The OK model L39 has a stock 70mm EDF , with thrust measured ~ 1kg at 48A x 4s (almost 700W) . Thrust to Watt ratio 1.4/W. Without lipo , my L39 with all the gears and lighting weight almost 1140g.
Pending for 555 timer to make them flash. Using PIC (program from rc-cam) for control of the flash is also anoter option.
X-flight electronic retract. Almost tailor made snap in for a 70mm EDF . The wing root is deep enough to install the electronic retract.