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- From: smith@ctron.com (Lawrence C Smith)
- Newsgroups: rec.autos,rec.autos.tech
- Subject: Re: Saturn Polymer Side Panels - How tough ??
- Message-ID: <5869@balrog.ctron.com>
- Date: 6 Nov 92 16:07:45 GMT
- References: <Bx9F3I.53L@mentor.cc.purdue.edu> <1ddo31INN2h3@rave.larc.nasa.gov>
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- Organization: Cabletron Systems, Inc.
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- In article <1ddo31INN2h3@rave.larc.nasa.gov>, ghee@vision.larc.nasa.gov (Terry A. Ghee) writes:
-
- >Michael G. Mshar writes:
-
- > As for structural integraty, all the body panels really do is give the car
- > its looks and make for its aerodynamics. Unlike other automobiles, the
- > Saturn has a steel cage frame that simply has the body panels attched to
- > it. So assuming this cage frame is structually sound, I would say that the
- > car is just as strong as any other car this size.
-
- The name for this system is "space-frame" construction. It is used almost
- exclusively in racing cars.
-
- > The best comparison I can
- > think of is an airplane. An airplane is simply a frame structure that is
- > covered with body panels for aerodynamics and looks. Same thing for the
- > Saturn.
-
- Airplanes are _not_ spaceframe, at least none that I know of. They are
- monocoque (unitized).
-
- >As for airplanes, the skin is not just for good looks and aerodynamics.
- >It is an integral part of the structure. Without the skin taking some
- >of the stress, the frame would not have enough strength to still fly!
-
- Most planes are what the Europeans call "monocoque" construction. In the
- US we call it "unitized" or "unit-body", sometimes shorted to "unibody",
- and it is the way most all cars are built in the US and Europe, except for
- a tiny handful that are still body-on-frame, where the subframe carries
- the whole structural requirement, and the body just "rides" on top of it,
- and a somewhat larger handful of space-frame cars, like the Saturns. The
- body-on-frame cars are the Ford Crown Victoria/Mercury Grand Marquis,
- the Lincoln Town Car, and the Chevy Caprice/Buick Roadmaster/Cadillac
- Brougham. Most larger pickups and sport-utes (like the Suburban) are
- body-on-frame, as well, though many smaller ones are unibody. Space frame
- cars are mostly GM: the GM minivans, the Saturns, the Corvette, etc.
- The Fiero used to be.
-
- >I'm not sure about the structure on a unibody car, don't know how much
- >or if the body panels.
-
- Unibody _does_ depend on those panels, but frame and spaceframe vehicles
- do not. That's why the Fiero, which was space-frame, and the VW and Pinto,
- which were frame, are so popular for kit cars. Unibody cars make it _real_
- hard to take the skin off. I can only think of a couple of unibody cars
- that have rebody kits (mostly GM F-cars).
-
- Larry Smith (smith@ctron.com) No, I don't speak for Cabletron. Need you ask?
- -
- Liberty is not the freedom to do whatever we want,
- it is the freedom to do whatever we are able.
-