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The new attachment goes over both sides of the wheel so that the wheel is equally supported. There is a single hole in both the support and attachment where a servo will go to allow the landing gear to be moved so that the plane is steerable.

image-20241003-223843.png

image-20241003-223536.png

Author: Ben Lovegrove 2024/10/10

Revised Design and Sims

The front landing gear had cutouts applied so that the weight of the part can be reduced.

image-20241010-121818.pngImage Addedimage-20241011-005104.pngImage Added

Objective of Sim

The goal of the sim is to ensure that the cutout holes do not reduce the integrity of the part enough so that it would fail on landing.

Simulation Setup

Assumptions and Preliminary Calculations

  • Assuming that Eclipse is 5kg

  • Fg = 5(9.81)

= 49.05

  • Applying a safety factor of 3, 150 newtons was applied to the part

  • Used Aluminum Alloy

Applied Loads

Load was applied to both axle holes

...

Fixtures

The mounting holes are the fixture for the test.

...

Mesh

Trial #

Mesh Parameters

Screenshot

1

Element size: 2mm

# of nodes: 38634

 

image-20241010-140138.pngImage Added

2

Element size: 1mm

# of nodes: 115345

 

image-20241010-135859.pngImage Added

3

Element size:

# of nodes:

 

Results

Trial #

Maximum Stress (MPa)

Min Safety Factor

Screenshot

1

 138.17

1.72

 

image-20241010-140240.pngImage Added

image-20241010-142209.pngImage Added

image-20241010-142807.pngImage Added

image-20241010-155339.pngImage Added

2

 154.83

1.3402

 

image-20241010-230626.pngImage Added

image-20241010-230744.pngImage Addedimage-20241010-230922.pngImage Added

image-20241011-004508.pngImage Addedimage-20241011-004553.pngImage Added

3

 

 

Could also include minimum safety factor.

 

Conclusion

  • The landing gear will be able to survive landing

Author: Ben Lovegrove 10/11/2024

Sims for Front Landing Gear with Triangle Holes

Simulation Setup

Assumptions and Preliminary Calculations

  • Assuming that Eclipse is 5kg

  • Fg = 5(9.81)

= 49.05

  • Applying a safety factor of 3, 150 newtons was applied to the part

  • Used Aluminum Alloy

Applied Loads

Load was applied to both axle holes

image-20241110-204439.pngImage Added

Fixtures

The mounting holes are the fixture for the test.

image-20241110-204216.pngImage Added

Mesh

Trial #

Mesh Parameters

Screenshot

1

Element size: 2mm

# of nodes: 24269

 

image-20241110-203444.pngImage Added

2

Element Size 1mm

Nodes: 93681

image-20241110-203803.pngImage Added

image-20241110-203820.pngImage Added

Results

Trial #

Maximum Stress (MPa)

Min Safety Factor

Screenshot

1

 111.83

2.50

image-20241110-203606.pngImage Added

image-20241110-203903.pngImage Added

2

 144

1.9

 

image-20241111-044207.pngImage Addedimage-20241111-044226.pngImage Added

 

Conclusion

  • The landing gear will be able to survive landing

Author: Ben Lovegrove Date: 10/11/2024

Validation of Servo

  • Assuming that Eclipse is 5kg

  • Fg = 5(9.81)

= 49.05

Distance of rear landing gear to front landing gear = 676

Distance of front landing gear to CoM = 176

Moment = .176(49.05) - FN (.676)

0 = .176(49.05) - FN(.676)

FN(.676) = .176(49.05)

FN = 12.77N

Assuming coefficient of friction between concrete and foam is 1.8 (twice that of sliding friction, professor said that it would be higher than sliding friction)

radius = .037

Mass Moment of Inertia (xx direction) = 0.038527

alpha = angular velocity, assuming 1radian/sec

Torque = 1.8FN x r + I x alpha

= 0.889 Nm

Servo is 0.297Nm

So we need to select a new servo

Author Ben Lovegrove

Rear Landing Gear

Objective of Simulation

Validate the rear landing gear.

Assumptions and Preliminary Calculations

  • Assuming that Eclipse is 5kg

  • Fg = 5(9.81)

= 49.05

Distance of rear landing gear to front landing gear = 676

Distance of front landing gear to CoM = 176

Moment = .176(49.05) - FN (.676)

0 = .176(49.05) - FN(.676)

FN(.676) = .176(49.05)

FN = 12.77N

Using Aluminum Alloy

Applied Loads

Load was applied to the far servo holes

...

Fixtures

The mounting holes are the fixture for the test.

...

Mesh

Trial

Mesh Parameters

Screen Shot

1

Element Size 1mm

Nodes 29744

image-20241111-042631.pngImage Added

2

Element Size .5mm

Nodes 125884

image-20241111-043434.pngImage Added

Results

Trial

Max Stress

Min Safety Factor

Screenshot

1

97.386

2.5671

image-20241111-043039.pngImage Addedimage-20241111-043028.pngImage Added

2

110.77MPa

2.2569

image-20241111-043607.pngImage Added

image-20241111-043637.pngImage Added

Author: Smile Khatri 2024/11/13

Awesome work so far, super happy to see the engineering work you’ve put into the landing gear! Some next steps:

  • Where are we getting the servo attachment disk from? Do you have a specific part #?

  • Can you look into which servo we should order?

  • Other than that, the rest looks good. Best way to find out if it works is by making it and testing it!

Author: Ben Lovegrove 2024/11/16

Here’s the part I found for the attachment, it’s on amazon

The new servo I think we should use is the ds3235, it has twice the torque we need and we have it in the bay.

Servo there’s a link to the specs of the part.