Chronology Current Month Current Thread Current Date
[Year List] [Month List (current year)] [Date Index] [Thread Index] [Thread Prev] [Thread Next] [Date Prev] [Date Next]

Re: [Phys-L] Impossible vehicles.

(In the one-dimensional case) the sailboat’s speed is said to max out at wind speed, but actually it must be less than wind speed, due to the water drag on the boat.

Bill Norwood
U of MD at College Park

Sent from my iPhone

On Jun 2, 2021, at 2:31 PM, Brian Whatcott <> wrote:

Here's the directly upwind version of a similar vehicle

On Wednesday, June 2, 2021, 01:09:42 PM CDT, Brian Whatcott <> wrote:

I know of two vehicles that give rise to invective from physics professors: The sand-yacht that rolls directly down wind at twice the speed of the wind

Couldn't find a video of a toy boat with a big air propeller driving a small water prop directly upwind.But they exist!
Forum for Physics Educators

Forum for Physics Educators