Muhtasari
MAD X4229 ni motor ya drone ya ndege eVTOL iliyoundwa kwa ajili ya propulsion yenye ufanisi wa juu. Motors za shingo ndefu zinaweza kutumika kuendesha propela za pusher (motor iko katikati ya fuselage, ikituma nguvu kupitia akseli hadi boom ya mkia).
Vipengele Muhimu
- Ufanisi wa nishati (230KV: ufanisi >81%; 420KV: ufanisi >80%).
- Thrust inayopendekezwa ya kuanguka: 2.5~4.0 kgf (230KV na 420KV).
- Uzito ulioimarishwa: 397 g (230KV na 420KV).
- ESC inayopendekezwa: MAD AMPX 80A (5-14S) (230KV na 420KV).
Kwa msaada wa uchaguzi na usaidizi wa uunganisho, wasiliana na https://rcdrone.top/.
Maelezo ya Kiufundi
MAD X4229 IPE 230KV (Toleo la Wataalamu wa Sekta)
- Thrust inayopendekezwa ya kuanguka: 2.5~4.0 kgf
- Thrust ya juu zaidi: 8.3 kgf
- Uzito ulioimarishwa: 397 g
- Ufanisi: >81%
Data za Motor (230KV)
| Mfano wa Motor | MAD X4229 IPE V1.0 | Idadi ya jozi za nguzo | 7 |
| Stator | TAIWAN / Anti-ukungu | Wire ya Varnished Kiwango | 180°C |
| Ukubwa wa Motor | D:50 × 78.3 mm | Kiwango cha Magnet | 150°C |
| Kiwango cha Ulinzi | IP35 | Urefu wa Kebuli | 110 mm 14# Awg(Black) silicone |
| Kuondoa Joto kwa Centrifugal | NDIYO | Usawa wa Rotor | ≤5 mg |
| Shimo za Kuweka Propeller | D:20 M3×4 / M8 Nut | Usawa wa Motor | ≤10 mg |
| Nyenzo ya Shat | ND: 6 mm | Shimo za Kuweka Motor | D:30 M4×4, D:56 M4×4, D:60 M4×4 |
| Mpira | EZO 686ZZ*2 / EZO 696ZZ | Jaribio la Kuvuruga | 500 V |
| Vifaa vya Ziada | Plate ya Propeller*1, Adaptari ya Prop*1, X-Mount*1, 4.0mm Bullet Connector*3, Heat Shrinkable Tube*3, M4*10mm*4 Motor Screws, M3*8mm*4 Prop Adapter Screws, M4*10mm*4 X-Mount Installation Screw, M8 Nut Propeller Screws, Sticker*2 | ||
Specs za Umeme/Utendaji (230KV)
| RPM/V | 230 KV | Voltage ya Kawaida | 12S betri ya lipo |
| Current Bila Load | 1.2A/25V | Upinzani wa ndani | 42.5mΩ |
| Uzito wa Motor | 397 g | Uzito wa Bidhaa Iliyofungwa | 649g (110 x 110 x 95 mm) |
| Current Kuu | 53.4 A | Nguvu Kuu | 2323W |
| Thrust Kuu | 8.3 kg | Torque Kuu | 2.1 Nm |
| ESC Inayopendekezwa | MAD AMPX 80A (5-14S) | Propela Inayopendekezwa | 16x8, 17x10, 18x8 |
| Uzito wa UAV wakati wa kupaa | 6S-18"/ 12kg--Quadcopter; 18kg--Hexacopter; 24kg--Octocopter | Uzito wa rotor mmoja wakati wa kupaa | 2.5kg ~ 4kg |
Leibha za Mchoro wa Dimensional (230KV)
- Urefu wa jumla: 78.3
- Urefu wa mwili: 54.5; Upanuzi: 22
- Upana wa motor: Ø50
- Kuweka propela: Ø20-M3×4
- Leibha ya mpangilio wa kufunga: Ø30-M4×4
- Vipimo/mashtaka mengine vilivyotambulishwa: 4-Ø6, 4-Ø3.2, Ø20, M8 P1mm, M4, Ø11, Ø4.1, Ø60, Ø58, 4-Ø7.8, 4-Ø4.2, Ø15, Ø70, 4
Grafu ya Uchambuzi wa Uendeshaji wa Motor (230KV)
I = Mvuto, P = Nguvu ya Kuingiza, η = Ufanisi wa Umeme, T = Mvutano, N = Kasi ya Kugeuza.Data iliyoandikwa kwa voltage ya ingizo ya 48 V, katika joto la 25°C na kiwango cha baharini. Kasi ya kuzunguka ilirekebishwa kwa throttle.
Data ya Jaribio (230KV, 12S) — MAD X4229 IPE 230KV + MAD AMPX 80A (5-14S)
APC 16x8 (MAX 91°C)
| Throttle (%) | Voltage (V) | Current (A) | Input Power (W) | Output Power (W) | Torque (N·m) | RPM | Thrust (gf) | Efficiency (%) | Efficiency (gf/W) |
|---|---|---|---|---|---|---|---|---|---|
| 30 | 44.62 | 1.46 | 65.1 | 43.7 | 0.143 | 2920 | 671 | 67.1 | 10.3 |
| 35 | 44.58 | 2.17 | 96.7 | 70.5 | 0.196 | 3434 | 926 | 72.9 | 9.6 |
| 40 | 44.58 | 2.98 | 132.8 | 102.2 | 0.254 | 3844 | 1189 | 77 | 9.0 |
| 45 | 44.56 | 3.88 | 172.9 | 136.0 | 0.306 | 4245 | 1444 | 78.7 | 8.4 |
| 50 | 44.53 | 5.28 | 235.1 | 189.9 | 0.385 | 4710 | 1811 | 80.8 | 7.7 |
| 55 | 44.5 | 7.13 | 317.3 | 261.6 | 0.478 | 5226 | 2227 | 82.4 | 7.0 |
| 60 | 44.46 | 9.09 | 404.1 | 337.6 | 0.568 | 5676 | 2633 | 83.5 | 6.5 |
| 65 | 44.4 | 11.34 | 503.5 | 424.5 | 0.666 | 6086 | 3070 | 84.3 | 6.1 |
| 70 | 44.34 | 14.02 | 621.6 | 530.8 | 0.786 | 6449 | 3558 | 85.4 | 5.7 |
| 75 | 44.29 | 16.98 | 752.0 | 644.2 | 0.901 | 6828 | 4022 | 85.7 | 5.3 |
| 80 | 44.22 | 20.2 | 893.2 | 764.6 | 1.010 | 7229 | 4495 | 85.6 | 5.0 |
| 85 | 44.14 | 23.97 | 1058.0 | 901.7 | 1.133 | 7600 | 4922 | 85.2 | 4.7 |
| 90 | 44.04 | 28.58 | 1258.7 | 1071.2 | 1.284 | 7967 | 5480 | 85.1 | 4.4 |
| 95 | 43.93 | 33.78 | 1484.0 | 1253.5 | 1.441 | 8307 | 5739 | 84.5 | 3.9 |
| 100 | 43.79 | 40.01 | 1752.0 | 1471.4 | 1.630 | 8620 | 6234 | 84 | 3.6 |
APC 17x10 (MAX 103°C)
| Throttle (%) | Voltage (V) | Current (A) | Input Power (W) | Output Power (W) | Torque (N·m) | RPM | Thrust (gf) | Efficiency (%) | Efficiency (gf/W) |
|---|---|---|---|---|---|---|---|---|---|
| 30 | 44.6 | 2.02 | 90.1 | 64.9 | 0.218 | 2841 | 909 | 72 | 10.1 |
| 35 | 44.57 | 3.11 | 138.6 | 105.8 | 0.302 | 3345 | 1276 | 76.3 | 9.2 |
| 40 | 44.56 | 4.26 | 189.8 | 149.2 | 0.380 | 3750 | 1589 | 78.6 | 8.4 |
| 45 | 44.52 | 5.61 | 249.8 | 201.2 | 0.465 | 4131 | 1932 | 80.5 | 7.7 |
| 50 | 44.48 | 7.54 | 335.4 | 275.9 | 0.578 | 4559 | 2364 | 82.3 | 7.0 |
| 55 | 44.43 | 10.28 | 456.7 | 379.2 | 0.721 | 5022 | 2963 | 83 | 6.5 |
| 60 | 44.37 | 12.98 | 575.9 | 480.2 | 0.841 | 5452 | 3444 | 83.4 | 6.0 |
| 65 | 44.32 | 15.8 | 700.3 | 580.9 | 0.952 | 5827 | 3887 | 83 | 5.6 |
| 70 | 44.24 | 19.16 | 847.6 | 703.2 | 1.088 | 6172 | 4386 | 83 | 5.2 |
| 75 | 44.16 | 23.08 | 1019.2 | 848.0 | 1.242 | 6520 | 4933 | 83.2 | 4.8 |
| 80 | 44.07 | 27.21 | 1199.1 | 990.1 | 1.375 | 6876 | 5351 | 82.6 | 4.5 |
| 85 | 43.95 | 32.72 | 1438.0 | 1178.3 | 1.570 | 7167 | 5722 | 81.9 | 4.0 |
| 90 | 43.82 | 39.06 | 1711.6 | 1380.1 | 1.761 | 7484 | 6007 | 80.6 | 3.5 |
| 95 | 43.68 | 45.67 | 1994.9 | 1588.9 | 1.949 | 7785 | 6527 | 79.6 | 3.3 |
| 100 | 43.51 | 53.39 | 2323.0 | 1817.4 | 2.149 | 8076 | 7035 | 78.2 | 3.0 |
APC 18x8 (MAX 121°C)
| Throttle (%) | Voltage (V) | Current (A) | Input Power (W) | Output Power (W) | Torque (N·m) | RPM | Thrust (gf) | Efficiency (%) | Efficiency (gf/W) |
|---|---|---|---|---|---|---|---|---|---|
| 30 | 44.6 | 1.96 | 87.4 | 62.5 | 0.210 | 2840 | 948 | 71.5 | 10.8 |
| 35 | 44.58 | 2.99 | 133.3 | 102.3 | 0.292 | 3347 | 1326 | 76.7 | 10.0 |
| 40 | 44.57 | 4.1 | 182.7 | 145.3 | 0.370 | 3749 | 1689 | 79.5 | 9.2 |
| 45 | 44.53 | 5.41 | 240.9 | 195.1 | 0.451 | 4130 | 2060 | 81 | 8.6 |
| 50 | 44.5 | 7.28 | 324.0 | 268.5 | 0.561 | 4570 | 2542 | 82.9 | 7.8 |
| 55 | 44.44 | 9.9 | 440.0 | 367.7 | 0.696 | 5045 | 3157 | 83.6 | 7.2 |
| 60 | 44.38 | 12.69 | 563.2 | 475.4 | 0.830 | 5470 | 3719 | 84.4 | 6.6 |
| 65 | 44.31 | 15.79 | 699.7 | 593.3 | 0.972 | 5829 | 4310 | 84.8 | 6.2 |
| 70 | 44.23 | 19.11 | 845.2 | 715.3 | 1.105 | 6180 | 4898 | 84.6 | 5.8 |
| 75 | 44.16 | 22.75 | 1004.6 | 845.3 | 1.235 | 6536 | 5452 | 84.1 | 5.4 |
| 80 | 44.06 | 26.9 | 1185.2 | 991.9 | 1.374 | 6894 | 5996 | 83.7 | 5.1 |
| 85 | 43.98 | 31.24 | 1373.9 | 1137.9 | 1.499 | 7249 | 6517 | 82.8 | 4.7 |
| 90 | 43.87 | 36.67 | 1608.7 | 1325.2 | 1.668 | 7587 | 7172 | 82.4 | 4.5 |
| 95 | 43.72 | 43.33 | 1894.4 | 1539. | 1.865 | 7882 | 7951 | 81.6 | 4.2 |
| 100 | 43.57 | 50.47 | 2199.0 | 1755.6 | 2.050 | 8178 | 8257 | 79.8 | 3.8 |
Data zilizo hapo juu ni thamani za nadharia wakati voltage ya kuingiza ni 48V, kwa ajili ya rejeleo tu. Katika hali ya joto la chumba la 25°C na hakuna kifaa kingine cha kupoza, sasa zaidi ya 50A ni eneo lisilofanya kazi, 16-50A ni muda mfupi (takriban 10-30s), eneo la kufanya kazi, na chini ya 16A ni eneo la kufanya kazi endelevu. Katika matumizi halisi, tafadhali dhibiti muda wa kufanya kazi wa motor kulingana na joto la mazingira ya kufanya kazi na hali za kutolea joto.
MAD X4229 IPE 420KV (Toleo la Kitaalamu la Viwanda)
- Mapendekezo ya nguvu ya kuzunguka: 2.5~4.0 kgf
- Nguvu ya juu zaidi: 7.8 kgf
- Uzito ulioimarishwa: 397 g
- Ufanisi: >80%
Vipimo vya Umeme/Utendaji (420KV)
| RPM/V | 420 KV | Voltage ya Kawaida | Betri ya lipo 6S |
| Mzigo wa Sasa | 2.3A/20V | Upinzani wa ndani | 13.7mΩ |
| Uzito wa Motor | 397 g | Uzito wa Kifurushi cha Bidhaa | 649g (110 x 110 x 95 mm) |
| Sasa ya Juu | 85.9 A | Nguvu ya Juu | 2049W |
| Upeo wa nguvu | 7.8 kg | Upeo wa Torque | 1.9 Nm |
| ESC Inayopendekezwa | MAD AMPX 80A (5-14S) | Propela Zinazopendekezwa | 17x10, 18x8 |
| Uzito wa kuanzia UAV | 6S-18"/ 12kg--Quadcopter; 18kg--Hexacopter; 24kg--Octocopter | Uzito wa kuanzia rotor mmoja | 2.5kg ~ 4kg |
Grafu ya Uchambuzi wa Uendeshaji wa Motor (420KV)
I = Mvuto, P = Nguvu ya Kuingiza, η = Ufanisi wa Umeme, T = Nguvu ya Kusukuma, N = Kasi ya Kugeuka. Takwimu zilipimwa kwa voltage ya kuingiza ya 24 V, kwa joto la 25°C na kiwango cha baharini. Kasi ya kugeuka ilirekebishwa kwa throttle.
Data ya Jaribio (420KV, 6S) — MAD X4229 IPE 420KV + MAD AMPX 80A (5-14S)
APC 16x8 (MAX 99°C)
| Throttle (%) | Voltage (V) | Current (A) | Input Power (W) | Output Power (W) | Torque (N·m) | RPM | Thrust (gf) | Efficiency (%) | Efficiency (gf/W) |
|---|---|---|---|---|---|---|---|---|---|
| 30 | 25.46 | 3 | 76.3 | 46.2 | 0.147 | 2994 | 644 | 61.83 | 8.6 |
| 35 | 25.45 | 4.17 | 106.1 | 70.1 | 0.197 | 3407 | 875 | 67.44 | 8.4 |
| 40 | 25.39 | 5.96 | 151.3 | 110.0 | 0.268 | 3917 | 1218 | 73.94 | 8.2 |
| 45 | 25.34 | 7.9 | 200.2 | 153.6 | 0.338 | 4339 | 1566 | 77.89 | 7.9 |
| 50 | 25.31 | 9.98 | 252.6 | 198.5 | 0.402 | 4715 | 1858 | 79.6 | 7.5 |
| 55 | 25.3 | 12.56 | 317.7 | 254.2 | 0.477 | 5086 | 2197 | 80.98 | 7.0 |
| 60 | 25.24 | 16.15 | 407.5 | 330.9 | 0.570 | 5542 | 2604 | 81.99 | 6.5 |
| 65 | 25.07 | 20.3 | 509.0 | 418.2 | 0.670 | 5964 | 3030 | 82.41 | 6.0 |
| 70 | 25.05 | 25.12 | 629.4 | 516.3 | 0.775 | 6362 | 3495 | 83 | 5.6 |
| 75 | 25 | 30.43 | 760.7 | 619.5 | 0.881 | 6713 | 3937 | 82.39 | 5.2 |
| 80 | 24.88 | 35.67 | 887.3 | 723.1 | 0.981 | 7036 | 4344 | 84.49 | 5.1 |
| 85 | 24.79 | 41.47 | 1028.2 | 834.9 | 1.085 | 7348 | 4763 | 83.87 | 4.8 |
| 90 | 24.6 | 48.37 | 1189.9 | 962.4 | 1.202 | 7645 | 5208 | 82.89 | 4.5 |
| 95 | 24.54 | 55.81 | 1369.3 | 1095.4 | 1.319 | 7930 | 5644 | 81.77 | 4.2 |
| 100 | 24.26 | 66.57 | 1615.3 | 1278.6 | 1.475 | 8279 | 6182 | 80 | 3.9 |
APC 17x10 (MAX 108°C)
| Throttle (%) | Voltage (V) | Current (A) | Input Power (W) | Output Power (W) | Torque (N·m) | RPM | Thrust (gf) | Efficiency (%) | Efficiency (gf/W) |
|---|---|---|---|---|---|---|---|---|---|
| 30 | 25.46 | 3.91 | 99.4 | 67.6 | 0.224 | 2882 | 831 | 69.37 | 8.5 |
| 35 | 25.43 | 5.45 | 138.5 | 100.1 | 0.292 | 3278 | 1127 | 73.71 | 8.3 |
| 40 | 25.38 | 8 | 203.0 | 156.4 | 0.397 | 3766 | 1597 | 78.28 | 8.0 |
| 45 | 25.33 | 10.92 | 276.7 | 217.4 | 0.495 | 4195 | 2013 | 79.73 | 7.4 |
| 50 | 25.29 | 13.93 | 352.2 | 281.5 | 0.591 | 4549 | 2398 | 80.86 | 6.9 |
| 55 | 25.21 | 17.56 | 442.8 | 355.3 | 0.692 | 4905 | 2810 | 80.97 | 6.4 |
| 60 | 25.13 | 22.23 | 558.5 | 450.7 | 0.813 | 5295 | 3281 | 81.11 | 5.9 |
| 65 | 24.94 | 27.8 | 693.2 | 561.3 | 0.949 | 5647 | 3806 | 83.6 | 5.7 |
| 70 | 24.91 | 33.59 | 836.8 | 673.1 | 1.070 | 6005 | 4264 | 83.51 | 5.3 |
| 75 | 24.79 | 40.36 | 1000.5 | 798.8 | 1.206 | 6324 | 4791 | 82.45 | 4.9 |
| 80 | 24.68 | 47.1 | 1162.4 | 919.3 | 1.328 | 6613 | 5209 | 81.32 | 4.6 |
| 85 | 24.53 | 54.32 | 1332.4 | 1041.9 | 1.448 | 6872 | 5631 | 79.89 | 4.3 |
| 90 | 24.35 | 63.11 | 1536.8 | 1187.7 | 1.599 | 7094 | 5945 | 78.39 | 3.9 |
| 95 | 24.18 | 72.5 | 1753.1 | 1332.6 | 1.742 | 7304 | 6154 | 76.56 | 3.5 |
| 100 | 23.92 | 85.65 | 2048.8 | 1534.6 | 1.934 | 7577 | 6411 | 77.9 | 3.3 |
APC 18x8 (MAX 118°C)
| Throttle (%) | Voltage (V) | Current (A) | Input Power (W) | Output Power (W) | Torque (N·m) | RPM | Thrust (gf) | Efficiency (%) | Efficiency (gf/W) |
|---|---|---|---|---|---|---|---|---|---|
| 30 | 25.47 | 3.89 | 99.0 | 67.2 | 0.222 | 2892 | 966 | 69.31 | 10.0 |
| 35 | 25.44 | 5.41 | 137.6 | 99.5 | 0.289 | 3284 | 1275 | 73.75 | 9.5 |
| 40 | 25.39 | 7.84 | 199.1 | 152.6 | 0.386 | 3775 | 1710 | 77.95 | 8.7 |
| 45 | 25.34 | 10.77 | 272.9 | 214.7 | 0.488 | 4204 | 2173 | 79.83 | 8.1 |
| 50 | 25.29 | 13.66 | 345.5 | 275.8 | 0.577 | 4565 | 2514 | 80.81 | 7.4 |
| 55 | 25.23 | 17.18 | 433.4 | 348.0 | 0.675 | 4924 | 2977 | 81.05 | 6.9 |
| 60 | 25.15 | 21.79 | 548.2 | 442.9 | 0.796 | 5313 | 3503 | 81.31 | 6.4 |
| 65 | 25.05 | 27.05 | 677.4 | 549.0 | 0.923 | 5680 | 4044 | 81.19 | 6.0 |
| 70 | 24.94 | 33.01 | 823.0 | 663.3 | 1.049 | 6038 | 4566 | 83.74 | 5.8 |
| 75 | 24.8 | 39.72 | 985.1 | 790.1 | 1.186 | 6359 | 5148 | 82.86 | 5.4 |
| 80 | 24.69 | 46.34 | 1144.2 | 910.3 | 1.308 | 6646 | 5624 | 81.84 | 5.1 |
| 85 | 24.57 | 53.46 | 1313.8 | 1031.6 | 1.425 | 6913 | 6103 | 80.38 | 4.8 |
| 90 | 24.41 | 61.32 | 1496.9 | 1165.2 | 1.553 | 7166 | 6644 | 79.16 | 4.5 |
| 95 | 24.25 | 69.93 | 1695.7 | 1300.1 | 1.676 | 7406 | 7141 | 77.45 | 4.3 |
| 100 | 23.99 | 82.16 | 1971.1 | 1488.6 | 1.845 | 7704 | 7757 | 77.61 | 4.0 |
Data zilizo hapo juu ni thamani za nadharia wakati voltage ya kuingiza ni 24V, kwa ajili ya rejeleo tu. Katika hali ya joto la chumba la 25°C na hakuna kifaa kingine cha kupoza, sasa zaidi ya 82A ni eneo lisilofanya kazi, 27-82A ni eneo la muda mfupi (takriban sekunde 10-30), na chini ya 27A ni eneo la kufanya kazi endelevu. Katika matumizi halisi, tafadhali dhibiti muda wa kuendesha motor kulingana na joto la mazingira ya kazi na hali za kutolea joto.
Nini Kimejumuishwa
- Jukwaa la Propeller*1
- Adapter ya Prop*1
- X-Mount*1
- 4.0mm Bullet Connector*3
- Tube ya Kupunguza Joto*3
- M4*10mm*4 Screws za Motor
- M3*8mm*4 Screws za Prop Adapter
- M4*10mm*4 Screw za Usanidi wa X-Mount
- M8 Nut Screws za Propeller
- Sticker*2
Maombi
- ndege za eVTOL na majukwaa ya VTOL yenye mabawa yasiyohamishika (ikiwemo mipangilio ya pusher yenye uhamishaji wa akseli)
- Mipangilio ya kuinua ya rotor moja (uzito wa kutua wa rotor moja: 2.5kg ~ 4kg)
- Majukwaa ya UAV yenye rotor nyingi (6S-18"/ 12kg--Quadcopter; 18kg--Hexacopter; 24kg--Octocopter)
Maelezo

Motor ya MAD X4229 230KV ina kiwango cha 12S na inataja uzito wa 397g, ufanisi wa zaidi ya 81%, na hadi 8.3 kgf nguvu ya juu.

Karatasi ya spesifiki za motor ya MAD X4229 inaorodhesha vipimo muhimu kama 230KV na shat 6mm, pamoja na vipimo vya kina vya usakinishaji kwa kupanga muundo wa ndege yako.

Jedwali la majaribio ya motor ya MAD X4229 IPE 230KV linaorodhesha data za throttle za 12S ikiwa ni pamoja na RPM, nguvu, matumizi ya sasa, na ufanisi na propela za APC 16x8, 17x10, na 18x8.

Motor ya MAD X4229 420KV eVTOL ina uzito wa 397 g na nguvu inayofikia hadi 7.8 kg na ufanisi unaoonekana zaidi ya 80%.

Data za majaribio ya motor ya MAD X4229 IPE 420KV zinaorodhesha RPM, nguvu (gf), sasa na ufanisi kwenye 6S kwa kutumia propela za APC 16x8, 17x10 na 18x8 pamoja na ESC ya AMPX 80A.

Motor ya MAD X4229 230KV imetajwa kwa mipangilio ya 12S na inaorodhesha hadi 8.3 kgf nguvu ya juu ikiwa na uzito wa 397 g ulioimarishwa, pamoja na vipimo vya kina vya usakinishaji kwa ajili ya kupanga ufungaji.

Data za utendaji za motor ya MAD X4229 EP 230KV zinaorodhesha throttle, voltage, sasa, RPM, nguvu, na ufanisi kwenye 12S kwa kutumia propela za APC 17x10 na APC 18x8.

Motor ya MAD X4229 420KV imetajwa kwa matumizi ya 6S na ina uzito wa motor wa 397 g ikiwa na hadi 7.8 kgf nguvu ya juu katika data ya utendaji iliyotolewa.
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