BWB flight control

Philip. G. Pugh

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BWB flight control

机译：BWB飞行控制

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Further to Mr Crawford's and Mr Byrom's letters in the February 2008 Aerospace International p 31, a reminder of some engineering fundamentals appears to be apposite. To Mr Crawford I would observe that, however capable flight control systems have become, basic kinematics must prevail. The only way in which to limit excess linear accelerations of passengers remote from the centre of gravity is to restrict angular acceleration of the aircraft in roll. In turn, that must reduce the capacity of the aircraft to initiate manoeuvres as compared to current standards - an obviously undesirable outcome. As for Mr Byrom's concerns, what he has sketched is not an unstable (cartwheeling) aircraft but a stable configuration subject to a nose-down pitching moment due to displacement of the line of action of thrust from that of drag. Given any reasonable ratio of (maximum) lift to drag, cartwheeling is not a possibility. Concern about possible large trim drag in some regions of the flight envelope may be valid, however.

机译：继克劳福德先生和拜伦先生在2008年2月国际航空航天学会第31页的信中提到的某些工程基础知识似乎是合适的。对于克劳福德先生，我将观察到，无论多么强大的飞行控制系统已经成为基本运动学。限制远离重心的乘客的多余线性加速度的唯一方法是限制飞行器在侧倾时的角加速度。反过来，与目前的标准相比，这必然会降低飞机启动机动的能力，这显然是不希望的结果。关于拜伦先生的担忧，他所勾画的不是不稳定的飞机，而是由于推力作用力相对于阻力作用力产生位移而承受俯仰力矩的稳定构型。给定（最大）升力与阻力的任何合理比例，翻车是不可能的。但是，对于在飞行包线的某些区域中可能出现的大的纵倾阻力的担忧可能是有效的。

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《Aerospace international》 |2008年第4期|p.34-35|共2页
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Philip. G. Pugh;
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BWB flight control

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