Originally Posted by decktapper
Races, Math, and papers will be slow to convince people, but a fleet of charter
boats, that could change minds quickly.
Good luck, it looks very promissing.
from Lanikaisailor.................. @ Sailing Anarchy talking about wings, I thought you all should read
I am a newbie and don’t usually post but thought that someone that has sailed on Harborwing’s “HWT-X1” could add something to the mix. I have been able to help Mark and his team as a safety
consultant on many of their tests over the last two years. I am not a rocket scientist but have got to drink cocktails with the two doctors of Aerospace engineering that have worked on the boat. From what I gathered, the wing on HWT-X1 has less drag than a round object or mast
1/10th the size. http://www.soe.ucsc.edu/~elkaim/Documents/...kaim_config.pdf
The boat has sat out at the dock
in many local storms here in Hawaii
and done fine. This is dirty gust over 45knots.
Let me first start out by explaining that HWT-X1 is a proof of concept
prototype and not meant to show everything that can be done with the technologie. She is a Stiletto 27 extended to 30’ with the stock 14’ beam. She has a 36’ wing that is way too powerful for her needs (David Hubbard is a racer) if you watch closely in the video on Harbor Wing Technologies - Autonomous Unmanned Surface Vessel - AUSV
you will see that the top four panels
don’t even have film on them. She is full of batteries, motors and computers
and weighs over 4000lbs (she is a crude prototype, sorry Mark). The boat can still fly a hull. She can sail comfortably up wind
at 25degrees of true, feathers at 20 and stalls at above 19.
This boat can sail by itself! It is totally autonomous and shows that the technology is viable. Is it the correct platform for offshore
cruising? No, but she has sailed in over 6’-8’ seas with winds up to 42knots apparent and lived to tell about it. I was there watching, and yelling at the engineers to shut if off before it could flip (this was before the computers
knew to turn down the thrust in certain conditions and before the load cells where installed.)
On another test, this boats computer system compensated in a strong gusts and adjusted trim so as not to flip a half of a second before the observing sailor on board hit the chicken switch.
Has there ever been another time that a computer has saved a multihull
For that matter is there another boat that can tack, jibe, sail backwards, reef, while holding a perfect course without any people involved?
This is a real program with real sailors behind it. Stan Honey still has the speed record
with the boat of 13.4knts close reaching.
Everyone asks about hurricanes, and there is some mention of taking one of these into the southern ocean. My opinion is that you could design a G class multi with wings that could handle the task, but most sailors don’t try to go there. Would you take a Moorings 42 down there? Could a wing boat with these technologies survive a hurricane
, I think maybe. Not all boats out there now do.
Bottom line is that the wing is easy to use and self trims so that you can concentrate on driving the direction that you want to and not have to worry about the sail trim. This has been hard for sailors to grasp; the direction of travel doesn’t change trim. The wing is always maximized for the angle of attack or thrust desired. It is the fastest way to reef that there is. The wind speed comes up the angle of attack is trimmed down.