1973 1974 Charger spoiler lift charts - "Petty-sized" from Gary Romberg

[odcics2]

Finally found the charts I got from Gary Romberg back in the mid 70s.

A "Petty-sized" front spoiler cuts lift IN HALF, at any speed.
Pretty dramatic improvement that is easily felt. 
It only takes a 1/2 inch on the deck lid to stop any lift!

[odcics2]

side view & front

[draftingmonkey]

Interesting. Thanks for sharing.

[RallyeMike]

Thanks for these. Very interesting!  

I learned these lessons on my own. It was fun to go through it and discover the impact at speed. The car went from "floating around" to "slot car" with addition of the front air dam and rear spoiler. I ended up decreasing the the angle of the rear spoiler by more than half after the first run at 150+. It was clear that it slowed me down more than anything.

I have an appreciation for what these guys did 40+ years ago!

Thanks again.

[hemihead]

 I was reading this post and the enclosed data . Found it very informative , thanks ! Does anyone have the dimensions or the blueprints to make the
front and rear spoilers ?

[odcics2]

I was reading this post and the enclosed data . Found it very informative , thanks ! Does anyone have the dimensions or the blueprints to make the
front and rear spoilers ?

Width is centerline of each frame rail. Angle is 45 degrees. Depth is 6.5" from the track minimum.
Rear spoiler was as wide as the deck lid.  Angle was TBD per track.

[tan top]

interesting stuff 

[hemihead]

I was reading this post and the enclosed data . Found it very informative , thanks ! Does anyone have the dimensions or the blueprints to make the
front and rear spoilers ?

Width is centerline of each frame rail. Angle is 45 degrees. Depth is 6.5" from the track minimum.
Rear spoiler was as wide as the deck lid.  Angle was TBD per track.

Thank You ! I assume they are like 1/8 " Aluminum .
I appreciate the help .