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Originally Posted by ACE-OF-ACES
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I think you and others will find it very handy when doing top speed per altitude tests.. In that I put ~10 miles worth of 'FLASHING RING' at each of the test altitudes, which in turn makes it a lot easier to maintain the altitude, in that you get a 'visual' feedback and basically all you have to do is fly through the FLASHING RINGS
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What kind of defviation do you get flying through the rings? I try to stay within 10-20 feet of altitude.
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Quote:
Originally Posted by klem
EDIT: btw Z_AltitudeMSL is true altitude above SL but is not representative of the Density altitude,
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Yup! That is why I use it over the others! 
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But that means you can't compare it with historical data because Z_Altitude_MSL is the 'tape measure' altitude not the Standard Day or "meteorological" altitude.
EDIT: AoA, I wonder if the rough running is an on-line problem only? Would be interested to hear how you get on if you retry the SpitMkIa/100oct offlinre at altitude.