.
Cheers, George.
"Yes but look at the cost difference."
________________________________
I agree they are expensive but I believe they are the best, giving fuel economy and/or increased speed, just because the pitch is always right. Going up and over large waves in a seaway is a bit like going up and down hill in your car, you wouldn’t do that without changing gear.
They should also be a great help going astern because they reduce prop walk and increase thrust astern. There is also the increase braking effect.
If there are others out there that have found problems with the Autoprop I for one, would be very interested to read about them.
Cheers, George.
kengill
Well-Known Member
I always worry about suppliers who refer to the shapes of their propellors as "Aerofoils".
They apparently lack the wit and technical education to understand that a marine propellor has a hydrofoil section 'cos "Aero" refers to things in air and "Hydro" refers to things in water.
I quote from Encyclopedia Brittanica
"shaped surface, such as an airplane wing, tail, or propeller blade, that produces lift and drag when moved through the air. An airfoil produces a lifting force that acts at right angles to the airstream and a dragging force that acts in the same direction as the airstream. "
and from Merriam Webster On-Line we get
" a body similar to an airfoil but designed for action in or on water " for the definition of a hydrofoil
Me? I'm perfectly happy with my conventional hydrofoil section folding prop with which my engine runs at 100% of manufacturer's specified rpm when at maximum displacement speed
They apparently lack the wit and technical education to understand that a marine propellor has a hydrofoil section 'cos "Aero" refers to things in air and "Hydro" refers to things in water.
I quote from Encyclopedia Brittanica
"shaped surface, such as an airplane wing, tail, or propeller blade, that produces lift and drag when moved through the air. An airfoil produces a lifting force that acts at right angles to the airstream and a dragging force that acts in the same direction as the airstream. "
and from Merriam Webster On-Line we get
" a body similar to an airfoil but designed for action in or on water " for the definition of a hydrofoil
Me? I'm perfectly happy with my conventional hydrofoil section folding prop with which my engine runs at 100% of manufacturer's specified rpm when at maximum displacement speed
beneteau_305_553
Well-Known Member
Yep
I'm planning to fit one.
Won't be in the water till late april though.
I'm planning to fit one.
Won't be in the water till late april though.
najsmith
Well-Known Member
Most people seem to be going for KIWI's - shich I have to admit I would if :
a) I was a racer/long distance cruiser
b) Had £750+Vat spare for a Prop
c) Boat was longer than 28'
a) I was a racer/long distance cruiser
b) Had £750+Vat spare for a Prop
c) Boat was longer than 28'
bendyone
Well-Known Member
Got to look at the costs, I like the idea of a plastic prop that flexes to give the best pitch under different conditions.
Cost is $250 + $22 for postage.
Cost is $250 + $22 for postage.
