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Fin/Rudder sizing

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Major Carnage

New Member
Joined
May 4, 2021
Messages
2
I want to build a U/L aircraft under the LSA (Canadian) rules, as I am a heavier pilot, and the LSA regs. allow for more "aircraft" (i.e. a more robust structure). I have decided on a plans built aircraft with proven airworthiness qualities. It is perfect for my needs, except (isn't there always an "except") for the tail shape. The design appeals due to it's similarity to an actual full-size aircraft. In order to maximize this similarity, the tail feathers would need to be a more rounded shape. I haven't run this through any design software yet, but here is my 'design' rationale:
Provided that:
1) The rudder hinge line distance from the main wing mean chord line stays the same (no increase/decrease in moment arm)
2. The surface area of the vertical fin and rudder remain the same
3. The ratio of rudder to fin surface area remains the same
4. The airfoil shape remains the same
5. The location of the rudder hinge line in reference to the horizontal stabilizer/elevator hinge line stays the same
6. The weight and balance remains relatively the same

Then I shouldn't get into too much trouble. The same is true of the horizontal stab and rudder, provided that all the above criteria are followed.

What do you guys think? I invite input from all of the aerodynamicists, both amateur and professional. Is my thinking on the right track?
 
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