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Old 01-30-2019, 06:14 PM
Scott Hersha Scott Hersha is offline
Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 1,085

Iím just curious about why. It seems like any drag reduction for finishing off the flap, aileron, etc ends would end up maybe increasing drag. The only air blowing through those gaps during straight and level cruise, would be the air that is leaking from the high pressure area below the wing/control surface, to the low pressure area above (or below in the case of the HS/elevator counter weight area). Wouldnít you want to limit that leakage by leaving the ends open thereby increasing drag in that small area? Iím probably wrong about this, but it seems like you would be dumping generated lift and thereby increasing drag by requiring a corresponding increase in AOA and induced drag to make up for this lift leakage. Granted, the difference would be minuscule, but so would any perceived aerodynamic drag reduction from finishing an open rib end (absent any loss of lift). Maybe I donít understand the aerodynamic airflow at the trailing edge of a wing, but Iím curious if youíll see a difference using this technique, and what that will be.

It looks nice though, and if thatís the goal, I think you did a nice job of it.
RV6/2001 built/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
RV8/2018 built/Flying
Cincinnati, OH/KHAO
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Old 01-30-2019, 06:21 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,028
Default Closing end ribs

Iíve done this on all three RV projects. It is solely cosmetic.

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Old 01-30-2019, 06:29 PM
Bill Boyd's Avatar
Bill Boyd Bill Boyd is offline
Join Date: Sep 2006
Location: Landing field "12VA"
Posts: 1,343

Not worth it for mere cosmetics, IMO.

In my mind (and only there, perhaps) this was an exercise in turbulence reduction and therefore drag reduction. There's going to be flow from bottom to top of the control surfaces anyway. Might as well let the flow cross a mating pair of smooth surfaces versus crossing the mouths of shallow buckets facing each other.
Bill Boyd

Hop-Along Aerodrome (12VA)
RV-6A - N30YD - flying since '98
RV-10 - N130YD reserved - under construction

donating monthly to the VAF - thanks, Doug
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