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This was my exact experience with my RV-6….not sure why from an engineering standpoint that it's argued when there is ready available data such as yours as to the effects of flush mounted static ports. On Jan 22, 2013, at 9:55 PM, Dennis Johnson <pinetownd@volcano.net> wrote:
I have a Legacy RG and put my static ports flush with the outer skin, located in accordance with the assembly manual. During my flight test phase, I pleasantly noticed that I always had a tailwind! I knew I was lucky to be flying such a wonderful airplane and just figured I was equally lucky to always have a tailwind.
Eventually, logic prevailed and I realized nobody could be that lucky. I flew the four course GPS airspeed check and discovered that my indicated airspeed was reading low. I added a tiny piece of machined aluminum, similar to a domed head rivet, to both static ports and it solved the problem. Other Legacy builders who installed their static ports protruding slightly tell me that their indicated airspeed is accurate.
Dennis
Legacy 580 hours --
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