Agreed. Something pre-existing was slightly modified to suit an application.

Some people seem to feel that RC engines are a large portion of gas engine sales and therefore deserve greater attention to production detail. That perception is far from the truth. RC makes up only a tiny fraction of gas engine sales and are not large enough on the radar to specialize in, especially if a serious living was desired to be made of it. A new product will generate a lot of initial sales but after the first sales surge things die off quickly. The ohh and ahh factor if you will. There is little in the way of sustainment to provide a continued revenue stream.

To confirm the above all one needs to do is look around the next time you go to a flying field. What is the proportion of gas engines to glow on any given flying day? The next verification can be found in the RC magazines. What percentage of articles are devoted to gas engine use?