[Phys-L] Re: Newton's Equation - 2 or 3 terms?

[Brian Whatcott <betwys1@SBCGLOBAL.NET>]

At 09:11 PM 9/5/2005, Bernard,  you wrote:

> If the burning area increases, e.g. from the cross section to conical,
> the F increases.  It will then decrease as the initial burning part
> exhausts. Whatever, the mass decreases and not at a constant rate.  The
> early cruise (V 1) and the ballistic (V 2)  missiles,  I assume, used
> pressure feed  (liquid fuel), in which case the force decreased as the
> fuel exhausted.  What ever happens, w/ modern tech. the computer will
> compensate.

The V1 was a pulse jet firing 80 octane gasoline in atmospheric air.
Compressed air bottles ran the gyro autopilot, and (presumably)
  motivated  the gasoline sprays.   It cruised at 400 mph at
  9000 ft or less.
[ from  <http://www.fiddlersgreen.net/aircraft/WWII/v1/v1_info/vi_info.htm> ]



The V2 was propelled by alcohol (a mixture of 75% ethyl alcohol and
  25% water), and liquid oxygen fuel. The two liquids were delivered
to the thrust chamber by two rotary pumps, driven by a steam turbine.
  The steam turbine operated at 5,000 rpm on two auxiliary fuels,
  namely hydrogen peroxide (80 %) and a mixture of 66% sodium
  permanganate with water 33%. This system generated about
  55,000 lbs (24947 kg) of thrust at the start, which increased
  to 160,000 lbs (72574 kg) when the maximum speed was reached.
  The motor typically burned for 60 seconds, pushing the rocket
  to around 4,400 ft/second (1341 m/sec).
   It rose to an altitude of 52 to 60 miles (83 to 93 km) and had
a range of 200 to 225 miles (321 to 362 km). The V2 carried an
  explosive warhead (Amatol Fp60/40) weighing approximately
738 kg (1 ton) ...

[from  <http://www.v2rocket.com/start/makeup/design.html> ]


Brian Whatcott    Altus OK    Eureka!
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