Quote:
Originally Posted by Ken Fry
Thanks for your comments, here, and elsewhere. I put the template over an SM image, and it is not until the very aft edge of the backlight that the angle goes to 24 degrees. At the top of the backlight frame, it is about 11 degrees. I could be off in both cases by a couple degrees. The SM actually rode a little nose-low, I think -- at least the picture I used seemed about like my old one. But clearly the backlight begins to drop away from the template at its forward edge.
I agree it would be interesting to see the whole back end tufted.
It would also be fun to reposition the self-levelling linkage, to raise the rear and lower the front. Makes me wish I still had the car. Somewhere there is probably a fully meshed SM model sitting in someone's CFD machine.
Regards, Ken
Oh, and no insult taken at all re your Nuna post. I enjoy all your posts.
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In my photo,I can't tell if the hydro-pneumatic suspension is not pumped up,or if the car has been lowered,as would be likely for a dry lakes racer.The front wheel is up in the well pretty far.
The 'rake' seems like in Chaz's photo.It's hard to know if any of the dimensions are in true-length or not.
In 1970 Citroen published an ad for the GS,with Cd 0.38.This photo is in true-length and the rear slope was 25-degrees.You can see the smoke immediately detach just as the roof-line falls away and follow a path no steeper than 17-degrees at the tail of the car.If you take a french-curve and extrapolate Citroen's body it creates a tail with maximum 27-degrees slope,violating Mair's limit by 5-degrees.
This car has a length-to height ratio of 2.913.
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The racing SM has a L/H ratio of 3.704,really good!
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The CX that Setright tested achieved an indicated 124 mph on 82 bhp.Very impressive!
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In 1980 Motor Trend did a small article on the GSA with Cd 0.345.The X3 version had a rear deck spoiler which cut drag to Cd 0.318.( an RX-7 of the day was Cd 0.340) With 1.275-liter engine,the GSA would return 28 mpg at 75 mph.Pretty sweet for a 4-dr sedan!
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Perhaps a new member will surface,who owns a Citroen.It WOULD be fun to tape yarn all over it!
