Hello
Nice engines, gook look.
You will be happy with the Mcculloch, I am flying my plane, near 14 pounds, (6,4 kg), with it.
I have repowered with Mcculloch 28cc , nice engine , lot power, because I coming from Weedeater 25 cc.
My plane photos and the Mcculloch in the nose in the post :
Weedeater XT 250 broken bearing.
I have registered 4 kg static thrust , scale on the tail of plane, and a propeller made in house.
Happy landings
Jose