F E I B A O L - 3 9 A L B A T R O S
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Congratulations, you have completed construction on your Fei Bao L-39.
See the Pilots Notes for balance and control throws.
Technical data:
Center Of Gravity:
Balance your plane in the middle of the main spar, with the UAT full and the main tank
empty and the gear retracted. You can move the CG forward or aft for later flights, but
this is a nice safe position. Be cautious about playing it too safe and going too far
forward, you don't need to. Avoid adding lead if possible, move equipment forward if
you can. There is a slight trim change aft as the fuel burns off, but it is not significant.
The plane should lift off by itself on takeoff, even though it may have a slightly negative
angle of attack due to the nosegear strut compressing.
Engine Selection:
The L-39 was designed for engines from 12-18 pounds of thrust. It will fly fine, in a
very scale-like manner, with only 12 pounds of thrust. 14 will give a little more push,
and a P-70 or Wren Supersport in the 16-18 pound class should give very vivid
performance. Be aware that while you can indeed use larger 66mm engines like the
P-80, they do add more weight, and you might not be able to realize their full thrust
potential using the stock FeiBao tailpipe. There is certainly room for a larger diameter
pipe if you feel the need.
Control Throws:
Ailerons: Due to their gapless sealed construction, they may be more powerful than
you expect, so do not overdo the throws. First flight should be 15mm up and down.
You can adjust this later if you want more.
Rudder: 25mm left and right
NosegearL No more than 10mm left and right. You can set up dual rates to have
higher rates for taxying if need be.
Elevator: 15mm up and down
Flap: 35mm, measured at the trailing edge at the root. You will need at least 2mm of
down elevator trim with full flap to keep the nose from rising. Half flap requires no trim.
Summary of Contents for L-39
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