The Astro Flight servo tester looks promising, I was hoping it would tell if it had the 555 timer circuit. I currently use a servo driver that was made by CUSTOM ELECTRONICS which is now of business. But bottom line there is a 555 timer circuit, throttle stick and a battery to power the servo driver circuit. The turn dial is nothing more than a 5K ohm pot I think that works with the 555 timer circuit. I use an external battery for my servo driver so that only the signal and ground are sent down the lines.

If you do a google search under SERVO DRIVER you might find this on how to make your own. I need to try this myself since my servo driver is getting old and will need some help.

http://web2.murraystate.edu/andy.bat...mpledriver.htm

Also to answer your question about the pratical size of a CL scale model the larger they get more they pull. I have flown the 1/4 scale Morrisey Bravo from the sig kit with a Saito 90 four stroke, 87" span and 19 lbs. The adjustable leadout guide is a must with these size models. The maximum engine size is 1.35 cubic inches, but you probably will never need an engine that big. I like to fly models that weigh between 8 and 15 lbs, 60" to 70" span, .60 or .90 size engine for CL scale. The adjustable leadout guide is a must to keep the line tension within reason.

As for insulated lines, electrical shorts will shut the system down so to be sure I always fly with two insulated lines. I did fly a Tomahawk stunt model with electronics in the mid 90's and it was able to limited aerobatics with the insulated lines but the line drag was excessive. Windy Urtnowski of the New Jersey area has also experimented with the throttle control and sells the Infrared system if you don't want to send the signal down the lines.


Good luck