Hood flew off at 80 mph!!!
Drifting
Joined: Feb 2002
Posts: 1,906
Likes: 0
From: Berlin
I think I remember reading of a prototype 69 ZL1 having the hood fly off at 200 mph. The top of hood was apparently a low pressure region, and it ripped out all the mounting hardware. 200 mph is a lot different than 80 though...
Burning Brakes
Joined: Feb 2002
Posts: 752
Likes: 31
From: Melbourne Australia
I BUY IT.....happened to me too, only at 60mph. I believe a lot of air is rammed into the engine bay at speed and can create a higher pressure zone under the hood. In my case, bubba had stuck the plates back into the hood, after a previous accident, with body filler and painted over the repair 
I did effectively repair the hood with fibreglass, good as new now!
By the way, at high speed, the hoods on almost all cars that open from the rear will rise a few inches at the rear if not latched.
Just my 2 cents
Joe
I did effectively repair the hood with fibreglass, good as new now!
By the way, at high speed, the hoods on almost all cars that open from the rear will rise a few inches at the rear if not latched.
Just my 2 cents
Joe
Burning Brakes
Joined: Jun 2000
Posts: 892
Likes: 0
From: GA
Originally Posted by Vetter Atl
After I autocrossed today, while driving home, my hood flew up at about 80! I almost lost her into a gaurdrail (I couldn't see)! The only thing that held it on was the prop rod and the locks by the widshield! 
Anyway, the front bolts on both sides pulled throught the fiberglass with the reinfocement plates still attached! On closer investigation, it looks like bubba had tried to "fix" it before. So, I need someone who can do good bodywork in the Atlanta area. Do you guys know of someone who is good and fair about the price? Thanks.
Anyway, the front bolts on both sides pulled throught the fiberglass with the reinfocement plates still attached! On closer investigation, it looks like bubba had tried to "fix" it before. So, I need someone who can do good bodywork in the Atlanta area. Do you guys know of someone who is good and fair about the price? Thanks.Sorry to hear this happened. Atleast you're still in one piece! I have a stock hood if you are interested. The hood is in good shape. A small spider in the center from BUBBA air cleaner wing nut. Nothing major, but I have a big block hood now so I never got around to spreading a little resin! Let me know if this would help you out.
Anthony
Drifting
Joined: Sep 2002
Posts: 1,614
Likes: 7
From: South Florida
Gary,
Go unbolt the front of your hood and stick it up above the body work where air can catch it. Take her out for a run and let us know the results.
It really is the only way to know if this is true.
Go unbolt the front of your hood and stick it up above the body work where air can catch it. Take her out for a run and let us know the results.
It really is the only way to know if this is true.
Melting Slicks
Joined: May 1999
Posts: 2,897
Likes: 0
From: Moon Township PA
Originally Posted by WESCH
Hi
Aerodynamics are strange. Think about a wing from an aircraft. It's curved on top and flat on the bottom.
The aircraft flies not because the underside of the wing pushes it up, but because the curved upper side of the wing pulls ( sucks ) it up.
This is caused by the air requiring to travel a longer distance over the curved top surface than over the flat lower surface, hence raising speed therefore reducing the pressure and sucking the wing up.
The hood of the Vette might react similar. Remember that road contact of cars reduces with higher speeds.
Rgds. Gunther
Aerodynamics are strange. Think about a wing from an aircraft. It's curved on top and flat on the bottom.
The aircraft flies not because the underside of the wing pushes it up, but because the curved upper side of the wing pulls ( sucks ) it up.
This is caused by the air requiring to travel a longer distance over the curved top surface than over the flat lower surface, hence raising speed therefore reducing the pressure and sucking the wing up.
The hood of the Vette might react similar. Remember that road contact of cars reduces with higher speeds.
Rgds. Gunther
Gary
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Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
Originally Posted by GaryS
the hood just doesn't have that airfoil shape. Still wondering what the deal is here.
Gary
Gary
Don't only look at the hood's shape, look at the entire car .
On top of the car is definately a lower pressure than below.
That's what makes them lighter at high speed.
On top of this, sinse the lower car side is open to the underside of the hood, that's where the pressure difference is exactly at the hood.
A scoop ( spoiler ) will help it somehow, I guess, but who knows at what speed eihter one winns.
Rgds. Gunther