V bottom degree.

[Captain Phoenix]

Is there anyone who has an idea about the perfect V bottom degree for a sailboat in a choppy sea with less slamming ? The new Mac26M is 15 degree.

What about others sailboat?

[Terry]

My M does not slam unless I am using the engine and going too fast. The perfect hull for choppy seas is not necessarily the best saiboat hull. All sailboat hulls are a compromise of some sort depending on the designed use. I find keeping the mainsail up with the engine going helps keep the boat plowing instead of pounding, kind of helps keep it steady. Keep in mind the Mac26M is a hybrid and has some powerboat hull characteristics for improved powerboating. Perhaps some reading on hull designs may shed some light on your question.

[Richard O'Brien]

This is an interesting question Terry

I've noticed the current trend in racing hulls seems to be rounder even up near the bow, with a wide stern, plumb bow, and a sharp V in the plan i.e. overhead view.
I wish that I knew whether this compromises comfort for speed? Nearly everyone seems to favor bulb keels over fin , or cutaway keels. They aren't as pretty as the old full keel classics, but computer, and tank testing has come a long way I suspect?

Richard

[DaveB]

The most used Dead rise is the 23 degree originally put out by Bertrum.
The more you increase the V..the more power you need to push the boat.
The added V in a M has demanded more power to do the speeds of a X but will handle a softer ride beating.(powering)
Depends on the wave conditions and current you sail in.
These boats are Power Sailers and require sound judgement when to unload ballest to aquire hull speed.
That means...weight aboard and positions of passengers.
Wind conditions and the relitive direction to your course.
Waves that prevent your Plane. ( wind against current ).
There are many options, but Sail and Power safe.
Dave

[Night Sailor]

I suggest that the designers of the Around the World Alone race boats and Maxi's of various lengths have just about the optimum monohull forms for sailing at 25 knots or better in the Southern Ocean where slamming is a every second possibility. I also think that any boat that sails or powers off the top of a wave is going to slam coming down the other side. As posted earlier, part of knowing your boat and good seamanship is just sailing within your boats best performance parameters, not trying to keep up with anyone else's boat unless it is an exact copy in every respect.

[Captain Phoenix]

What is the ideal V degree of the hull botton shape if we have a sea like San Francisco bay. Very choppy and sharp and fast waves ??

Is 15 degree of the 26M enough for that sea?

[Highlander]

The & have what you would call a semi V-hull 26M is 15deg the 19m is 17deg & will give you a softer entry into rough sea's & less of a hard thud & pounding than a flat bottom boat like the 26X , the deep V-hull's will let you run harder & faster in rough sea's with less pounding & tend to run down the big swells with more control than a flat bottom boat , but they take more HP & gas to run at a plane & the deep v-hull's tend to sit a lot deeper in the water when running less than planing speed

J