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Author Topic: Air Drag Brakes  (Read 7259 times)

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Offline Harold Bettes

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Air Drag Brakes
« on: December 29, 2006, 11:20:30 PM »
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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Offline Loose Goose-Terry#1

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Re: Air Drag Brakes
« Reply #1 on: December 30, 2006, 01:03:19 PM »
 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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Offline Harold Bettes

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Re: Air Drag Brakes
« Reply #2 on: December 30, 2006, 01:53:40 PM »
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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Offline Glen

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Re: Air Drag Brakes
« Reply #3 on: December 30, 2006, 02:40:03 PM »
They cannot change the contour of the body. Probably not a good ides on a short wheel base vehicle.
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Offline Harold Bettes

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Re: Air Drag Brakes
« Reply #4 on: December 30, 2006, 03:23:42 PM »
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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Offline Sumner

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Re: Air Drag Brakes
« Reply #5 on: December 30, 2006, 03:27:29 PM »
Quote from: Harold Bettes on December 30, 2006, 03:23:42 PM
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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Online jimmy six

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Re: Air Drag Brakes
« Reply #6 on: December 30, 2006, 05:24:15 PM »
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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Offline JackD

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Re: Air Drag Brakes
« Reply #7 on: December 30, 2006, 05:39:02 PM »
Not a good idea.
I have a T-shirt that says " It seemed like a good idea at the time."
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Offline Harold Bettes

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Re: Air Drag Brakes
« Reply #8 on: December 30, 2006, 06:14:36 PM »
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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Offline Harold Bettes

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Re: Air Drag Brakes
« Reply #9 on: December 30, 2006, 06:19:23 PM »
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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Offline Glen

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Re: Air Drag Brakes
« Reply #10 on: December 30, 2006, 06:34:53 PM »
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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Offline russ jensen

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Re: Air Drag Brakes
« Reply #11 on: December 31, 2006, 01:44:07 AM »
[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.
« Last Edit: December 31, 2006, 10:52:41 PM by russ jensen »
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speed is expensive-how fast do you want to go?-to soon old & to late smart.

Offline Harold Bettes

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Re: Air Drag Brakes
« Reply #12 on: January 03, 2007, 11:16:01 PM »
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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Offline Greyboy

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Re: Air Drag Brakes
« Reply #13 on: January 04, 2007, 08:08:10 AM »
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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Offline Greyboy

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Re: Air Drag Brakes
« Reply #14 on: January 04, 2007, 08:11:27 AM »
Or on the tumble-home, like a rumbleseat/wing
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