How to build an airplane engine from garbage DIY

Beetle engine conversion to 2 cylinder boxer airplane engine, called half VW
4 stroke DiY engine, tecnical data: 1200 ccm (73 cui), 86 stroker crank, 94mm cylinders
43 HP at 2800 rpm (static) now with some fine tuning 47 HP
105 Kg (230 lbs) static thrust @ 31°C (~88 F)
47 kg (105 lbs) weight in order to fly, icluding all fluids, prop and exhaust.
2 Koso 28 mm motorcycle carburettor (better 24 to 26mm)

Engine in action first time:
https://www.youtube.com/watch?v=4mFRWckrZGc
smooth idle running with no vibration:
https://www.youtube.com/watch?v=lUNktoVagjU
Thrust test at 30 deg Celsius, idle at stable 700 rpm:
https://www.youtube.com/watch?v=GGmQyhAArjE
Build report on german forum:
https://www.motor-talk.de/forum/motor-halbieren-und-es-wird-ein-flugmotor-t5917680.html

2 Koso 28 mm motorcycle carburettor (this is the upper limit and harder to tune and power increase is marginal, but this is what i had at home :) Better from 24 to 26 mm carb size, easy tune
105 Kg (230 lbs) static thrust

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