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Lynn · 02-01-07, 09:12 AM

Graham,

I'm with Tom, more info please sir? What chassis was this.

Tom,

While the 40 does lighten up at speed:

Lift/Drag for the MK II
100 lbs. @ 150 mph, with 525 lbs. of drag
144 lbs. @ 180 mph, with 756 lbs. of drag
177 lbs. @ 200 mph, with 933 lbs. of drag

And I have heard numbers like 10% of the cars weight

Unless you are up well over ≈ 170 in a plane MK I replicar, you are not going to start flying; even then I think the issue is more one of degredation of handling than reaching Vr (airplane speak for speed for rotation.) Now it sounds like you are more familiar with this particular crest than I am, but GT40s will obey the laws of physics and if conditions are just right and the upward vector of inertia is large enough and some outside force (aerodynamics) doesn't intervene, up she gos. With a wet track and a corner to deal with, it doesn't take much loss of directional control to get in very bad shape.

Lynn

02-01-07, 09:12 AM	#25 (permalink)
Lynn llarsen Admin Join Date: Jun 2003 Location: Raleigh, NC GT40: Sabre Posts: 2,073 Rep Power: 29	Re: Frontal Protection in a '40 Graham, I'm with Tom, more info please sir? What chassis was this. Tom, While the 40 does lighten up at speed: Lift/Drag for the MK II 100 lbs. @ 150 mph, with 525 lbs. of drag 144 lbs. @ 180 mph, with 756 lbs. of drag 177 lbs. @ 200 mph, with 933 lbs. of drag And I have heard numbers like 10% of the cars weight Unless you are up well over ≈ 170 in a plane MK I replicar, you are not going to start flying; even then I think the issue is more one of degredation of handling than reaching Vr (airplane speak for speed for rotation.) Now it sounds like you are more familiar with this particular crest than I am, but GT40s will obey the laws of physics and if conditions are just right and the upward vector of inertia is large enough and some outside force (aerodynamics) doesn't intervene, up she gos. With a wet track and a corner to deal with, it doesn't take much loss of directional control to get in very bad shape. Lynn __________________ Sabre GT40/5L EFI/G50/50 Always verify parts or products discussed for your own use.