To overcome ineffective control surface problems in the transonic region
- an all moving tailplane may be used.
- hydraulically boosted elevators may be used.
- Frise type ailerons may be fitted instead.
Explanation from PART66Online
In the transonic region shock waves form ahead of hinged control surfaces, blanking them and greatly reducing elevator effectiveness. Moving the entire tailplane (an all-moving stabiliser) changes the whole surface incidence and so retains pitch control where a small trailing-edge elevator would be ineffective.
M
max.steelame asked · 24 Jan 2019
Please explain
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