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The 7 stators shroud @ 1600 watts put out the same power as 4 stators shroud at 1700 watts. That show there is effecient gain. The data effecient gain is very close to my TJ100 5 stators VS. TJ100HP 7 stators. |
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3rd-dem - thanks for the input.
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After the sales pitch, Mark said: (snips)
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Tan, I know this is off topic, but have you given any thought to a precision 5mm shaft adapter for the Change Sun 12 blade 90mm like you have for the 70mm?
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maybe you need to balance the fan some more. This is how mine sounds. A bit noiser than the Turnigy L2855 motors but still pretty good.
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I could only run the CS70 for about 15 seconds because the amps were too high — and the battery was not even fully charged. A full LiPo would be bad; this is not a good setup for the 2W-20 motor. CS70 Note: This was not a freshly charged battery. Load Voltage: 10.36 after 15 sec. Watts: 774 Amps: 74 Thrust: 1148 grams Watts and thrust on my test stand are nice, but the amperage is not. Compare that to my 2W-20 test results (below) using a WeMoTec MiniFan with the same 3s Zippy 2800 LiPo, but now it's freshly charged. Here the input is over 1 volt more than with the CS70 (and a used battery). Thrust is only 20% less but the amps drop by nearly 50%. Interestingly, the watts drop by 46% without sacrificing too much thrust loss. WeMoTec MiniFan Note: Freshly charged battery. Load Voltage: 11.78 after 30 sec. Watts: 418 Amps: 37.9 Thrust: 917 grams |
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That CS10 wattage at 774W is a bit off, compared to what you should be able to get.
I get 1.25Kg for 700W with 4S on a 2600KV. 4S on a 2800KV is 800W for 1.35Kg 1.1Kg thrust should only need 600W area or so. 3350KV should give about 1.1Kg on 3S, so that part seems fine enough. But I don't know why it is drawing that excessive current. It should be more like 63A area. I think if current is abnormally high it shows the motor is over-stressed a fair amount. For the Wemo, 900g Vs 1150g is not 'the same' really. It is actually a fair way apart and the current needs rise faster than thrust output. So for 1150g in the Wemo - to match the CS10 - that Amps number would be more towards 45A area I would think. Still a lot more efficient than the CS10 combo gave. I am guessing the 2W20 is not up to the task for the CS10, thus over-loaded, inefficient and eating Amps madly. It is only a 40mm motor too - but it is 60A rated so even 800w shouldn't be too much for it to at least live through fine. It does still seem a bit excessive wastage... but maybe it is totally normal to be happening. And maybe 3S voltage, pushing for those higher power limits, at very high current, just doesn't work well in that motor. I am not sure... but it is not good. |
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I should note that on my test stand I use a HobbyKing POWatt Meter for my electrical measurements. It's not the most accurate gauge but gives a useful ballpark figure. |
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The CS rotor is a high load, doesnt matter what the motor is "rated" for, fact is this rotor needs a V8 with torque behind it, not a 1.4L TSI engine from volkswagen Think long can inrunners with a decent amount of mass.
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Latest blog entry: Extreme RC AUSTRALIA
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