I discovered the secret to flying 1.5cc diesels ,

Build real light

I used 0.7mm ply each side of 1/4 by 1/4 bearers, with a 1/4 balsa profile fuselage

and a foam core wing, covered with brown paper ,with a half span 1/8 th inch thick spar that has 0.7mm ply on each side of it

.008 thou lines about 42 feet lonf with a light plastic handle

And I use a 2.4mm landing gear music wire with a 2inch electric lightweight wheel , i will go to a 2mm piano wire leg as its real light and it will bend a little each landing , but that is OK

And I use 1.5mm pushrod wire with a middle brace to stop flex , it really motors around for a tiny diesel

and real tail heavy so it reacts fast

And I use 2.5mm bolts to hold the engine in with an Aluminium prop washer

Not to mention carving away internal motor parts such as the cylinder, and other parts and lighter contra piston and piston and hollow tommy bar