Servo Mounting Method
Inside wing with horizontal path.
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Servo Horn & Linkages
I was thinking we could 3d print horns and as for linkages I haven’t done too much looking.
Hinge Method
Custom 3d printed hinges using a Chicago bolt as the pin. Foam Tac or other types of epoxies can be used as well.
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Make sure the specific epoxy will not damage the wing/aileron material.
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still a W.I.P specific dimensions have not been decided also feedback is appreciated :)
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Something I forgot to add to the hinge page last time was hinge moment positions. Other than forum writers' writer opinions it doesn’t seem like one is better than the other. One point that did stand out to me though was that center hinge moment moments have the most material above and below them creating a stronger mounting area. Frise hinges help with counter adverse yaw but can be more complex and complicate geometry (later in the page I talk about a simpler solution).
Sealing The Hinge Gap
When making the plane it is something we should look into. It doesn’t require much planning ahead but it can make a slight difference. Sealing the aileron hinge gap can help create more lift at lower speeds, especially when the ailerons are out of position.
https://www.amaflightschool.org/diy/sealing-aileron-hinge-line
Aileron Location
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Thoughts? I couldn’t find any info on the difference they make during flight.
Countering Adverse Yaw
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Adverse yaw is the tendency of an airplane to yaw in the opposite direction of the turn. For example, as you roll to the right, your airplane may initially yaw to the left. The aileron angled downward (the left aileron in this example) produces more drag and more lift, initially yawing the airplane in the opposite direction of your roll.As previously mentioned Frise ailerons can help reduce adverse yaw by making form drag to counter induced drag.
Frise Ailerons
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As previously mentioned Frise ailerons can help reduce adverse yaw by making form drag to counter induced drag.
Differential Ailerons
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One aileron is raised a greater distance than the other aileron is lowered. The extra upward aileron movement produces more drag change than an increase in AOA on the downward aileron. This produces an increase in drag on the descending wing, which reduces adverse yaw.
Personally, I think differential ailerons are the way to go because they can be easily implemented through the radio/code or mechanically and are more adjustable in the future than Frise ailerons.
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Aileron Location and Sizing
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Thoughts? I couldn’t find any info on the difference they make during flight.
Determining Aileron size
The size of the aileron will influence our roll speed. Once we decide on a desired roll speed and have more detailed wing dimensions (max cord length and max individual span of a wing) I can start calculating specific dimensions for the aileron.
http://www.flightlevelengineering.com/downloads/ProAdvice 3 - AILERON SIZING.pdf
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The standard for RC planes are shown in the diagram above.
Cord length of aileron = 1/4 of cord length of wing
Aileron length = 1/4 of wing span
As more percentage of wing becomes aileron the roll speed increases. If we are interested in deviating from the standard there are formulas for determining aileron dimensions based on desired roll speed for “Hershey Bar Wings”. Hershey Bar Wings are rectangular wings with a constant chord length.
http://www.flightlevelengineering.com/downloads/ProAdvice 3 - AILERON SIZING.pdf
Selecting Servos
To properly select the servos we need to know a few things:
The max span of the wing
The max chord of the wing
Desired roll speed
Desired max air speed
Servos can be classified into different sizes as shown below:
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Based on the table our plane would use Standard size servos but we should still verify with calculations.