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LOL!!! Prop off!!?? That's thinking out of the box!! Quoting Jason J Ellingson <[EMAIL PROTECTED]>: > ----[Please read http://ercoupers.com/disclaimer.htm before following any > advice in this forum.]---- > > > <humor mode = "ON"> > > Take the prop off. Then you can leave it running while using the tow bar to > move it around. > > <humor mode = "OFF"> > > On a serious note... I wonder how many airports repaint their compass rose > to keep with magnetic drift? A local airport here has one, but it hasn't > been repainted for a long time... Yet the runways have been renumbered due > to magnetic drift. > ------------------------------------------------------------ > Jason J Ellingson > NC2273H > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Sent: Wednesday, December 28, 2005 5:17 PM > To: [email protected] > Subject: [COUPERS-TECH] Deviation chart - engine on or off? > > ----[Please read http://ercoupers.com/disclaimer.htm before following any > advice in this forum.]---- > > > Okay, on to esoteric technical problems... > > I found an airport with a compass rose and proceeded to align my airplane > over the rose, to get data to make a compass deviation card. > > Found it hard to assure good alignment with the rose, with the plane's > engine on and myself inside the plane. > > It would be more precise to have the plane off and to position it over the > compass rose by handling it from the outside. I could have the radios on > while doing this, however, I think that I would be missing significant > mangnetic fields from all those moving metallic parts in the motor, the > firing magnetos and spark plugs, and the turning generator, which's not that > far from the compass. > > IMHO you need the engine on in order to take every magnetic field into > account while gathering data for your compass deviation card. > > Am I right? > > Of course, I could position the plane while turned off, then start it and > take the reading, turn it off, reposition it, take another reading, and go > on... > However, I don't think turning the plane's engine on and off 12 times in a > short span of time is healthy for the engine, and worth it. > > So I either have the plane off and miss all those magnetic fields, or have > it on and miss accuracy in positioning it over the compass rose. > > So which one is it? How is it done in real life?? > > Eliacim Cortes > N87071 > > ============================================================================ > == > To leave this forum go to: http://ercoupers.com/lists.htm Search the > archives on http://escribe.com/aviation/coupers-tech/ > > > > > ============================================================================== > To leave this forum go to: http://ercoupers.com/lists.htm > Search the archives on http://escribe.com/aviation/coupers-tech/ > > > > ============================================================================== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
