thanks adrian, i'm also learning form others, will post some pic and video soon
as the video with my friend...

the small one fly like real airliner slow and steady... look real

for my small A318, i use only 800mAh 3S1P battery, actually this plane can use the 1000mAh, and for the big A318, i will use 2600mah 3S2P( 1300mAh 3S1P X2) and for your F15, better use big capacity, at least 2200mAh . but the battery will get hot as the stock motor consume of 22amp per motor, that mean is about 44amp...
P/S: yes, both ducted fan drink bottle is 100plus
