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Task Description

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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.

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Relevant Contacts

Assignees

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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

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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.

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• full wing with overlap aileron fully modeled

• mass of entire wing = 237.16 g

• mass of aileron = 20.57 g

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Author: Agapa Goombs Updating Date: 08 Oct 2024

Hinge Design Updates:

Important Notes:

• Due to the weight associated with adding a structure for mounting the flat face of Design 1, the decision was made to instead use the existing aileron-side hinge alongside a pivot spar.

• Alongside this, the number of hinge points was reduced from 4 → 2 to simplfy simplify the mountinng mounting of the aileron's end plates of the aileron.

  • Finally, the general modifications to the main wing was were standardized between the the Overlap and Hinge Design to minimize the time for integration.

    • Also exteds to the spacers used between Ribs

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• Aileron Span: 254.9mm

• Aileron Cord: 57.0598mm

Weight:

• Aileron: 26.94 gramsg

• Wing with Aileron: 243.47 g

Mass Summary

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