Yeap, most importantly they are almost flat with very little pitch.

That means the motor spins with higher RPM's will pulling the plane through the air slowly.

However the diameter gives the plane enough "low gear" power to pull it through the air...

So when a newbie guns the engine, the plane does speed up, albeit slowly.

When they throttle it back beyond the pitch speed, the plane slows down quickly to the pitch speed of the blade.

It makes things much easier for the newbie to deal with...

- BUT - to prevent the plane from falling out of the sky in a stall, you need ot have the other training aids on... especially the wing extensions...

On the PTS P-51 the airbrakes cause the nose to pitch down as they slow the plane even more, while the flaps cause the plane to pitch up... so the two sort of cancel each other out.

More experienced people fly the PTS and immediately remove the brakes, turn off the flaps and change the prop...

This changes it's characteristics as a "training" aircraft... so they then complain that it is too fast or unsuitable for a newbie...

Not so, it is just NOT being flown as designed.