"Ignoramus8901" wrote in message
...
On 2017-08-25, Ed Huntress wrote:
On Fri, 25 Aug 2017 01:25:01 +0000 (UTC), Cydrome Leader
wrote:
Ed Huntress wrote:
On Thu, 24 Aug 2017 19:44:42 -0400, EBsoZZ?? ?????? ? ???????
??TeRcSC
wrote:
Ed Huntress wrote on 8/24/2017 6:42 PM:
If you're interested in this story, it may be in print
somewhere, but
it's also in this podcast that you can listen to online, with
no
add-on apps:
https://www.nytimes.com/2017/08/24/p...s-ukraine.html
Hint: They didn't do it themselves.
It is very easy to make a rocket. The difficult part is the
flight
control unit that keeps the rocket flying straight and narrow
instead of
going in random directions after liftoff and crashing back to
earth near
the launchpad.
A modern smartphone has all the sensors required to let the
rocket
correct its course and guide itself to its destination.
All you need to do is write an App and send the output to an
interface
to control the power of each of the three nozzles (a rocket as no
wings
or rudder, so a minimum of three nozzles would be needed to make
the
rocket go in any direction you want it to).
North Korea makes smartphones:
http://www.telegraph.co.uk/news/worldnews/asia/northkorea/10238617/Kim-Jong-un-visits-North-Korean-smartphone-factory.html
Download this Android App (Sensors Multitool) to read the
sensors:
https://play.google.com/store/apps/details?id=com.wered.sensorsmultitool&hl=en
This "Sensors Multitool" App can read all the sensors in your
Android
smartphone (everything you need to guide a missile to its
destination):
GPS
Rotation Vector
Linear Acceleration
Gravity
Gyroscope
Accelerometer
Magnetic
Pressure
Orientation
The story is about the engines. N. Korea couldn't get a mid-range
rocket to fire reliably. All of a sudden, they're building ICBMs
that
work.
The analysts recently realized why. The engines are Cold-War-Era
Russian -- possibly made in the old Russian heavy-engine factory
in
the Ukraine.
I think you mean mean russia, not ukraine.
The factory is a holdover from the Sobiet days. It's in Ukraine.
But they say they're not making engines for N. Korea. The CIA
probably
knows the answer to this, but it could be that Russian engineers or
unemployed Ukranians are helping N.Korea to build them.
The key point was in realizing what was new about their program. In
roughly one year, they made progress that is widely thought to have
been impossible, or nearly so.
Those engines definitely were made in Ukraine, because no one else
made them. The question is when they were made (now or 30 years ago)
and who sold them, as both Ukraine and Russia have some in stock.
I am sure that making good rocket engines is not as easy as some
people think.
We are in a very interesting new world. For example, countries can
defy the United States and the so called "world order" and get away
with it. This used to be impossible.
i
The V-2 engine design group, mainly Walter Thiel, had enormous
difficulty with the seemingly simple nozzles that injected fuel and
oxidizer into the V-2 combustion chamber.
- "The Rocket and the Reich"
http://www.astronautix.com/v/v-2.html
"Eventually, through a seven-year process of trial and error, a
fuel-cooled rocket engine of 1.5 tonnes thrust and a specific impulse
of 215 seconds was perfected. But all attempts to scale this engine up
to the thrust required for the A4 met insurmountable combustion
instability problems. Finally an interim solution was found to produce
engines for test A4 missiles found. This involved clustering 18 of the
1.5 tonne combustion chambers and feeding their exhaust into a common
'mixing chamber'. In fact this immensely complex 'interim' design had
to be pressed into production."
The extra "found" is where the verb would be in German.