Micro Outrunner Motors

We did some in shop testing on this motor with a 7.4V pack, GWS 2.5-.8 prop-.98 amps, 31,900RPM, 103F, pitch speed about 18mph. GWS 2.5-1 prop, 1.1 amps, 30,800 RPM, 105F, pitch speed about 22mph. Both of these props were run for 1 minute. We also tested with the GWS 3-2 props, the motor overheated quickly and was down about 12k RPM. DO NOT try to run a 3" prop on 2S here. Current and tach readings taking at start, temp reading at end. The motor seems stable to me with 2.5" prop 2S setups. Certainly in air loads would be lower. I am getting excited to design a Sub-Micro-Stick! Notice although the RPM seems way too high for indoor, the pitch speed is very modest. You should note that our testing indicates an amp limit similar to the manufacturers below. When we obtain the new single cell ESC, we'll do some similar testing to determine some useful setups for 1 Lipo.

Specifications:
KV 4500
Voltage 3.7V
No load current 0.24A
No load RPM 16600 +/- 6%
Max continuous current 0.9A
Continuous RPM 10400+/- 6%
Resistance 1.18ohm
Dimensions 13 x 4.6mm
Shaft Dia. 1.5mm
Weight 3.5g

SKU Number: HEMICRO37V

Dimension: 30mm x 12mm, 38mm(with shaft)
Weight: 14.5g (kv4500) (not including connectors)
Diameter of shaft: 1.48mm
Length of front shaft: 8mm
Lamination thickness: .2mm

Spec.
Battery: 2 Cell 2S/7.4V
RPM: 4500kv
Max current: 6A
No load current: 7.4V/0.4A
Current capacity: 6A/15sec
Internal resistance: 0.473ohm
Dimensions: 12x30mm

Pull: 9400
Prop: EP4040
ESC: 7A
Max Current: 6.4A
Battery Type: 2S Only
Suited for Mini EDF or micro parkjets.

Dimension: 30mm x 12mm, 38mm(with shaft)
Weight: 14.5g (kv4500) (not including connectors)
Diameter of shaft: 1.48mm
Length of front shaft: 8mm
Lamination thickness: .2mm

Spec.
Battery: 2 Cell 2S/7.4V
RPM: 4500kv
Max current: 6A
No load current: 7.4V/0.4A
Current capacity: 6A/15sec
Internal resistance: 0.473ohm
Dimensions: 12x30mm

Pull: 9400
Prop: EP4040
ESC: 7A
Max Current: 6.4A
Battery Type: 2S Only
Suited for Mini EDF or micro parkjets.

SKU Number: HEMICRO74V

Model HESC - 5A
Conn. Current 5A
Burst Current (>10s) 7A
BEC Mode Linear
BEC Output 5V / 0.8A
Battery cell Li-ion, Li-Poly 2 ~ 3 cell
NiMH, NiCd 5 ~ 9 cell
Balance Discharege Protection N/A
Weight 4.5g
Size (L x W x H) 24 x 12 x 6

SKU Number: HESC5A

Specifications:
Weight: 8g
Max power 40W
Diameter: 17.8mm/.701"
Length: 16mm/.629" (Shaft Exlcuded)
Shaft Diameter.: 2mm
Shaft Length: 5mm
Max Amps: 4 Constant, 5 Amps 30 seconds.

Motor Constants as published: (except as noted)
C10-2100 Kv=2100 (RRC Measured 2032kv), Rm=?, lo=0.25, Eff. Op current=1.5 to 3A, 4A Max 30 seconds (RRC Estimate).

Props Suggested:
2S: 5-4,5.5-4,6-3,6-4
3S: 4-3,4-4,4.5-4,5-3

Combination ESC and Prop Adapter Choices available, select option below. 7.5-8V is estimated voltage of 2S lipo under load, 11.1 is 3S lipo under load. These should similate actual conditions pretty well.

Setup and Performance Chart as per MFG

Voltage	Prop	Amps	Watts In	RPM	Thrust oz.	Pitch Speed MPH
8v	GWS 4.5-4	2.3	18	10,170	3.14oz (89g)	38.5
8v	GWS 5-3	2.2	17	10,800	3.81 (108g)	30.7
7.5v	6x3	2.6	19	8430	4.23oz. (120g)	24
11.1v	4.5x4	3.3	35	12,210	4.76oz. (135g)	46.25
11.1v	5x3	3.1	33	13,110	5.75oz. (163g)	29.3

Estimates are MFG data. Actual performance may vary depending on components used, accuracy of data as provided by manufacturer, quality of ESC, weather and many other variables.

I am unable to get sensible data from motor calculators for this motor using available data. Actual test results below in chart. Note, we used 2 and 3S Lipo's of various sizes. The voltage listed is "as depressed" under the conditions of the test. Props used are GWS. If you can provide a link to serious motor constants please email me. I'm not interested in other dealers websites where the same incorrect data from the MFG's website are repeated. These guys are LAZY and never check out anything for themselves. On occasion we do. ;-)

Specifications:
Weight: 8g
Max power 40W
Diameter: 17.8mm/.701"
Length: 16mm/.629" (Shaft Exlcuded)
Shaft Diameter.: 2mm
Shaft Length: 5mm Max Amps: 4 Constant, 5 Amps 30 seconds.

Motor Constants as published: (except as noted)
C10-2900 Kv=2850 (my KV meter says 3036), Rm=?, lo=0.33, Eff. Op current=2 to 4A, 5A Max 30 seconds (RRC Estimate).

Props Suggested:
2S: 4-2.5,4-3,4-4,5-3
3S: 3-3,4-2.5

Combination ESC and Prop Adapter Choices available, select option below.

Setup and Performance Chart ACTUAL TEST DATA

Voltage	Prop	Amps	Watts In	RPM	Thrust oz.	Pitch Speed MPH
7.91v	3-3	3.3	25	18,000	??	51
8.11v	4x2.5	3.95	30	16,350	??	44.5
7.75v	4.5x3	4.55	38	13,380	??	38
7.89v	5x3	5.08	34	14,700	??	42
12.55v	3x3	5.2	64	24,500	??	69.5
12.5v	4x2.5	6.4	75	21,600	??	51

Estimates based on actual tests as detailed above. Actual performance may vary depending on components used, accuracy of data as provided by manufacturer, quality of ESC, weather and many other variables.