Plumbing and Static Sources

On Tuesday, December 9, 2014 6:07:23 PM UTC-5, Six-Seven Romeo wrote:
I looked in the RAS archives for an article that delved into my question below. No dice. So here goes.

Consider for a moment two gliders and the multiple static pressure sources found within (tee'd left/right);

Ventus CM (Motor Glider)
1) Under the wings
2) On the sides of the boom about 6 ft from the tail
3) Prandtl probe in the vertical stabilizer

DG-100/200/300
1) About at mid-calf area
2) About at hip area

Between the two ships there are more static sources that you can shake a stick at from nearly the nose to nearly the tail.

So which static source should be used? Should particular static sources be sent to specific instruments? Should some static loving instruments be kept isolated? Can some mechanical instruments that use different air pressure sources (i.e. ASI with pitot and static) cause bad mojo with other instruments that also use static? Help!

Inquiring minds want to know. If you are going to tell me to start drilling holes for an alternative "perfect" static source location, please take up knitting.

Thanks

Very simple- use the ones the manufacturer specifies for the airspeed indicator because all the limits on the glider are based upon those.
Altimeters don't care about static accuracy so any factory static should do fine.
Static ref for varios, when needed are probably best on aft fuselage statics if available, from my experience.
FWIW
UH

Aft fuselage statics work well but can be more susceptible to clogging when dumping water ballast in certain gliders with lower-surface-of-wing outlets (e.g., my old LS 3, in which owners installed a switch to pump pitot pressure through the lines to keep them clear). Probes are vulnerable to ground handling damage and in-flight spearing of geese. Your call as to which is more likely.

Chip Bearden
ASW 24 "JB"
U.S.A.