Dolfin planing plates for small outboard - SailNet Community
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post #1 of 15 Old 03-22-2014 Thread Starter
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Dolfin planing plates for small outboard

Is there any advantage to adding Dolfin plates to my Tohatsu 3.5 on my 8.6 air floor dinghy? Will they fit on the small cavitation plates?

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post #2 of 15 Old 03-22-2014
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Re: Dolfin planing plates for small outboard

even on bigger engines, I think all those did was plane money out of your wallet

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post #3 of 15 Old 03-22-2014
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Re: Dolfin planing plates for small outboard

There is more than one size (and manufacturer) available. You should be able to find one for most small outboards. I have found them to make a sizable difference in the ability to plane, especially when the dink is heavily loaded.
Of course, if you have a 15' dinghy and a 2hp engine ain't nothin' gonna help.

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post #4 of 15 Old 03-22-2014
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Re: Dolfin planing plates for small outboard

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Originally Posted by Tayana42 View Post
Is there any advantage to adding Dolfin plates to my Tohatsu 3.5 on my 8.6 air floor dinghy? Will they fit on the small cavitation plates?

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Do Dolphin fins help to get a dink onto the plane YES>

But expecting to get on the plane with a 3.5hp OB is optimistic. It might just if you weigh 90lbs and have a really clean bottom.
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post #5 of 15 Old 03-22-2014
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Re: Dolfin planing plates for small outboard

TQA, why does it matter how well I clean MY bottom? My inflatable has a clean bottom; isn't that enough?

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post #6 of 15 Old 03-23-2014
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Re: Dolfin planing plates for small outboard

They wont work for your dinghy as I doubt you can plane with a 3.5.

The dolphin fins do slow you down a bit. So they are only effective making a boat and ob that planes do so faster and with more stability when on the plane.

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post #7 of 15 Old 03-23-2014
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Re: Dolfin planing plates for small outboard

I put one on my 16 foot fishing boat with a 35 HP outboard. In rough ocean waters it helped keep the bow down at slow to medium speeds, about all that we could run without beating the boat to death. Not sure if I lost any top speed, but I don’t think so. Also had an 8 foot inflatable raft with a 2HP Honda on it. I doubt putting a plate on your motor would help in any way.

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post #8 of 15 Old 03-26-2014
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Re: Dolfin planing plates for small outboard

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Originally Posted by mad_machine View Post
even on bigger engines, I think all those did was plane money out of your wallet
I disagree, I've had 3 outboards onto which I mounted the Dolphin or similar plates and it has made a world of a difference each time. No cavitation anymore and the dinghies really do go on a plane much faster. I had 9.8HP Tohatsu engines but I think that smaller engines will profit and gain performance as well.


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post #9 of 15 Old 03-26-2014
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Re: Dolfin planing plates for small outboard

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Originally Posted by dabnis View Post
I put one on my 16 foot fishing boat with a 35 HP outboard. In rough ocean waters it helped keep the bow down at slow to medium speeds, about all that we could run without beating the boat to death. Not sure if I lost any top speed, but I don’t think so. Also had an 8 foot inflatable raft with a 2HP Honda on it. I doubt putting a plate on your motor would help in any way.

Paul T
One way to find out, try one. All it costs is a little bit of money & a few holes in your cavitation plate.

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post #10 of 15 Old 03-26-2014
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Re: Dolfin planing plates for small outboard

In order for a dinghy to plane is must have a planing hull form. A flat bottom inflatable will not plane no matter how much power or what you do to it.

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