What about an airspeed indicator?

[Mini 14]

Just out of curiosity, as anyone made an airspeed indicator for a rocket payload?

 

[Chilly]

Hmm...I think it would add too much weight to be worthwhile. I suppose something that measured G-loading and converted it to velocity would be the best method. A traditional airspeed indicator requires a pitot tube and static port for outside air. The nose cone would be the obvious place to run a pitot tube through. Anyway, all the plumbing and hardware would be counterproductive unless you're just trying to demonstrate the capability.
Not certain, but I believe the aerospike research rocket some TRA members built with NASA/DARPA last summer used something like that.