Lies...

L, M, N, P, Marquis, and Solitaire were 6.0 or 6.1 or whatever.
Can’t see that resolution on the little needle anyway.

Realized I had to correct this after some recollection.

But cool list.
More is better.
Lear 31 is 9psi. And there i sat at FL510 with barely 2psi outside the plane hanging on the cabin controller for dear life.

Space isn’t all that bad. 15psi cabin and you got Sea Level.

Tj

Like Joel, we see 5.5 psi at 30,000 feet on our M600 as well. The max DIff is 5.6, but I think the computer leaves .1 just so that you don’t bump up against the release valves

Thank you, thank you, thank you, awesome... !!!

Just for clarification on Commanders:

Piston 680FLP/FP: 3.2psi
Piston 685: 4.2psi
Turbine 680 (T, V, W) and 681: 4.2psi
Turbine 690: 4.2psi

Only with the 690 A and B models did pressure go up to 5.2psi.

One of my few complaints about the M600 is that the pressurization is all automatic and even though you can go 5.6 psi diff, the computer keeps the cabin between 9k and 10k above FL260, which means below FL280 you never see even 5.5 psi. The plus side of this is you send your flight plan from ForeFlight to the G3000 and never touch anything pressurization related. The only thing I do is check the displayed landing field elevation and use that to VNAV my way to pattern altitude.

The juice is worth the squeeze.

5.5 in Aerostar means tomorrow I will be FL230 with a 6,500ish cabin.

I’m a flat lander who gets a headache occasionally on longish commercial flights and their 8,000 foot cabins.

737 is designed to hold a max cabin altitude of 8,000'. The 787 and 777X keep it no higher than 6,000' and they go to 43,000', which is higher than 737s.

Editing period is over. I'm putting this together in a public spreadsheet that's actually useful to pilots. Stay tuned....

Epic (both LT and E1000) and Evolution are all 6.5 psi

OK, here it is. Please check out the spreadsheet linked at the bottom of this post. It's the first time I've seen a table in this format, and it answers the pressure question in the format that pilots want to ask:

If my cabin pressure is 5.2 psi, what is my cabin altitude at flight level 250?

It's a table with pretty much all propeller pressures and flight levels. It's based on a standard atmosphere, of course - I don't have anything built yet for ISA -10 or +20.

The formula is a horrible mix of SI and imperial units with a few shortcuts thrown in, but I have confidence in its accuracy. It does take the change in lapse rate at the stratosphere into effect, but only on the forward calculation. It does not take cabin temperature into effect. Translation: The cabin altitude is off by a little when the flight level is over 36,00 feet, but it affects the lower pressures more than the higher ones.

Let me know what you think.

I'm going to put the makes & models on the second page of the spreadsheet. Look for the tabs at the bottom to change pages.

https://docs.google.com/spreadsheets/d/ ... sp=sharing

And if you don't like spreadsheets, here's a screenshot of the table:

I've had an app for a few years here: http://avionictools.com/ select "Cabin Alt". It has been years since I updated the models, guess I should update all of these. Fairly close to your calcs.

I don't see P-baron on the list.

Just added it, for both before and after 1979 models.

I don't fly Dukes every day but I think most of the legacy piston pressurized twins are regulated about .2 below redline.

For what it is worth, Duke is 4.6 redline but typically regulated at 4.4 PSI.

Aerostar stock is redlined at 4.5, regulated at 4.3 or so.

Notable that the Aerostar 5.5 PSI upgrade gets the full 5.5 PSI at the regulated pressure, with a 5.75 or 5.8 redline.

It seems most of the others are commonly referred to at the redline and not the regulated pressure.