24 Nov 2025, 15:36 [ UTC - 5; DST ]
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Username Protected
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Post subject: Re: Piper M700 Pirep  Posted: 22 Nov 2025, 04:15 |
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Joined: 07/11/11
Posts: 1674
Post Likes: +479
Location: Redwood City, CA (KPAO)
Aircraft: 1967 Bonanza V35
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Silly me, forgot the forum rules. This thread is worthless without pics. Attachment: IMG_6640.jpeg Attachment: IMG_6638.jpeg Attachment: IMG_6642.jpeg Attachment: IMG_6646.jpeg Attachment: IMG_6636.jpeg
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Post subject: Re: Piper M700 Pirep Posted: 22 Nov 2025, 10:02 |
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Joined: 01/07/21
Posts: 427
Post Likes: +424
Aircraft: M20J/R, Sr22, SR20
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David,
Love to have you share your flying impressions, your performance, etc. Be great to know.
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Username Protected
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Post subject: Re: Piper M700 Pirep Posted: 22 Nov 2025, 10:50 |
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Joined: 01/12/10
Posts: 578
Post Likes: +1072
Location: Dallas, Texas
Aircraft: Piaggio P180, T-6
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Username Protected wrote: Anyone know the cabin altitude for a Piper Fury/700 at 17,500 cruising altitude? Around 3400'. Here's a calculator that you can play with... 5.5 PSI diff. https://www.avionictools.com/presscalc.php
Yeah that’s assuming it’s linear, I read somewhere it doesn’t max dif unless you are at service ceiling…
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Post subject: Re: Piper M700 Pirep Posted: 22 Nov 2025, 21:12 |
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Joined: 03/04/14
Posts: 2021
Post Likes: +935
Location: FREDERICKSBURG TX
Aircraft: MOONEY M20TN
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Username Protected wrote: Yeah that’s assuming it’s linear, I read somewhere it doesn’t max dif unless you are at service ceiling… Cabin altitude at 17,500 is a non-issue on a P46T. Somewhere between sea-level and 4000, what difference does it really make? I would be much more concerned about fuel burn at that altitude. This mission for this airplane, or any turbine for that matter, is "climb as high as you can, as fast as you can, and stay there as long as you can".
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Post subject: Re: Piper M700 Pirep Posted: Yesterday, 09:00 |
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Joined: 07/17/15
Posts: 564
Post Likes: +565
Location: KSRQ
Aircraft: C510
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Username Protected wrote: Yeah that’s assuming it’s linear, I read somewhere it doesn’t max dif unless you are at service ceiling… Cabin altitude at 17,500 is a non-issue on a P46T. Somewhere between sea-level and 4000, what difference does it really make? I would be much more concerned about fuel burn at that altitude. This mission for this airplane, or any turbine for that matter, is "climb as high as you can, as fast as you can, and stay there as long as you can".
You’re talking less than a hundred pound penalty, on a 500nm leg, flying VFR in the Meridian. That’s peanuts in the turbine world.
_________________
Tony
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Post subject: Re: Piper M700 Pirep Posted: Yesterday, 11:58 |
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Joined: 07/06/14
Posts: 4094
Post Likes: +2835
Location: MA
Aircraft: C340A; TBM850
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Username Protected wrote: I would be much more concerned about fuel burn at that altitude. This mission for this airplane, or any turbine for that matter, is "climb as high as you can, as fast as you can, and stay there as long as you can". You’re talking less than a hundred pound penalty, on a 500nm leg, flying VFR in the Meridian. That’s peanuts in the turbine world.
Agreed. Most flights aren't the 1000+nm legs where you need to go as high as possible. The other rule is "fuel is the cheapest thing you put in the airplane". For shorter length legs, I find I pick altitude on speed and weather, and getting as high as possible has little advantage.
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