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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > Can planing hulls exceed hull speed upwind?
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Thread: Can planing hulls exceed hull speed upwind? Reply to Thread
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Topic Review (Newest First)
08-26-2012 04:44 AM
SchockT
Re: Can planing hulls exceed hull speed upwind?

Quote:
Originally Posted by peterchech View Post
That ultimate 20 looks like a really fun boat! But what kind of speeds are we talking upwind? I mean a multi is doing 10 and up no sweat, what will that ultimate 20 do upwind?
With boats like the Ultimate 20 the real speed is off the wind. While they will certainly exceed their hull speed upwind, they will not get into the double digits. My Hotfoot 20 (the hull the U20 is based on) could hang with some larger displacement boats upwind but it wouldn't break onto a full on plane until it cracked off onto a reach. The main problem is that it is very difficult to keep the boat flat enough upwind for the flat hull form to get fully planing.
08-25-2012 02:16 PM
Flybyknight
Re: Can planing hulls exceed hull speed upwind?

Quote:
Originally Posted by Loki9 View Post
Yes, they can.
Big Time!
08-25-2012 10:47 AM
WDS123
Re: Can planing hulls exceed hull speed upwind?

The Ultimate 20 was originally comiisioned by a group of Santa Cruz Hobie Cat sailors who were aging out of their Hobies.

Jim Antrim designed the boat to be a monohull that reached multihull speeds.

U20 Class Association
08-25-2012 10:22 AM
peterchech
Re: Can planing hulls exceed hull speed upwind?

That ultimate 20 looks like a really fun boat! But what kind of speeds are we talking upwind? I mean a multi is doing 10 and up no sweat, what will that ultimate 20 do upwind?
08-25-2012 05:57 AM
WDS123
Re: Can planing hulls exceed hull speed upwind?

Yes,

Schock 40

Ultimate 20
08-25-2012 12:53 AM
rgscpat
Re: Can planing hulls exceed hull speed upwind?

Extreme example: foiling Moth (hydrofoil).
08-24-2012 12:32 PM
aa3jy
Re: Can planing hulls exceed hull speed upwind?

Yep..seen it done. When the Coast Guard tows in a strickened sailboat(displacement hull) under power of the CG cutter..just about destroys the boat at 20knts+..
08-24-2012 12:18 PM
Barquito
Re: Can planing hulls exceed hull speed upwind?

I would add to Loki9's response the following:
08-23-2012 05:27 PM
Loki9
Re: Can planing hulls exceed hull speed upwind?

Yes, they can.
08-23-2012 04:47 PM
Jeff_H
Re: Can planing hulls exceed hull speed upwind?

Both multihulls and and some sportboats are capable of acting as semi-displacement boats upwind. In other words, they are designed to miimize the size of their bow and quarter waves and so can achieve speeds which exceed their theoretical hull speed. But besides hull speed is not an absolute brick wall, it is only a point where dynamic drag rises very steeply.

Jeff
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