Fig. 21. Fig. 22.
Figs. 19–22.—Strut sections.
nothing more than a rectangle with the corners rounded off. [Fig. 20] shows a development of [Fig. 19] consisting of a semi-circular head with a cone-shaped tail, which by gradual evolution has resulted in the section [Fig. 21]. Some experiments carried out a considerable time ago by Lieut.-Col. Alec Ogilvy, revealed the rather interesting point that a strut shaped as in [Fig. 22] gave the same results as a similar strut taken to a fine edge. The reasons for the non-suitability of a sharp-pointed section are apparent from a consideration of [Fig. 23], showing the action of a side wind with the resultant dead air region.
Fig. 23.—Showing inefficiency of pointed section in a side wind.
Fuselage Struts.
Fig. 24.—Channel-section fuselage strut.
