Randy, all. These days I would instead of rebuilding any vacuum instrument sve the money toward something modern: A electrical HG. http://pcflightsystems.com/EGYRO2.htm Reason is that a 9 inch ventury robs you probably of 5 miles speed when cruising. Also the ventury produces the advertised vacuum only at cruising speed, at lower speeds , while climbing for example it will be low , leading to unreliable readings. If you consider that the reasoning to have gyros in a VFR only plane is to function as a backup system for inadverted flight in low vis. And one usually will climb out of these conditions, I find the 9 inch ventury the least of my desired backup options. The electrical one like the one I linked to is the future in avionics. A glass cockpit for the small pocket. But this is actually all we need . Hartmut
To: [EMAIL PROTECTED]: [EMAIL PROTECTED]: Mon, 14 Jan 2008 21:30:08 -0600Subject: [ercoupe-tech] Venturies for Vacuum gauges I have a DG and an attitude indicator on the same venturi. It's the biggest Wag-Aero venturi that is supposed to run 3 instruments. In flight my vacuum gauge usually shows 2 1/2 to 4" of mercury. Sometimes, the attitude indicator will act strangely, rolling over or doing other odd things. The DG is always working fine. I'm trying to figure out what the problem might be.My venturi is mounted on the pilot side, just aft of the engine cowling, on the part of the fuselage that is angled as it widens for the cockpit. So the venturi is parallel to the fuselage, but not pointing straight ahead. Could this be a problem? Where do most people mount a venturi on an Ercoupe? This set up has been on my plane since I got it, and I'm not sure that it ever worked 100% all the time. Before I send my attitude indicator in for a re-build, I'd like to figure out what the problem might be.If any one can help, I'd appreciate it.Randy HoughamGrandpa's ErcoupeNC87384 _________________________________________________________________ Watch “Cause Effect,” a show about real people making a real difference. http://im.live.com/Messenger/IM/MTV/?source=text_watchcause
