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Showing results 1 to 14 of 14
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Search: Posts Made By: RGClark
Forum: General Discussion (sailing related) 07-25-2006
Replies: 181
Views: 16,968
Posted By RGClark
I'll make this promise: No more posts on the...

I'll make this promise:
No more posts on the subject until after I perform my bathtub experiments.


- Bob
Forum: General Discussion (sailing related) 07-25-2006
Replies: 181
Views: 16,968
Posted By RGClark
Hmm. I said that the lift force only produces a...

Hmm. I said that the lift force only produces a "rearward" and sideways force component. That's certainly the way it looks in the images on the web page I cited "The physics of sailing." But in that...
Forum: General Discussion (sailing related) 07-24-2006
Replies: 181
Views: 16,968
Posted By RGClark
Any explanation that does not include the force...

Any explanation that does not include the force of the water on the keel is incomplete for explaining tacking into the wind.

This page provides a good explanation of it:

The physics of...
Forum: General Discussion (sailing related) 07-24-2006
Replies: 181
Views: 16,968
Posted By RGClark
You made some good points here. I found this...

You made some good points here. I found this article from New Scientist while web searching on motorsailing:

The new age of sail.
26 February 2005 ...
Forum: General Discussion (sailing related) 07-24-2006
Replies: 181
Views: 16,968
Posted By RGClark
The situation is made more complicated by what...

The situation is made more complicated by what happens when tacking into a true head wind. In that case you would think that since the wind impinges on the front of the sail, though at an angle, and...
Forum: General Discussion (sailing related) 07-23-2006
Replies: 181
Views: 16,968
Posted By RGClark
It is probably correct that you can't do better...

It is probably correct that you can't do better than using a propeller in the water.
However, that's not the only scenario I'm considering. Fan boats of course have to use fans. It is conceivable...
Forum: General Discussion (sailing related) 07-23-2006
Replies: 181
Views: 16,968
Posted By RGClark
Could you survive? No: Elevator of Death. ...

Could you survive? No:

Elevator of Death.
http://en.wikipedia.org/wiki/MythBusters_(season_2)#Elevator_of_Death

However, it is known that by using sails with a propeller driven craft you can...
Forum: General Discussion (sailing related) 07-23-2006
Replies: 181
Views: 16,968
Posted By RGClark
Thanks for the response. The question is not...

Thanks for the response. The question is not purely theoretical. I'm considering it both for sea cruises and transport and for aircraft to improve fuel efficiency and travel times.
It is known with...
Forum: General Discussion (sailing related) 07-23-2006
Replies: 181
Views: 16,968
Posted By RGClark
That's why you ask questions to get information...

That's why you ask questions to get information from more knowledgeable people.
Are you saying you personally are not aware of any sailboat able to travel faster than the windspeed?


Bob
Forum: General Discussion (sailing related) 07-23-2006
Replies: 181
Views: 16,968
Posted By RGClark
I agree as far as trying to get the greatest...

I agree as far as trying to get the greatest efficiency from the power produced from an engine you very likely would be better off putting that propeller in the water rather than the air.
However,...
Forum: General Discussion (sailing related) 07-23-2006
Replies: 181
Views: 16,968
Posted By RGClark
No, I'm going by what I've read about tacking...

No, I'm going by what I've read about tacking into the wind:

The physics of sailing.
"How can boats sail faster than the wind? Lots of boats can---especially the eighteen footer skiffs on Sydney...
Forum: General Discussion (sailing related) 07-21-2006
Replies: 181
Views: 16,968
Posted By RGClark
No, it is known by tacking into the wind the boat...

No, it is known by tacking into the wind the boat can have greater speed than the wind speed.


Bob
Forum: General Discussion (sailing related) 07-21-2006
Replies: 181
Views: 16,968
Posted By RGClark
It is known with motorsailers that you can...

It is known with motorsailers that you can improve fuel efficiency by using the apparent wind on the sails created by the motor propelling the boat forward. The use of the sails also increases the...
Forum: General Discussion (sailing related) 07-21-2006
Replies: 181
Views: 16,968
Posted By RGClark
Could a fan in front of a sailboat improve sailing?

Hello. Newbie here.
A question sometimes asked is that if you have a large fan on a
sailboat blowing forward into the sails would that propel the boat
forward? The usual answer given is no...
Showing results 1 to 14 of 14

 

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