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Search took 0.00 seconds. Search: Posts Made By: dustman
Forum: Multihull Sailboats 15-06-2019, 13:49
Replies: 32
Views: 10,182
Posted By dustman
Re: Calculating power requirements for catamaran.

I own The Nature of Boats, The Symmetry of sailing, and The Sailors Bible. The nature of boats I have read through, still working on the other 2. Any other good books to recommend?
Forum: Multihull Sailboats 14-06-2019, 17:10
Replies: 32
Views: 10,182
Posted By dustman
Re: Calculating power requirements for catamaran.

I guess a question I should be asking is how much less efficient are sails when heading downwind acting as a drag device than when acting as a wing on a reach?
Forum: Multihull Sailboats 14-06-2019, 17:06
Replies: 32
Views: 10,182
Posted By dustman
Re: Calculating power requirements for catamaran.

I'm thinking full battens, with the first reef attached to the lowest batten. According to some Wharram people the sails are flat cut for some reason. I think I would add a boom along with the...
Forum: Multihull Sailboats 14-06-2019, 16:59
Replies: 32
Views: 10,182
Posted By dustman
Re: Calculating power requirements for catamaran.

The beam would be 20', and the schooner rig would have a low CE.


The Wharram wingsail is not a true rigid wing sail and is reefable, supposedly fairly easily.



I'm also trying keep the...
Forum: Multihull Sailboats 14-06-2019, 16:45
Replies: 32
Views: 10,182
Posted By dustman
Re: Calculating power requirements for catamaran.

Thanks for the reply.


So I ran the calculations on Gerr's formula, at 1500lb, 40' LWL, and 7.5 kts(approx. 200 miles a day if average speed) it comes out to 1520 watts. Also according to Gerr,...
Forum: Multihull Sailboats 13-06-2019, 18:03
Replies: 32
Views: 10,182
Posted By dustman
Re: Calculating power requirements for catamaran.

It would have wharram wingsail schooner rig. At the moment my research leads me to believe around 100ft2 would be about right for good all around performance. I would love to have a better formula...
Forum: Multihull Sailboats 13-06-2019, 16:39
Replies: 32
Views: 10,182
Posted By dustman
Re: Calculating power requirements for catamaran.

Thanks for your replies, but am looking for actual data or a formula to use. In the not too distant future I am going to build a very slim-hulled cat and want to properly size both sails and motor....
Forum: Multihull Sailboats 10-06-2019, 13:30
Replies: 32
Views: 10,182
Posted By dustman
Calculating power requirements for catamaran.

The more I look into power requirements for my design the more unsure I become.


I have been relying on Gerr's formula(via Psycho Snail website calculator) for displacement craft, but realized...
Showing results 1 to 8 of 8

 
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