ChangeSun 90mm motor fan unit

Motor fan unit using outrunner 1900kv. Running at 6s with amp drawn 70A, the thrust is over 2.6kg. Almost 1.6g/W in benchtesting. My F18 now make a speed record of 180 km/hr.

Quadtwirl gyrotor revived !

My old quadtwirl is revived after its maiden 2 years ago. The torsional weakness is now solve with a piece of 1cmx 1cm balsa running along the fuselage.

Motor now upgraded from 100W to 250W outrunner that runs at 3s/ 20A with a 11x4.7 propeller. THe elevator will be mixed as Delta to provide more roll control. If I were to strengten the rotor, I would insert CF rod + tapes need the rotor blade root.

Converting 220V Hot glue gun to 12V

The heating element : Nicrome wire pressed to the contact slab (solder will melt ! ), the heating resistor 3.6K @220V, which generate rather constant temperature, and the insulating wrap.

These will be replaced by a 2-5W 8 Ohm resistor powered by 2-3s lipo.

SAPAC F16 with 70mm EDF

Now redo the power system with 70mm EDF at 700W. EDF unit from OK Model Tahmazo 3600kv inrunner. Speed now getting close to satisfaction. Needs to reduce the exit nozzle to get extra speed.