G MWTN Hirth F23 static thrust test

This is a Shadow CD with a Hirth F23 50hp engine instead of the Rotax 503. The propeller is two blades of a 3-bladed cut down GSC prop normally fitted to the 912 powered Shadow. Not the most efficient. Maximum trust was 86kg (844 Newtons) at 6500rpm. The shaking of the tail feathers in the prop wash is not as alarming as it looks. This calms down as soon as there is forward speed.