- Blog entry posted in 'Hunter Killer', August 23, 2009.
Since I've never made anything like this before, choosing these parts was rather hard. I have done as much homework as possible but there is no way to know how well a part is going to work with another until you try it. So here are some details..
Motors: Mystery 5000 Rpm/V Outrunner Brushless Motor D2825-5000
Code:
Model: D2825-5000
Rpm(Kv): 5000Rpm/V
Max Currect: 25A
Max Eff: 96%
Weight: 35g ( Motor Net Weight )
Total Length: 40.1mm (Motor and Shaft)
Motor Body Diameter: 27.8mm
Shaft Diameter: 2.26mm(Front)
Shaft Length: 13.9mm
Recommended Input Voltage: 6 - 18 Volt
I was rather impressed with the weight a lot lighter than expected and the max current is perfect to allow more air time than orignally thought.
Electronic speed controllers: Mystery 30a ESC
Code:
Constant Current: 30A
Input Voltage: 5.6V - 16.8V
Max Current: 40A
Low Voltage Cutoff: Shut Off / Power Reduce / Ignore
Inside Impedance: 0.0044
Reversion: Yes
Size: 57mm X 25mm X 8mm
Weight: 18g (Net Weight)
PWM Frequency : 8KHZ/16KHZ
Since I ordered the Axon microcontroller a few days ago I've been reading about frequencies and timing. The PWM (Pulse Modulation Width) 8KHZ doesn't give us enough speed variations, so 16KHZ is perfect!
Battery: Mystery 25C 11.1V 2200 mAh Lipo Li-Po Battery
Code:
Capacity: 2200mAh
Burst Rate : 30C (2200 X 30 = 66000mah = 66amps)
Continuous discharge rate: 25C (2200 X 25 = 55000 = 55amps)
Voltage: 11.1V
Cells : 3
Size :105mm x 33mm x 22mm
Weight: 170g
T / Deans Connector
This is a relatively light battery for the capacity and was a major factor in deciding on this battery. It will definitely have enough grunt to run two motors (25 amps each) Depending on the overall weight of the HK we might put two of these in or replace with a heaver more powerful version.Comments
