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Old 11-12-2017, 11:54 PM
DrillBit's Avatar
DrillBit DrillBit is online now
Join Date: Nov 2007
Location: Pleasanton, CA
Posts: 98
Default Trim F976 Center Bottom Skin "flaplets"?

Currently rigging flaps and haven't found anything in the builder's manual or a Google search of VAF about trimming (or not) the little rectangular "flaplets" of the Center Bottom Skin, F-976, extending aft out from under the rear spar attach bolt.

Starting with a flap hanging down free from its hinge points, I've successfully remembered to gently push the flaplet skin out of way when raising the flap to connect it with the actuation weldment. It seems the flaplet might underlap the flap on purpose as a gap covering. But when the flaps are lowered, their bottoms will bear on the flaplets' corners, chafing the flap and bending the flaplets by more than non-fatigue-inducing amounts.

Should these flaplets be trimmed so they don't interfere with flap motion, from fully up to when hanging free, unattached to the actuator? It sure would remove a gotcha, as I have more than a few iterations yet to go before the flaps are rigged to aileron neutral. On the other hand, if the flaplets weren't pushed by the slipstream against the flap bottoms in flight, would they buzz, flutter, and fatigue unto failure just as well?
Kurt Haller
P-town, CA (10 min from KLVK!)
N748PK, RV-9A
In final assembly...

VAF dues paid 1 Jan 2017
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Old 11-13-2017, 07:34 AM
MarkW's Avatar
MarkW MarkW is offline
Join Date: Sep 2011
Location: Lake Mary, FL. KSFB
Posts: 978

Hey Kurt,
Going by memory, these stay. They do rub but don't cause a problem.
RV9 - N14MW - Flying
G3X - ECI Titan I0-320
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