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- Newsgroups: rec.motorcycles
- Path: sparky!uunet!spool.mu.edu!howland.reston.ans.net!bogus.sura.net!opusc!usceast!ramage
- From: ramage@ece.scarolina.edu (Dan Ramage)
- Subject: Re: All-wheel drive???
- Message-ID: <ramage.727704451@tesla>
- Sender: usenet@usceast.cs.scarolina.edu (USENET News System)
- Organization: USC Department of Computer Science
- References: <1jnmm3$qkg@agate.berkeley.edu>
- Date: 22 Jan 93 12:07:31 GMT
- Lines: 48
-
- robinson@cogsci.berkeley.edu (Michael Robinson) writes:
-
- >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
- ^^^^^^^^^^^^^
- No where even close. An internal combustion engine is around 30%
- efficient and that is probably a little high.
-
- >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.
-
-
-
- >--
- > ----------------------------------------------------------------------------
- > Michael Robinson UUCP: ucbvax!cogsci!robinson
- > INTERNET: robinson@cogsci.berkeley.edu
-