the New Design Book
I put so much time into this new new book. So many upgrades and additions. It will be wild. The new cover.
Archive for the ‘ Design Questions ’ Category
The New Design Book is Done
Finally. The major upgrade to the Design Book, 2012 is done. It has been a big deal. It will go to the printers on May 11 or soonest work day after the 10th. I appreciate everybody’s patience.
My goal also is to have a CD version with the print design book. It will be in color and have the hot hyperlinks. I am using Pagemaker as I just didn’t have the 2 hours it usually takes to get my Indesign permissions taken care of on the new laptop hard drive. So I will have to run all the Pagemaker files through Indesign when I get back to hot up the hyperlinks.
Thanks again.
New Rowing Trimaran
You might recall that my Formula 40 catamaran hull lines held the world record for fastest rowing across the Atlantic last year. For a day. I did not know about the rest of the design, and a lot was wrong. I insisted on being fully involved with the next boat. Crew of 9. Here it is.
Rower 60 Trimaran
Features:
Main hull has L/B of 21:1. Displacement of 4848 lbs. Hull speed is 11 knots. At hull speed it takes under 6 hp to move at that speed. At that speed there is 265 lbs of form drag and 125 lbs of friction drag. Draft is only 12” so change in depth over the trip should not change much, keeping waterline long.
X bow allows less hull area, reduced windage and significantly less wave pitching. See video at http://www.militaryphotos.net/forums/showthread.php?152989-Xbow-Sea-Axe-A-future-in-the-Military-Design.
Next year everybody will have these bows. Flare is high enough above waterline that it should not increase pitching.
Total main hull max height is 6.5’. I say that the governing load will be a wave on each end and the middle in the air. The flare also helps restrain buckling.
Curved openings are much stronger. Upwind I would cover openings with Eisenglass or thin acrylic like man-powered craft record holders do.
Top will have solar panels and flush hatches as needed.
Amas are just under 17’ long and 1000 lbs displacement reserve. I see greatest load being pushed sideways 20’ by a wave. Location aft helps minimize pitching again as it spreads out the centers of buoyancy.
I assume beam should be completely rigid, like in bicycle racing where flexing frame is seen to absorb power.
I see this as having every possible thing done right. I don’t know if 5’ tall above waterline is too much. It does give more beam depth.
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Back and gone again
I’m back. I’m gone again tomorrow. I thought I could get out of it, but no. Back on the 10th. I might have email. Any shopping cart orders cannot be filled until I return.
Lightning and Sailboats
This very interesting article on lightning was noted on the multihull forum. See http://edis.ifas.ufl.edu/sg071
I’m Out of Town for 10 Days.
Starting tomorrow afternoon I’m out of town until the 19th. That will give me some time to do creative work and not just emails. Being a design office and not Amazon, shopping cart orders will not be filled when I am gone..
AmCom Tomorrow
The AmCom Design and Manufacturing Show is going on tomorrow in Bellevue, WA. See http://www.amconshows.com/ShowInformation/SeattleWA/tabid/1011/Default.aspx
Visit with local manufacturers of many items useful to building boats. Including composite bearings. Free parking from the website or I stuck the car at Bellevue Square. Sorry Kemper.
Internet Down Today
It seems that the website and all email are down today. I will try to contact server and find out why. They say hardware issues. Its like a 5th world country here in Seattle sometimes with access.
Archive Pictures
I I had to dive into deep offsite archives looking for the Kobayashi 53 catamaran design files. I also found a wealth of old photos. Here with ocean sailor Konrad Kalpen on my tri. 1994 maybe.
Laminate Weights
I forget where this came from. Enjoy.The more enlightened builders can use metricalc to convert. Someday this will be a spreadsheet.