Hi Dennis,
I wasn't flying that one fast at all. And it would fly just a tad bit slower than the regular Streak. I found that the Streaks and other profiles that size liked to fly around 4.8-5.0 on 60' lines while the Combat Streak would fly at up to about 5.3. I was using it for stunt, not combat.
Purely personal preference.
Now, I had a plans built Zero from Flying Models. 40" WS, short fuselage, .36X, 9-8 Power Prop
and Missle Mist. Launched usually from a speed dolly. It was pretty quick!
Bill