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PBE Shield Stickers and Deagle Boltface Patches On Sale Now!



File 146955149770.jpg - (308.66KB , 894x1600 , ss Udvar 000.jpg )
21058 No. 21058 ID: 9dcda2
https://airandspace.si.edu/

> The Steven F. Udvar-Hazy Center, also called the Udvar-Hazy Center, is the Smithsonian National Air and Space Museum's annex at Washington Dulles International Airport in the Chantilly area of Fairfax County, Virginia, United States

I checked out the Udvar-Hazy Center. Pretty damn cool. I got a little emotional around the Space Shuttle Discovery. I wasn't trying to document the whole museum, I just snapped some pictures of cool stuff. (With a specific interest in engines.)
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>> No. 21144 ID: 699348
>>21088
I've never seen the power plant(s?) next to the aircraft before.
What the fuck.
That thing is absurd.
>> No. 21145 ID: 30f399
File 146965444046.jpg - (1.67MB , 1365x2048 , US F-35B STOVL Rolls-Royce lift system 1.jpg )
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>>21144
US F-35B short takeoff vertical landing (STOVL) variant of the Joint Strike Fighter. Her Pratt & Whitney F135 engine with the STOL lift fan, roll posts and rear vectoring nozzle is very complicated and the developers are still working the problems out. Threats of cancelling the F-35B jump-jet abound.
http://www.operatorchan.org/v/res/15487.html#17736
>> No. 21146 ID: 30f399
File 146965451317.jpg - (1.61MB , 2048x1365 , US F-35B STOVL Rolls-Royce lift system 2.jpg )
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>> No. 21147 ID: 30f399
File 146965461334.jpg - (1.42MB , 2048x1362 , US F-35B STOVL Rolls-Royce lift system 3.jpg )
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The rear jet nozzle twists down for vertical landings.
>> No. 21148 ID: 30f399
File 146965462918.jpg - (248.42KB , 2048x1448 , US F-35B STOVL Rolls-Royce lift system 4.jpg )
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>> No. 21149 ID: 30f399
File 146965475522.jpg - (958.84KB , 4000x2667 , US AV-8B Harrier II (BAE McDonnell-Douglas) 2nd ge.jpg )
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The F-35B was designed to operate from smaller Harrier carriers and replace the old AV-8B Harrier.

AV-8B Harrier jets with Marine Attack Squadron 311 fly over Helmand province, Afghanistan, June 10, 2013. The jets received aerial refueling support from a KC-130J Hercules aircraft with Marine Aerial Refueler Transport Squadron 252 before continuing their air operations.
>> No. 21150 ID: 30f399
File 146965499838.jpg - (0.98MB , 5000x3333 , US AV-8B Harrier over Afghanistan 2013 1.jpg )
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A U.S. Marine Corps AV-8B Harrier aircraft assigned to Marine Attack Squadron (VMA) 311 flies over Helmand province, Afghanistan, June 10, 2013.
>> No. 21153 ID: 088449
  >>21144

Yeah, the forward thing is a fan that blows down for Short TakeOffs and Vertical Landings. (STOVL)

Rather than the AV-8B Harrier's method of just using jet exhaust, the F35 uses a lift fan that's connected by a drive shaft to the engine. A sort of hybrid convertible turbofan / turboshaft engine.

The T56 >>21106 is the classic example of a turboshaft engine. Rather than producing thrust, it makes shaft horsepower.

https://en.wikipedia.org/wiki/Allison_T56

The more I think about it, the insane it seems. What kind of buttfuckery is going on here?
>> No. 21154 ID: 9723b1
File 146967430538.png - (74.37KB , 2091x2506 , US06926231-20050809-D00005.png )
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>>21153
The Russian version just has two lightweight turbojet engines instead of one massive pseudoturbofan. Why did they use the fan? The only advantage of a fan I can think of is better fuel efficiency, but that obviously isn't the case here (or needed).
Why didn't they use two tiny compact turbojet engines? Could even use the Boeing PETA.
>> No. 21155 ID: d4c8ee
File 146967801230.jpg - (1.11MB , 5615x3159 , 140910-M-SR938-996.jpg )
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>>21154
Because separate lift jets have been operationally shown to be inferior due to the added weight and lower power.

Combined lift from the two lift jets on the Yak-38 was 64 kilo Newtons of thrust.

Lift from the original GR3 Harrier's Pegasus (single engine with four directed vents) was 97kN, the AV-8B and GR9 increased this to 105 and 110kN respectively.

Combined lift from the F-35B's Rolls-Royce lift system (tail exhaust, the fan, two wing ducts) is 186kN.
>> No. 21156 ID: 9723b1
>>21155
The commie version of F-35 is the Yak-141, not Yak-38.

The main reason it's a superior idea is that the thrust of the mini jets is independent of the main engine, whereas in F-35 the fan is sapping power from the engine itself.
Yak-141: [42kN + 42kN front lift] + 152kN main = 235kN. More lift power on a lighter aircraft is why the Yak-141 is a true VTOL whereas F-35 is STOVL.

Especially with something like PETA providing thrust, which has fewer moving parts and can be a load bearing structure member. Only downside is high fuel consumption and noise, but since it's only going to be active during landing and takeoff it's not really an issue.
>> No. 21157 ID: d4c8ee
>>21156
>Yak-141

Key word here is that I said "operationally."

But if we're expanding to "failed prototypes", like the Yak-141 the XV-4, VAK 191B, VJ 101, Mirage Balzac V and Do 31 all tried to use separate vertical jets, and were all canceled for a lack of performance. Likewise the Convair 200 concept (which "inspired" the three-bearing tail pipe on the Yak-141) ended up being shelved for similar reasons before the Sea Control Ship program got killed.

>152kN main

That's afterburner thrust, which would not be used for vertical flight, due to the Yak-141 being unable to hover for more than 150 seconds due to heat buildup. Dry thrust for the 141 was 108kN.

>Especially with something like PETA providing thrust, which has fewer moving parts and can be a load bearing structure member. Only downside is high fuel consumption and noise, but since it's only going to be active during landing and takeoff it's not really an issue.

Two whole jet engines is "fewer moving parts" than a power takeoff driving a fan? Okay then.
>> No. 21158 ID: 385f49
>>21157
>Two whole jet engines is "fewer moving parts" than a power takeoff driving a fan? Okay then.
With LM, you never know... >>21145
>> No. 21159 ID: 9723b1
>>21157
>"failed prototypes"
You're cute.

>That's afterburner thrust
>Dry thrust for the 141 was 108kN.
And the total is still 190kN, which is more than your 180kN value for F-35 which includes the fucking control jets. 190 is more than 180, and on a lighter jet.

>Two whole jet engines is "fewer moving parts" than a power takeoff driving a fan?
Yeah if they're pulsejet engines with <10 mobile (not always moving) parts.

>Okay then.
Okay then. Come back when you're informed.
>> No. 21160 ID: 9723b1
Actually I posted the PETA schematics and you still didn't know they were pulsejets, because you didn't even inform yourself on information I provided in the thread. So fuck you, don't ever come back.
>> No. 21161 ID: d4c8ee
>>21158
Rolls-Royce, not Lockheed.

>>21159
>>21160
>it doesn't matter that you can't use afterburner in VTOL because it would physically destroy the aircraft, it's still more powerful!
>they're pulsejets not turbojets no matter what the manufacturer says!

ITT: Boris gets triggered
>> No. 21162 ID: 30f399
File 146999362364.jpg - (191.29KB , 1600x1346 , Russian Yak-141 (NATO Freestyle) 1987 supersonic V.jpg )
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The Soviet Yak-141 (NATO designation Freestyle) 1987 supersonic VTOL fighter was used for testing the VTOL design.
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