Daggerboard Update

baldbaby2000 · Post by **baldbaby2000** » Thu Apr 06, 2006 6:25 pm

I like the hose idea. I put some closed cell foam under it for tomorrow. Maybe I'll combine the 2. I'm not really too worried about the board. The bottom is about 2" thick fiberglass; above that is solid lead. After lowering it on the bar I checked for side-to-side movement and it seems negligible so I don't think I'll do anything special. If the boat and trailer move independently, I think the board will slide on the crossmember without causing too much stress on the trunk. My biggest concern would be a failure of the bar on the trailer so I'll keep the keel line slightly taut.

After owning 2 Mac 25's which have 650 lb keels that rest on the trailer, my 26M's 90 lbs seems rather tame. The Mac 25 keel was pretty sloppy in the trunk and I'm sure it bounced around much more than my 26M daggerboard will. The current owner of the Mac 25 is a very good friend of mine and after 20 years there is no noticable trunk wear.

delevi · Post by **delevi** » Tue Apr 11, 2006 12:31 pm

OK. The keel is finished and shipping today.

Here are some pics. The plastic edges at the top are the UHMW (very strong plastic) strips to avoid chips in the portion which is supported in the trunk. The total weight is 169 lbs with 147 lbs of lead in the bottom 14 inches. Can't Wait!

Leon

Newell · Post by **Newell** » Thu Apr 13, 2006 6:20 am

delevi,

Looks like Ida Sailor has done a good job. Board appears great and looks deceptively lightweight. I quess it will be shipped freight.

I'm convinced the X needs more surface area exposed to the water, when I see how much larger the M board is in comparison.

Newell
Currently on Ocracoke Island NC

Newell · Post by **Newell** » Thu Apr 13, 2006 6:22 am

delevi,

Looks like Ida Sailor has done a good job. Board appears great and looks deceptively lightweight. I quess it will be shipped freight.

I'm convinced the X needs more surface area exposed to the water, when I see how much larger the M board is in comparison.

Newell
Currently on Ocracoke Island NC

Divecoz · Post by **Divecoz** » Thu Apr 13, 2006 7:20 am

Newell wrote:delevi,

Looks like Ida Sailor has done a good job. Board appears great and looks deceptively lightweight. I quess it will be shipped freight.

I'm convinced the X needs more surface area exposed to the water, when I see how much larger the M board is in comparison.

Newell
Currently on Ocracoke Island NC

I find the above very interesting as I . . .don't recall that coming up on this board before.
So I ask just how much smaller is the swing keel on the X than the board on the M ?

Catigale · Post by **Catigale** » Thu Apr 13, 2006 10:53 am

Just as an add-on, I measured the M daggerboard area as about 4 sq. ft and the X as 2.5 sq ft.
There goes the blue hull advantage.

I measured this by porting Rogers CAD output on his website into an integration program I wrote in COBOL with nested assembly, and checked it by measuring on my screen with a ruler, and got the same result.

Your area may vary.

DLT · Post by **DLT** » Thu Apr 13, 2006 11:10 am

Boy, I sure hope it gets warm enough for Stephen to go sailing soon...

Richard O'Brien · Post by **Richard O'Brien** » Thu Apr 13, 2006 12:16 pm

I suppose this belongs in a new thread?

I met a sailor last night who has a San Juan 21. He said that they came with vinyl tabs that cover the slot when centerboard is lowered, and that they have lasted for over 20 years. I wonder if something like that might help the X lower it's resistance? If I get to see his boat (he's in the same dry storage lot) I'll check it out?

NautiMoments · Post by **NautiMoments** » Thu Apr 13, 2006 12:25 pm

Did you measure how many square feet are really in the water. I believe 12-16" stay in the trunk. May make those blue hulled

s faster. Those Xs have a built in water brake (drag) system called the swing keel trunk.

At least the

ers have a good knowledge at what the

stern looks like when they are racing.

Scott · Post by **Scott** » Thu Apr 13, 2006 12:35 pm

Cat said:

I measured this by porting Rogers CAD output on his website into an integration program I wrote in COBOL with nested assembly, and checked it by measuring on my screen with a ruler, and got the same result.

Yeah , ok whatever. How much stays in the boat on an M??

Engineers..............................Oh yeah, Lazer beam ray gun scientists too........

Richard O'Brien · Post by **Richard O'Brien** » Thu Apr 13, 2006 12:51 pm

DLT wrote:Boy, I sure hope it gets warm enough for Stephen to go sailing soon...

Chip Hindes · Post by **Chip Hindes** » Thu Apr 13, 2006 1:50 pm

At least the Xers have a good knowledge at what the M stern looks like when they are racing.

Actually, never seen one. Is it similar to that of the X?

I know the only M I've ever been out with has a pretty good idea what mine looks like. BTW, it looks the same when when the Tohatsu's cookin' (except smaller; perspective, you know) as it does when it's sailing.

Probably why the Ms need the extra windows in front, so they can better see who they're chasin'

DLT · Post by **DLT** » Thu Apr 13, 2006 2:00 pm

Chip Hindes wrote:Probably why the Ms need the extra windows in front, so they can better see who they're chasin'

Nice dig... And we certainly had that coming given the earlier inference...

But, the M doesn't have extra windows in the front, only on the side... I guess that's so we can get a better look at you while we're passing you, it all happens soo quick you see....

Chip Hindes · Post by **Chip Hindes** » Thu Apr 13, 2006 2:02 pm

You mean those double stacked windows in the front are fake?

DLT · Post by **DLT** » Thu Apr 13, 2006 2:05 pm

Yeah, there are only two front facing windows...

MacGregorSailors.com

MacGregorSailors.com

Daggerboard Update

180 lb db

180 lb db

Re: 180 lb db

X centerboard improvements?