on 1/3/03 9:32 PM, Bryan Savage at basavage@earthlink.net wrote:
Looking at the Moon Equipment 2003 calendar with the Larsen-Cummins #115
streamliner on it raises another question. Lynn Yeakle designed the body on
that car in the 1960's when he was working for Lockheed at the "Skunk
Works." The car is fairly wide by today's thinking and has the flat Kam
back that was so popular on race cars of that era. I'll have to ask Jeff
Decker if he knows the curvature on that car. Fred gave him a copy of the
original drawings to use in designing the trophy bronze for USFRA. That car
has been so consistent and stable, even with a very short wheelbase that it
deserves to be studied. Probably a wind tunnel model, using that as a
starting point, could tell some interesting things about turbulence. That
flat back is wider than the chute tubes and shorter than the original
drawings. Hard to argue with success however.
Then there's the previously discussed vortex generators that could answer
questions on air management at the rear of a liner. It would be interesting
to see what difference they would make on a design like the #115 car.
Wes
>
> My opinion ....
> To get a very rough idea, I would scale down the fuselage (no wings or
> horizontal tail plane)
> of a Boeing 777. It is designed by some of the smartest subsonic
> aircraft developers around to
> accomplish just what we try to do -- Design an efficient shape that you
> can put stuff in. The tail
> fin doesn't need to be proportionally that big but you do need one for
> stability. The smoother the
> better and if your 1 or 2% short, a good coat of aircraft wax should get
> you there. Another
> thing you could do is go to an airport that has sailplanes. They are
> super low drag and much closer
> to what we use and they may give you some ideas. Talk to the owners if
> you can for answers to
> why ____? Some of them are very knowledgeable.
>
> Bryan
>
>
> W S Potter wrote:
>
>> What about the idea that a 6 degree curve creates the least problems with
>> air separation? If that holds true, the length of the tail from the widest
>> part on the body needs to follow a 6 degree (or lower) taper to the back of
>> the body on as many surfaces as possible. With that in mind you could go
>> back to some of the liners that have run on the salt and figure which one
>> were the slickest. That also sets a standard for future designs. I wonder
>> how much taper there is on Marlo's new liner? How about the Burklands?
>>
>> Wes
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/// what is needed. It isn't that difficult, folks.
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