9
Change servo-arm holes for the drooperon if this pushrod is limiting the
elevon’s travel.
6. Use significant negative differential to get proportional up/down deflections
on the elevons.
Performing the Tumble
1. Gain some altitude, then enter a shallow dive, around 20° from horizontal.
2. Wait a couple of seconds to gain speed.
3. Pull the stick all the way back fairly quickly.
Ideally, the Zulu will pitch upwards past vertical after you pull the stick back, then
transition into rapid rotations. Recover by releasing the stick.
If the approach above doesn’t work, your servos may be too weak or your
elevon pushrods might be bending and limiting the deflection. If this is the case,
here’s an alternate approach:
1. Gain some altitude, then enter a moderate dive, around 30° from
horizontal.
2. Wait a couple of seconds to gain speed.
3. Gently pull back on the stick as you would to make a loop, but stop pulling
back just after the Zulu is traveling vertically.
4. Wait for the Zulu to enter a tail-slide, then quickly pull the stick back all the
way.
The 2
nd
approach takes some timing to get it to work, so don’t be disappointed if
it doesn’t happen on the first few tries.
