Thanks Jan. I have in mind mostly to experiment first with McCulloch 28cc gaz to convert it to methanol using a
carb from BGX-1. Currently the power backward calcualted from measured rpm on a given propeller by the
calculator of Pe is about 1.2 BHP. It is a shameful power for a piece of metal which is about 1200 g and
has 28 cc volume. Similar Fuji engines develop almost twice the power. So this is going to be the
Study "target". The purpose is to fly 2m and 7kg Cessna for fun.

Well the next is the BGX-1. ihave got from RCUniverse discussion some time ago number of very good advices
concerning the gas propulsion inside of BGX, but there was no discussion on making the piston lighter and also
the Problem of Ballancing the Crankshaft-"team". This was the reason for me to place this post here.

In neither of the cases pretty high rpm is possible, because those engines are pretty heavy, thus I can
count only on increasing the torque by lightening the piston and of course making sure that as much as
possible fuel mixture gets burned above the piston.

Since you are very reasonably in favor of the MVVS, then I could possible ask you the question
modified in the following manner:
- What would you do to MVVS-35 cc in order to get from it the similar Power-to-Weight ratio
like on the original MVVS 26 cc ?

I guess the same "relationship" remains in place for the "pairs" of BGX-vs-OS160 and as well
the ST3500-vs-ST2300.

Regards,
Nick