This is clearly diagrammed in AC 43.13. There needs to be Tee's to the static port, not vented to the cabin.
Kevin1 --- In [email protected], "Ed Burkhead" <[EMAIL PROTECTED]> wrote: > > Chris wrote: > > > Ed, I tend to agree, but on the two coupes I have looked at > > > the aluminum lines come in parallel and connect to airspeed > > > indicator only. There were no provisions or "Tees" to > > > connect the altimeter and VSI. > > > > Chris, > > > > In the special Coupe pitot/static tube under the wing there are two separate > systems, hence two tubes leading up into the wing and to the cockpit. [Extra > details for lurkers who haven't yet really looked at the Coupe system.] > > > > There should be two tubing-lines from that under-wing device into the > cockpit. There do need to be T connectors (or a distribution connector) on > the static line so the altimeter and VSI and encoder can share the static > source. If they're vented to the cockpit, they're not going to be as > accurate and they are supposed to be. > > > > (Well, the VSI might be fine vented to the cockpit since it only measures > rates of change. You'll get a burp when you open or close the window and > maybe start or stop a 3-control slip.) > > > > Query for experts: If there are three or four instruments connected to a > single static source, does that cause extra instrument lag time? > > > > We have seen, over the years, a bunch of Coupes with mis-connected static > systems. Obviously, the Coupe system is just too difficult for the IQ of > the some mechanics (though I'd assert that the majority get it right). ;-) > > > > Ed Burkhead > > http://edburkhead.com/Ercoupe/index.htm East Peoria, Illinois > > ed -at- edbur???khead.??com (remove the ? marks and change -at- > to @) >
