BeechTalk - BT

Username Protected · **Posted:** 25 Apr 2017, 20:05

Haven't had time to catch up on these threads, anything new?

AG

Username Protected · **Posted:** 25 Apr 2017, 20:12

Username Protected wrote:

Haven't had time to catch up on these threads, anything new?

AG

Mike C has gone MIA....

Several theories...

1. Best BT troll of all time and he's off taking delivery of his SF50
2. He decided if he couldn't say anything nice he wouldn't say anything at all
3. Had an epiphany that a single engine jet for short hops makes sense and that piston drivers looking to move up it fills a great niche.
4. Every plane should have a parachute....

What's your theory?

Peace,
Don

Username Protected · **Posted:** 25 Apr 2017, 20:31

Username Protected wrote:

Haven't had time to catch up on these threads, anything new?

AG

SS DD

Username Protected · **Posted:** 25 Apr 2017, 22:00

Username Protected wrote:

Haven't had time to catch up on these threads, anything new?

AG

SS DD

Username Protected · **Posted:** 25 Apr 2017, 22:40

Any hangars available there for a TBM, Arlen?

Username Protected wrote:

My 2008 PC12 is 9 years old.

I can tell the difference when I'm in a new one.

Jason,

When you need to quietly slide that 9 year old piece of slumjack out of your life, you can park it here at Massey Airpark; I'll watch over it and exercise it regularly, and I won't even criticize its age, wrinkles, and stretch marks.

Jet A is just $2.99 here.

Username Protected · **Posted:** 25 Apr 2017, 22:55

Username Protected wrote:

Isn't the pressurization less than 5 psi? I couldn't find it listed on their website.

Web search says 5.5 psi.

Username Protected · **Posted:** 25 Apr 2017, 23:02

Username Protected wrote:

A 2017 PC12 to the "lay person" looks exactly the same as mine. But it's not. There have been a lot of upgrades.

Synthetic Vison and other avionics upgrades
Electric gear instead of hydraulic
5 blade Hartzell prop
Lots of body mods to streamline
LED lights everywhere inside and out
More modern paint and interior
better soundproofing

I can tell the difference when I'm in a new one.

That list doesn't impress me much. Would you trade in your plane + 2m for that? I wouldn't if I were you. Maybe just add the 5 blade prop to yours.

Username Protected · **Posted:** 25 Apr 2017, 23:42

Username Protected wrote:

I asked a Cirrus Vision instructor and he says it's 6.4 psi. Where does the "web" say 5.5?

Searched for "Cirrus SF50 cabin pressurization psi". Only number found in the first 3 pages were 5.5 psi. Examples:
http://www.fsd-international.com/Hangar ... ndbook.pdf
http://www.thefullwiki.org/Cirrus_Vision_SF50

Username Protected · **Posted:** 26 Apr 2017, 03:34

Username Protected wrote:

Searched for "Cirrus SF50 cabin pressurization psi". Only number found in the first 3 pages were 5.5 psi.

Cirrus claims an 8000 ft cabin in cruise. At 5.5 psi, cruise would be limited to FL250. The maximum operating altitude is FL280. To keep an 8000 ft cabin requires around 6.2 psi, though I was told max diff is 6.4 psi.

Username Protected · **Posted:** 26 Apr 2017, 07:24

Username Protected wrote:

That list doesn't impress me much. Would you trade in your plane + 2m for that? I wouldn't if I were you. Maybe just add the 5 blade prop to yours.

The real question to ask is...... "Do I put a bunch of money into a 10 year old plane or sell it and just get what I want in a new one"?

A new 2017 PC12 is $5MM. My 2008 PC12 was bought new for $3.3MM. The price difference between the 2 planes is real. It's not just depreciation.

So yes, I would sell mine and buy a new one before I would put paint and interior and hot section and wing removal inspection into mine. At this point, any money I put into my 10 year old PC12 will not make it sell for more money.

Username Protected · **Posted:** 26 Apr 2017, 10:56

May as well cough up another 4 million and get a PC24. :clap:

Username Protected · **Posted:** 26 Apr 2017, 11:02

Username Protected wrote:

Any hangars available there for a TBM, Arlen?

There are still a couple of lots. Build one.

Username Protected · **Posted:** 26 Apr 2017, 11:25

Username Protected wrote:

Searched for "Cirrus SF50 cabin pressurization psi". Only number found in the first 3 pages were 5.5 psi.

Cirrus claims an 8000 ft cabin in cruise. At 5.5 psi, cruise would be limited to FL250. The maximum operating altitude is FL280. To keep an 8000 ft cabin requires around 6.2 psi, though I was told max diff is 6.4 psi.

Username Protected · **Posted:** 26 Apr 2017, 11:39

Username Protected wrote:

Is this correct that 6.2 is required for a 8,000' cabin at FL 280? I have 5.5 pressurization. Checking an available log, I don't see the cabin altitude recorded for flights at FL 280, but it does show I get a 7,800' cabin at FL 270. There must be a formula for figuring pressurization differential if you know aircraft and cabin altitude or for figuring cabin altitude if you know differential and aircraft altitude? It would be helpful to know the formula to cross check the accuracy of the gauges.

If my memory is correct, you lose ~0.5 PSI per thousand feet on average until some point in the lower 30s. I forget where, and I know it changes with latitude. So at FL280 with a 5.5 differential, you should have a cabin altitude of 7K. (.5 * 11 = 5.5; 28K minus 11K)

Tim

Username Protected · **Posted:** 26 Apr 2017, 11:52

That's a very rough rule of thumb, Tim. Standard ISA pressure at FL 280 is 4.8 psi, so 5.5 psi differential gets you to 10.3 psi, which is about 9500 feet. 6.4 psi differential gets you to 11.2 psi, or 7500 feet.

8000 foot cabin at FL 280 requires 6.1 psi differential.

Nathan