Cd, CdA figures for an impact bumper 911

[prebordao]

I will be using an android app to measure power and torque.
One of the inputs required is the CdA for the car.
Cam anyone help ?

[EdT82SC]

I have read that the SC is .38. A 74 is probably similar.

[RDM]

A '74 is flareless, so should be more similar to a longhood than an SC

[prebordao]

Actually, mine has flares...

But I read somewhere, that the impact bumpers increased (slightly...) the Cd figure.

[panzerfaust]

Originally Posted by prebordao

Actually, mine has flares...

But I read somewhere, that the impact bumpers increased (slightly...) the Cd figure.

From Frere's book

Long nose C&E series .408 Cd
RS 2.7 no spoiler or duck (sc like flares) .409
RS2.7 .397
H series bumper car .423.

S= 1.71m2 CdS= .697 for B series. I'm assuming this is CdA?

Anyone know how awlful the 930's cd is?

[prebordao]

I have Frere's book and I couldn't find the info...
But it does confirm what I had heard - the Cd increased from the long noses to the impacts.

[Bill Verburg]

Originally Posted by prebordao

I will be using an android app to measure power and torque.
One of the inputs required is the CdA for the car.
Cam anyone help ?

[prebordao]

Thank you sir !

[Trackrash]

I find it interesting that on the RS with the front spoiler extension the lift in the rear is increased compared to the RS with the standard front spoiler.

[prebordao]

Originally Posted by Trackrash

I find it interesting that on the RS with the front spoiler extension the lift in the rear is increased compared to the RS with the standard front spoiler.

I think is a question of balance. You press more on the front, you "loosen" the rear.

Didn't the whale tails always had / should be installed with the front lip ?