bertram31.com

On another web site there is a question of deadrise for a 25 bertram--I believe it the same as a 31--23 or 24 degrees.

Can't find a reliable source for this.

At what point on the hull would you like it measured. I have a 25' Bertram and an electronic angle finder and I'm not afraid to use it!

Rocket wrote:At what point on the hull would you like it measured.

Rocket

The deadrise angle is taken at the transom. I don't think it changes very much for the first 8 or 10 feet from the transom forward.....may be even further than that.

My transducer has a built in 20 degree angle and I am mounting it midship....we will see how that works.

hb

I measured. At the transom is 24 degrees. 8' forward of the transom is 28degrees, the deadrise is variable throughout the length of the boat. The lifting strakes are zero degrees.

Harry Babb wrote:

Harry

If you are referring to the Airmar fluch mount, I put one in mine. It is amidship right between the engines, slightly to the starboard side. Works just fine. You just need to swallow hard before you drill that 4 inch hole.

Tony wrote:You just need to swallow hard before you drill that 4 inch hole.

It's already done......I actually just enlarged an older hole from a previous transducer......its about a foot inside the cabin just forward of the Port Engine.

Some how making a 4" hole did not bother me much.....but 2, 6" holes for the exhaust made me take a step back.....but its also done.

hb

The "magic" of a Ray Hunt hull was supposedly constant deadrise.

The deadrise of a Bertram 25 is 24 degrees.

But there is more art to it than that. Frankly the deadrise is far from constant. But it doesn't vary as much as in other hull forms.

the round bottom is also important. it doesn't go to a hard line at the keel.