[HN Gopher] DDWFTTW Vehicle Analysis (2013)
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DDWFTTW Vehicle Analysis (2013)
Author : Tomte
Score : 17 points
Date : 2022-07-09 12:04 UTC (1 days ago)
(HTM) web link (web.archive.org)
(TXT) w3m dump (web.archive.org)
| TimSchumann wrote:
| Derek from the YouTube channel Veritasium made two interesting
| videos about this vehicle.
|
| https://www.youtube.com/watch?v=jyQwgBAaBag
|
| https://www.youtube.com/watch?v=yCsgoLc_fzI
|
| They go into some nice detail about why the physics works out the
| way it does.
| tzs wrote:
| There is still some disagreement though. Here's a more recent
| video by someone saying that those didn't get it right [1].
|
| I have no idea what his qualifications are, though, as that is
| his first video in English, and most of his other videos don't
| seem to be about physics. But at least on first watch his
| physics sounds sound.
|
| [1] https://www.youtube.com/watch?v=qw1Bk4g50YM
| littlestymaar wrote:
| Wind-powered vessels are very counter-intuitive: not only you can
| get faster than the wind by going downwind (with such a device)
| but you can also get faster than wind while going almost upwind
| (it works better when landsailing).
|
| It's counter-intuitive because people often imagine the wind
| "pushing" the sail, while the force that actually happens is
| lift, which works with _apparent wind_ instead of true wind.
| smitty1e wrote:
| Aircraft wings are maybe easier, and thinking of a sail as a
| vertical wing may help.
| ReactiveJelly wrote:
| "Dead Downwind Faster Than the Wind"
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(page generated 2022-07-10 23:01 UTC)