[GreenKeys] Fw: Re: Teletype and electronics........

[COURYHOUSE at aol.com]

V-2 Burn Times - 
 
and... in reality     for the London flight the   bur  time  was  about  
only a minute.. I  would imagine  the 3 minute time  was    a test stand  
value   before damage  was  noted.
 
 
Engine: Model 39 rocket motor, 60,000 lbs of thrust, 68 second burn time
Fuel: liquid oxygen and a combination  of 75% alcohol and 25% water
Length: 46 feet
Diameter: 5 feet, 6  inches
Finspan: 12 feet
Weight: 27,000 lbs fully fueled
Range: 150-200  miles
Speed: 3400-4100 mph
Altitude: 180-190 miles (some may have flown as  far as 220 miles)
Payload: 2000 lb war head 

Ed#   smecc.org
 
 
In a message dated 4/11/2013 9:13:16 A.M. Mountain Standard Time,  
jhhaynes at earthlink.net writes:

On Thu,  11 Apr 2013, Peter Gottlieb wrote:

> Western Union.  The 33,  despite being a lot cheaper in construction than 
the 
> 28 or even the  35, still gave me probably into the thousands of hours of 
> service  with only minimal maintenance.  I did tons of coding on it,  ran

The original market intended for the 32/33 line was TELEX/TWX  service
in business offices where the machine didn't get much use.   Two hours
a day was frequently mentioned.

Then the minicomputer  business happened, especially in the era of cheap
integrated  circuits.  The 33 was a natural choice to go with a 
minicomputer  because it was the cheapest thing out there with a keyboard
and printer and  paper tape punch and reader to take care of the minimal
I/O needs of the  machine.  So the Model 33s were suddently being run
24/7.  (And  Burroughs even chose a 33 for the console device on their
B5500 mainframe,  replacing a modified electric typewriter.  But except
for having the  motor running 24/7 the 33 on the B5500 didn't get heavy
use - just job  start and stop messages and taking commands from the
operator.)

So  one could argue that the M33 went a long way to making the  minicomputer
affordable for a lot of applications where a better terminal  would have
priced it out of the market.  And then when time sharing  came along with
the Dartmouth system, and later with time sharing on  minicomputers, the
M33 was again the most economical terminal for the  job.

It is said that Teletype was planning to use felt clutches in the  32/33
line but was persuaded by Western Union to adapt the Model 28 style  all-
metal clutches.  That went a long way to reducing the  maintenance
requirements.

I once heard a talk given by one of the  principal designers of the 32/33
line, early in its product life.  He  referred to an editorial in a
mechanical design engineering magazine of the  period.  The editor had
been invited by the U.S. Army to view some of  the after World War II
tests of German V-2 rockets at White Sands Proving  Ground.  He was duly
impressed with the intense light and heat evident  in the rocket exhaust,
and asked one of the German engineers near him what  material the engine
was made of.  "Stahl, eisen stahl" (steel, iron  steel) was the reply.
He expressed his amazement that ordinary steel could  stand up to the
tremendous heat.  The German's explanation was, "Drei  minuten."  Three
minutes - that's how long the engine had to  last.  So "Drei minuten"
became a motto for the Model 32/33  designers.

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