Instructions for use

19. Determining the center of gravity

In order to achieve stable ight characteristics, your FunJet ULTRA,

just like any other aircraft, must be in equilibrium at a certain position.

Assemble your model, making sure it is ready to y, and insert the drive

battery.

There are half-spherical markings on the underside of the wing.

Using your ngers as support, pivot the model horizontally. Corrections

can be carried out by moving the drive battery. If the right position has

been found, mark the battery box accordingly to ensure the battery is

always in the same position.

Fig. 18

20. Fine tuning

The excellent ight characteristics of the model can be optimized by ne

tuning the center of gravity and down thrust. The motor mount is also

useful here, as the down thrust can be adjusted and the adjustment result

can be read off a scale.

First y "full throttle" and trim the model exactly. If you then turn off the

motor, a steady descent must take place. If the model becomes slow, the

down thrust is too strong - reduce the down thrust. If the model continues

to "shoot", the down thrust is too low - add a little down thrust and trim

"up" before the next start. Repeat this procedure until the model makes

a perfect descent after reducing the throttle and goes straight ahead

spontaneously, if necessary climbing slightly, when "accelerating again".

When adjusting the center of gravity, y straight ahead at full throttle, ip

the model over. If the center of gravity is correct, you have to press about

15-20%. If you need to press less, the center of gravity is too far back - if

you need to press more, too far forward. In almost all cases, the center of

gravity has to be corrected by shifting the battery. If it is not enough, some

trim weight may also be necessary. After ne tuning the center of gravity,

you may have to repeat the down thrust adjustment.

21. Something for the visual appeal

The kit includes multi-colored decal sheets 2 A, B, C, D.

Position the individual elements according to our template.

22. Initial flight

Carry out a range test and make sure all the rudders are running in the

correct direction and are in the neutral position.

The model is started at ‘half speed’ from your hand - always against the

wind.

If necessary, have an experienced launcher start the model.

The model is started at 1/2 or 3/4 speed diagonally upwards (20-30°).

Assembly instructions