FlyingMonkey Posted August 9, 2013 Report Share Posted August 9, 2013 Hey all... My airplane has a "steam" tachometer, no fancy-fied engine glass. This makes mag checks a bit more art than science. My current technique is at 4000rpm to watch for a *slight* drop in RPM on each mag, and that they are roughly equal. I also listen to hear the faint one-mag roughness even out when I go back on both mags. Given the large scale graduations on the tach, there is not really a good way to distinguish between a 100rpm drop and a 150rpm drop. They would both just look like a "blip" on the tach which only has 200rpm resolution, and those lines are quite close together. Is there a more scientific way to ensure proper RPM changes with a steam tach? I seem to remember doing mag checks on the Tecnam I flew several years ago with the same style tach in the same way, as taught by Lockwood Aviation. Link to comment Share on other sites More sharing options...
C ICEY Posted August 9, 2013 Report Share Posted August 9, 2013 it's a sound that when it fails to operate as normal, I think you would recognize it as unusual. JMHO, from memories of sound that are still fresh in my mind! Link to comment Share on other sites More sharing options...
sandpiper Posted August 9, 2013 Report Share Posted August 9, 2013 Andy - don't over think the issue. You'll know the first time you have a problem. Link to comment Share on other sites More sharing options...
Ed Cesnalis Posted August 9, 2013 Report Share Posted August 9, 2013 Doing mag checks with steam gauge tach is nothing new. It works fine. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted August 9, 2013 Author Report Share Posted August 9, 2013 Yeah, I'm fine with how I've been doing it, but thought somebody might have a tip or trick to it and getting a little more information from the process. Link to comment Share on other sites More sharing options...
CT4ME Posted August 9, 2013 Report Share Posted August 9, 2013 I'm with you on the 4K... 'let's you see a bit more drop. I have same setup, with not much visible drop. tim Link to comment Share on other sites More sharing options...
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