JustGoFly

300DF Motor

Pushers are for wings and Jets.

Tractors are conventional motors mounted on the front of a plane through a firewall or behind a mount.. Pushers are normally on the rear of a plane and they axle faces away from the plane/wing. Pushers with a C Clip can be mounted on the front of a plane and act as a tractor would - in front of a firewall.

This is a great little brushless motor that is very powerful. I run it both direct drive and geared. Direct drive you should not go larger than 5x4 prop, which will get you exptremely high speed. A GWS 400 gearbox or something that holds a 400 size motor is ideal for geared operation in parkflyers, or 3D planes.

Yes - this motor, although called a 300DF is 400 size !

This motor is available in 2.3mm for geared operation, and I have some 3mm bells for direct drive. 2.3mm is more versatile, but 3mm is obviously less likely to bend or break. I use a prop saver on all my pushers and in addition to saving props, will keep the shaft from bending.

Specifications

Max Current: 10 Amps.

KV: 2250

Weight: 29.7 grams

Shaft Diameter: 2.3mm

Mount holes: standard 16.5 & 19.5

We have done extensive testing on this motor and are really excited about putting it into action in some of our IFO's, Tiger Moths (can you say 3D Tiger Moth), PT-17, and any plane 12 oz's or less should go 3D !

The motor has been tested and works well with two and three LiPo cells in series. I like them on three LiPos !

A two cell runs between 6 and 8.4 volts. A three cell runs between 9 and 12.6 volts, depending on the state of charge. See the Tech Chart to figure out what type of performance you'll get with these motors.

Tech Info

 

300DF Brushless Motor

300DF Brushless Motor

300DF Pusher Brushless Motor

300DF Pusher - Brushless Motor

 

Customer Images

DDFWAJ - Kyosho Illusion with JustGoFly 300DF

I lawn darted my Illusion after about the third flight and decided I wasn't going to pay $70 + dollars for what I consider a weak EDF so... after looking around the shop I decided on a JustGoFly 300DF motor. The 300DF on a Thunderpower 3-cell 1320mah spinning an APC 5.25 x 4.75 prop produces a good 163 watt @ 15 amp.
Dennis

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Micro Rafale Video by Mangognax


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Here are pictures of the Radical R/C Mini Stick. It's using a 300DF JustGoFly Motor, 3s900 LiPoly pack, 6x4 APC prop. It has 11 amps static draw, unlimited vertical, 60 mph! The plane flies great! Most flying is
1/3 to 1/2 throttle.
Dave
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This motor is just over half the weight of the Johnson 250 and only pulls 5.9A swinging a 4x4 prop on 3s LiPolys.

This light motor, because of the lower amp draw, let me use light weight batteries. So now I have a MSW 250 that only weighs 6.8 oz. With this setup the wing has full vertical and speeds about that of the MSW 250 with the stock motor (only pulling about 2-3 amps less).

The little I have flown this wing, the motor seems to be really good for the money.
Acer

http://speedwing.net/

 

300DF News

After much testing we have decided to raise the rating on this motor from 7.2 amps (11.1 volts) - 80 Watts, to 10 amps (11.1 volts) 110 Watts. This motor is a little powerhouse and after I pushed the same motor for more than a year over 10 amps, I feel very happy to raise the rating. It doesn't get hot at 110 Watts and runs like a motor much larger. I run it direct drive in wings, and geared in large and small planes.

Pushers and Tractor Motors available

Feb 20th - I just finished running some new direct drive numbers. This motor can handle 10 amps very well, but at 12 amps will get hot. I want to update the spec from 7.2 to 10 amps, but will first run a motor for 30 minutes at 10 amps to validate this claim. It seems the prop for high speed is 4.75 x 4.5. But if you trim back the size of the prop you will enable the motor to rev up the RPM more and trade some thrust for higher speed. I will run 4.1x4.1 soon.

300DF pusher props have proven to be spectacular. We ran one every night for an hour in a Wattage HyperWing. Actually I learned about wings with this motor and smacked it into the ground many times. I've broken props and sheared off the axle once. But this little motor totally kicks butt using a small prop direct drive. It is equally good with large props in a gearbox. So decide whether you want speed - 60+ MPH with a small prop or slow fly and 3D with a gearbox and large prop.

A buddy gave me the HyperWing since it flew like a brick. Fly it slow and it falls out of the sky, fly it fast and you could thread a needle with it. I was not a fan of wings. I thought I'd give it a couple weeks run and initially crashed it frequently. But now it is my favorite plane and is pushing me into very fast planes. My wing is 16 ounces, Hitec 555 Dual Conversion receiver, P35 Castle Creations ESC and APC 6x4 prop cut down to 5x4. The motor is setup to run close to 10 amps, but is running very cool. We rate it for 7.2 amps - so be wary of over amping the motor. But I do recommend you try it for a couple minutes and see if your motor and flying skills can handle the amps. Don't go over 10 amps, as you not only could destroy the motor and speed control, but will not get the same proportional increase in power. You turn the motor into a hot plane and trade amps for heat.

We have added Direct Drive data to our 300DF prop information. Check out that static pitch speed on a 5x4.3 !

Hit Next Gear Ratio or use the menu to see other charts.

Direct Drive

Motor

Prop
diameter
(inches)

Prop
pitch
(inches)

Prop make
& style

Voltage
at esc

Thrust
(g)

Thrust
(oz)

RPM

Amps

Watts

Thrust
(g/w)

Pitch speed
(MPH)

300DF

7

3.5

GWS HD

7.2

250

8.8

9960

6.1

44

5.7

33.0

300DF

5

4.3

GWS HD

10.8

390

13.8

18600

8.2

89

4.4

75.7

300DF

5

3

GWS HD

10.8

355

12.5

19500

7.2

78

4.6

55.4

Copyright ©JustGoFly

Feb 20th - new numbers run using MMM 25 ESC and APC props direct drive.

Motor

Gearing

Prop Diameter (inches)

Prop pitch (inches)

Prop make & style

Voltage at ESC

Thrust (g)

Thrust (oz)

RPM

Amps

Watts

Thrust (g/w)

Pitch speed (MPH)

Comment

Kv

% NL Kv

K RPM

300DF

Direct

None

0

NL

7

0

0

16500

1.2

8

0

0

 

2357

100.00%

16.5

300DF

Direct

5.5

2.5

APC

7

206

7.25

12500

5.3

37

5.6

29.6

This one achieves medium speed and lower amps with decent efficiency.

9 Amp looks wrong.

1786

75.76%

12.5

     

2.5

 

8

255

9

13000

6.3

50

5.1

30.8

1625

68.94%

13

     

2.5

 

9

312

11

16250

7.3

66

4.7

38.5

1806

76.60%

16.25

     

2.5

 

10

361

12.75

16450

8.3

83

4.4

38.9

1645

69.79%

16.45

     

2.5

 

11

411

14.5

17500

9.3

102

4

41.4

1591

67.49%

17.5

300DF

Direct

5.7

3

APC

7

206

7.25

12250

5.8

41

5

34.8

This prop looks like a good mix of thrust, speed and efficiency.

1750

74.24%

12.25

     

3

 

8

255

9

13500

6.9

55

4.6

38.4

1688

71.59%

13.5

     

3

 

9

305

10.75

14750

7.9

71

4.3

41.9

1639

69.53%

14.75

     

3

 

10

347

12.25

15700

8.9

89

3.9

44.6

1570

66.61%

15.7

     

3

 

11

397

14

16600

9.8

108

3.7

47.2

1509

64.02%

16.6

300DF

Direct

4.75

4.5

APC-CF

7

135

4.75

12360

5.4

38

3.5

52.7

This prop for high speed, low thrust and good efficiency.

1766

74.91%

12.36

     

4.5

 

8

170

6

13700

6.5

52

3.3

58.4

1713

72.65%

13.7

     

4.5

 

9

198

7

14900

7.5

68

2.9

63.5

1656

70.24%

14.9

     

4.5

 

10

234

8.25

16200

8.6

86

2.7

69

1620

68.73%

16.2

     

4.5

 

11

269

9.5

17200

9.6

106

2.5

73.3

1564

66.34%

17.2

300DF

Direct

5

5

APC

7

156

5.5

11600

6.3

44

3.5

54.9

Low amps, very good speed, medium thrust. Not as efficient as 4.75x4.5.

1657

70.30%

11.6

     

5

 

8

198

7

13000

7.5

60

3.3

61.6

1625

68.94%

13

     

5

 

9

241

8.5

14100

8.7

78

3.1

66.8

1567

66.46%

14.1

     

5

 

10

269

9.5

15100

9.7

97

2.8

71.5

1510

64.06%

15.1

     

5

 

11

305

10.75

15800

10.7

118

2.6

74.8

1436

60.94%

15.8

300DF

Direct

5.1

4.5

APC WIDE

7

206

7.25

10850

7.3

51

4

46.2

Very good thrust for 2S, 9.6v but not 3S. Efficiency decreases as voltage increases. This is a nice setup for 2S and not for 3S.

1550

65.76%

10.85

     

4.5

 

8

241

8.5

11800

8.6

69

3.5

50.3

1475

62.58%

11.8

     

4.5

 

9

284

10

12750

9.8

88

3.2

54.3

1417

60.10%

12.75

     

4.5

 

10

298

10.5

12900

11.2

112

2.7

55

1290

54.73%

12.9

     

4.5

 

11

312

11

13000

12

132

2.4

55.4

1182

50.14%

13

Copyright ©JustGoFly

300DF 3.4 Gearing