Looking good, I just finished 2. Hope your bevel gears are better that the ones I purchased. They were (looked like to me) 3d printed and not well at all. They were not concentric with the hole and lopsided.
quick questions ... on the flywheel rep 12 there are 5 holes Ø 11 and 1 hole Ø 8, why? do you have to orient the flywheel in relation to the piston?
can the engine run without the blades? or they are useful to have inertia?
Excellent question I know mine tremble a bit when running but I never spent any time changing the position to see if it would help. Maybe I should spend some time and see. So in short I don't have an answer for you. I may have just gotten lucky and have the positioned close to oppisit the piston. I'll need to check on that next trip to the shop and see. I would venture to say yes the smaller hole is there to take some of the shake out, I never even gave it any thought but I will now lol.
It does help a little
When I first ran my version I ran it without the tail rotor assy or the main blades
One thing I found made a difference to the engines speed was to fit a ptfe washer between the flywheel and the lower main bearing.
No blade are not necessary can be run with out. I have mine set up with the small hole in flywheel towards the tail with the power piston at top of stroke and the vibrations are minimal funny how I have both the same as it happened just by chance. lol