Indestructible 3D trainer - TechOne 10mm EPP Yak55
Days of cf reinforced EPP or depron is no more. :)
10mm epp and 33inch makes perfect combination of rigidity from foam and flexibility all in one.
TechOne 33inch Yak55 came with a wooden spar. That is the only thing I changed from wood to carbon as I did not want to repair the broken spar.
I expected flimsy and flexible as there are no cf reinforcements. But, this bird was surprisingly rigid during flying and flexible during crashes.
If the motor mount holds up in crashes, only thing one has to think about is the servo arms and gears. :)
This is after couple of trim flights so don't expect too much.
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