Where does time go?

I can't believe that Feburary is almost over.  Due to my day job, I haven't had much free time to work on the new N2O-propane motor.  However, today I finally finished mounting it on the test stand.  I intend to test ignition and thrust levels using very short duration tests.  After I've gotten that worked out, I will go through the trouble of adding the regenerative cooling to the chamber.

The Rest of the Story

Here are the results for the other two cases...

M 1.851

p 29530 Pa

rho   0.398 kg/m^3

T 258.4 K

V 596.4 m/s

Drag 1750 N

Cd 0.764

M 0.936

p 27640 Pa

rho 0.377 kg/m^3

T 255.6 K

V 300.0 m/s

Drag  327 N

Cd 0.596

Unreasonable Request

I offered to run some CFD for Paul Breed of a simple "rocket like" geometry - a 8" by 8' tube.  I picked an arbitrary ogive nose cone and a bluff tail.

Here is the Mach number contour for the 150 m/s case.

The free stream conditions were:

M 0.468

p 27580. Pa

rho 0.376 kg/m^3

T 255.4 K

V 150.0 m/s

Drag 55.1 N

The calculated Cd is 0.40.   300 m/s and 600 m/s results to follow.