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The Military-industrial Scientific Research System of the Academic Master Chapter 598
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The Military-industrial Scientific Research System of the Academic Master Chapter 598

Chapter 598 Is there ever a day when we can't fly big bricks?

As the test flight and transportation site of Shengfei Group, Beiling Airport is not large in scale. After all, there is no daily take-off and landing pressure here.

 Hence, within a few minutes, aircraft No. 1401 was already parked at the end of the takeoff runway, and the wings were readjusted to a 20° sweep angle that was more conducive to takeoff.

“The area has been cleared. Unit 1401 can take off.”

Fu Guoxiang put on an oxygen mask, maintained the brakes and slowly pushed the throttle valve, and watched as the engine tachometer pointer, which had been replaced by a Chinese style, slowly turned to the right.

 As a test pilot stationed at Field 112, this is his first time coming into contact with the turbofan 9A model.

 In fact, there are currently only three aircraft in the entire China - the 01 and 02 prototypes of the JH-7A, and the No. 1401 aircraft, which only uses the turbofan 9A.

However, the steady increase in speed still brings considerable confidence.

It even reminded him of the test flight of the J-8C after major changes two years ago.

 They are also two engines installed for the first time, and they also have such a stable speed.

Two new engines with considerable low-altitude and low-speed output have provided Fu Guoxiang with quite confident climbing capabilities. At least in his opinion, the current climb process is close to 70°, and there is almost no loss of speed.

Vigorously miracle.

 It was, of course, a representative from the Persian Air Force.

On the other hand, if the TF30 engine in the past dared to carry out such large-scale and violent maneuvers at low altitude, 80% of them would have entered a surge state...

Since there has been no formal means of importing spare parts for more than 20 years, in order to save the life of the machine, they rarely engage in such "wild" driving.

"of course."

 In his opinion, such an aircraft, which still has an empty weight of about 17.5 tons even after weight reduction, seems to be relatively clumsy.

“The climb rate shown this time is obviously higher than in the past..."

On the other side, this slightly wild action also caused a burst of exclamation in the command center of the tower.

After pulling up the plane, Fu Guoxiang retracted the landing gear, then allowed the plane to accumulate some speed, and then made his customary high-angle climb.

“We replaced the material of the skin part that does not involve the main load-bearing structure, reducing the empty weight by about 700kg. Moreover, the selevel thrust of the replaced turbofan 9A engine has increased by more than 17% compared with the past.”

“By doing this again and again, the thrust-to-weight ratio of the entire aircraft near takeoff can be increased by almost one-fifth, and the power performance is naturally completely different.”

Compared with the J-11 he had flown before, the F14's greater weight and drag made the acceleration capabilities of this model less optimistic and held it back slightly. However, the excellent lift coefficient still allowed this aircraft to use only Take-off conditions are reached at about one-tenth of the runway, which is about 350 meters away.

Almost at the same time as the throttle valve was pushed to the end, the two engines sprayed light blue tail flames with Mach rings downward in mid-air. The wings also adjusted to a higher resistance in less than 7 seconds. Low sweep angle state of 68° which is more suitable for acceleration.

He Ming already had a basic idea of ​​the performance of this aircraft, so his attention was not always focused on the aircraft outside. After hearing the Persian's evaluation, he immediately explained:

After the engine reached takeoff thrust and stabilized for a few seconds, Fu Guoxiang released the brakes and the plane began to roar and accelerate on the runway.

Fu Guoxiang himself was a little surprised by the pushing feeling coming from behind him.

A colonel standing next to the leading Persian general stared at it for a while, and then estimated.

After all, the F14 is a relatively mature design. After all, the "first flight" after modification is not exactly the same as the real first flight. The setting of flight subjects is much more open.

 Increasing the sweep angle will greatly reduce the lift coefficient provided by the wing, but...

 When He Ming said this, he even had a confused feeling——

The principle of making bricks fly with great force, one day I can tell it from my own mouth.

It's really magical. "in addition."

 He Ming's tone suddenly sounded a bit suffocating:

“I can assure you that the aircraft was filled with a standard amount of fuel before the test flight, and there was absolutely no situation where the engine was turned on in advance to consume fuel, thereby reducing the take-off weight.”

Hearing this sentence, even the Persian general laughed directly:

“Well, we have been watching you just now, and you really didn't do any tricks in this regard..."

The two of them were talking about what happened when Persia purchased US military fighter jets.

The candidates at the time were Grumman's F14 and McDonnell Douglas' F15.

Originally, the flight performance of the latter should be much better, but Grumman specifically asked McDonnell Douglas to perform the performance first, while its F14 kept running its engine on the ground to consume fuel, thus making up for the thrust-to-weight ratio to a certain extent. disadvantages.

Although the authenticity is virtually impossible to test, this story has become one of the famous urban legends in the field of international arms sales.

 After the brief joke, He Ming quickly returned to the topic:

“Getting back to the subject, in addition to the greater advantage of selevel thrust, we adopted blade separation flow active control technology in the design process of the turbofan 9A engine, which can cope with very extreme intake distortion.”

"Although the specific flight envelope data still needs to wait for our test pilots to fly out the results, from a qualitative point of view, the improved F14 can allow pilots to perform violent maneuvers that were unimaginable in the past, such as...you have already done it anyway Saw it.”

The F14A purchased by Persia is an earlier batch of technical versions. The selevel afterburning thrust of the engine is only 8,530kgf. However, the turbofan 9A, which has been partially improved by the turbofan 10 technology, has this data above 10,000kgf.

“Looking at it this way, the improved F14IC model can probably be equivalent to the level of the US military's F14D?”

 Obviously, the Persian Air Force has always been very concerned about the improvement of the Tomcats on the US military side.

"You can say that."

He Ming hesitated for a moment and then nodded:

“Although the selevel thrust of the turbofan 9A is smaller than that of the F110GE400 replaced by the F14D, the overall improvement ideas and the performance orientation of the improved model are similar.”

 Speaking of this, he suddenly remembered an interesting thing:

“Speaking of which, F110GE400 and Turbofan 9A, the total pressure ratio of these two engines happens to be 30.7, which is 50% higher than the TF30 engine.”

“Of course, as a price, the high-speed performance and maximum flight speed of the F14 after the engine change, whether our F14IC or the US military's F14D, have actually been reduced.”

"oh?"

The Persian general who had been holding a telescope was also attracted by this topic about engines:

“Did you consider benchmarking against the F110 when designing?”

In fact, the reason why they decided to hand over the F14 to China for modification was partly because the size, weight and performance of the 1493 radar could perfectly replace the AWG9, and the other half was because they discovered the turbofan when visiting the Haofei Group. The performance of the 9A engine is quite good.

 “That's not the case.”

He Ming shook his head:

“This is a complete coincidence. In fact, the turbofan 9A is a by-product created by one of our chief designers for technical verification. It is impossible to specifically focus on benchmarking other models in terms of total pressure ratio.”

This answer was originally just that he told the truth without any deep meaning, but the effect was surprisingly good.

“Wait, you mean, the by-product... already has such good performance?”

Now that No. 1401 has flown far away, it is impossible to see it even with a telescope, so the Persian general simply put it aside, turned around and asked with a shocked face.

He Mingxin on the opposite side said that it was because you didn't know what kind of hard work Mr. Chang was preparing to do on the Turbofan 10, but the contents of the third-generation (actually 3.75-generation) turbofan engine were all confidential, so he had to change to a more traditional one. Answer:

“Although it is a by-product, the technologies used on it are the latest cutting-edge technologies from the 1990s and even into the next century.”

“It can be said that although the turbofan 9A was born out of the British Spey, it has no direct relationship with Spey now..."

 (End of this chapter)

Chapter end

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Chapter 690
Chapter 689
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Chapter 684
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Chapter 682
Chapter 681
Chapter 680
Chapter 679
Chapter 678
Chapter 677
Chapter 676
Chapter 675
Chapter 674
Chapter 673
Chapter 672
Chapter 671
Chapter 670
Chapter 669
Chapter 668
Chapter 667
Chapter 666
Chapter 665
Chapter 664
Chapter 663
Chapter 662
Chapter 661
Chapter 660
Chapter 659
Chapter 658
Chapter 657
Chapter 656
Chapter 655
Chapter 654
Chapter 653
Chapter 652
Chapter 651
Chapter 650
Chapter 649
Chapter 648
Chapter 647
Chapter 646
Chapter 645
Chapter 644
Chapter 643
Chapter 642
Chapter 641
Chapter 640
Chapter 639
Chapter 638
Chapter 637
Chapter 636
Chapter 635
Chapter 634
Chapter 633
Chapter 632
Chapter 631
Chapter 630
Chapter 629
Chapter 628
Chapter 627
Chapter 626
Chapter 625
Chapter 624
Chapter 623
Chapter 622
Chapter 621
Chapter 620
Chapter 619
Chapter 618
Chapter 617
Chapter 616
Chapter 615
Chapter 614
Chapter 613
Chapter 612
Chapter 611
Chapter 610
Chapter 609
Chapter 608
Chapter 607
Chapter 606
Chapter 605
Chapter 604
Chapter 603
Chapter 602
Chapter 601
Chapter 600
Chapter 599
Chapter 598
Chapter 597
Chapter 596
Chapter 595
Chapter 594
Chapter 593
Chapter 592
Chapter 591
Chapter 590
Chapter 589
Chapter 588
Chapter 587
Chapter 586
Chapter 585
Chapter 584
Chapter 583
Chapter 582
Chapter 581
Chapter 580
Chapter 579
Chapter 578
Chapter 577
Chapter 576
Chapter 575
Chapter 574
Chapter 573
Chapter 572
Chapter 571
Chapter 570
Chapter 569
Chapter 568
Chapter 567
Chapter 566
Chapter 565
Chapter 564
Chapter 563
Chapter 562
Chapter 561
Chapter 560
Chapter 559
Chapter 558
Chapter 557
Chapter 556
Chapter 555
Chapter 554
Chapter 553
Chapter 552
Chapter 551
Chapter 550
Chapter 549
Chapter 548
Chapter 547
Chapter 546
Chapter 545
Chapter 544
Chapter 543
Chapter 542
Chapter 541
Chapter 540
Chapter 539
Chapter 538
Chapter 537
Chapter 536
Chapter 535
Chapter 534
Chapter 533
Chapter 532
Chapter 531
Chapter 530
Chapter 529
Chapter 528
Chapter 527
Chapter 526
Chapter 525
Chapter 524
Chapter 523
Chapter 522
Chapter 521
Chapter 520
Chapter 519
Chapter 518
Chapter 517
Chapter 516
Chapter 515
Chapter 514
Chapter 513
Chapter 512
Chapter 511
Chapter 510
Chapter 509
Chapter 508
Chapter 507
Chapter 506
Chapter 505
Chapter 504
Chapter 503
Chapter 502
Chapter 501
Chapter 500
Chapter 499
Chapter 498
Chapter 497
Chapter 496
Chapter 495
Chapter 494
Chapter 493
Chapter 492
Chapter 491
Chapter 490
Chapter 489
Chapter 488
Chapter 487
Chapter 486
Chapter 485
Chapter 484
Chapter 483
Chapter 482
Chapter 481
Chapter 480
Chapter 479
Chapter 478
Chapter 477
Chapter 476
Chapter 475
Chapter 474
Chapter 473
Chapter 472
Chapter 471
Chapter 470
Chapter 469
Chapter 468
Chapter 467
Chapter 466
Chapter 465
Chapter 464
Chapter 463
Chapter 462
Chapter 461
Chapter 460
Chapter 459
Chapter 458
Chapter 457
Chapter 456
Chapter 455
Chapter 454
Chapter 453
Chapter 452
Chapter 451
Chapter 450
Chapter 449
Chapter 448
Chapter 447
Chapter 446
Chapter 445
Chapter 444
Chapter 443
Chapter 442
Chapter 441
Chapter 440
Chapter 439
Chapter 438
Chapter 437
Chapter 436
Chapter 435
Chapter 434
Chapter 433
Chapter 432
Chapter 431
Chapter 430
Chapter 429
Chapter 428
Chapter 427
Chapter 426
Chapter 425
Chapter 424
Chapter 423
Chapter 422
Chapter 421
Chapter 420
Chapter 419
Chapter 418
Chapter 417
Chapter 416
Chapter 415
Chapter 414
Chapter 413
Chapter 412
Chapter 411
Chapter 410
Chapter 409
Chapter 408
Chapter 407
Chapter 406
Chapter 405
Chapter 404
Chapter 403
Chapter 402
Chapter 401
Chapter 400
Chapter 399
Chapter 398
Chapter 397
Chapter 396
Chapter 395
Chapter 394
Chapter 393
Chapter 392
Chapter 391
Chapter 390
Chapter 389
Chapter 388
Chapter 387
Chapter 386
Chapter 385
Chapter 384
Chapter 383
Chapter 382
Chapter 381
Chapter 380
Chapter 379
Chapter 378
Chapter 377
Chapter 376
Chapter 375
Chapter 374
Chapter 373
Chapter 372
Chapter 371
Chapter 370
Chapter 369
Chapter 368
Chapter 367
Chapter 366
Chapter 365
Chapter 364
Chapter 363
Chapter 362
Chapter 361
Chapter 360
Chapter 359
Chapter 358
Chapter 357
Chapter 356
Chapter 355
Chapter 354
Chapter 353
Chapter 352
Chapter 351
Chapter 350
Chapter 349
Chapter 348
Chapter 347
Chapter 346
Chapter 345
Chapter 344
Chapter 343
Chapter 342
Chapter 341
Chapter 340
Chapter 339
Chapter 338
Chapter 337
Chapter 336
Chapter 335
Chapter 334
Chapter 333
Chapter 332
Chapter 331
Chapter 330
Chapter 329
Chapter 328
Chapter 327
Chapter 326
Chapter 325
Chapter 324
Chapter 323
Chapter 322
Chapter 321
Chapter 320
Chapter 319
Chapter 318
Chapter 317
Chapter 316
Chapter 315
Chapter 314
Chapter 313
Chapter 312
Chapter 311
Chapter 310
Chapter 309
Chapter 308
Chapter 307
Chapter 306
Chapter 305
Chapter 304
Chapter 303
Chapter 302
Chapter 301
Chapter 300
Chapter 299
Chapter 298
Chapter 297
Chapter 296
Chapter 295
Chapter 294
Chapter 293
Chapter 292
Chapter 291
Chapter 290
Chapter 289
Chapter 288
Chapter 287
Chapter 286
Chapter 285
Chapter 284
Chapter 283
Chapter 282
Chapter 281
Chapter 280
Chapter 279
Chapter 278
Chapter 277
Chapter 276
Chapter 275
Chapter 274
Chapter 273
Chapter 272
Chapter 271
Chapter 270
Chapter 269
Chapter 268
Chapter 267
Chapter 266
Chapter 265
Chapter 264
Chapter 263
Chapter 262
Chapter 261
Chapter 260
Chapter 259
Chapter 258
Chapter 257
Chapter 256
Chapter 255
Chapter 254
Chapter 253
Chapter 252
Chapter 251
Chapter 250
Chapter 249
Chapter 248
Chapter 247
Chapter 246
Chapter 245
Chapter 244
Chapter 243
Chapter 242
Chapter 241
Chapter 240
Chapter 239
Chapter 238
Chapter 237
Chapter 236
Chapter 235
Chapter 234
Chapter 233
Chapter 232
Chapter 231
Chapter 230
Chapter 229
Chapter 228
Chapter 227
Chapter 226
Chapter 225
Chapter 224
Chapter 223
Chapter 222
Chapter 221
Chapter 220
Chapter 219
Chapter 218
Chapter 217
Chapter 216
Chapter 215
Chapter 214
Chapter 213
Chapter 212
Chapter 211
Chapter 210
Chapter 209
Chapter 208
Chapter 207
Chapter 206
Chapter 205
Chapter 204
Chapter 203
Chapter 202
Chapter 201
Chapter 200
Chapter 199
Chapter 198
Chapter 197
Chapter 196
Chapter 195
Chapter 194
Chapter 193
Chapter 192
Chapter 191
Chapter 190
Chapter 189
Chapter 188
Chapter 187
Chapter 186
Chapter 185
Chapter 184
Chapter 183
Chapter 182
Chapter 181
Chapter 180
Chapter 179
Chapter 178
Chapter 177
Chapter 176
Chapter 175
Chapter 174
Chapter 173
Chapter 172
Chapter 171
Chapter 170
Chapter 169
Chapter 168
Chapter 167
Chapter 166
Chapter 165
Chapter 164
Chapter 163
Chapter 162
Chapter 161
Chapter 160
Chapter 159
Chapter 158
Chapter 157
Chapter 156
Chapter 155
Chapter 154
Chapter 153
Chapter 152
Chapter 151
Chapter 150
Chapter 149
Chapter 148
Chapter 147
Chapter 146
Chapter 145
Chapter 144
Chapter 143
Chapter 142
Chapter 141
Chapter 140
Chapter 139
Chapter 138
Chapter 137
Chapter 136
Chapter 135
Chapter 134
Chapter 133
Chapter 132
Chapter 131
Chapter 130
Chapter 129
Chapter 128
Chapter 127
Chapter 126
Chapter 125
Chapter 124
Chapter 123
Chapter 122
Chapter 121
Chapter 120
Chapter 119
Chapter 118
Chapter 117
Chapter 116
Chapter 115
Chapter 114
Chapter 113
Chapter 112
Chapter 111
Chapter 110
Chapter 109
Chapter 108
Chapter 107
Chapter 106
Chapter 105
Chapter 104
Chapter 103
Chapter 102
Chapter 101
Chapter 100
Chapter 99
Chapter 98
Chapter 97
Chapter 96
Chapter 95
Chapter 94
Chapter 93
Chapter 92
Chapter 91
Chapter 90
Chapter 89
Chapter 88
Chapter 87
Chapter 86
Chapter 85
Chapter 84
Chapter 83
Chapter 82
Chapter 81
Chapter 80
Chapter 79
Chapter 78
Chapter 77
Chapter 76
Chapter 75
Chapter 74
Chapter 73
Chapter 72
Chapter 71
Chapter 70
Chapter 69
Chapter 68
Chapter 67
Chapter 66
Chapter 65
Chapter 64
Chapter 63
Chapter 62
Chapter 61
Chapter 60
Chapter 59
Chapter 58
Chapter 57
Chapter 56
Chapter 55
Chapter 54
Chapter 53
Chapter 52
Chapter 51
Chapter 50
Chapter 49
Chapter 48
Chapter 47
Chapter 46
Chapter 45
Chapter 44
Chapter 43
Chapter 42
Chapter 41
Chapter 40
Chapter 39
Chapter 38
Chapter 37
Chapter 36
Chapter 35
Chapter 34
Chapter 33
Chapter 32
Chapter 31
Chapter 30
Chapter 29
Chapter 28
Chapter 27
Chapter 26
Chapter 25
Chapter 24
Chapter 23
Chapter 22
Chapter 21
Chapter 20
Chapter 19
Chapter 18
Chapter 17
Chapter 16
Chapter 15
Chapter 14
Chapter 13
Chapter 12
Chapter 11
Chapter 10
Chapter 9
Chapter 8
Chapter 7
Chapter 6
Chapter 5
Chapter 4
Chapter 3
Chapter 2
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