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- Xref: sparky sci.environment:9717 sci.physics:11319 sci.energy:3496
- Newsgroups: sci.environment,sci.physics,sci.energy
- Path: sparky!uunet!elroy.jpl.nasa.gov!ames!eos!aio!sweetpea.jsc.nasa.gov!mancus
- From: mancus@sweetpea.jsc.nasa.gov (Keith Mancus)
- Subject: Re: Is car pooling for real? (was Re: Are bikes really less pollutin
- Message-ID: <1992Jul22.030414.23536@aio.jsc.nasa.gov>
- Sender: news@aio.jsc.nasa.gov (USENET News System)
- Organization: McDonnell Douglas Space Systems Company
- References: <1992Jul15.161206.7337@aio.jsc.nasa.gov> <JPX2NB2w164w@musubi.pubnet.com> <JMC.92Jul21175813@SAIL.Stanford.EDU>
- Date: Wed, 22 Jul 1992 03:04:14 GMT
- Lines: 43
-
- In article <JMC.92Jul21175813@SAIL.Stanford.EDU>, jmc@SAIL.Stanford.EDU (John McCarthy) writes:
- > For example, a Mooney 201, which is pretty crude
- > technology today, can cruise at >180 mph and tops out around
- > 200 mph on 200 HP. This is a four place airplane (thought
- > I'd be the first to admit the back seats are pretty small).
-
- > Is Mr. Marcus suggesting that there has been much advance in
- > light plane technology since the Mooney came out?
-
- First of all, it's Mancus, not Marcus. Not a flame, just a correction.
-
- > As I recall, the Mooney Mark 21 got about 20 miles per gallon at
- > about 150 mph, which was very good for a usable light plane.
-
- The Mooney was and is a good lightplane. But the Ranger was designed
- in the 50's, and the 201 is really just a cleaned-up Ranger with a 200 HP
- engine and some engine tuning.
- But today, we have light aircraft which support massive laminar flow,
- more aerodynamic surfaces (due to the compound curves made possible by
- composite materials), and generally better design practices. We have
- laminar flow airfoils that are optimized for the flight regime of
- these aircraft, unlike the 6-series airfoils.
- Look at a plane like the Lancair IV, which set a speed record nonstop
- from California to Oshkosh of ~360 mph. This is a four-place airplane
- powered by an IO-540 (300 HP). Show me the 1960's equivalent!
- A record in class C1a/o (under 664(?) lbs) was set a couple of years ago.
- This single-place aircraft was clocked at 126 mph with a small snowmobile (?)
- engine of < 30 HP (sorry, I can't remember exactly; could look it up if
- anyone cares). The equivalent flat-plate frontal area of this bird
- works out to slightly more than 1 ft^2.
- Last time I looked, the LongEze, designed by Rutan, held all the C1b
- distance records. Rodie Rodewald flew nonstop from Hawaii to Sacremento
- and landed with 12 hrs of fuel still in the tanks. Show me the 100 HP
- 1960's aircraft that could do that. Dick Rutan's straight-line distance
- record, set with his (160 HP) Long-Eze, was > 4500 miles.
- Some people may have been fooled by looking only at certified,
- production aircaft. For political reasons involving liability laws and
- FAA certification, these aircraft have stagnated and the industry is
- all but dead. Practically all of the real innovations in design introduced
- since 1970 appeared in homebuilts or kitbuilts first. If you want a
- truly modern 1990's aircraft, you must built it yourself.
-
- -Keith <mancus@sweetpea.jsc.nasa.gov>
-