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#Post#: 57348--------------------------------------------------
SR-71
By: Cut4fun Date: April 25, 2015, 4:41 pm
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copy paste
HTML https://throt-l.com/wp-content/uploads/2015/01/gigantic-rc-turbin-jet-powered-sr-71-blackbird-aircraft-show-1024x536.jpg
The SR-71 Blackbird Full Air Force Version
To really understand this jet, which first appeared in the U.S
Air Force in 1964, you have to understand that as a recon jet
this was a tool that was way ahead of its time. It was also
ahead of it’s time in terms of manufacturing. The 1967 fleet of
Blackbirds totaled just 31 jets. That number might seem
shockingly low, but not much available could touch them. They
were literally the fastest things on earth.
To develop this jet, new barriers to speed and environment had
to be broken. The jet could travel at Mach 3.2 which is not just
about dealing with the sound barrier, but also the heat barrier.
Friction is wicked at that speed. The outside shell of the jet
reached temperatures of over 1050 degrees Fahrenheit. That
translates to 838.7 Kelvin. Lava from a volcano as it is
erupting reaches a Fahrenheit temperature of 1200-2000 degrees.
So we are talking nearly a hull temperature equivalent of lava.
The black coloring on the jet is part of its ability to handle
all of that heat. In later generations the black coloring also
helped to deal with absorbing radar.
The frame of the Blackbird is made out of Titanium which is one
of the strongest and lightest metals on earth. The jet
experiences a great deal of G-force when maneuvering at high
speeds. To match the structural integrity of the jet, every
other system on the plane had to be equally as strong. Nobody
wants to be the pilot of a jet moving at Mach 3.2 when the
windshield gives out and leaves you exposed to what must be an
instant death.
Furthermore, systems like the hydraulic systems must be able to
deal with pressure, heat, and function at 100 percent capacity
when needed. These are machines of war. They must function as
intended at all time. The power of this weapon was the ability
to deploy it instantly. Keep in mind that the alternative was a
satellite weapon system, but even when in orbit, a satellite
cannot easily be coerced into changing position. Satellites also
have a very narrow window when they can target an object. The
Blackbirds on the other hand could be launched and strike
quickly.
RC A-12 SR-71 Blackbird Stats:
Length = 3250 mm
Wing span = 1730 mm
Powered by twin AMT Olympus RC Jet Turbine Engines
Thrust @ S.T.P. 190 N/19.4kg @110,000 RPM
42.7 Lbf @ 110,000 RPM
Max RPM 112,000
Burns 19 ounces of fuel per minute at 42.7 Lbf
In short, it is every bit of the word Jet as it’s bigger
version. The video shows the speed capabilities and the air
agility that this RC model possesses. Do you want one as bad as
I do right now?
In the video, it might look simple, but flying one of these via
remote control is not easy. It takes a considerable amount of
skill, and officially, I’d like to say congrats to the pilot for
his easy 3-point landing. How many of you think you could fly
and land this incredible micro aircraft without crashing?
#Post#: 57349--------------------------------------------------
Re: SR-71
By: Cut4fun Date: April 25, 2015, 4:42 pm
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HTML https://youtu.be/1lYGUROZ_Pg
#Post#: 57352--------------------------------------------------
Re: SR-71
By: aclarke Date: April 25, 2015, 5:35 pm
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Sweet. Wonder if the model leaks JP-7 like a sieve til the
airframe gets up to temperature and seals the wet wings? Lol.
#Post#: 57358--------------------------------------------------
Re: SR-71
By: adam32 Date: April 25, 2015, 6:39 pm
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[quote author=aclarke link=topic=4887.msg57352#msg57352
date=1430001331]
Sweet. Wonder if the model leaks JP-7 like a sieve til the
airframe gets up to temperature and seals the wet wings? Lol.
[/quote]
Lol!!!!!!!!!!!!
#Post#: 57370--------------------------------------------------
Re: SR-71
By: Chainsawrepair Date: April 25, 2015, 8:49 pm
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[quote author=aclarke link=topic=4887.msg57352#msg57352
date=1430001331]
Sweet. Wonder if the model leaks JP-7 like a sieve til the
airframe gets up to temperature and seals the wet wings? Lol.
[/quote]
Thanks for bringing that to my attention. Neat read.
I had a roommate that was from Thousand Oaks Calif and guarded
those in Calif for part of his bit.
Copy paste.
Fuselage panels were manufactured to only loosely fit on the
ground. Proper alignment was achieved as the airframe heated up
and expanded several inches.[29] Because of this, and the lack
of a fuel sealing system that could handle the airframe's
expansion at extreme temperatures, the aircraft leaked JP-7 fuel
on the ground prior to takeoff.
#Post#: 57371--------------------------------------------------
Re: SR-71
By: Chainsawrepair Date: April 25, 2015, 8:50 pm
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I liked this part too.
On most aircraft, use of titanium was limited by the costs
involved; it was generally used only in components exposed to
the highest temperatures, such as exhaust fairings and the
leading edges of wings. On the SR-71, titanium was used for 85%
of the structure, with much of the rest polymer composite
materials. To control costs, Lockheed used a more easily worked
titanium alloy which softened at a lower temperature. The
challenges posed led Lockheed to develop new fabrication
methods, and have since been used in the manufacture of other
aircraft. Welding titanium requires distilled water, as the
chlorine present in tap water is corrosive; cadmium-plated tools
could not be used as they also caused corrosion. Metallurgical
contamination was another problem; at one point 80% of the
delivered titanium for manufacture was rejected on these
grounds.
#Post#: 57372--------------------------------------------------
Re: SR-71
By: Chainsawrepair Date: April 25, 2015, 8:54 pm
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The Blackbird's tires, manufactured by B.F. Goodrich, contained
aluminum and were filled with nitrogen. They cost $2,300 and did
not last 20 missions.
Several exotic fuels were investigated for the Blackbird.
Development began on a coal slurry powerplant, but Johnson
determined that the coal particles damaged important engine
components. Research was conducted on a liquid hydrogen
powerplant, but the tanks for storing cryogenic hydrogen were
not of a suitable size or shape. In practice, the Blackbird
would burn somewhat conventional JP-7 which was difficult to
light. To start the engines, triethylborane (TEB), which ignites
on contact with air, was injected to produce temperatures high
enough to ignite the JP-7. The TEB produced a characteristic
green flame, which could often be seen during engine ignition.
#Post#: 57379--------------------------------------------------
Re: SR-71
By: aclarke Date: April 25, 2015, 10:01 pm
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We had a Pratt Whitney J58 motor (SR-71) as well as a couple
early rocket motors xlr-11 and xlr-99 (X1 &X15) at our A&P
school on loan from NASA. Cool stuff!!
The Instructors at the College grew up in the CA Central Valley
and are good friends with Chuck Yeager. Mr Yeager, came to the
College to hang out with out graduating class for a morning and
shared a lot of super cool flying stories from his days in
aviation.
Cool experience...
#Post#: 57381--------------------------------------------------
Re: SR-71
By: 660magnum Date: April 26, 2015, 12:42 am
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I remember back in 1966/67 those things would fly over and the
boom was almost upsetting. Sometimes you could even hear the jet
engines after the boom passed. They would definitely rattle the
dishes. I never saw one, just heard the booms.
#Post#: 63404--------------------------------------------------
Re: SR-71
By: Moparmyway Date: October 16, 2015, 4:57 pm
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[quote author=Cut4fun link=topic=4887.msg57348#msg57348
date=1429998064]
How many of you think you could fly and land this incredible
micro aircraft without crashing?
[/quote]
I know I easily could ;D
HTML https://www.youtube.com/watch?v=Kec66ZQdPyA
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