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Finally!!! Weather in Lithuania become better, hot sun and no wind, its so nice to finally enjoy some outdoor flying. Today me and Vitalijus went to airfield to test new planes, well actually only Vitalijus made real test flight for his new F3A plane Aresti 3 with OS-140, i only test new engine on my good old Showtime. YS140 was simply to heavy and little to expensive to fly (one flight fuel was ~ 3 eur). Good four stroke engines really are pleasure to fly allot of power quick respond on throttle stick movement and great sound, but YS140 and 90 size plane is not good combination. I had to put rudder servo in tail on pull-push to get right balance... So i decide to change YS with new two stroke OS 120AX. Its perfect size for Showtime, besides two stroke fuel will cost less $, it can run with low ~5-10% nitro and still have great power for 3D flying. With lighter engine i can pull out rudder servo from tail and put it on Pull Pull in midle of center, also i sold my Hitec servos and replace them with Airtronic 94751, this save me ~80
(rudder HS 5955 ~60g, each Airtronic servo is 10g lighter than old HS with metal gear. Already in first day of flying i can say this make different, plane fly lighter and is more predictable, it don't wan't to fall to spin so badly. Naturaly OS 120 on 5% nitro and 22% oil ( for brake in) can't have same power as YS140 with 15% nitro, but i hope in future with 10% nitro and less oil it will have close performance like YS.
Today each of us made only 3 flights, and it was enough besides sun and RX battery get low, so no point to risk:) Will make more flights next week. Pictures:
New Aresti3 and Showtime.
Hangar 9 "Showtime 90".
New OS120AX what a engine it start all 3 times with first flip !!! OS120AX is really light and very powerful engine (3.5HP) ! Nice thing it is designed to fit 90 size engine case, so it won't take extra space in 90 size plane cowling. Weight with adapter and muffler is ~ 638g (~22oz). I use Xoar 17x6 prop, today i forgot to check RPM, i will do it next time, but i can say work of engine sure sounds great:) To get even and smooth engine work in vertycals i decide to instal Perry fuel pump . Probably best part of this engine is Pits type muffler, no negative effect when heavy muffler drag plane to sides in up and downlines because of its weight. Vitalijus with new F3A bird and Showtime, he was very happy with performance of his new plane. And it sure will be much more interesting in local and international F3A competitions to have one more strong pilot with good plane. Rolling harrier. Arresti 3 landing.
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