BAKER LOAD TEST FAN DATA TABLES

Calculations by Joe Evans

Photo

^{_{One of our Tractor Club Members has a Baker Test Fan that we use to kill tractors with on a regular basis.  Being of the curious sort, we did a little research and math to correlate RPM to HP.  A Farmall Super M was used for the benchmark HP.  These figures apply only to our Baker Fan.  If you have access to a fan that has the same dimensions, then these figures are applicable for you.  Fan performance will vary with temperature, humidity, and altitude.}}

For a known fan RPM, find the HP required to achieve that RPM in TABLE 1.

For a known  tractor belt  HP rating, find the fan RPM that  tractor will achieve in TABLE 2.

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Revised 12/01/2003

TABLE 1

TABLE 2

hp₁ = (rpm₂/rpm₁)³ x hp₁

rpm₂ = (hp₂/hp₁ x rpm₁³)^1/3

Indicated Fan RPM

HP at Indicated Fan RPM

60

0.13

9

244

70

0.21

10

253

80

0.32

11

261

90

0.45

12

268

100

0.62

13

276

110

0.83

14

283

120

1.07

15

289

130

1.36

16

295

140

1.70

17

301

150

2.10

18

307

160

2.54

19

313

170

3.05

20

318

180

3.62

21

323

190

4.26

22

328

200

4.97

23

333

210

5.75

24

338

220

6.61

25

343

230

7.55

26

347

240

8.58

27

352

250

9.70

28

356

260

10.91

29

360

270

12.22

30

364

280

13.63

31

368

290

15.14

32

372

300

16.76

33

376

310

18.50

34

380

320

20.35

35

383

330

22.31

36

387

340

24.40

37

391

350

26.62

38

394

360

28.97

39

398

370

31.45

40

401

380

34.07

41

404

390

36.83

42

407

400

39.74

43

411

410

42.79

44

414

420

46.00

Super M

45

417

430

49.36

46

420

440

52.89

Old Oak Farmalls

47

423

450

56.58

48

426

460

60.43

49

429

470

64.46

50

432

480

68.66

51

435

490

73.05

52

438

500

77.61

53

440

510

82.36

54

443

520

87.30

55

446

530

92.44

56

448

540

97.77

57

451

550

103.30

58

454

560

109.04

59

456

570

114.98

60

459

580

121.14

61

461

590

127.52

62

464

600

134.11

63

466

610

140.93

64

469

620

147.97

65

471

630

155.25

66

474

640

162.76

67

476

650

170.51

68

478

660

178.50

69

481

670

186.74

70

483

680

195.23

71

485

690

203.97

72

488

700

212.96

73

490

710

222.22

74

492

720

231.74

75

494

730

241.53

76

497

740

251.60

77

499

750

261.94

78

501

760

272.55

79

503

770

283.45

80

505

780

294.64

81

507

790

306.12

82

509

800

317.89

83

511

810

329.96

84

513

820

342.34

85

515

830

355.01

86

517

840

368.00

87

850

381.30

88

521

860

394.92

89

523

870

408.85

90

525

880

423.11

91

527

890

437.70

92

529

900

452.62

93

531

920

483.47

94

533

940

515.70

95

535

960

549.32

96

537

980

584.37

97

539

1000

620.88

98

540

1500

2095.48

99

542

2000

4967.07

Old Oak Farmalls

100

544