Sharpening props.

[Easyrider]

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

[RIVA]

yes it cuts the fishing lines better

[Easyrider]

LOL-Theres plenty of them where i normally launch.

[jwalker]

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

[Easyrider]

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]

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]

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]

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

[jwalker]

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]

Ah ha- i see, i wont bother then.

Thanks for the replys fellas.