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Boys and their Toys

Posted: May 5th, 2013, 5:38 pm
by Lmo
Rail Track Racers, circa 1930
The cars were attached to a pair of ball bearings mounted on the front and back axle and guided by a rail on the track which added more fun for the spectators. It was like “real” racing. Rail racing enabled more than one car to be on the track at the same time.

source: http://tethercar.net/index.html
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Tether Track Racers

Earlier

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Later

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206 mph.


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http://www.jalopyjournal.com/forum/show ... &showall=1
http://tethercar.net/carphotos.php
http://tethercar.com/
http://www.amrca.com/

Re: Boys and their Toys

Posted: May 6th, 2013, 9:39 pm
by sanjy009
Lmo wrote:
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That 'Bluebird' is beautiful.

Re: Boys and their Toys

Posted: May 6th, 2013, 11:37 pm
by choto
Wow, that video really brings the speed into perspective! The sound it makes at full speed at the 1 minute mark is terrifying

Re: Boys and their Toys

Posted: May 7th, 2013, 1:44 am
by Lmo
Kind of makes you wonder what would happen if the guy slipped before he could hop up on the little step. It probably wouldn't take more than a second or two to wind up his leg.

Re: Boys and their Toys

Posted: May 7th, 2013, 1:32 pm
by Primo
How does it stay on the ground at those speeds? It seems like it would have to be an extremely smooth and perfectly level surface, or is the tether really heavy?

Re: Boys and their Toys

Posted: May 7th, 2013, 2:32 pm
by Lmo
Here's the link to the tech rules. > http://www.amrca.com/about/tech.htm > Rulebooks > WMCR Rule Book

Track construction detail are on page 22 -26, but I did not see any spec for "flatness", or surface finish. There are a couple of "how to build a track" article and in them it is suggested that a transit be used to level the form work; you can get pretty tight with a good laser transit, but we're still talking "fractions", not thousandths of an inch. The center pole is required to be what looks to be 2" solid steel bar. Not a cheap hobby by any means. Check out some part prices.

Max car weight,depending on class, looks like about 6-1/2 pounds. The cable diameter is dictated by class and speed; ranging from 0.035" - 0.078" diameter. Increases in wire diameter, per class, are required when exceeding given speed ranges. Obiviously they don't change the wire diameter on the fly, it is determined by the speed they will attempt to reach.

Engine displacements: Class I @ 1.5ccm through ClassV @ 5-10ccm

Weights: Class I; 2 pound, 5 ounces through Class V; 6 pounds 14 ounces.