Marc Wiese wrote:

The 1996 corvette GM 12v electric motor driven air pump I have weighs just
2 lbs, 4 oz. I have no idea what amount of air it will supply yet.

Paul Lamar teased:

Fill a balloon and weigh it before and after :-)
Anybody care to do the math on the results?

Very funny Paul.  Without knowing the "strength" of the balloon, or at least
the pressure of the air within, one cannot determine the amount of air the
pump will supply.

BTW, since your considering this pump for vacuum power instruments, wouldn't
it be better to measure the amount of air it consumes (generating vacuum)
rather the amount of air is supplies?  :-)

Russell Kent
[See, I can be a smart aleck, too.]

Paul replied:

You are missing something Russell. Hint: What does air weigh?

I ain't missing nothin'. How much air have you got?  Hint: balloons fly because
they weight less than the surrounding air.

Russell Kent

Helium, hydrogen and hot air balloons fly. Others just sit there.
The rubber is stretched until the air pressure inside plus the rubber
tension equals the surrounding air pressure. The balloon also
has a displacement just like a boat in water. This reduces its
apparent weight and must be accounted for.

As I said it is easier to hook the pump to the gyro.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.
ACRE NL web site.
http://home.earthlink.net/~rotaryeng/            http://www.linux.org