eBig Project | Project | Project Manager |
|---|---|---|
Post-comp fixed wing | Wing Design |
Task Description
Based upon current CAD of the wings and research completed, design ailerons for our wings to allow for the correct flight controls. Refer to Wings for the design decisions made for the wings. The CAD can be found in PDM at Fixed Wing → Fixed Wing Design → Wings.
Additionally, refer to Aileron Sizing for a starting point. A lot of the research and calculations were based on Sizing Control Surfaces which can also be used for reference. The fixed wing calculator has lots of working info as well.
I suggest brainstorming a few ideas and asking for feedback as there are many factors at play. This task may require more research into aileron shapes. Some thought into linkage/servo connection would also be good.
Constraints
Constraints | Written By | Append Date |
|---|---|---|
1 aileron per wing |
| |
Adheres to sizing found in Aileron Sizing |
|
Relevant Contacts
Subteam | Contact | Contact Description |
|---|---|---|
Subteam collaborating with | @ of contact | what is the contact responsible for? |
Assignees
Assignee | Asana Task | Date |
|---|---|---|
Task Progression/Updates
Author: @ person updating Date: 2024/09/25
Design Progression #1
Initial Ideas:
The initial idea is to take the existing rib and create a cut, splitting it into two parts.
The more extensive section of the rib towards the leading edge will form the profile for the main wing.
The smaller section of the rib towards the trailing edge will form the rib of the aileron flap.
The aileron and the rest of the wing will be covered in the same singular piece of fabric.
The fabric will cover gaps between the aileron and wing. This is thought to improve aerodynamics.
The aileron will be attached to the wing by a hinge at the top edge of the rib.
Top placement reduces adverse yaw.
The servo will control the aileron movement using a horn and torque rod.
Progress:
Initial Ideas
The idea was to overlap the aileron cutout with the total aerofoil and connect them with a spar or pin.
Concern → weakness of a balsa joint with a metal pin passed through
Idea 1: use a sheet metal plate on either side of the balsa rib to reinforce the joint → whether we want to use
Concerns →
Lack of vertical constraint and twisting resistance with the balsa for the rest of the rib that is not covered by the sheet metal.
Use an aileron leading edge spacer across the entire design → weight concern
The result was to instead use frame to strengthen the ribs and constrain them from movement as shown in Design #1:
Design #1: Embedded mounts with Sheet Metal Rib Frames
Dimensions:
Aileron Cord:
In line with the suggestions for the cord length
Total cord length: 230mm
Aileron Cord: 57.5mm → 25% of the cord (upper end of 15-25%)
Aileron Span
Total semi span: 750mm
Aileron span: 250mm
Aileron Span Ratio: 33.3% → 35% of the cord (below lower end by 2%) → concern of increasing since the design needs the ribs to line up.
Concern → syncing up with the existing rib spacing and the wing's trailing edge with a potential cutout and wall to mount the wing hinge
Current Mass
Mass: 22.53 grams
→ excludes integration mechanism and corresponding changes.
Suggestions for Servo Horn Mount:
Place holder depending on the servo used:
Author: Nathaniel Li Updating Date:
Aileron Sync
Confirm using the updated ribs
CAD the overlap design
Required materials → Manufacturing
Try everything to be a 3D print
Make a weight comparison
TBD servo placement (need to get from Smile?)
Author: Sam Wong Keegan Jeewan Updating Date:
Overlap Design Updates
full wing with overlap aileron fully modeled
mass of entire wing = 237.16 g
mass of aileron = 20.57 g
