no I am not saying that all I said was that starting in 1972 flight packs were designed to continue to operate while you were still in the air if one cell went bad,back in those days it was not an uncommon problem.it gave you a chance to land and hopefully you would catch the reduced voltage in the pack before the next flight.no where did I say it was ok to go and fly with a 3 cell pack.someone asked if rx would work on 3.6 volts.I supplied a link to where they were discussing rx operating voltages and the specs of two rx showing what the lowest operating voltage is.for the longest time I used to use an old kraft kps-12 4 wire servo on the throttle.when a cel did go bad the other servos woild still operate but the throtle would not.batteries now are made better than they were 30+ years ago and you may never have a cell go bad but there are alot of old timers that it has happened to.now don't you think if they designed that feature into servo's and rx back then that it would be a standard that should have continued?I will post the old kraft and e-k ads from that time period if I can find them.E-K logictrol was the first to have the 3 wire technology,all other manufactures followed suit.1972 was the first year kraft had 3 wire servos avaiable.that was one reason for buying a 6 channel series 72 for a vk cherokee.