On Mon, 27 Sep 2010 13:47:57 -0400, Orval Fairbairn wrote:
In article ,
"Ash Wyllie" wrote:
Ari Silverstein opined
On Mon, 20 Sep 2010 06:10:02 -0700 (PDT), Mark wrote:
On Sep 19, 7:24*pm, "Ash Wyllie" wrote:
How high can you fly? 95,000ft?
This will soon be a real consideration.
I don't have the figures available at the moment, but I can tell you what
to look for and what to do.
Find the Vs for a C152.
Find the Mmo, likely about M.75.
Your max altitude is where the true Vs == Mmo.
* * * * * * * * * * * * *-ash
* * * * * * * * * * * * *Elect Cthulhu!
* * * * * * * * * * * * *Vote the greater evil.
Thank you so much! Can't wait to run the numbers.
Had this been a contest, you just walked off with a
new trophy.
---
Mark
How'd those numbers come out there, Mark(ie)? It's only been a week.
*ROFL*
Markie seems to be too busy to do his homework. Poor guy.
So I'll do it for him, and give him an F.
Formulae Units mks
TAS = exp(alt/15150) * CAS
Vsound = 340 * sqrt(1 - alt/86400)
Assume a Mmo of .6 and Vs of 25m/s (50kts) your coffin corner is about 28500m
(95000').
What the real figures for a C152, I don't know.
Ash,
I don't know where you got your formula, but MY "Elements of
Gasdynamics" book says that:
Vsound = sqrt(gamma*R*T),
where (for air):
gamma = 1.4 universal gas constant
R = 1715 ft-lb/slug-deg F
T = absolute temperature in Rankine
Nonetheless, the hypothetical C150 would encounter coffin corner before
it gets to 95Kft.
Hardly, I have on my Mark Of The Universe designed spacesuit.
Ok, it's the year 2025. If man is still alive.
I am in a little Cessna 150.
My plane isn't pressurized because it will implode,
so I'm wearing a pressurized body suit. I have
an oxygen mask. My plane is powered by a very
powerful hydrogen atom splitting energy source.
Supplied by a 20oz plutonium nanotube source that is
completely limitless that I designed. I plumbed and
wired my own trailer, too.
My powerplant is equivalent to 700000000Mhp in an LSA.
How high can I fly? End of the Milky Way?
This will soon be a real consideration.
Here's the space suit I invented.
http://tinyurl.com/2vg9h4f
Mark Of The Universe