> Which servos were used? Look at the loads, 1 kg at 10 mm that's .4 inch arm > with a 2.2 pound load hanging off the end, limited to 1 amp current. I > guarantee I could let the smoke out of a bunch of servos like that.
Unless my math is wrong (no coffee yet, so a real possibility) 2.2 pounds (1 kg) = 35.2 ounces. At a 0.4 inch arm (10 mm) this gives a torque of: 0.4 inches x 35.2 ounces = 14.08 inch-ounces Doesn't sound like a huge load to me. If I was smoking servos at that load I would be very concerned. This is only 33% to maybe 25% of the rated torque of most of our glider type servos. As far as the amperage, again, the 1 amp load is reasonable. I have calculated that on my Artemis (6 multiplex digitals - 4 FL's and 2 Micro BB) I have an average flight current draw of 7 mA/min. This is a current load of approximately 420 mA. On my large scale aerobatic planes (8 JR 8411 servos) I get a load of more like 1.5 amps during flight (25 mA/min average draw). Having said that, I would still very much like to see all the test data and conditions. Without that you cannot really determine if the test results are meaningful to your situation. In my experience I have only had 2 servos fail outright, 2 FMA super micros, and they went right out of the box. I had a Hitec 225 MG die after 5 years of hard use and I have lost 2 Graupner 3241 servos (my fault - turns out the Graupner servos dislike 6 volts while the JR equivalent digital is just fine with it). To me the most important factors are centering, holding torque, and speed. In that order. Life issues are not a concern since I do not think I have ever really gotten more than the one Hitec to go to EOL in real life use. And 5 years is pretty good. I should have changed it out before that. ~~~~~~~~~~~~~~~ Bill Malvey RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
