Here is what you get with a E-flite 3.75x3 (thrust and some speed)
AmpAbuser
Published on Feb 28, 2016
TD .020 Static test per prop calc: Best read: 3.75x3 / 22,790 rpm / 65 mph / 5.3oz thrust / 37w
Plane with engine 142.4g / 5oz dry weight. 35% nitro. With fuel at full throttle it pulled out of my hand straight up.
The engine prop combo is actually making over 5.3oz of thrust.
After bench testing the plane was flown to confirm static results:
TD .020 / 3.75 x 3E Prop / Best Level Pass- 29,554 RPM / 84 MPH / Throttle Sleeve / 35% nitro.
Engine unloaded well down wind do to small size of plane and low weight. Up wind low 70's.
Your plane would still do nice 70ish mph passes down wind with the 3.75x3
Throttle response and thrust is what you are more after and this prop delivers.
Have not had a prop fail yet under engine load. Have lost a few with bad landings.