After some experiences with small models, tail as a whole appears a critical area especially for small sizes.
This is due to vibrations issues, but also mechanically, as traditional boom design poses some concerns.
First of all, the traditional round tubes and tail braces design result unnecessarily robust and thus heavy and below certain thicknesses and sizes it is not practical to go.
Tail boom braces are prone to vibrations, so often pilots have to further add vib suppressors to control them.
Round tube are quite cumbersome for tail precise mounting, as well as manufacturing of CNC tail box and tail clamps; often torsional displacement might occur, impairing quick tail boom replacement or precise mounting.
The Designers strongly wanted to eliminate tail boom braces from Oxy design: to reduce weight and inertias improving the dynamics, to improve the silhouette, and control overall purchase and maintenance costs.
Some basic studies were carried out to ascertain the real strength required in flight conditions to tail boom; the outcome of these analysis lead to understand that inertial accelerations (and thus forces on the boom) are quite higher on the elevator roll plane, than those relevant to yaw, which are tail driven thus controlled and dampened by tail gyro.
So, choosing an asymmetrical tube was the logic conclusion: stronger on the elevator axis, and reduce the size in the other direction: the result is the peculiar rounded-rectangular shape your can appreciate on Oxy.
In addition to that, among other possibilities, that specific shape was selected as the overall tail box design result much rational and lighter than the rounded tube, leading to further area of improvement in tail designs.
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