Hawkfly 2207-2800KV motor - 2KG THRUST - RC Groups
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Nov 10, 2017, 11:40 AM
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Melkmeisje's Avatar
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Hawkfly 2207-2800KV motor - 2KG THRUST


This Hawkfly 2207 - 2800KV motor can deliver up to 2 KG thrust for $20.98

https://www.banggood.com/Hawkfly-AT2207-2207-2400KV-2600KV-2800KV-3-4S-Brushless-Motor-...01502I









Specification:
Brand Name: Hawkfly
Item Name: 2207 2400KV/ 2600KV/ 2800KV 3-4S Motor
Mode: AT2207 Ⅱ
Framework: 12N14P
No. of Cells: 3 - 4S
Color: Green / Sliver
Version: CW Screw Thread
KV: 2400KV / 2600KV/ 2800KV
NO-Load Current (10V): 1.35A
Max. Lipo Cell: 2-4S
Motor Resistance: 35.7mΩ
Stator Diameter: 22mm
Stator Thickness: 7mm
Shaft Diameter: 5mm
Outside Diameter: 28mm
Body Length: 18.4mm
Weight: 31.64g ( with cable )
Last edited by Melkmeisje; Nov 10, 2017 at 11:45 AM.
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Nov 11, 2017, 04:08 AM
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Another ridiculous power/thrust claim that probably will be demo'ed soon with a fake video, while the laws of physics can simply demonstrate such figures can't be obtained in the real world.

To accomplish the task described in the table above, a 6040 prop must turn with 28000 RPM, while the best prop in the 6" class I know break at 17000 RPM, and is not the propeller KingKong, that sell atm for one cent, heavily BF discounted at HK...

Not the last, a 30 grams motor can't deliver more than... let's say 300 real watts, not fake watts as those PMPO labeled on the Chinese speakers, that are sometimes even 100x more than the real wattage.
Nov 11, 2017, 05:56 AM
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Melkmeisje's Avatar
Quote:
Originally Posted by renatoa
Another ridiculous power/thrust claim that probably will be demo'ed soon with a fake video, while the laws of physics can simply demonstrate such figures can't be obtained in the real world.
To accomplish the task described in the table above, a 6040 prop must turn with 28000 RPM, while the best prop in the 6" class I know break at 17000 RPM,
I think it is overrated too but that has nothing to do with the laws of physics. eg. the ZMX 2205 V2 will pull over 1.5 kg of thrust with a 6045 on 4S doing more than 17K rpm

Quote:
Originally Posted by renatoa
Not the last, a 30 grams motor can't deliver more than... let's say 300 real watts, not fake watts as those PMPO labeled on the Chinese speakers, that are sometimes even 100x more than the real wattage.
A motor in this size will easily pull more than 300 watts and thats exactly the weak spot of any high powered motor. I don't know any battery wich is capable of delivering the amp's needed to pull this of. (for all the 4 motors on a quad)
Nevertheless, these are some powerful motors.....
Nov 11, 2017, 06:06 AM
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Really nothing to do ? Belief based propulsion...
Let's write down some propellers thrust and power formulas, what do you think ?
A 6045 two blades turning at 17k can't produce more than 720 grams thrust whatever amps it draws. A normal draw should be 15 Amps, for an average 77% efficiency.
It needs 24k for 1.5kg, and will draw 45A.
Last edited by renatoa; Nov 11, 2017 at 06:14 AM.
Nov 11, 2017, 06:47 AM
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Quote:
Originally Posted by renatoa
Really nothing to do ? Belief based propulsion...
Let's write down some propellers thrust and power formulas, what do you think ?
A 6045 two blades turning at 17k can't produce more than 720 grams thrust whatever amps it draws. A normal draw should be 15 Amps, for an average 77% efficiency.
It needs 24k for 1.5kg, and will draw 45A.
What are your formulas worth if they don't reflect reality?
Many tests have been done with those propellers that disprove your claims easily.
- your amps are totally off
- max rpm? Nope, even KingKong 6x4 can spin much faster. And they do with the right motor.
- wattage? Lol, 300 watts... Miniquad motors draw 500-600 watts. Each of them. And batteries can actually deliver that energy for a brief moment.

Just have a look at this data. I would have thought that this website is widely known in this forum.
http://www.miniquadtestbench.com/cob...07-2450kv.html
Nov 12, 2017, 12:51 AM
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Regardless of the actual bench test results, I love the colors and design of this thing.
Also the weight being in same class as the BH motors, its definitely an appealing offer.
The only thing i really dislike is the 19/16 base. All new multirotor motors should come with a 16/16 pattern.
Nov 14, 2017, 11:05 AM
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Don't worry about renatoa, he doesnt understand the physics behind this at all and actively ignores real test results based on some magical ideas in his head.
Nov 14, 2017, 11:18 PM
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Nice motor for fast speed flying wing.
Nov 15, 2017, 04:51 AM
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I still wait you to show me your physics instead questionable tests obviously done for marketing purposes only.

So far, the Dubai drone taxi propellers are done in a factory in our town, and I checked the formulas used in RC flight for decades with engineers from there.
Nov 15, 2017, 05:20 AM
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You are still wrong.
Bench testing motors is not complicated and done by lots of people in private who come to similar results.
Nov 15, 2017, 06:18 AM
Registered User
Sure, and field results shows results matching my reality, motors advertised to draw 30 Amps on bench not able to draw more than 11 Amps during the most wild acrobatics my fellows are able to do.
No, is not the pack unable to deliver power, is the prop doing the right mechanical work, according to physics laws.
Nov 15, 2017, 06:48 AM
Registered User
Wrong. If I accelerate full throttle on F40 Pro + Gemfan 5152, Im drawing 150A maximum (37.5A / motor). Battery: R-Line 2.0. Bench test says: 40A on heavy props, thats pretty accurate. Yes, my current sensor is calibrated. Im even having Kingkong 6x4 here, just no quad to put them on.
Are you just a troll?
Nov 15, 2017, 07:29 AM
Registered User
He's just the kind of guy that doesn't understand something, then thinks his tiny experience in the matter, in this case using weak engines with weak batteries, is the only way things can be done.

It wouldn't be so bad if that ignorance was contained somewhere but here people are reading to learn and he's making incoming pilots less knowledgeable.
Nov 15, 2017, 07:31 AM
Registered User
I think the trolls are those coming with numbers that contradict the whole RC history propulsion for decades...
Why EDF were invented if such thrust figures would have been available with 30 grams motors and 5" props... ridiculous...
Nov 15, 2017, 10:11 AM
Registered User
You know how it works Ren. Pure unadultered magic! You continue using tiny motors with low output and we'll continue flying by you doing 120 mph+. Dealsies?


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