Cheap
Plastic clear protractor (Make white cardstock background)
My Control Surface Meter
Being a do-it-yourselfer, I "borrowed" this idea from someone - don't/can't remember who, modified it to suit....build yours!!!
Parts Needed:
Cheap
Plastic clear protractor (Make white cardstock background)
Long
straight pin. Small brass tube to hold pin.
3
- 4" piece of scrap pushrod cutoffs (leftovers after cutting 2-56 rods are
fine), small lead weight, extra nut, whatever for counterweight.
Dubro
or equiv. Landing gear strap, This becomes pointer pivot.
Hays
#104 Mini-Clamp (Tower Hobbies, p.282) Since they come two to a pack, I made a
left and a right, so I could set up both elevators or ailerons in one operation.
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The pivot is made by gluing a thin ply plate over the center
of the protractor. Drill. Glue in small cutoff piece of old #2 allen
wrench.
Drill Landing gear strap for small brass tube piece, which pivots on allen wrench. Solder the needle shaft, counterweight wire to the landing gear strap. |
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To use, clamp on control surface. Radio on. Servo centered. Hold clamp, adjust protractor till pointer rests on 90. Move sticks. You'll be able to observe VERY small differences in centering or travel, depending on how well you fabricate the pivot and counterweight. |
At one end, drill protractor for clearance of screw to attach Hays clamp. Adjust screw to tension needed to hold protractor, but still allow adjustment for zeroing. |
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