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Search took 0.00 seconds. Search: Posts Made By: StuM
Forum: Propellers & Drive Systems 21-08-2017, 15:52
Replies: 95
Views: 11,973
Posted By StuM
Re: Utilizing free wheeling prop spin

Sounds apocryphal to me.

What about these vehicles?
https://thinkprogress.org/prius-solar-roof-breakthrough-2b929f467061/
https://www.worldsolarchallenge.org/
Dutch startup puts first solar...
Forum: Propellers & Drive Systems 16-08-2017, 15:20
Replies: 95
Views: 11,973
Posted By StuM
Re: Utilizing free wheeling prop spin

Why? Because Hopcar asked:

"Mark, have you ever seen an explanation as to why a freewheeling boat prop generates less drag and a freewheeling airplane prop generates more drag?"

This is a ...
Forum: Propellers & Drive Systems 16-08-2017, 14:47
Replies: 95
Views: 11,973
Posted By StuM
Re: Utilizing free wheeling prop spin

And generally, aircraft props don't have a clutch - so when they spin, they are turning the engine.
Forum: Propellers & Drive Systems 15-08-2017, 20:49
Replies: 95
Views: 11,973
Posted By StuM
Re: Utilizing free wheeling prop spin

You mean like a Watt & Sea which is also your auxilliary propulsion?

Outboard propulsion has many problems on a sailing vessel which I won't bother to go into.
Forum: Propellers & Drive Systems 15-08-2017, 17:40
Replies: 95
Views: 11,973
Posted By StuM
Re: Utilizing free wheeling prop spin

I would bet the two different possible answers are available from two different manufacturers of engines and transmissions. :smile:

The appropriate mode depends on the specific combination of...
Forum: Propellers & Drive Systems 15-08-2017, 13:26
Replies: 95
Views: 11,973
Posted By StuM
Re: Utilizing free wheeling prop spin

How many of those cats have shaft drives that could use your system?

I'd guestimate that the majority of cats today have sail drives and more and more new monos have them as well.
Forum: Propellers & Drive Systems 14-08-2017, 15:08
Replies: 95
Views: 11,973
Posted By StuM
Re: Utilizing free wheeling prop spin

Lots of previous discussion here about hydro generation, including shaft driven, low speed alternators.

The most recent one about your idea that I can recall is here:...
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