lml@lancaironline.net Mailing List Archive

I havent bothered to check indicated airspeed or my altimeter in my 360. My static ports are flush. They look like someone drilled a .010" hole through the paint/clear coat.

Before you all added elevation to your static ports did you bother to check the altimeter? At 1000' MSL on a standard day, a .02" error in your static line would give a 20' baro altitude error AND a 1.5 KIAS error (at about 150 KIAS), IF your pitot line was measuring total pressure correctly. An indicated airspeed error could be more than just your static port ...

A low pass at tower level to +/- 20' might be more accurate than trying to fly multiple legs of a course and measuring your KIAS to +/- 1.5 kts

On Tue, Jan 22, 2013 at 12:25 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

--
For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html