did some towing with a rallye 180GT with constant speed prop, you ended up pulling the prop back asap after takeoff to save noise The minervia was the same and gave a loud rasp with the prop fine. great for towing glass but you ended up flying faster speeds. Not great for an early solo in a K8. Cross country retrieve were good but not good for field retrieves. It made engine cool down easy. A brief constant speed to slowly bring down CHT then slowly speed up leaving to power and letting the prop do its thing. worked great and then a high speed decent to join downwind.