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Capps Body scraping.
- Thread starter Butch
- Start date
Treeshaker
Nitro Member
That is on purpose. All the big show bodies are mounted so that they flex as they gain speed and should stay just a fraction of an inch above the track surface. They can adjust the saddles that contact the framerails at speed to keep it from actually dragging the track.
It's purpose is to keep all of the air from going under the car.
jackass
Nitro Member
you left off in theroy... sealing the front down it forms a slight vacum under the car to help with down force also.... (some says it does.. some say it dont....) mostly it limits under body turbulance which can disrupt a cars stability at high speeds...
jackass
Nitro Member
The 60ft and other beams are alot higher than the stage/prestage beams... so it so it would be a bit differnt.. plus if you watch most of hte FC bodys dont flex down till the 330 mark or the 1/8th mile all in how they set it..
jackass
Nitro Member
not sure on the exact hight... but its from 6 to 8 inches.. i think...lol. iw ould say the difference isnt as much as you would think.. and its ALOT closer to reality than what NASCAR uses....(NASCAR measures track distance 10 feet from the outer wall... never mind they give a MPH and a timed reading off that distance even though they run cars run 30ft or more from the wall and a MUCH shorter distance.... If the track is a "Measured Mile".. the true driveline of the track would be possibly 9/10th of a mile)
Jamie
Nitro Member
Most cars trip the finish line beams with the nose. Stage beams are very low and the finish line beams are higher (8" IIRC).
TF CREW
Nitro Member
that would be front tires(plural) FC and TF have the front tires(spindles) staggered
Bross Hawg
Nitro Member
If you look at a lot of the comp and super comp, gas cars, they have extensions off the front of the car to meet the minumum length requirement. They stage with the front tire and trip the finish line beams with the extension...
John Capps Sr.
Nitro Member
and if the car is long enough, it will get there before it has left...!!!
John Capps Sr.
PS: I think the title of this thread is misleading as I suspect Ron takes showers like normal people...!!!
Bullet
Nitro Member
PS: I think the title of this thread is misleading as I suspect Ron takes showers like normal people...!!!
Normal people don't sing the "NAPA KNOW HOW" song in the shower....
John Capps Sr.
Nitro Member
Normal people don't sing the "NAPA KNOW HOW" song in the shower....
Point taken...!!!
Bross Hawg
Nitro Member
and if the car is long enough, it will get there before it has left...!!!
John Capps Sr.
PS: I think the title of this thread is misleading as I suspect Ron takes showers like normal people...!!!
If you staged with the rear tires...
Nick Name
Nitro Member
Nemo
Nitro Member
Only the staging beams (Pre, Stage, and Guard) are really low (around 2 inches when I measured our local NHRA track). After that all the beams are 5-6 inches (also measured at my local NHRA track). When I asked years ago I was told so if the car is lightly carrying the front wheels the body can trip the beams (or if the nose is up like a lot of the suspended cars do the wheels will still trip it). As far as speed not being accurate, it is the most accurate of all I would think. The speed is only measured in the last 66 feet and both of those beams are mounted around 5-6 inches so if the body is tripping them (and I'm sure on a FC it is) then it's apples to apples (the body is tripping it both times). Now ET, that may be a hair shaded since the wheels start it and the body stops it, but it's been like that (Beam height) for decades. Fudging it even more, I think a lot of those cars stay in the stage beams the whole time (rollout and body height) so they are probably hitting the guard beams and starting the clock with those getting a little run-up on the Finnish line. Not a big deal though, like before, I think it's always been that way and all those FC are set up the same way so they are even in doing it.
John Capps Sr.
Nitro Member
My father-in-law was "Head of Aero. Dept." here at Cal-Poly SLO and I was lucky enough (living next door) to spend years with him (usually sitting on the front porch over a beer or two) talking race car dynamics and stuff and having the body low to seal off the front does help the downforce a lot. Nothing new there. I believe Dr. Kahm lead the way in automobile areo back before WW11 ("Kahm-Back" little spoilers and wings on the back of station wagons for instance) good reading if you can find it.
John Capps Sr.
jackass
Nitro Member
While i wont say who did it... and dont laugh at where my expericne comes from.. but i learnd about areo form a 1/10th scale tunnel...built by a r/c car company...lol... learned how to add tape skirts around the bodys that would fold when the car squated but pop back up on the straits... a Cup crew chief in the 90's saw me do it at an r/c race and asked.. found out later that he tried and got away with something like that at a couple Cup races till some one complained...lol
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