Engine Performance

[Gerry Zagorski]

Originally Posted by Capt. Frank

Gerry,

I'd vote elsewhere given his symptoms. Hub speed this consistent?

The more times it spins free of engine-to-prop the less friction the hub has left for the next time it happens. And progressively slippage gets worse.

And during a hub slippage it emulates cavitation where prop thrust speed would drop off to near 0. He's maintains consistently 3 knots slower?

Could it be as simple as his GPS was knots v mph on the read out? Perhaps.

I think we both agree it's not the powerhead.

Some good observations there Frank although I think I only understood about half of what you said

Definitely not the power head though....

[Down The Hatch]

I thanks both of you for your advice. I will remove the prop in the spring and get to the bottom of this. Love the site. You have been very helpful

[Capt. Debbie]

Gerry it's funny. We are both throwing our best deduction out there on this. A good thing for the thread.

But I bet we are missing some key fact or two that would make the culprit a "no brainer." Betcha.

Originally Posted by Gerry Zagorski

Some good observations there Frank although I think I only understood about half of what you said

Definitely not the power head though....

[Gerry Zagorski]

Yes sir.... Something's not adding up here.