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How Did the Test Work for the New TruLite Wing Modification and Flight on the Plane?





Aviad made a significant update to TrueLite aircraft, optimizing it for the American market. Initially known as Zigolo MG21, the TrueLite was already designed to incorporate a larger wing design compared to its first prototype version. Although the initial version had shorter wings, this project proved effective under various conditions, solidifying its reputation for quality. The enthusiasm and attention garnered after its launch led to the continuation of work on adapting the aircraft to a broader market. It was therefore decided to complete the initial project with a long wing and add a sophisticated flap to enter the American FAR 103 market, positioning the TrueLite among the most exceptional ultralights in its category.


short wing TrueLite
short wing TrueLite

Long wing TrueLite
Long wing TrueLite


One of the main challenges faced, given the addition of the flap, was to maintain the rapid folding system of the wings without increasing operation times; thus, the folding system has not undergone alterations and remains as quick as before for its folding and transport. We redesigned the wing with the addition of the flap, a fully aluminium coating, and complied with the regulations with an empty weight without parachute of 114kg.


TrueLite with long flap extended.
TrueLite with long flap extended.

TrueLite on his Trailer folded with Flap and propeller.
TrueLite on his Trailer folded with Flap and propeller.



The addition of the flap expands the speed range, and combines the famous Zigolo MG12 with Zigolo MG21 as you have seen so far, into an exceptional TrueLite, with predictable stall behavior, ideal for low altitude flights, and ease of use in Aviad style.



TrueLite wing tip and flap extended.
TrueLite wing tip and flap extended.

air to air TrueLite


Important details such as deciding to keep a (Va) manoeuvring speed, above the aircraft's possibilities, and the same for the Vf, maximum speed for flap extension, which were chosen to meet certification requirements, make this TrueLite an airplane where fun and simplicity come first.

These speeds have been set well above what is necessary, to allow for the safe opening of the flaps and the maintenance of cruising speed under all conditions, greatly simplifying flying and eliminating any complications from piloting.






With the shorter wing configuration, a fuel consumption of 8.5 liters per hour was reported, but in the new configuration, it is possible to maintain reduced cruising speeds. By adjusting the engine to 5800-6000 rpm, speeds of 75-80 km/h can be reached with an estimated fuel consumption of 5 liters per hour, according to the engine chart. These data are truly excellent in this category. Remember that we can use the engine under its cruise regime or bring it to 75%, reaching significant speeds between 95 and 100 km/h in cruise.


Landing is now one of the strong points that has improved at low speeds and, thanks to the type of flap adopted, the slotted flaps, we have always predictable control of the aircraft at very low speeds and exceptionally short landings.




On takeoff, the acceleration is impressive, and the total adjustment of the airplane allows for full throttle with the bar pulled to the belly without having to worry about anything. The thrust of the engine and the lift from the tailplane have a perfect balance, where dangerous attitudes are avoided that could be adopted by some inexperienced pilot who wants to take off too soon.




The manoeuvrability at low speed with this wing size is now a bit softer and less reactive, but at a speed of 75 km/h it becomes reactive again, to then have perfect behaviour in cruise.


here some of video during test




Other minor modifications have been made, such as the removal of the steel cable in the tail and the incorporation of a fully aluminium covering on the wings. For the flaps, an electric actuator is used capable of moving the entire system in 5 seconds; the control we have developed is an electronic switch with 4 positions that sets the flap according to the angle calibrated on the card. For the ailerons, brackets have been added, the differential angle of the ailerons increased, and the effect of the Bowden significantly improved, which is now comparable to a command with pulleys.






So, personal opinions: it's funny, easy, absolutely versatile, ideal for tourism or playing at flying low slowly, It's beautiful, safe and different from the rest!




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