The Problem of Manflight

The Problem of Manflight

The Problem of ManflightAs the century draws to its close the interest in the subject of aeronautics...
Dhs. 24.89 AED
Dhs. 49.80 AED
Dhs. 24.89 AED
SKU: gb-56249-ebook
Product Type: Books
Please hurry! Only 10000 left in stock
Author: Means, James,1853-1920
Format: eBook
Language: English
Subtotal: Dhs. 24.89
10 customers are viewing this product
The Problem of Manflight

The Problem of Manflight

Dhs. 49.80 Dhs. 24.89

The Problem of Manflight

Dhs. 49.80 Dhs. 24.89
Author: Means, James,1853-1920
Format: eBook
Language: English

The Problem of Manflight

As the century draws to its close the interest in the subject of aeronautics steadily increases. There already exists a keen curiosity to know what the aerial machine of the future is likely to resemble, and also to know whether the nineteenth or the twentieth century will claim it for its own. In the present article the writer wishes to show what inferences may be drawn from the laws of nature as so far ascertained by observation and experiment, and he wishes also to point out a way which may lead to further progress. The investigators of this subject are now divided into two camps: on the one side there are men who, like Mr. Maxim, are endeavoring to construct machines which will carry motors and therefore be self-propelling; on the other side there are men like Mr. A. M. Wellington, who maintains that a motor is unnecessary and that wind-power is sufficient. In the New York Engineering News, of Oct. 12, 1893, Mr. Wellington, in a very interesting article entitled The Mechanics of Flight, makes the following statement: If the conclusions so far reached in this paper be accepted, it is obvious that they greatly simplify the problem of artificial flight by reducing to a minimum the demand for power, making it chiefly necessary for acquiring the first initial velocity. All attempts at aviation which include any motor for propulsion[4] are, in my judgment, on wrong lines, and predestined to certain failure, since they not only neglect, but destroy, the action of the forces by which true flight may be and is attained. I will not go so far as to say that some (soaring) birds, in the exuberance of power, may not use the wings to accelerate, as they do to retard motion. I think they do, but only in an abnormal way; it is wholly unnecessary, and even destructive of all normal flight. The fish needs a propeller, because it has no gravity in water; the bird does not need it, because it has gravity, and in that gravity has the best and smoothest of all conceivable means of propulsion, if he can make the wind lift him uphill whenever he has slid far enough downhill. If so, man commits an absurdity when he flies in the face of nature and assumes a propelling force where none is needed or exists. ......Buy Now (To Read More)

Product details

Ebook Number: 56249
Author: Means, James
Release Date: Dec 24, 2017
Format: eBook
Language: English

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Shipping

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Related Products

Recently Viewed Products