[Amps] Dummy load specs needed

[Jim Isbell]

I just purchased a :

LOAD RESISTOR

MODEL NO. 639N

M.C. JONES ELECTRONICS CO.

50 OHMS        0-3000MCS.

I would like to find a derating curve for this load resistor.

Does anyone have any suggestions as to where to look.

It is an air cooled dummy load and has a spring loaded bottom plate that 
is open about 3 inches.  I am wondering if blowing air into the bottom 
would increase its capacity in watts.