To save content items to your account,
please confirm that you agree to abide by our usage policies.
If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account.
Find out more about saving content to .
To save content items to your Kindle, first ensure no-reply@cambridge.org
is added to your Approved Personal Document E-mail List under your Personal Document Settings
on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part
of your Kindle email address below.
Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations.
‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi.
‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
It is a great honour to have been asked by The Royal Aeronautical Society to give the foundation British Commonwealth and Empire Lecture, and I have accepted, having in mind the Australian pioneers of the air from whose past has sprung the beginning of our Australian part in the common effort of to-day.
I would like to congratulate the Society on founding this lecture, which it takes little prediction to forecast will grow into one of the most important annual aviation events in the Empire–as well as facilitating the assembling together in the Journal of information, opinion and suggestion from the four corners of the Empire. This, in itself, is only made possible by air travel, and as an illustration of what can be done, you should know that this is my third visit to this country from Australia in this year of 1945.
The wind channel and the whirling arm have been devised and perfected over a period of a number of years with a view to providing reliable aerodynamic data for aircraft designers. Of late years the wind channel has been used considerably more than the whirling arm.
In the two pieces of apparatus distinct methods are used. In the whirling arm the model is carried through the air, which is stationary, in a circular path by a long arm. In the wind channel, on the other hand, the model is stationary and a current of air is caused to flow past it.
Various types of wind channel have been evolved, but I intend to describe fully the English wind channel in its present form, as perfected by the National Physical Laboratory and the Royal Aircraft Establishment, Farnborough.
My experimental work in flight refuelling goes back over a period of ten years, when I became interested in its possibilities as a means of removing the hazard' of a heavily loaded take-off. My idea was that an aircraft should have a normal and safe take-off, and that when it was comfortably in the air, it should receive its load of fuel, thus being given both an extended range and an increased1 pay-load.
In 1932, initial experiments were carried out on two D.H. 9's, and early in 1933, we continued experiments with a D.H.9 and a Handley Page W.iotransport machine.
At quite short notice I was asked to deliver this paper and told at the same time that I must make it popular and not adhere too much to technicalities. This makes it very difficult for me.