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3

Trimmable horizontal stabilizer (THS) and trim tab serve the similar purpose for two entirely different control architectures: Trim tab neutralizes the force on the pitch control for a reversible control system. THS neutralizes the pitch position (and, in the process, the force) for an irreversible control system (e.g. hydraulically/electromechanically ...


2

I've been around light airplanes for about 45 years and I've never seen a trimable stab and trimable elevator using a tab together. The closest I can come to that is the elevator trim bungee that is included with the jackscrew stab trim on the Piper Super Cub. The Super Cub has a moveable stabilizer that is the primary trim device, but also has a spring ...


1

It's unlikely that any airplane with a THS also has trim tabs. The benefit of adding them is slight (partial protection against failure of hydraulics), while the cost is extra mechanical complexity and extra drag. The extra drag is particularly important for airliners.


2

Thanks for @PeterKampf's answer and reference for the illumination. This is to complement the results drawn within its reference, which I don't think are completely accurate. As shown in Anderson, Fundamentals of Aerodynamics, the Newtonian theory is an ok first cut at hypersonic aerodynamics: due to the vast difference between the speed of sound and the ...


8

A converging shape at hypersonic speed in a low-pressure medium will produce close to vacuum pressure on its surfaces (hypersonic shielding). A small sideslip angle will only result in a very small pressure difference between both sides. Contrast this with a diverging shape which produces higher than ambient pressure on both sides. In hypersonic flow this ...


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