Sharpening props.

Easyrider · 27 May 2006, 13:58

Does anyone know if theres any gains to be had by sharpening the leading edge of the prop on a 30 hp.

RIVA · 27 May 2006, 14:34

yes it cuts the fishing lines better

Easyrider · 27 May 2006, 14:37

LOL-Theres plenty of them where i normally launch.

jwalker · 27 May 2006, 19:45

Don't do it. A smooth radiused edge is better.

Easyrider · 27 May 2006, 19:59

Quote:

Originally Posted by jwalker

Don't do it. A smooth radiused edge is better.

Why is that then?

My thinking is, if the blades have less resistance cutting through the water,there will be less power wasted through the drivetrain and more put more power into thrust.

What do the race boats use?

jwalker · 27 May 2006, 20:06

Because the boat has to operate efficiently at various speeds, the angle of attack of the blades will vary. A radius on the leading edge will present a better front to the water over a wider range of angles.

I've seen some race boat props what will, quite literally, slice your fingers. I'm not sure they are the best though.

Easyrider · 27 May 2006, 20:22

When you say radiused leading edge-do you mean the radius from the hub to the tip of the blade or a radius on the cutting edge(ie a blunt edge rather than a sharp one)

kk@decor82.fsne · 27 May 2006, 20:24

Sharpening your prop on your 30 hp yam will probably give you an extra 0.25 miles extra per hour !

jwalker · 27 May 2006, 20:40

Quote:

Originally Posted by Easyrider

When you say radiused leading edge-do you mean the radius from the hub to the tip of the blade or a radius on the cutting edge(ie a blunt edge rather than a sharp one)

Yep, a blunt edge rather than a sharp one.

Easyrider · 27 May 2006, 20:46

Ah ha- i see, i wont bother then.

Thanks for the replys fellas.