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Kurt Haller RV-9A
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Date:  11-25-2018
Number of Hours:  1.50
Manual Reference:  
Brief Description:  Flap reticule

On outboard end of left flap, marked lines on flap skin with a combo square set on wing skin trailing edge when flap extended 10 and 20 deg. The "reticule" layout sketched on the white board in image 1, when placed with respect to the flap l.e. skin edge as shown (see also image 2), allows the pilot (if he or she is my exact same size!) to see when the flaps are extended 10 or 20 degrees. (Full down flaps have 32 deg extension.)

With 10 degree flaps, the forward edge of the first square of the primary reticule aligns with the t.e. of the wing skin, from the left-seat pilot's perspective (if, again, they are my size). The tops of the triangles also aligns with the wing skin edge. (Cf. image 2.)

With 20 degree flaps, the aft edge of the third square aligns with the wing skin edge, as do the middles of the diamonds. (Cf. image 2 again.)

Flap extension (on the ground, no air loads) takes about 8.5 seconds from full up to full down. It's about 3 seconds to 10 deg flaps, and another 3 to 20 deg flaps, then 2.5 seconds to full flaps (which don't have to counted, since the motor freewheels at full extension). Unless I find counting Missisippis (with a glance at the reticule to verify) too inconsistent for good landings, that will be the flap extensions system. No encoders or fancy electronics needed.

Image 3 is a ghostly selfie to show the DAR I really really did build this thing.
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Flap reticule layout

Flap reticule layout

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Left flap reticule w/helper marks

Left flap reticule w/helper marks

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Selfie in Alclad

Selfie in Alclad

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