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The Lavatory Man

relax And join me in a brown-one as we lissen two my Latest song ...

http://www.littleboxes.nl/LavatoryMan.htm

love From yoar old freand 14

Aug 10
1976-1983 JOHNSON SEAHORSE 90 HP MOTOR.

I SPUN THE ORIGINAL PROP AND HAVE SEVERAL OLDER SPARES.

I HAVE LOST SPEED AND CAN NOT PLANE ANYMORE.

WHAT SIZE PROP SHOULD I USE.

I USED TO DO 22MPH AT 4K RPM.

NOW I CAN ONLY DO 15MPH AND AT 3K AND THE BOAT WILL NOT PLANE.

MY THREE SPARE PROPS ARE ALL SMALLER THAN THE STOCK PROP.

IT WOULD BE GREAT TO DO MORE THAN 22MPH..

SONOFADOCKER@YAHOO.COM

Aug 9
This is the most information I have ever recieved. 90% percent of the rec boat users are wasting time with political novels and racial rantings..... I will look for a X prop the same size as the original. the boat did 22mph at 4200-4400 rpm Now it will do 17mph at 3000 rpm and will not plane. That was using an old prop that was under the bow for years.
Aug 11
The original prop for that engine was 14"X13p.

That's the original recommendation.

That doesn't mean that's what you had based on what you stated.

In theory, at 5K , which is in the middle of the operating range for WOT, with the original prop, you should be doing something nearer to 40 mph.

If you have the prop you spun, look in the exhaust side and the size and pitch will be stamped on the hub. That will tell you what you had. (Sometimes, the size and pitch will be stamped on the prop itself - you might have to look around for it). Then you can compare the prop you had to what was spec'd for it originally.

It would help to know the size and type of boat.

Short
Aug 11
Try em all. Calif
Aug 9
well considered thoughts to the readers of rec.boats:

(1) STOP YELLING! Hit the caps lock key so you won't look like such a newbie.

(2) Simple solution. Go trade the three junk props in for a brand new prop just like the one you spun.

See here, too: http://continuouswave.com/cgi-bin/propcalc.pl/

Gene
Aug 10
   

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