As my Coupe is finally ready to take to the air again, I have a decision to make relative to vacuum-driven gyros. After getting my panel put back together after the fuselage tank repair and subsequent problems with the airspeed indicator, I am left with the knowledge that my marginal and inoperative gyro instruments owed their lack of functionality to the fact that they were not connected properly to the vacuum source (or in one case not connect to any vacuum source other than the sound of my deflating wallet). My A&P is confident that he can restore the gyros to their original utility, however he is somewhat lacking in Ercoupe-branded documentation for that purpose. Using the plumbing schematic from a Cessna 172, he can make a reasonable guess in how to hook them up. However, he would be happier if I could find documentation that we can be sure will work with the Ercoupe.
I have one large venturi and two vacuum-driven instruments: a directional gyro, and an attitude gyro. There is a vacuum regulator which may not be of value if I am going to need all the vacuum that the single venturi can produce. There is also a vacuum gauge that has never indicated any vacuum since it is not connected to the system at all. My decision to scrap the entire vacuum system and vacuum-driven gyros is partly depended on whether or not I can get them working given reasonable expense, effort and aggravation. This is my question: Where can I find a schematic or other documentation on how to do the vacuum line plumbing for these instruments? As always, thank you all for the time that you devote to helping others in this forum. p.s. I will start writing my report on the rudder pedal installation this weekend. I hope to have it posted here in a couple of weeks. Frank Nelson N51DV 415C (finally out of annual) TOA/California
