PPRuNe Forums - View Single Post - What causes "blowback/flapback" when accelerating through transverse flow effect?
Old 11th Aug 2022, 18:09
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HissingSyd
 
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Originally Posted by 212man
For the original poster, you may find this interesting reading - https://assets.publishing.service.go...elicopters.pdf (hopefully won't give some readers nightmare flashbacks!)
Well, not a nghtmare, but a huge flashback!

When I took over as CGI at Culdose in 1976, the available PoF teaching materials were "somewhat lacking in rigour" and I determined to to improve them. I gathered information from all the sources I could tap into and synthesised them into a set of class handouts. I was afraid that I might have over-stepped things a bit with the rigour, and some of the beefers of 705 Sqn were not too happy, either. When I left the job to go back to sea, I expected there would be a certain amount of watering down in the future.

In those days the AP3456 was quite a small volume and the Helicopter section quite brief, so it was largely ignored. Over the years I have come across some phrases and diagrams in various other publications that looked familiar, but I have never seen the later versions of AP3456.

Imagine my surprise, and gratification, when I followed the link and found huge chunks of the early chapters were verbatim from my handouts. Even most of the diagrams are [almost] photographic copies of my diagrams, with the labels [replicating those I] made with Rotring stencils.

There are revisions and interpolations, of course, and there may be some original errors, but it does seem to have stood the test of time pretty well. ;-)

Edited to clarify that, on closer inspection, the diagrams are not photographs. However, they are such close replicas that I was fooled at first.

Last edited by HissingSyd; 13th Aug 2022 at 07:28.
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