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Posting a reply to: Honda 50 - Damaged Prop - High RPM's

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[QUOTE]Makintrax73 - 8/19/2009  11:10 AM

Hey guys, I recently purchased a used boat.  It's a Sea Nymph FM161 with a BF50A Honda 4 stroke.  The boat is 16.4' x 72" side console aluminum boat.

I took it out for a trial run.  With just me in the boat it would hit 6,000rpm before full throttle was reached - maybe 3/4 or 7/8 of full throttle.  According to the "Honda" tach in the boat (which I assume was installed along with the motor) redline is 6,000 rpm.  Current prop is a "Scott" 11 1/4 x 13.

Normally I would think the thing to do is move up in pitch to bring down RPM.  The problem is that the prop is damaged.  The tips of all 3 blades are sheared off around 1/8" or 3/16" and all dinged up.

So my problem is I don't know if I put a new 13 pitch prop if that will bring the RPM down off redline, or should I get a 14 pitch prop and assume the prop damage is not effecting RPM very much?  On a budget and only want to buy one prop.

Thanks guys.

Edit - Speedo showed around 30mph on the trial run.[/QUOTE]

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Makintrax73

Posted 8/19/2009 11:10 AM (#394883)
Subject: Honda 50 - Damaged Prop - High RPM's

Posts: 156

Hey guys, I recently purchased a used boat. It's a Sea Nymph FM161 with a BF50A Honda 4 stroke. The boat is 16.4' x 72" side console aluminum boat.

I took it out for a trial run. With just me in the boat it would hit 6,000rpm before full throttle was reached - maybe 3/4 or 7/8 of full throttle. According to the "Honda" tach in the boat (which I assume was installed along with the motor) redline is 6,000 rpm. Current prop is a "Scott" 11 1/4 x 13.

Normally I would think the thing to do is move up in pitch to bring down RPM. The problem is that the prop is damaged. The tips of all 3 blades are sheared off around 1/8" or 3/16" and all dinged up.

So my problem is I don't know if I put a new 13 pitch prop if that will bring the RPM down off redline, or should I get a 14 pitch prop and assume the prop damage is not effecting RPM very much? On a budget and only want to buy one prop.

Thanks guys.

Edit - Speedo showed around 30mph on the trial run.

Edited by Makintrax73 8/19/2009 11:12 AM