Arrow Twin

based on Flite Test Flying Arrow. The rest of the parts will need to be downloaded from them.

Unique parts:
9g & 17g servo holders - I burned up the 5 g servos.
Engine mount without tilt - print 2
Wire guides - spaced a little farther apart.
Twin Tails - you could use FT tail and glue rudders to it. This gives me a pleasing slight angle to them - may make it fly worse.

Basically, build two FTA arrows and insert a center section between the wings.

Differential motors can eliminate rudders. I was planning on two servos on each arrow shaft. Inside ones will control the elevator and rudder (optional). Hope the two outside will control ailerons.

All holes are sized for my printer and arrows. Yours may vary.