Thunder Tiger 3D Park Flier

A light weight profile aerobatic electric model capable of extreme aerobatics

Click image for bigger photo

The kit is supplied with a 300 brushed motor and all the part including 5 min epoxy. To fly the model you also need 3 micro servos, speed controller, batteries and receiver. The model is made of paper covered white foam strengthened with carbon rod where needed. There is no building, it slots together. I chose to use a brushless motor and made a small bracket to mount it. The servos are stuck in with silicone, the speed controller and receiver  stuck on with double sided tape, the battery pack is held on with Velcro on the C of E. About an hour should be enough,. put the batteries on charge before you start

Eflight 370 12 pole brushless motor, plenty of torque from a very light motor,. fitted with a crude home  made bracket. static current draw with a 9 X 3.8 prop is 9 amps full throttle. This motor remains cool even after periods of prop hanging.

3 cell 11 volt 1350ma  lithium polymer battery 80 grams and capable of 17 amps. about 20 minutes flight time. This battery pack also remains cool even after heavy use or charging.  

 slow pass for the camera, tail dragging

 prop hanging, power to spare from the little brushless motor


Suit you sir? Yes, if you can fly a Zagi without thumping it into the ground, you can fly this, but with so much power and fast response it is not a trainer. It could be flown in the park or in your back garden,  skilled pilots prop hang them indoors. With the brushless motor it is best flown where there is plenty of space to start with. Flights from balconies should be possible, just make sure the prop has stopped before catching it. .
The first proper flight I had was at our Barbeque at the Bristol Gliding club; all  control surfaces were set to  neutral, no mixers or rates used, set up as a basic 4 channel. 
Half throttle a limp throw and it climbed steadily but wanted to go left, 6 clicks of right aileron trim counteracted the prop reaction and had it flying straight. It was very easy to fly but I was rubbish with the throttle and rudder. I managed a couple of rolling circles, a flat rudder turn loops and bunts. I tried a spin, this resulted in a spiral dive due to a forward C of E 
 The 3D can perform any aerobatic maneuver; the wing is a flat sheet so it flies the same inverted. There is enough power to hover on part throttle, I find this very hard, there are two ways to learn this trick, low down so it does not have far to fall, or high enough to recover. Rolling hesitation circles, knife edge circles and loops, rolling loops should be easy with this model for the aerobatic pilot. Power flying needs coordination of the 4 stick movements something I need to learn. The 3D has a very large speed range from zero to about 40MPH, with the fan blowing over the surfaces there is no stall and full control,


wing span:-  32"
length:-  30"
all up weight 12 oz
radio Futaba 5 channel park flier
servos 3 Hi-tec HS 55s
motor E-flight 370 with controller
Battery  3 cell 1350 Li_Poly
Cost with brushed motor 34
Li_poly battery 12 to 35
Brushlees motor and controller 60

I like it, Great fun, the Ikarus flies better but is very fragile and more building is required. Learning to fly a 3D model is a challenge.
There is a design fault, the battery is below the wing giving too much pitch and roll stability, useful for the first flights but would spoil acrobatics for the expert. 


Please note, Li-poly batteries need a foolproof dedicated charger, a multi charger is not safe, the cells need individual monitoring and must not go over 4.235 volts.
They also need a battery cut off in the speed controller to stop the motor before the cells discharge below 3 volts. The speed controller I used needs a fully charged battery to set low voltage cut-out, reconnecting a partly discharged battery would disable this function
The Battery should not be over stressed, discharge well below the maximum rating and charge at 0.5 C to 0.7C  they are charged when the current drops to 0.1C at 4.2 volts. watch this video of an overcharged battery click here