kitjv
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Bolt-On Anti-Cavitation Plates
Realistically, are there any significant benefits to adding a bolt-on anti-cavitation plate to a Honda 20HP outboard used on a 12-ft. inflatable boat?
If so, why don't outboard manufacturers design their motors accordingly>
Thank you for your thoughts.
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Hook
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I have used them on smaller o/bs or lighter boats and I think they make a significant difference. They might cost you a mph or two off the top end but
they make up for it in quicker planing and more efficient operation at low-mid speeds.
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comitan
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I have made and used them for years, the reason I make my own is that the ones you buy are not large enough or long enough. On your short boat they
would make a big difference, you would plane faster and be able to hold onto a plane at a slower speed.
[Edited on 7-1-2007 by comitan]
Strive For The Ideal, But Deal With What\'s Real.
Every day is a new day, better than the day before.(from some song)
Lord, Keep your arm around my shoulder and your hand over my mouth.
“The sincere pursuit of truth requires you to entertain the possibility that everything you believe to be true may in fact be false”
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Bob and Susan
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under 90 hp they work great
over 90 hp not needed
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vandenberg
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| Quote: | Originally posted by comitan
I have made and used them for years, the reason I make my own is that the ones you buy are not large enough or long enough. On your short boat they
would make a big difference, you would plane faster and be able to hold onto a plane at a slower speed.
[Edited on 7-1-2007 by comitan] |
Wiley,
What material did you use? Maybe another picture or two. Have a 75 without one ,but I know they make a difference.
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comitan
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The material is aluminum 3/16 I believe, I do have one I made for my 18' Seaswirl with 140HP IO that was to small, its probably to wide a cutout in
the center for an OB even the seaswirl will plane faster and keep a plane at a very low RPM. The ones I have all look alike just different in size.
Strive For The Ideal, But Deal With What\'s Real.
Every day is a new day, better than the day before.(from some song)
Lord, Keep your arm around my shoulder and your hand over my mouth.
“The sincere pursuit of truth requires you to entertain the possibility that everything you believe to be true may in fact be false”
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vgabndo
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Kit...U2U me, I have a set for sale that will fit your 20 HP.
Plastic "whale tail" type. Worked great on my 10 HP Honda, and a 25 Johnson.
Undoubtedly, there are people who cannot afford to give the anchor of sanity even the slightest tug. Sam Harris
"The situation is far too dire for pessimism."
Bill Kauth
Carl Sagan said, "We are a way for the cosmos to know itself."
PEACE, LOVE AND FISH TACOS
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BajaBruno
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KitJV,
I don't know how a 12' inflatable could handle the transom weight of a 20HP Honda. I tried it on mine and the transom nearly bent over. It worked
great with a 20HP 2-stroke, and a 10HP Honda, but the 20 HP 4-stroke was way too heavy
Also, I can't see why a 12' inflatable would need any help from a plate with 20HP behind it. That's just about max power for a 12' and it should
plane easily, even with several adults aboard. With a 10HP Honda, you might want some assist.
Christopher Bruno, Elk Grove, CA.
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kitjv
Junior Nomad
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BajaBruno,
Thanks for the info. The Honda 20HP 4-stroke weighs 105 lbs. The maximum rated HP for the boat is 30HP with a transom weight of about 175 lbs.
Admittedly, I haven't set off on my maiden voyage yet, but I am not anticipating any problems.
I will run the boat without the stabilizer plate first. Then, possibly, install the plate for comparison.
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Barry A.
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BajaBruno-----------my friend uses a very old Mercury 35 2-stroke on the back of his 12 foot Avon inflatable and it is a "rocket". He has no problems
with the weight. He does not use a anti-cavitation plate. He does carrfully moderate the throttle, tho. 
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