Thanks for the info on your Super Easy Delta. I've just checked out a motor for my Push E Cat that seems similar to the Sky Fun one you mention. It's a KMS 31/21 from Hobby People. It has a current range up to 13 Amps and runs on about 140 watts with a 3S battery and an APC 7X5 E prop. A TowerPro 2408-21 has similar specs. Kv is 1750 rpm/V.
I've posted results of a short static thrust test on the KMS motor and get over 16 ounces easily with the 7 X 5.
I looked at that other Hobby partz motor, and it looks way big for anything under 2 lbs all up. No wonder its a rocket with a 40 inch span delta.