Motion Comfort

[Mexdon]

Originally Posted by Bash

Yeah, it goes up with boat size.

So we needed Ted Brewer to tell us that larger boats tend to be more comfy than smaller boats?

He did say it was a Tongue in Cheek measurement. He knew it was cause consternation on forums like this.

[Cheechako]

Yeah... there's a 30 footer on the list with real high numbers.. wierd. The HC38 looks pretty high, but frankly I hated the motion of that boat in a stiff chop. Alot of the numbers are pretty close together. Not sure this is a a useful tool at all....

[boatman61]

Originally Posted by Bash

Yeah, it goes up with boat size.

So we needed Ted Brewer to tell us that larger boats tend to be more comfy than smaller boats?

Well.... always looks sexier with lotsa Math thrown in...

But for a LOA of 20.9 and W/L of 16.3 she's a lot more comfortable a ride than you'd think...
Have not lost the kettle yet...
I do also think keel/hull shape affects things a lot as well..

[Bash]

Originally Posted by Target9000

It goes up with boat size GENERALLY. But you can see in the list I posted, this doesn't always hold true.

Spencer 53, Motion Comfort=35.31
Spray 38 Centennial (Roberts), Motion Comfort=46.39

I'll take the Spencer any day, thank you very much.

[Target9000]

Originally Posted by Bash

I'll take the Spencer any day, thank you very much.

Duh! Who wouldn't? The one guy sitting in the back looking at CR as some sort of holy grail because a boat broker whispered it into his ear along with dropping Ted Brewer's name?

[tropicalescape]

Originally Posted by Cheechako

Has little to do with the full keel. More to do with the hull shape, amount of overhang and short waterline etc. Narrow boats, with very round bilges and long overhangs will roll and pitch in the right water. It's an interesting thing. When I lived aboard in Seattle, I used to watch boats at the dock during windy weather. There was one rather new design by a noted designer that always rolled a lot tied to the dock. It was supposedly an offshore fast design. It rolled so much that once it looked like it might actually have a mast clash with the boat next door.

was it a C&C 29?..I see one at a marina here that cant keep still, rolls from side to side at the slightest wake..looks like its going to hit the boats mast that are beside it...DVC

[Cheechako]

Saga....43?

[mrohr]

O.K. Its not the speed that makes one comfortable/uncomfortable its the accelerations.
Big difference; at 600mph I can enjoy my drink on a 747,but be miserable at 6 kts. When a boat is being jerked(slammed) about in any of the 6( or is it 7?) different motions a boat experiences in a seaway. Mass and hull form are the biggest factors;mass confers inertia so smaller accelerations.Hull form determines how the hull reacts to the forces (seastate) acting upon its various sections. Rock on the bottom=no accelerations. Ping pong ball=wild ride.

[MarkSF]

Mine rolls a bit under power, and also pitches back and forth a bit. But put up the sails, especially going upwind, she settles down nicely and really slices through a chop.

[Paul L]

Originally Posted by Cheechako

Saga....43?

It is listed in the Sail Calculator as 28.02

The original posters description seems a little off. Saying that there is a set of conditions offshore that are comfortable in a 42 ft boat doesn't say much about comfort. There is also a set of conditions that sux in almost any under 50 ft boat.
I just don't put any credence in the Motion Comfort ratio. I have a fair amount of experience offshore in two boats that are close to the same length and similar design weight. One has ratio of 36 and the other 21. I am far less likely to get seasick on the one with the 21 ratio. It is just a much more comfortable ride in medium or rough weather for me and my susceptibility to seasickness. Comfort is in the eye of the beholder.

[Cheechako]

Maybe that formula does work! Although this was rolling....

[Bluefuss]

Not to worry Boatman, as long as you can lay on the floor without holding on!

[capn_billl]

Where are Hunters and Macgregors on that list?

[boatman61]

Originally Posted by Bluefuss

Not to worry Boatman, as long as you can lay on the floor without holding on!

My Man....

[Randyonr3]

Because its a set formula set for a determined condition, if you change the condition, you also change the end result..
If the boat is rising and falling to be uncomfortable, you change directions to sail in the trough and the comfort changes..
It seems that the comfort motion of the boat has as much to do with the person opperating it as much as the type of boat it is..