I think my 555 count is now up to around 23. I use them exclusively for my pylon aircraft (currently a total of 11), one Spad combat ship and few other sport airplanes. They are full ranged and perform very well in the racers at speeds to 165 mph and extreme vibration environment of rpm's up to 22,000. All this with antennas that are coiled on a fourteen inch soda straw.

Steal my money, run off with my wife but stay the hell away from my 555's

John