MacGregorSailors.com

As you know from another thread, I am thinking about engine options and extreme mods. Is it possible to change the hull on a Mac 25 to get it to plane?

I don't think the hull has the flat part of the so called power sailors so the short answer is

A. Major fiberglass job

B.reakout the sawmill

C.130

Two other ways to cure the need for speed on lake sailing

A little runabout withna 50 HP will run you about 1500-2000 USD in good condition here in NY...can't be any more in the Heartland

If the sailing bug bites you with your 25, for 2-3k you can get a nice fast Harpoon and join me and Kevin in that club...I got my 4.6 up on plane for the first time this month and it was a riot

I think just one of those two Rolls Royces Cat was sitting between over Buffalo would do the trick

Rick

A Donzi 22 Classic gets on plane real fast... wouldn't take much to fit it with a mast!

in the keys a few years back I saw a venture 22 with a 40hp, no mast.

assume it was used for fishing... but never saw it run.

you would be better off selling and buying the X or M. or just get a fast dingy for speed.

a 10' dink with a 15hp will run.. fast!

You can technically get a log to plane with 150hp motor on the back--for a few seconds, before it catches a wave wrong and flips, or you try to turn and it rolls over on you. People plane on the bottoms of their feet. All it takes is power.

"Safely planing" however requires a relatively flat stern that will slip over the top of the surface sideways. Without the ability to side-slip on a plane, the drag on the hull will cause it to roll over in the direction opposite the interior curve of the turn. That's not a "might happen", it's a "certain to happen, the first time you turn under significant power".

Don't do it.

Matt

If my M wont plane, then you've got no chance of making a displacement hull plane

This should get the job done!
Hull shape won't matter when your airborne

First of all the 25 is a displacement hull by design.

Secondly it has its ballast in the form of a 635 lb cast iron keel.

In order to release some displacement, you would have to release the keel to the ocean/lake bottom. And then trim (tabs perhaps) the the hull under the thunder of 50/60 hp of stern propulsion to raise the bow above its own wake, which is probably still unlikely.

A sailboat as such will not raise above its own bow wake simply because of its inverted wing design relative to shared mass ratio above/below water surfaces. This gives a sailboat the feeling of presence in the water and thus stability becomes noticable as it relaxes from bobbing and slapping through choppy waters while powerboats pound and slap their way through such conditions.

Tom

Barn doors for trim tabs and 200 hp will do it!!

Carioca wrote:Barn doors for trim tabs and 200 hp will do it!!

It would be more nautical if those table legs were Queen Anne....

Catigale wrote:It would be more nautical if those table legs were Queen Anne....

OMG

Whadda dumarse remark that was ... but it was brilliant

My wife thought we need a defribulator in the house. And she is right as long as Mr Catigale is on the loose. You sir are brilliant and tho I do not know what line of work you are in you are in the wrong line of work. I laughed for 20 minutes on this one! I am sure glad my heart handled this

Goes to showya I am in good health!

Tom