Big Project | Project | Project Manager |
|---|---|---|
Comp 2025 | Peggy 2 |
Task Description
In order to improve our ability to land accurately on the landing pad, we are thinking of angling the landing gear inwards.
To best determine what angle makes sense for this, it would help to CAD (or find CAD for) the barrel itself.
This task consists of making a copy of the existing landing gear assembly and editing/remaking the 3D printed part to be angled, potentially with a brace of some kind.
You will also need to edit the feet in this copied assembly so that they sit flat when the drone is resting on the ground.
Constraints
Constraints | Written By | Append Date |
|---|---|---|
Adds minimal weight to the existing drone |
| |
Supports normal landing without failing |
|
Task
https://uwarg-docs.atlassian.net/wiki/spaces/MEC/database/2690187266?contentId=2690187266&entryId=22627f15-b937-4025-bd38-f6ec52622c1e&savedViewId=96af723e-7587-4107-b690-1ccf37ce5055Task Progression/Updates
Author: Alison Thompson Date:
Bay Convo
Conall’s geometry sketch (can be found in C:\WARG_CAD\COMP2025\Payload\Cone Payload\Prototype)
Other points:
Anti-tipping bars
Connect all 4 landing gears
Author: Camilo Artigas Alos Date:
Bay Convo
Notes:
Integrate tipping bars to current motor mounts
Find dimensions for tipping bars and consider the propellers
Figure out the plate that will provide support to the 4 legs on the bottom
The length for the legs is not a constraint
Look at excel file for cycle capacity for each leg length
Author: Camilo Artigas Alos Date:
Revision #1
My focus with this revision was to keep it parametric and easy to modify. This is because a lot of the parameters needed have not been determined so far (angle of landing gear, length of cf tubes, etc…)
Within this assembly, the angle of the landing gear and the length of the carbon tube can easily be modified within the text file in PDM. I’ve tried it many times and it’s worked so I apologize in advance if you’re greeted with a lot of errors if you try to do so.
For this model I chose an angle of 20 deg and I did not change the length of the cf tubes. I also made a copy of Pegasus' assembly to see how this design would look on the drone.
This leads me right into the support plate. I decided to not design the actual plate, but rather how I thought it should be mounted. This is because the size of the payload is currently being determined by Conall Kingshott. Within this design I implemented heat inserts into the bottom part of the landing gear, which I think would be a viable option if the plate also went around the cf tubes.
Disclaimer: The support plate has a lot of sketchy in-context relations within the assembly and is not parametric as the rest of the design, so suppress its assembly if you’re going to play with the parameters.
I also have decided to integrate the tipping bars when I have feedback with this revision, this way I will be able to do so efficiently.
Next steps are of course to get feedback, but also settle on the parameters, evaluate the way to attach the support plate to the drone and start printing.
Author: Conall Kingshott Date:
Overall, this looks really good. I think the modifications at the top seem really solid. Everything up here I’m happy with after my first look.
The black 3D printed foot part here also looks really good to me. The big thing I think we’ll need to work on is the center plate. First note is that the angles it goes at right now to fit around the tube aren’t something we can manufacture right now. We would normally make a part like this on a water jet, but a water jet can only cut straight up and down. There isn’t a good way to make a cut like this on a mill or drill press. It’s not too big of a deal as you could just make it a 2D shape with clearance, but it’s worth thinking about.
As far as what you have mocked in as the center plate right now, I don’t want to comment too much because it’s a placeholder. What I will say is that we may need to consider CF tubing for these cross braces because we are likely going to have a good bit of compressive force on these cross-members when landing. CF isn’t very good in compression, but it’s light and we can get tubing which will give a much higher moment of inertia which should help. My concern if we did out of thin aluminum like this is that it would bow, and thicker aluminum would be too heavy. I think we would want to allow the 3D printed foot to include mounting spots for CF cross-braces. Then you’d probably need to make a square for the cone to fit in with an open bottom, kind of like this, where red is CF tube and blue is the water collection mechanism.
As far as the exact path forward on that particular issue, I think I need a bit of time to think about it because it’s not immediately clear to me. Hoping to talk to some combination of Alison Thompson Smile Khatri and Evan Janakievski to figure out a path forward.