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e-Electric Motors & Controllers > B50-13l
 
 
estevens
Senior Heliman
Location: Phoenix, Arizona

Wondering if anyone out there has had experience with the Hacker B50-13L. At this time I'm trying to make a decision for my Logo 10. I don't fly heavy 3D (at least at this time), but want to be able to loop, roll, etc. I would like to get about a 6 minute run time or a little longer, thus I'm a little hesitant on the B50-11L. I am planning on running 12 cells. If I go with the B50-13L I was also thinking of using a 13 tooth pinion. Any input would be greatly appreciated.

Eric
09-30-2002 Over year old.
 
 
gwright
Senior Heliman
Location: Melbourne, Fl

The 11L with 13 tooth pinion at 75% on the ESC/governer and 12 3000 panasonic hydrides will do exactly what you want. With that setup, and the flying you're talking about, you should get in the neighborhood of 7.5 to 8 minutes. When you want more power, just turn the throttle/governer up to 85~90% , which will cut runtime a couple minutes, but with rather dramatic increases in power. The 13L will work, as you suggest, with 80~85% throttle values and give you the 7 to 8 minutes you'd like, but the 11L will allow that, plus higher performance if you just increase throttle percentage. Be carefull not to go below 70% or so with the throttle on the controller. They get very hot with constant part-throttle usage (full throttle is the coolest/easiest on a controller, hence the problems sometimes with heli ESC's). If you're at or above 70%, things will be fine. The logo 10 with 11L/13T, and 65% is a nice play-around for 9 minutes setup (no aerobatics, just hovering around, backwards circles, pirouetting circles and eights,..etc.), but controller temperature gets way too high for my tastes.
10-01-2002 Over year old.
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flatspin
Veteran
Location: H.V. Pa.

Pardon the silly question but I don't have an electric heli yet. When one cuts the percentage of throttle on ESC say from 90% to 70% that drops the headspeed, right? What is the acceptable range of headspeed on the Logo 10? What headspeed would say 11L with a 13t give you at 90% and 70%?
10-19-2002 Over year old.
 
 
gwright
Senior Heliman
Location: Melbourne, Fl

yes, cutting throttle/governer percentage reduces headspeed, also reduces current, and increases runtime. However, electronic speed controls are happiest (coolest) when totally off, or totally on full throttle), and they run the absolute hottest in the 50 to 65 percent range, therefore, you really want to keep the governer at around 70% or above. If you use a very powerfull wind motor, then just cut throttle percentage down to get flight time, it works, but the ESC can get extremely hot, maybe over it's thermal rating. General consensus with the "standard and acceptable" logo 10 powersystems is 1200 to 1600 on the rpms. I wanted lots more power, and didn't mind a decrease in flight time, hence the 11L motor I'm using, and very high rotor rpms (I can go over 2K if I run it at 100%, but in the 1900 range at 90%). Lower rpms and more pitch is more efficient for long duration hovering and such, but that's not what I'm into, so I opted to tune for power hence the very high rpms .
10-21-2002 Over year old.
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e-Electric Motors & Controllers > B50-13l
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