On Oct 12, 1:01*pm, Richard wrote:
On Sep 18, 10:24*am, Mark wrote:

Ok, it's the year 2016. You are in a little Cessna 150.
You're plane isn't pressurized because it will implode,
so you're wearing a pressurized body suit. You have
an oxygen mask. You plane is powered by a very
powerful brushless electric motor supplied by a 20lb
carbon nanotube source that is basically limitless.
Your powerplant is equivalent to 700hp in an LSA.
The electric motor and cabin are heated.

How high can you fly? 95,000ft?

This will soon be a real consideration.

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Mark

At U-2 altitudes it's running (IIRC) close to mach 1 and just barely
above stall speed so I'd venture it's a function of the wing area and
speed + altitude.

"The coffin corner or Q-Corner is the altitude at or near which an
aircraft's stall speed is equal to the critical Mach number, at a
given gross weight and G loading. At this altitude the aircraft
becomes nearly impossible to keep in stable flight. Since the stall
speed is the minimum speed required to maintain level flight, any
reduction in speed will cause the airplane to stall and lose altitude.
Since the critical Mach number is the maximum speed at which air can
travel over the wings without losing lift due to flow separation and
shock waves, any increase in speed will cause the airplane to lose
lift, or to pitch heavily nose-down, and lose altitude. The "corner"
refers to the triangular shape at the top of a flight envelope chart
where the stall speed and critical Mach number lines come together."

http://en.wikipedia.org/wiki/Coffin_corner_(aviation)

---
Mark