B50-??S and B50-14L.
The size and weight are not so different.
B50-??S and B50-14L.
The size and weight are not so different.
Kontoronik speed controller 3SLB40-6-12 was used in this test.
The main rotor is 970mm (normal wood symmetry rotor was shorten. )
The cable connections for the correct drive direction
Please look above photo. From left, Green - Blue - Red.
However, in 33degC air temp., I slightly
felt the overheat problem, but
it will not be serious out of summer. Especially,
there should be no problem in winter (less than 10degC).
Anyway, if you feel the motor to be very hot after the flight,
16T-13T are sufficiently usable.
In comparison with HP220/20/A3P6 for
10cells + 16T pinion, the input power
from 0deg pitch to hover pitch is lower at the similar voltage and rpm.
So, this motor has higher drive efficiency rate.
Also, it is very good that the max input is always less than 300W.
It is kind for the battery.
素晴らしいデータです。その飛行感覚において、
重いモーターであることを感じさせないであろう
くらい高出力です。とは言え、33度の気温ではさすがに熱的に問題ありです。
夏場の連続フルハイアクロは厳しいかも？？
少なくとも温度管理はした方がいいでしょう。
となると、夏場はモーターとバッテリーに優しい16Tかな。
それでも背面アクロ可能なはずです。
さらに15Tまでギアを下げても普通に飛ぶでしょう。
一方、冬場は、このまま17Tでも
大きな熱的問題なく飛びそうです。きっと、すごーい飛びです。
GP機並のフリップも可能かあ？ 一方で、モーターにずっと優しい
13T,14Tピニオンギアも用意されているので、
ECO8で設定可能なギア比に関して何ら問題ないというのは、
このモーターにとって大変有利です。
冬場でさえ熱的にクレイジーな条件だった
HP220/20/A3P6 + 10cells + 16T pinionとの比較でも、このモーター
の優位性はよくわかります（なにしろ、
実フライトは（HP220/20/A3P6 + 10cells + ）15T だった事に注意 ）。
特に、0deg pitch からhoverにかけては
似たような電圧と回転数において、こちらが低入力です。
つまり高効率です。また、ここには示してませんが、負荷係数の観点からしても、
HP220/20/A3P6と同等な出力がやや軽い負荷になっています。
厳密な比較のため、今まで調べた中で比較的高出力の部類に入る
HP220/20/A3P6を以前と同じ条件で再測定してみました。
新しい結果を以下に示します。
まず、前回(HP220/20/A3P6 for ECO8のページ参照)と比べると、
同じギア比の回転数は全般にやや上昇気味となりました。
これは、前回の測定以降、ピッチリンケージの
樹脂リンクボールを金属リンクボールに置き換えたりしているので、
駆動系の動きがなめらかになったためと考えられます。
次に、上記B50-14Lのデータと丁寧に比べると、
HP220/20/A3P6よりもB50-14Lの方が効率がわずかに良い様に見えます。
これは、一定ピッチのローター回すに必要なエネルギーが
回転数の三乗に比例するという関係式を用いるとよく分かります。
また、そんな細かい比較しなくても、実際のベンチテスト時の
HP220/20/A3P6の焼け具合も、B50-14Lをはるかに越えてます。
この事は、以前の予想通りです。14Tでも夏場は焼け気味でしょう。
でも、すでにそのギア比ではユラユラ飛ぶだけになっています。
となるとやはり、HP220/20/A3P6は冬場用モーターです。
結論として、重くて大きい（長い）モーターの方が、
効率面、熱的問題で有利になる傾向があると思います
（「Hacker モーターの概観(overview and summary of Hacker brushless
motors)」において(いずれ)説明します。）。
In this respect, Hacker 11Wi-L(=B40-11L)
and B50-14S,15S,17S also similarly have high power, but
has a problem for the gear ratio useable in ECO8.
-----------
In order to check the measurement's precision in this page, some
previous examinations for HP220/20/A3SP6 were re-examined, as follows.
The previous examinations were done in cold winter (less than 10degC).
In addition, after the previous examinations,
some plastic linkage balls were replaced by new metal balls, as shonw in
the page of ECO8's acrobatic stage.
This replacement slightly reduces the friction of the linkage,
leading to the slight increase of the main rotor rpm .
(Please compare the following data with the previous data shown
in the page of HP220/20/A3P6 for ECO8.
Depending on the setting of the heli and conditions,
the performance data (slightly) varies like these. )
----- HP220/20/A3SP6 + 16T + 10cells
Let us compare this data for 15T with above data for B50-14L.
Through the whole of the data,
the data for B50-14L shows much higher rpm (by 30-70rpm) for
slight increase of the input power (by 10-20W).
It suggests that B50-14L has slight higher efficiency rate
than HP220/20/A3SP6.
In fact, in the air temp 35degC, HP220/20/A3P6 became very hot,
due to the low efficiency (= large loss-power).
It was MUCH hotter than hacker B50-14L
examined on the same day. Hence, again, we may say that
if we want to use HP220/20/A3P6 for active acro flights,
it must be limitted in winter season. On the other hand,
heavier B50-14L has better performance.
Flight impression with 15T
According to the results of benchtest, in summer (more than 30degC),
17T pinion gear may be severe for the motor.
So, I firstly try 15T pinion gear.
Basically, 15T is not suitable for acrobatic flights,
due to the powerless-ness.
But, it normally flies well. After hovering and forward flights for
about 5min (much longer flight time is possible),
the motor became very hot, but I can continue to touch the motor
for 5sec (50-55degC).
Therefore, this gear ratio will
be safe for the overheat in summer.
Accordingly, for 14T, there should be completely no overheat problem.
Out of summer, I want to try 17T for super-acro flight.
It will not cause such serious heat problem, at least in winter.
17Tピニオンでの様子を見ていると、夏場は熱的に厳しいかも？
そこで、まず15Tで飛ばしてみました。非力になるので、アクロバットは
無理（というかやりたくない）ですが、普通によく飛びます。
ギア比がゆるいので、飛行時間が長くなりそうですが、
さすがに気温35degCくらいなので、
熱的問題が心配になって5分で降ろしました。かなり熱いですが、
どうにか我慢して触っていられるレベルです。
たぶん、55degCくらい。最近のアビオ1406/2yの耐久テスト
の結果からすると、この程度なら熱的に全く問題ありません。
I tried acro flight with 16T pinion gear and 10cells.
The power feeling was similar to that of HP220/20/A3P6
with 15T pinion and 10cells. Loop and roll are easy.
In the flight, Mr.Matsumoto
took a photo of my inverted eye-level hovering.
Specifications ; Hacker B50-14L and 10cellsRC1700mAh, 16T pinion gear.
ESC is Kontronik 3SLB40-6-12. Gyro is temporally
Futaba head lock GY240(25g) (usually, GWS PG-01(15g) is used).
Wood symmetry rotor (short 970mm).
Max pitch is +9deg and -8deg. The total weight is 1.6kg.
After the flight (for about 5-6min in summer (29degC)),
the final temp. of the motor surface was 55-60degC.
It was very hot. I could touch it only for 3-5sec.
Probably, the temp will be still safe for the motor,
according to the test of my avoex1406/2y
(shown in
).
this page
1406/2Yの耐久テストの結果からモーター表面60degCまでなら磁石ダメージ
はほぼ皆無らしいので、夏場の16Tでも熱問題ないだろうと思い
、試してみました。前述の17Tのベンチテストの様子からして、
HP220/20/A3P6+15T並の飛びになるはずです。実際にそうなりました。
ループ、ロールはとても簡単。背面ホバも余裕。そんな5minフライトで
モーター表面温度はなんと60degC以下。夏場の17Tでも熱問題ないかも
知れませんが、(大事を取って)
楽しみは冬場にとっておこうと思います。
This motor gave good impressions for 10cells ECO8, even in hot summer.
In winter, with 17T pinion gear, super-acro flight is possible.
Even in summer, 16T is normally usable for acro flights
including inverted flight. If you like long flight duration,
14-15T is available.
For 10cells ECO8, there is no problem for the selectable gear ratio.
This is also a good advantage.
I recommend this motor
for hot countries and hot summer's acro and normal flights.
Also, this should be good for heavy scale 10cells heli.
But, since the Rm value is relatively low and the weight is
relatively heavy(250g),
if you strongly like long flight duration (rather than acro),
B50-18S(=Kontronik BL500-20), 19S and B40-15L may be better.
In order to obtain good performance, use good battery.
Finally, the battery performance determines the flight performance
rather than motor, I think so.
Rm値的に言うと、10cellsのアクロバット指向です。とにかく、
夏場の10cells背面アクロバットでも熱的にはなんとか?使えるレベル
というのは素晴らしいです。さすがに重い(250g)だけの事はあります。
しかも、そのパワフルな飛びはその重さを感じさせません。
夏場は大事を取って15-16Tで飛ばした方がいいかも知れません。
16Tでもアイレベル背面ホバ可能なんで、
このくらい飛べば何も言うことはありません。
負荷の大きい10cellsスケールヘリにも十分対応します。
また、BEC別電源化による重量増の問題がありますが、
12cellsヘリでも使えるでしょう。
ここから先はバッテリーの性能対重量比をどうやって上げるかという
問題が残されています。
------ Comments for the comparison with X250-4(H) ----
In comparison with X250-4(H) which has an internal cooling fan,
the heat level is still slightly higher.
But, note that if X250-4(H) is used for more than the 200W input power,
the heat level is comparable with that of B50-14L.
In addition, X250-4(H) for more than 250W
become hotter than B50-14L( and B50-xxS).
It means that internal cooling fan is not so effective for
high power flight. Hence, B50-14L is not so bad.
If B50-14L would have a cooling fan,.....
昨年試した夏場のX250-4H for 8cellsと比べると、
さすがに,あちらは冷却ファンの効果のためもう少し焼けません。
でも、そんなX250-4Hも夏場に200w以上で飛ばすと
冷却ファンの効果は急激に低下します。そうなると、
もともと高出力な大きく重いB50-14Lは威力を発揮します。
いっそうの事、このB50-14Lに冷却ファンが付いていればなあ.........
そう言えば昔、Hacker B40-11L(11Wi-L)のテストで同じ事言ったのを
思い出しますな。
Basic data :
7.47V (6cells) Io=1.8A 12850rpm ==>> KV=1720
The weight 250g is heavier than B50-xxS.
The low Io suggests the high efficiency rate.
Test 1; 10cellsRC1700mAh + 17T :
rpm A V W condition
1940 12.8 12.34 158 0deg pitch
1850 16.0 12.02 192 hover
1725 22.0 11.50 253 +9deg
1700 24.4 11.45 279 +10deg
1890 12.0 12.00 144
1815 16.0 11.72 188
1705 21.6 11.30 244
1675 24.1 11.22 270
1855 12.5 11.70 146
1760 16.1 11.35 183
1660 20.1 10.92 219
1635 22.1 10.87 240
This data is excellent. This motor is heavy, but
very powerful so that I should not feel
the increase of the weight in the flight.
Strict comparisons with HP220/20/A3P6 :
HP220/20/A3P6 tends to have easily the heat problem, due to the high
Io value. Instead, it was very powerful.
In addition, there is no problem for the gear ratio in 10cells ECO8.
Hence, I am using HP220/20/A3P6 only in cold winter, in order to
avoid the heat problem.
rpm A V W condition
over 2000 ! --- ---- ---- 0deg pitch
1890 ---- ---- ---- hover
1700 25.4 11.55 293 +10deg
1945 13.3 12.03 160 0deg pitch
1860 17.3 11.76 203 hover
1680 24.8 11.35 281 +10deg
1725 22.8 11.41 260 +9deg
----- HP220/20/A3SP6 + 15T + 10cells
rpm
1860 11.6 12.20 146 0deg pitch
1772 15.6 11.89 185 hover
1630 22.4 11.53 258 +10deg
1660 22.2 11.59 257 +9deg
1830 10.9 11.88 129
1745 14.8 11.62 172
1600 21.8 11.20 244
1635 19.2 11.30 217
1800 11.0 11.71 129
1720 14.6 11.43 167
1580 20.8 11.00 229
1600 18.4 11.03 203
---- Comparisons with B50-14L -----
Test 2; 10cellsRC1700mAh + 15T :
1650rpm ---A ---V hovering.
The rpm for 15T pinion reasonablely becomes low than 1772rpm for 17T.
Even in this gear ratio, ECO8 can normally lift off.
Flight impression with 16T pinion 
==>> close up ==>>
Summary
Appendix 1 ( performance table )
Hacker B50-14L and 10cells, 17T pinion gear.
Rm=0.0198 Io=1.030 KV=1750
-------------------------
input power (W)= I * V
output power (W)
efficiency rate (%) = output power / input power
loss power (W) = input power - output power
main rotor rpm
------------------------
6.000 7.200 8.400 9.600 10.800 12.000 V
0.020 1.030 165.278 10.588
6.000 7.200 8.400 9.600 10.800 12.000 V
30.000 36.000 42.000 48.000 54.000 60.000 5.0 A
23.427 28.191 32.955 37.719 42.483 47.247
78.090 78.308 78.464 78.581 78.672 78.745
6.573 7.809 9.045 10.281 11.517 12.753
975.304 1173.638 1371.971 1570.304 1768.638 1966.971
54.000 64.800 75.600 86.400 97.200 108.000 9.000
46.400 55.964 65.528 75.092 84.656 94.220
85.925 86.364 86.677 86.912 87.094 87.241
7.600 8.836 10.072 11.308 12.544 13.780
962.214 1160.548 1358.881 1557.214 1755.548 1953.881
78.000 93.600 109.200 124.800 140.400 156.000 13.000
68.739 83.103 97.467 111.831 126.195 140.559
88.127 88.785 89.255 89.608 89.882 90.102
9.261 10.497 11.733 12.969 14.205 15.441
949.124 1147.458 1345.791 1544.124 1742.458 1940.791
**** <<==== 0 deg pitch
102.000 122.400 142.800 163.200 183.600 204.000 17.000
90.445 109.608 128.772 147.937 167.100 186.264
88.671 89.549 90.177 90.647 91.013 91.306
11.555 12.792 14.027 15.264 16.500 17.736
936.034 1134.368 1332.701 1531.034 1729.368 1927.701
**** <<====== hover pitch
126.000 151.200 176.400 201.600 226.800 252.000 21.000
111.516 135.480 159.444 183.408 207.372 231.336
88.505 89.603 90.388 90.976 91.434 91.800
14.484 15.720 16.956 18.192 19.428 20.664
922.944 1121.277 1319.611 1517.944 1716.278 1914.611
****
150.000 180.000 210.000 240.000 270.000 300.000 25.000
131.955 160.719 189.483 218.247 247.011 275.775
87.970 89.288 90.230 90.936 91.485 91.925
18.045 19.281 20.517 21.753 22.989 24.225
909.854 1108.188 1306.521 1504.854 1703.188 1901.521
**** <<======== +10 deg pitch
174.000 208.800 243.600 278.400 313.200 348.000 29.000
151.760 185.324 218.888 252.452 286.016 319.580
87.218 88.757 89.855 90.679 91.320 91.833
22.240 23.476 24.712 25.948 27.184 28.420
896.764 1095.098 1293.431 1491.764 1690.098 1888.431
198.000 237.600 277.200 316.800 356.400 396.000 33.000
170.931 209.295 247.659 286.023 324.387 362.751
86.329 88.087 89.343 90.285 91.018 91.604
27.069 28.305 29.541 30.777 32.013 33.249
883.674 1082.008 1280.341 1478.674 1677.008 1875.341
222.000 266.400 310.800 355.200 399.600 444.000 37.000
189.468 232.632 275.796 318.960 362.124 405.288
85.346 87.324 88.738 89.797 90.622 91.281
32.532 33.768 35.004 36.240 37.476 38.712
870.584 1068.917 1267.251 1465.584 1663.918 1862.251
246.000 295.200 344.400 393.600 442.800 492.000 41.000
207.372 255.336 303.300 351.264 399.228 447.192
84.298 86.496 88.066 89.244 90.160 90.893
38.628 39.864 41.100 42.336 43.572 44.808
857.494 1055.828 1254.161 1452.494 1650.828 1849.161
270.000 324.000 378.000 432.000 486.000 540.000 45.000
224.643 277.407 330.171 382.935 435.699 488.463
83.201 85.619 87.347 88.642 89.650 90.456
45.357 46.593 47.829 49.065 50.301 51.537
844.404 1042.738 1241.071 1439.404 1637.738 1836.071
Appendix 2