Light air performance of different multihulls?

[Training Wheels]

Originally Posted by Factor

See here for a cruising couple in their late fifties on a proper sailing cat
6 knots true, 10 knots boat speed, lets see your Sabre rattler do that!

Having a hard time believing this one. Please, what kind of cat, a Gunboat?

[Tupaia]

Originally Posted by Training Wheels

Having a hard time believing this one. Please, what kind of cat, a Gunboat?

This is the light wind polar for my cat. These are actual values recorded at sea on passage, loaded, with old sails and old persons on board.

[Training Wheels]

Impressive, but still not 10 knots in 6 knots of wind.

[Tupaia]

Originally Posted by Training Wheels

Impressive, but still not 10 knots in 6 knots of wind.

Easily achievable if not loaded up for an ocean passage. It is all down to weight.

[mglonnro]

Originally Posted by Tupaia

Easily achievable if not loaded up for an ocean passage. It is all down to weight.

Sorry if this has been asked a hundred times, but what boat are you sailing?

[barnakiel]

Originally Posted by Training Wheels

Impressive, but still not 10 knots in 6 knots of wind.

This would be a foiler. And a racing, not cruising crew.


b.

[Tupaia]

Originally Posted by mglonnro

Sorry if this has been asked a hundred times, but what boat are you sailing?

Shuttleworth Advantage.

[Factor]

Originally Posted by Training Wheels

Having a hard time believing this one. Please, what kind of cat, a Gunboat?

Schionning Waterline. Built by the owner.

[Factor]

Originally Posted by barnakiel

This would be a foiler. And a racing, not cruising crew.b.

Nope - proper cruising boat Husband and wife crew

[mglonnro]

Originally Posted by Factor

Schionning Waterline. Built by the owner.

I googled some of those. How beautiful boats!

https://www.youtube.com/watch?v=6htOymDro2M

[mglonnro]

I scraped together ROUGH numbers from the posts in this thread. I'm sure I misinterpreted something, but it's easy to fix.

"How much wind is needed to get about 4-5 knots of boatspeed?"

Upwind

Balance 526 4-5 knots
Outremer 5X 5-6 knots
Shuttleworth Advantage 6 knots
Gemini 105MC 34 foot 6-8 knots (?)
Serendipity 43 7-8 knots
Seawind 1160 Lite 8 knots
Hanse 388 8-10 knots
MainCat 41 9-10 knots
Lagoon 400 9-10 knots
Lagoon 42 9-10 knots
Lagoon 42 TPI -93 10 knots


Reaching

Shuttleworth Advantage 4 knots
Schionning Spirited 480 4-5 knots
Balance 526 4-5 knots
Outremer 5X 4-5 knots
MainCat 41 4-5 knots
46’ Custom Cat 4-5 knots
Searunner 38 5-6 knots
Lagoon 42 TPI-93 5-6 knots
Lagoon 400 5-7 knots
Hanse 388 6-7 knots
Gemini 105MC 34 foot 6-8 knots
Lagoon 42 8-9 knots

[arsenelupiga]

Originally Posted by mglonnro

I scraped together ROUGH numbers from the posts in this thread. I'm sure I misinterpreted something, but it's easy to fix.

"How much wind is needed to get about 4-5 knots of boatspeed?"

Upwind

Balance 526 4-5 knots
Outremer 5X 5-6 knots
Shuttleworth Advantage 6 knots
Gemini 105MC 34 foot 6-8 knots (?)
Serendipity 43 7-8 knots
Seawind 1160 Lite 8 knots
Hanse 388 8-10 knots
MainCat 41 9-10 knots
Lagoon 400 9-10 knots
Lagoon 42 9-10 knots
Lagoon 42 TPI -93 10 knots


Reaching

Shuttleworth Advantage 4 knots
Schionning Spirited 480 4-5 knots
Balance 526 4-5 knots
Outremer 5X 4-5 knots
MainCat 41 4-5 knots
46’ Custom Cat 4-5 knots
Searunner 38 5-6 knots
Lagoon 42 TPI-93 5-6 knots
Lagoon 400 5-7 knots
Hanse 388 6-7 knots
Gemini 105MC 34 foot 6-8 knots
Lagoon 42 8-9 knots

very scientific. to complete picture you need to know load of boat at the time of result. Ours is loaded 3T from empty.

[NaClyDog]

Originally Posted by arsenelupiga

very scientific. to complete picture you need to know load of boat at the time of result. Ours is loaded 3T from empty.

Wouldn't the sails (and types) contribute greatly to this as well?

[Chotu]

Originally Posted by NaClyDog

Wouldn't the sails (and types) contribute greatly to this as well?

That’s what I was thinking.

Almost has more to do with the rig than anything else.

Data needs to be normalized by the square meter or square foot of sail area presented.

[smj]

Originally Posted by mglonnro

I scraped together ROUGH numbers from the posts in this thread. I'm sure I misinterpreted something, but it's easy to fix.



"How much wind is needed to get about 4-5 knots of boatspeed?"



Upwind



Balance 526 4-5 knots

Outremer 5X 5-6 knots

Shuttleworth Advantage 6 knots

Gemini 105MC 34 foot 6-8 knots (?)

Serendipity 43 7-8 knots

Seawind 1160 Lite 8 knots

Hanse 388 8-10 knots

MainCat 41 9-10 knots

Lagoon 400 9-10 knots

Lagoon 42 9-10 knots

Lagoon 42 TPI -93 10 knots




Reaching



Shuttleworth Advantage 4 knots

Schionning Spirited 480 4-5 knots

Balance 526 4-5 knots

Outremer 5X 4-5 knots

MainCat 41 4-5 knots

46’ Custom Cat 4-5 knots

Searunner 38 5-6 knots

Lagoon 42 TPI-93 5-6 knots

Lagoon 400 5-7 knots

Hanse 388 6-7 knots

Gemini 105MC 34 foot 6-8 knots

Lagoon 42 8-9 knots

More accurate data can be found at
multihulldynamics.com
It’s not perfect but should give a good idea on a boats performance especially when compared to others