Landracing Forum
Bonneville Salt Flats Discussion => SCTA Rule Questions => Topic started by: Harold Bettes on December 29, 2006, 11:20:30 PM
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Gentlemen of the salt,
Is it legit to utilize some braking panels on a Classic Gas/Coupe category vehicle?
General description would be some panels on each side of the vehicle that could be deployed before the chute - providing a significant amount of aero drag. The panels would be pneumatically operated. Not aero improving devices, but safety devices, making the vehicle aerodynamically "dirty".
The only rulebook that I have to look at is several years old and it doesn't look as if it is addressed (braking panels). :-o
Regards,
HB2
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8-) Is this something like you had in mind? :? I know that you can utilize dirty air as a drag for streamliners, but I can't say for sure for your application. :|
Terry
ps: Suggest that you sketch some of your ideas and present them to the tech guys for approval before building anything. :wink:
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Very similar to the drawing in operation, but the panels would be on the side of a normal production paneled vehicle. Operated with air cylinders to increase the drag, much like "speed brakes" and "dive brakes" on some early aircraft.
I appreciate your comments about submitting to the tech guys before fabrication. That point is quite well taken. Thanks.
Regards,
HB2
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They cannot change the contour of the body. Probably not a good ides on a short wheel base vehicle.
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Initial idea was not to change the contour of the body during timed run, just to make the body dirtier (higher drag number) during shutdown. Sorta like roof flaps that don't get deployed until needed.
Thanks for the comment on the wheelbase. Probably need to look at how the shift in Cp vs CG during deceleration.
Rgds,
HB2
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Initial idea was not to change the contour of the body during timed run, just to make the body dirtier (higher drag number) during shutdown. Sorta like roof flaps that don't get deployed until needed.
Thanks for the comment on the wheelbase. Probably need to look at how the shift in Cp vs CG during deceleration.
Rgds,
HB2
What kind of speed do you anticipate??
c ya,
Sum
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Make sure they deploy exactly the same to a fraction of an inch. If you don't, WHEN, not IF, you are around backwards and the air catches them in a tangled chute you will be in for a fun ride and we will be sending out patrols to pick up the pieces once again holding up the meet...Good Luck.
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Not a good idea.
I have a T-shirt that says " It seemed like a good idea at the time."
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Ok Guys,
You caught me. I would never have deployed the brakes for the fear that they would not be the same and toss in too much yaw. The whole idea was to merely have the tech guys not look in an area that was so obvious! LOL Jack's comments said it oh too well.
Thanks to all,
HB2
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By the way Sum,
The target speed is about 225, but I will be lucky to go a solid 150 if Mr. Murphy has his way.
Regards,
HB2
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Using air brakes on a short wheel base coupe is like opening a suicide door on my old 34 coupe. Sure creates a lot of crap you don't want to experience.
The other thing if there is a cross wind there will be a low pressure side and a high pressure side, hence the excitement begins. :roll:
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[quote author=Harold Bettes I will be lucky to go a solid 150 if Mr. Murphy has his way.
don't worry about murphy and his law - beware of otools comentary "murphy was an optomist " Glen mentioned air brake on 34{door} hasn't happend on mine yet=but it did to somebody on my essex befor I got it- tough on doors.
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I will just be content to get there, pass tech, have a breather and see if the pig would start. The rest would be just plain ol' icing on the cake.
Lots of stuff on my plate right now, but just like eatin' an elephant with a plastic spoon - a little bit at a time. :-D
Regards to All,
HB2
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2 cents hypothetical..
So it makes me think, what about a narrow centered air brake on the cowling?
Out of change ..
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Or on the tumble-home, like a rumbleseat/wing
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I think I would rather throw out a brick on a rope.
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Since a chute is required anyway over 175 and everyone seems to stop fine why go to the trouble?? Heck Tom even managed to stop at his pits after a 410 mph run during that private meet without pulling the chutes. Something I would not recommend trying :wink:.
Of course this is coming from someone who always makes the easy difficult :evil:.
c ya,
Sum
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In 91 when I ran FIA Cat A Group 1 Class 9, Ed was not there so I didn't think that with our crew being short-handed that we would have time to also repack the chute, do the service and turnaround thing within an hour. So on the down run, I did not pull the chute, just coasted to the 11 mile. I did let Cagle know before the run, so no one would panic.