Posted by David (199.60.107.1) on April 25, 2003 at 15:01:59:
In Reply to: Re: General comments posted by David on April 25, 2003 at 14:55:36:
: So when I say that you cannot drive a (roughly) twelve foot diameter wheel weighing (let us be conservative and suggest 100LBS) through two bearings measuring (variously described as) three-quarters of an inch and a quarter of an inch, up to full speed of (roughly) one revolution per second within three turns -and drive a pulley to raise a weight of seventy pounds up in the air several feet, I mean it. It can't be done - unless it is powered from some internal mechanism not connected to the bearings
It is pertainent to put in all information. Thaht weight was also pulled up on a 6 or 8 inch axel, connected (as one source stated) by a 2 inch pulley. Thats a power difference (leverage weight ratio) of 70 pounds to 3680 pounds. In other words if there was 70 pounds around the axel, and another 70 pounds at the outside edge of the wheel(the pulling weight) the outside edge weight would be 3680 pounds relative to the 70 pounds. Or if it was only 5 pound weights it would be 320 pounds to 70. Quite a lot.