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Dan, Heres the meaning of the colors from this website: The color coding of the airspeed indicator has meaning. The color arcs are as follows. http://home.swipnet.se/~w-65189/AP_html/pitot_static.htm (good reference source) White Arc - Stall Speeds and Flap operating Range ----- -- Lower end of arc is the Power Off Stall speed with flaps and landing gear in the landing position. ----- -- Upper end of arc is the maximum flaps extend speed. Green Arc - Normal operating airspeed range ------- Lower end of arc is the power off stall speed clean (flaps and gear up) ------- Upper end of arc is maximum structural cruise speed. (Max normal operating speed). Yellow Arc - Caution range. Avoid this area unless in smooth air. Red Line - Never exceed speed. -------This is the maximum speed at which the aircraft can operate safely. ------- It should never be intentionally exceeded. V Speeds The Pilot Operating Handbook normally lists various airspeeds for differing situations and conditions. The definition of the usual V speeds is shown below. is an abbreviation for Velocity. VA VFE VLE VLO VNE VNO VR VS0 VS1 VX VY Design maneuvering speed Maximum flap extend speed Maximum landing gear extend speed Maximum landing gear operating speed Never exceed speed Maximum structural cruising speed Rotation speed The power-off stalling speed or minimum flight speed in landing configuration The power-off stalling speed (clean) with flaps and landing gear retracted Best angle of climb speed Best rate of climb speed/Best Glide Speed So, white arc doesnt apply to Coupes since we have no flaps. Green arc lower end is the slowest airspeed you can measure minimum flying speed. You can go up and flight-test for this number. It ought to be in the ballpark of 50 mph for a 415-C. (Note that if its showing much faster airspeed at your minimum flying speed, you should do careful testing of your airspeed indicator they often get way off when they age.) The green arc ends and the yellow arc begins at maneuvering speed which is, as I remember, 108 mph. Check this number in your aircrafts owners manual. The top of the yellow arc and the redline are 144 mph. Ed Burkhead http://edburkhead.com/ ed -at- edburkheadQQQ.com (change -at- and remove the QQQ) -----Original Message----- From: Dan Dunn [mailto:[EMAIL PROTECTED] Sent: Tuesday, December 21, 2004 2:25 PM To: Ed Burkhead Subject: Air Speed V Speeds Good day Ed; Your knowledge of such stuff leaves me to ask the following: My newly acquired 415 C (85hp) has an airspeed indicator from where I don't know. The V speed markings are a mess and I MUST get them changed straight away.
