SAPAC F16 II 首航

SAPAC 64mm 6 blade (GWSclone?) EDf
Stock outrunner , kv unknown
Power testing. 3s 2200mAh 26A, thrust ~650g
4s 2200mAH, 34A, thrust ~ ???
3s 2200mAh RTF weight ~720g, with landing gear

Very stable flight. Very fast even with 64mm EDF. Can drop in 70mm EDF without any modification.
This plane has CG issue. With stock 64mm EDF, 2200mAH 3s is nose heavy and the lipo has to be slide all the way into the fuselage. 4s 2200mAh is definitely out.
I end up by moving the EDF all the way to the back , so that I can use either 3s or 4s 2200mAh.
This plane 's airfoil is very thin, yet it stalls pnly at a very low speed.
The servo horns needs to point inwards, or else the push rod will hit by the horizontal tail.
I use the farthest servo horn hole (and innermost tail control horn hole) to have adequate ail/elev response.
The landing servo is a bit difficult to install because of the limited space inside the cockpit.
The long pushrod needs some strengthening....

Remember the tail fin needs to trim down a lot for straight level flight.