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 @)
