Incorrect airspeed values in Turbine Duke manual?
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Love this plane. Currently in Greenland on my way to Norway from Canada. The info below is from page 13 of the manual. The numbers seem way too high. I searched but didn't find any other posts about this. Agreed, or am I missing something? A minor fix for a future manual revision.
Aircraft Performance (Turbine Duke) Maximum Cruising Speed 320 ktas
Normal Cruising Speed 290 ktas
Economy Cruising Speed 225 ktas -
Love this plane. Currently in Greenland on my way to Norway from Canada. The info below is from page 13 of the manual. The numbers seem way too high. I searched but didn't find any other posts about this. Agreed, or am I missing something? A minor fix for a future manual revision.
Aircraft Performance (Turbine Duke) Maximum Cruising Speed 320 ktas
Normal Cruising Speed 290 ktas
Economy Cruising Speed 225 ktas@PAStime Taking a look at the Engine Power Settings section of the manual, you can find power setting and altitude combinations that result in 195-292 KTAS at maximum gross weight, with the maximum cruise speed of 320 KTAS either being achievable at higher than recommended ITT for engine longevity, or minimal loads.
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Thank-you both for the replies. You are right! Although I understand the difference between TAS and IAS, I didn't realize two things until now: how high an altitude the Turbine Duke can fly and how much of a difference there is between the two speeds at that ceiling altitude and temperature.
I just used an online calculator to illustrate it to myself. 200 KIAS at 28,000 feet and -40 C is 308 KTAS! I'll see if I can use the temp/altitude calibration dial on the airspeed indicator to confirm this next time I'm in the virtual cockpit.
