Multiplex Twin-Jet

N° of launches / Time	6	0 hour 33 mins	Not all flights shown
Wingspan	35.8 "	0.910 m
Wing Area	395 ¨"	25.5 dm²
Flying Weight	2 lb. 14½ oz	1.315 kg
Wing Loading	16.9 oz / ¨'	51.6 g/dm²
Wing Cube Loading	10.2 - Just above the Aerobatic group
Motor	2 x Graupner 480 BB Race 7.2V, wired in series
Propeller	2 x Graupner Super 6" x 4" (Grey) reduced to 5" diameter
Batteries	12 Panasonic 4/5 Sub-C NiMH
Speed Controller	Schulze slim-25be - 6 to 12 cells - 25A continuous - BEC & Brake
Receiver	Webra Nano S6 - 6ch - PPM - 35 MHz
Servos	Elevons - 2 x Hitec Hs-81MG
Static motor parameters	17000 RPM @ 20.0A, 12.7V, estimated 88W/lb.
Flight performance	Flies quite fast and climb is good, but I still need to do some experimenting with propellers.

21 Jun 01 - I bought this model at the Sandown Model Show on 2 Jun 01 along with the Mulitplex Cargo, and I completed this model yesterday. Construction is the durable Elapor foam (EPP) as per the Pico-Jet Combat. The model is supplied with 2 Mulitplex Permax 400 6v motors and standard Günther propellers. I want to upgrade the performance without significantly increasing the weight so 480 motors were to be used. I couldn't get standard 480s so took a pair of Graupner 480 BB Race 7.2v motors instead. These motors turned out to be a far hotter wind than I thought and I couldn't run them in parallel on 8 cells. I therefore decided to increase to 12 smaller cells with the motors in series. The Panasonic 2000 NiMH 4/5 Sub-C cells are considered good up to 30A and a 10 cell pack is almost identical in size to an 8 cell Sub-C pack. To make it different in appearance I have painted the aircraft white, with black panels for the cockpit glazing.

The first launch attempt ended abruptly when my hand when through the right hand propeller on the follow through. This broke the propeller in two and dislodged the motor. The out of balance propeller pulled the motor loose and the model cartwheeled into the ground. The only damage sustained to the model was a slightly crushed nose, the broken propeller and both motors knocked loose. I ended up with a nasty gash in my left index finger which will take much longer to heal than the model will to repair.