There are some things on the gas engines which have not been considered in our discussions, for example, the supercharging system in the YS engines is a great improvement on the regular supercharging found on any two stroke engine(this also depends if the engine has a front intake or rear intake), the two stroke does not create a considerable vacuum when the piston goes down as on the 4 strokes, just because the exhaust port opens before the intake, and that is why the fuel is helped to be pushed in the cylinder by the downward effect created by the piston, so, if a gas two stroke was going to benefit from that, it should have to be a rear intake, with the rotary valve and rings on the crankshaft to hold maximum available pressure, if it is front intake, then the turbo crankshaft will do the trick, but I have only seen this in racing engines like in car or pylon racing engines(all RC I mean), it is not easy at all.

YS are engines created for serious competition, so the big 4 strokes have been created for F3A, not to for lower classes or to make it affordable, so, YS knows they are fighting electrics(they know!), so if they go to a gas version, this gas version will not be as powerful as most top class electrics, and inmediatly will be degraded to a low power motor in comparison, and that is very unwise, as they take a lot of pride in the YS career, and how many lower power engines does anyone think they could sell? and after all the research done, will they get the investment back?, or will they keep producing the most powerful engine on RC instead?(comparable by size, displacement, etc).

YS opened the option to use no Nitro, actually 5% or 10% is the minimum you can get in most stores, and if some one can not cover the cost of fuel, I doubt it can cover the cost of an airframe and equipment for such engine.

I think if it even do not looks like it, there are too many variables in this game that start and end probably with the cost of this hobby, but dreaming of having the best equipment but cheap, is everybody's right.

Pattern is a specialty ( I think is more a specialty than a hobby or sport) and has its followers counted, not that many, and after a long time I came to realize everyone do the best it can to get the best equipment possible within their individual budget, but we are so few compared to the rest of the classes in the hobby, that's why we have to pay so much for everything, we are talking $5000 airplanes half the size and close to double the price of a 40% which looks scale, such dedicated equipment will always be expensive, and a multiple world champion manufacturer will not come out with a cheap version anytime soon in my opinion, of course economics will dictate decisions, always have ,always will.

Remember that not everybody has a power outlet in the field or wants to carry a generator around as it is common in the USA, when I was in Portugal, there were cars with the engine running all day long while recharging batteries during practice, and at $5 a gallon of gasoline................

Some people do, like in the attached picture(extreme to say the least)

I hope everyone can get what they need to be happy in this specialty, now or in the future.

Best regards and happy flights

Alejandro P.