The Idea that the 555 cannot be used in glow/gas aircraft or had reduced range is patently absurd.

That Rx was in fact my favorite of all time. I own around twenty three and after the last purchase was disappointed to discover that they were discontinued. I own only one electric. Almost all are use in glow airplanes and airplanes the exceed speeds of 165 mph with forty size engines that routinely exceed 20,000 RPM. That is an extremely harsh vibration environment And the 555 performed and survived better than most other so called standard Rx's from a variety of manufactures.

I can only make the following statement:

You can runoff with my wife-
You can steal my money-
But you better stay the -ell away from my 555's

John