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- From: robinson@cogsci.berkeley.edu (Michael Robinson)
- Newsgroups: rec.motorcycles
- Subject: All-wheel drive???
- Date: 22 Jan 1993 02:37:55 GMT
- Organization: Institute of Cognitive Studies, U.C. Berkeley
- Lines: 42
- Distribution: world
- Message-ID: <1jnmm3$qkg@agate.berkeley.edu>
- NNTP-Posting-Host: cogsci.berkeley.edu
- Originator: robinson@cogsci.Berkeley.EDU
-
- I was talking to a friend the other day, and he told me about a motorcycle
- show he went to a while back.
-
- He claims he saw an old Spagthorpe prototype that had a driven front wheel.
- It was a water-cooled bike, but instead of a radiator, it had sort of a
- boiler affair. They ran steam lines down the front forks to a steam
- turbine in the front hub (the hub apparently looked sort of like a
- front drum brake type deal). The clever part was the centrifugal vane
- advance on the turbine which would adjust the vanes for maximum torque
- when stopped, and maximum power at speed.
-
- I was sort of skeptical, but he explained the reasoning behind it: an
- internal combustion engine is only about 70% efficient, with the rest
- being lost to heat. If you only get 50% efficiency out of the steam
- turbine, that's still 15% power that would otherwise blow away in the
- wind. 15% power to the front wheel may not sound like much, but
- proportionally, it's similar to the amount of efficiency you get out of
- a rear brake. So, when you look at it that way it doesn't seem so
- unreasonable.
-
- The goal behind the driven front wheel design was similar to that of
- 4-wheel drive cars--increased cornering stability, and better control
- on surfaces with poor traction.
-
- I was concerned about the effect of the additional unsprung weight in
- the front wheel, but my friend just said, "Hey, it's a Spagthorpe."
- Good point. Apparently these bikes were never made in quantity, because
- the cost of British union steamfitters would have made production bikes
- prohibitively expensive.
-
- My friend said he had some pictures he could show me, but he just moved
- and hasn't unpacked them yet. I was just wondering if anyone else has
- seen or heard about this bike. The idea sounds sort of interesting; I'm
- just wondering how practical it would be. I mean, it sounds like some
- of the things Honda has come up with.
-
-
-
- --
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- INTERNET: robinson@cogsci.berkeley.edu
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