06-29-2023, 04:52 PM
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#31 (permalink)
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Quote:
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how much grip a particular car/tire has on the road, and how it can be used.
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07-01-2023, 05:35 AM
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#32 (permalink)
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07-01-2023, 11:58 AM
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#33 (permalink)
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Ultimate Fail
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Thanks everyone for the replies.
Lots of great ideas, but I really wanted to go cheap and simple on this one.
I spoke with a guy at the hobby store. He liked the idea, but said that it would strip the gears when the flap would go down ( air and gravity force ) if I were to use a large R/C servo.
I may still persue the idea in the future. Just to get an idea of how it all might work, I'm thinking of just using a cable and doing it by hand.
This of coarse would just be to test what kind of force is needed to raise the flap.
I'm guessing a considerable amount, since a large plate sized flap moving up into 80 mph air is going to have quite a bit of force.
I want to have it be automated using the electrical signal, since doing it by hand and applying normal brakes would be very cumbersome and dangerous.
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07-01-2023, 03:00 PM
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#34 (permalink)
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aero guerrilla
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One more thing to keep in mind: Should the roof be reinforced to handle additional force at the point of mounting the air brake?
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e·co·mod·ding: the art of turning vehicles into what they should be
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[Old] Piwoslaw's Peugeot 307sw modding thread
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07-01-2023, 05:15 PM
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#35 (permalink)
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Ultimate Fail
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Excellent tip !
I planned to have the pivot point right at the area that the hatch opens, but it would be attached to my coroplast Kammback / boattail.
I hadn't thought of the added pressure.
Btw, the airbrake "speedbrake" would be coroplast, but with aluminum bracing.
I actually like that this is is a challenge to think out.
It's on the back burner though after other things are sorted out.
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07-02-2023, 09:45 AM
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#36 (permalink)
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Somewhat crazed
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Back in he WW2 days, on the heavy bombers with massive control surfaces there was a thing called an anti servo tab which one moves instead of move the control surface.
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07-02-2023, 12:38 PM
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#37 (permalink)
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Fuller maintained that being a contrarian can change the World.
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07-03-2023, 09:05 AM
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#38 (permalink)
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Quote:
Originally Posted by freebeard
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As long as you never have to back up.
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07-04-2023, 09:52 AM
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#39 (permalink)
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Somewhat crazed
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Quote:
Originally Posted by j-c-c
As long as you never have to back up.
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In my experiences, no it don't work that way. Not that you will be backing up at speed.
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07-05-2023, 07:14 PM
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#40 (permalink)
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Ultimate Fail
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Quote:
Originally Posted by Piotrsko
Back in he WW2 days, on the heavy bombers with massive control surfaces there was a thing called an anti servo tab which one moves instead of move the control surface.
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Thanks ! I'll look that up.
I was looking at my car's roof.
Along the rear edge, there are several large dents that were created when some kids stole the car and resorted to smashing the car to get my Kammback to come off.
I don't want to drill into the car, BUT this area is already battle damaged, so I'm considering adding a hinge connected to the roof sheetmetal ( sealed with caulking at any rivet points )
As a bonus, the airbrake would make a good transition strip to the start of the new Kammback/boattail.
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