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glennh(at)GMAIL.COM
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 Posted: Mon Jul 20, 2015 6:28 pm Post subject: 680FP Speed Question |
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So I purchased the 680FP and had my mechanic fly it back to TN from NM. It was about a 600nm trip and I followed him in my 310Q with my wife and 3 year old son. We flew back at 9500 and he went up to 13500. I am not sure how he managed the engines or how he did anything for that matter, but what I was most interested in was his speed. I purchased this airplane with the understanding that it was at least a 200knot airplane.
So we took off and proceeded to fly cross country for 3 hours. To my absolute disappointment he arrived 7 minutes ahead of me. He said he was doing 181MPH indicated which was basically the same speed I was doing in my 310 at a lower altitude.
So my question is: Was I dupped and the 680Fp is the same speed as the 310Q? Except it burns twice as much gas. Or was he perhaps not flying it properly? I still love the plane and not changing my mind, just won't be quite as happy with it if it's that slow. It has flap gap seals and winglets although I'm not sure how much either adds to actual speed. He averaged about 55gph fuel burn compared to my 26gph.
Even at 190kts he should have been indicating 220mph.
Thanks,
--
--glenn hancock
You can't win an argument with an ignorant person. They'll just drag you down to their level and beat you with experience.
[quote][b]
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cloudcraft(at)aol.com
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| Posted: Mon Jul 20, 2015 7:19 pm Post subject: 680FP Speed Question |
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Glenn,
Using ISA conditions for 13,500', 181 Indicated is 223 True.
Lots of questions need to be answered before a performance comparison can be made.
- Winds aloft at both altitudes
- Power settings
- Climb and descent profile
At the end of the day, you might find the CE310 has similar cruise performance to how you operate your Commander.
What will separate the sheep from the goats is the load you can carry off that 3000' grass strip you want to base at.
K.S.Gordon
Sent on the Fly🌐
-------- Original message --------
From: Glenn Hancock <glennh(at)GMAIL.COM>
Date: 20/07/2015 20:27 (GMT-07:00)
To: commander-list(at)matronics.com
Subject: Commander-List: 680FP Speed Question
So I purchased the 680FP and had my mechanic fly it back to TN from NM. It was about a 600nm trip and I followed him in my 310Q with my wife and 3 year old son. We flew back at 9500 and he went up to 13500. I am not sure how he managed the engines or how he did anything for that matter, but what I was most interested in was his speed. I purchased this airplane with the understanding that it was at least a 200knot airplane.
So we took off and proceeded to fly cross country for 3 hours. To my absolute disappointment he arrived 7 minutes ahead of me. He said he was doing 181MPH indicated which was basically the same speed I was doing in my 310 at a lower altitude.
So my question is: Was I dupped and the 680Fp is the same speed as the 310Q? Except it burns twice as much gas. Or was he perhaps not flying it properly? I still love the plane and not changing my mind, just won't be quite as happy with it if it's that slow. It has flap gap seals and winglets although I'm not sure how much either adds to actual speed. He averaged about 55gph fuel burn compared to my 26gph.
Even at 190kts he should have been indicating 220mph.
Thanks,
--
--glenn hancock
You can't win an argument with an ignorant person. They'll just drag you down to their level and beat you with experience.
[quote][b]
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alexandc10(at)aol.com
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| Posted: Tue Jul 21, 2015 4:17 am Post subject: 680FP Speed Question |
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I haven't flown the FP, but 181 MPH indicated (IAS) at 13500 is 198 knots TAS. If you were under the impression that the airplane would INDICATE 200 knots at 13500, then that's simply not going to happen. That's 250+ KTAS. The seven minutes could be explained by higher head-winds at 13500, time-to-climb, more conservative descent, etc.
If you're saying he was doing 181 (MPH) TRUE airspeed at 13500, then that seems also unlikely, as that's 158 Knots (KTAS), and you would likely have beaten him home.
Net, if you're only 2 KTAS off book on a 50 year old airplane, sounds pretty good!
AD
--
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