Motor
Contents

 

What is a Motor?

It is the component that provides thrust to the rocket, working on the principle of action-reaction. Depending on its fuel, it can be liquid, solid, or hybrid. Solid-fuel motors are commonly used in model rockets. Before starting the rocket design, motor analysis and selection are necessary. Due to their hazardous nature, it is recommended to procure them commercially rather than manufacturing them. For safety reasons, it should be the last component to be assembled onto the rocket.

 

Motor Selection

Motors with high acceleration, speed, or burn duration can be chosen based on the rocket’s design. For this, the burn profiles of the motors need to be analyzed and compared. For the most accurate burn profiles, it is advisable to review the graphs prepared by the manufacturers.

 

Commonly Used Motors in Model Rocketry

L1050

Diameter75 mm
Length486 mm
Total Weight3448 g
1774 g
Avg. Thrust1046.1 N
Initial Thrust1093.1 N
Max. Thrust1208.4 N
Total Impulse3727.0 Ns
Burn Time3.6 s
Isp214 s
Pro 75-3G
L1050 Thrust Diagram Image

L1050

Diameter75 mm
Length486 mm
Total Weight3448 g
1774 g
Avg. Thrust1046.1 N
Initial Thrust1093.1 N
Max. Thrust1208.4 N
Total Impulse3727.0 Ns
Burn Time3.6 s
Isp214 s
Pro 75-3G
L1050 Thrust Diagram Image

M2020

Diameter

75 mm

Length

893 mm

7032 g

4349 g

Avg. Thrust

2021.9 N

2502.3 N

Max. Thrust

2680.4 N

Total Impulse

8429.4 Ns

Burn Time

4.2 s

Isp

Motor Case

Pro 75-6G

M2020 Thrust Diagram Image

M2020

Diameter

75 mm

Length

893 mm

7032 g

4349 g

Avg. Thrust

2021.9 N

2502.3 N

Max. Thrust

2680.4 N

Total Impulse

8429.4 Ns

Burn Time

4.2 s

Isp

Motor Case

Pro 75-6G

M2020 Thrust Diagram Image

N5800

Diameter

98 mm

Length

1239 mm

14826 g

9021 g

5774.1 N

6701.3 N

Max. Thrust

8034.6 N

Total Impulse

20145.7 Ns

Burn Time

3.5 s

Isp

228 s

Motor Case

Pro 98-6GXL

N5800 Thrust Diagram Image

N5800

Diameter

98 mm

Length

1239 mm

14826 g

9021 g

5774.1 N

6701.3 N

Max. Thrust

8034.6 N

Total Impulse

20145.7 Ns

Burn Time

3.5 s

Isp

228 s

Motor Case

Pro 98-6GXL

N5800 Yanma Şeması Görseli

M1545

Diameter

75 mm

Length

1025 mm

7878 g

4835 g

1547.3 N

Initial Thrust

1642.2 N

1840.2 N

Total Impulse

8186.7 Ns

Burn Time

5.3 s

Isp

Motor Case

Pro 75-6GXL

M1545 Yanma Şeması Görseli

M1545

Diameter

75 mm

Length

1025 mm

7878 g

4835 g

1547.3 N

Initial Thrust

1642.2 N

1840.2 N

Total Impulse

8186.7 Ns

Burn Time

5.3 s

Isp

Motor Case

Pro 75-6GXL

M1545 Yanma Şeması Görseli

References & Further Reading

  1. DUTlab, DUTlab VENÜS Project, 2021
  2. Thrustcurve.org, Cesaroni 3727L1050-P.
  3. Thrustcurve.org, Cesaroni 20146N5800-P.
  4. Thrustcurve.org, Cesaroni 8187M1545-P.
  5. Thrustcurve.org, Cesaroni 8187M1545-P.
  6. Thrustcurve.org, Cesaroni 8429M2020-P.
  7. L1050 thrust diagram image | Canadian Association of Rocketry.
  8. M2020 thrust diagram image | Canadian Association of Rocketry
  9. M1545 thrust diagram image | Canadian Association of Rocketry
  10. N5800 thrust diagram image | pro38.com

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