[Rhodes22-list] Centerboard Drag and 6hp Speed

[ROGER PIHLAJA]

Hi Lee,

S/V Dynamic Equilibrium came with an Evinrude 6 bhp long shaft outboard.  It was OK; but, when it came time to replace it, I opted for an extra long shaft Honda 8 bhp.  The 6 bhp outboard was plenty powerful enough to power the boat against any headwinds.  But, with the wind come waves and the 6 bhp long shaft Evinrude would frequently cavitate.  The extra long shaft Honda was a significant improvement.  If an extra long shaft 6 bhp outboard had been available, I would have considered it.  All the power in the world is of no use if you can’t couple it to the water.  Attached is a photo of the stern of my boat with the motor mount in the fully lowered position.  Note how the prop is well below the waterline.

[cid:image003.jpg at 01D8897B.1DDD8870]

Roger Pihlaja
S/V Dynamic Equilibrium


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From: Lee Kuhn<mailto:lvjkuhn at gmail.com>
Sent: Sunday, June 26, 2022 9:48 AM
To: The Rhodes 22 Email List<mailto:rhodes22-list at rhodes22.org>
Subject: [Rhodes22-list] Centerboard Drag and 6hp Speed

1.  I was motoring around the lake the other day trying to get the ten
hours of break-in period on my new outboard.  That's a lot of motoring when
I could have been sailing.  I was going 3.5 mph with the diamond
centerboard in the up position.  I lowered the board and it slowed me down
to 3.4 mph.  May not be surprising to a lot of you but I'd thought it would
have slowed the boat down morre.

2,  My old motor was a 9.9hp.  I thought that a 8hp would be ideal for our
boats but I went down to a 6hp because of the weight difference,  Not sure
if I can manhandle the smaller engine on and off the boat but I can
probably find some kid who can.  At slightly less than one third throttle
the Tohatsu long shaft moved the boat at 5.1 mph in calm waters.  It will
be interesting to see what it can do in a strong headwind.

Lee
1999 Rhodes22  AT EASE
Claytor Lake, VA

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