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Hi Dan.
You wrote below......
"The surface craft needs a faster prop speed just to travel through the
water and additional
speed to produce thrust. The slower moving sub needs less prop speed to screw through the water and additional speed to produce thrust. By now I'm sure most of you are thinking, but the surface boat uses a different pitch prop. True! A faster moving boat uses a prop that has a long lead, more pitch. For one turn of the prop it is designed to screw farther through the water then a slower moving boats prop. This is taken into consideration with propelling a sub. Any slow moving craft has a flatter prop then a fast moving craft. If the pitch of the prop were all the same the fast boat wound need a zillion RPM and a subs props would be turning extremely slow." You got me to thinking. I have a two man wetsub and
a 74lb thrust minnkota motor with the 11 inch Minnkota weedless wedge
prop.
Is that prop going to be ok for use on my sub since
it is designed for being a surface craft trolling motor? Do I need a
prop
with a different pitch?
When you were explaining about how a surface craft
needs a different prop from a sub it got me to thinking if I might
need
to get another prop for my sub.
Kindest Regards,
Bill
Akins. |