https://www.av8n.com/fly/lift.htm “is not moving not just left to right”. An aeroplane is not in a wind tunnel. The air is not moving.

By way of constructive counter-offer, a pilot-oriented explanation of how wings really work can be found at

http://www.av8n.com/how/htm/airfoils.html

For one thing, we notice that the air just ahead of the wing is moving not just left to right but also upward;

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CGP Customer Services <customerservices@cgpbooks.co.uk>;

Dear Emily Garrett. David Maliphant, Editors,

A1 A-Level Physics AQA pub. 2015

Theory of Flight.

I found you as the first two in the list of “Editors” of this book.

I was surprised to find that page 58 had the more accurate (2) theory of flight, using Newton’s second law. The air is thrown downwards.

Another A level book in the bookshop had the wrong (1) Bernouilli theory which I was taught during my Engineering degree in Cambridge Univ. in 1958, and accepted for 40 years.

I find on the www that MIT still teach Bernouilli, which is wrong because the air is stationary, only moving in a wind tunnel. Bernouilli might be viable, but only for theory of lift in a wind tunnel..

The Science Museum has no Theory of Flight. 20 years ago the Smithsonian, Washington DC, hedged its bets, giving both Bernouilli and Newton.

The two Americans who moved us from Bernouilli to Newton wrongly said there is nothing wrong with Bernouilli. Bernouilli might be viable, but only for theory of lift in a wind tunnel. It cannot work in stationary air.

All parties (1) and (2) have it wrong, thinking that an aeroplane is stationary and the wind moving, as in a wind tunnel. All their diagrams have arrows pointing from left to right, but the plane is moving from right to left.

What is the procedure for investigating the problem that children are being taught wrong theory (Bernouilli), and examined with marks going to the wrong answer? Under Bernouilli, a plane cannot fly upside down.

Ivor Catt

01727 864257

121 Westfields,

St Albans AL3 4JR

http://www.ivorcatt.co.uk/x68r.htm Here is the third theory (3). The correct one. It is about flight, not a wind tunnel.