Posted by Bill McMurtry (211.28.96.38) on January 03, 2003 at 19:10:21:
In Reply to: Besslerwheel vs. centrifugal/centripetal forces... posted by Øystein Rustad on January 03, 2003 at 17:05:38:
Hi Oystein,
Centrifugal force applied to free-to-move-weights within the wheel suggests huge mechanical difficulties when calculated for the uni-directional Draschwitz wheel.
This wheel was reported as rotating at 50 RPM and was 9.13 feet diameter. At this speed centrifugal force applied to a weight at the rim is much greater than 1G. IMO, this raises some pretty serious problems for any system that utilises a purely radial movement of the weights.
At full wheel speed (Draschwitz wheel) it would seem that a weight rotating with the rim would need a crowbar to lever it directly back in towards the axle.
Regards, Bill.
: Hello again :-)
: For the ones int. I thought I should "bable" a bit about how besslers wheel was related to centrifugal forces mathematically !
: In his biggest wheel we can calculate how big the centrifugal forces wore, and from that see if they somehow could be a major factor, an maybe we can find a "lucky" relation !
: Lets see at what RPM the centrifugal forces will be equal to gravity !
: RPM(Fg = Fc) = (g * r)^1/2 * (60 / pi*2r)
: g = 9,8
: r = 1,825
: Resault = 22,1 RPM !
: At this RPM the weights are "weightless" at the top and
: have F = 2g at the bottom.
: We know this wheel rotated at about 24 RPM unloaded and about 20 RPM loaded.
: :-)