Oops, did I forget to define my terms? Per Marchaj and others, gamma is the course angle off of upwind, so Marchaj's formula is equivalent to...
These videos are fantastic. I have one more suggestion to eliminate the jumps at transitions between each reference frame segment and instead...
Doh! Hoisted by my own petard. Again. But when I see you guys are smarter than everyone else, what else should I suspect you were doing in...
I thought the Christian Church was the only organization that shoots its wounded. It was instructive badgering back and forth with Rick about...
No, not exactly new; he started the thread. I think Rick's missives are directed at me and you wandered into the middle of a pointless p*ssing...
Yes and no. There is a formula for a theoretical max velocity for a foil with no other losses: Vs/Vt = sin(gamma) * (L/D) - cos(gamma) for...
[IMG] Until you run out of string. See also: http://www.youtube.com/watch?v=CWmeTWPN5o4
You guys are on XKCD too? When do you have time to build this thing? When do you have time for a job?
Actually I would explain them all exactly the same way: F = d(mv)/dt. The rest (twist, F = INTEGRAL_r( d(m(r)v(r)/(dt.dr) dr ), etc) is an...
The wheels' ground-relative Velocity is high (by comparison to the prop). The prop's air-relative Velocity is low (by comparison to the...
Sadly, yes. I should have said "So if someone competent knows DUWFTTW is possible, they can't logically deny DUGFTTG ..."
Something just struck me Maybe somebody already pointed this out, but ... I think there are some who believe a cart that could go DUWFTTW (per...
Thanks for providing those numbers. Did the ThinAirDesigns team use JavaProp? Are your numbers based on their design parameters or do you...
Ooh! Ooh! Let me! Let me do this one! You can go back through this thread, this has been covered at length. I'll try to summarize. The...
... at that terminal speed. I assume you mean from at the beginning i.e. startup when the prop foils are stalled. As you approach terminal...
Hi Rick, I apologize for the confusion I caused by not being clear, but I'm not a neophyte here. I've washed down the crow with the kool-aid and...
Query 2) turbine buckets 2) What is the design speed of the true wind after it encounters (passes from windward to leeward of) the propeller?...
System and prop L/Ds? three quick queries: 1) Marchaj (Aero-hydrodynamics ...) has a formula for Vs/Vt max (Vs = boatspeed, Vt = true windspeed)...
http://en.wikipedia.org/wiki/Talk:Sailing_faster_than_the_wind#Criticism_zero The point of the diagram was to demonstrate how a fixed sail, on...
Someone's humorous link to the wiki talk:sailingfasterthan... page got me sucked in and I was up all last night. Apparently you guys are...
