Practical Junk Rig: Design Aerodynamics & Handling
This encyclopedic quantity synthesizes 25 years of analysis and improvement of this exact rig as tailored to Western craft. it's a paintings that has been welcomed through the starting to be variety of yachtsmen and architects during the international who already benefit from the advantages of the junk rig or who desire to achieve this. Practical Junk Rig examines the layout and aerodynamic thought at the back of junk rigs and discusses how top to sail them. It outlines the rig intimately, the rules that underlie it, considers attainable substitute shapes and preparations and analyzes functionality, all assisted by means of a wealth of distinct line illustrations.
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Additional info for Practical Junk Rig: Design Aerodynamics & Handling
Eleven Parallelogram sail If the extensive finish have been bring to a halt alongside an arc DE (struck from centre B), the form ADEC should be advised because the form of a chinese language sail with equal-length battens, but if furled its battens could stagger unacceptably ahead, as proven, being managed by way of the sailcloth diagonals and not pivoting approximately centre B. to accomplish optimistic stagger at the leech of this sail it might be essential to modify the road of the luff and leech. those strains should be developed to be able to provide the mandatory stagger via the tactic proven in Fig. 2. thirteen. Having drawn the ordinary forty° x five° fan form (broken strains) from centre B, mark the increase CE as in Fig. 2. 12. Take pairs of compasses and set considered one of them to the size (X) of the growth CE and the opposite to the diagonal size Y that may be zero. ninety nine X. With centre C and radius y, lower the 1st rib of the fan at F, so one can be the ahead finish of batten 1. With centre F and radius X, mark the after finish of batten 1 at G. With centre G and radius y, mark the ahead finish of batten 2 at H. With centre H and radius X, mark the after finish of that batten at J. proceed this method up the sail to derive the form proven in Fig. 2. thirteen, with the recent backyard place at A2 D2 compared with the former backyard at (AD) (Fig. 2. 12). The ends of the battens are joined jointly through immediately strains to offer the luff and leech, as proven. This form could be defined as a 'staggered typical fan'. It has a little extra sector than the former sail and the sail panels get a bit of wider as they pass up. it's chanced on that the batten ends of this sail lie virtually, yet now not accurately, alongside arcs struck from a brand new centre B2 that is vertically above the fan centre B. there's a geometrical courting among distance BB2, distance BE, and the volume of batten stagger, yet this can now not be explored the following. it really is greater to depend upon the direct development utilizing lengths X and Y, that's acceptable to all shapes of sail. There are alternative routes of taking a look at Fig. 2. 12 and a couple of. thirteen and their shut dating with Fig. 2. nine and a pair of. eleven. by means of taking liberties with the language lets describe Fig. 2. 12 as a 'bent rectangle', and Fig. 2. thirteen as a 'bent parallelogram'. each one has consistent angles at either ends of every of its battens, as proven in Fig. 2. 14 and a couple of. 15. those angles offer one other clue to the several furling features of the 2 sails. The sail proven in Fig. 2. thirteen will be usable, even though its concave luff would have to be held firmly aft through luff hauling parrels as mentioned in bankruptcy three. In China, so much fanned sails have a immediately luff, and this definitely simplifies the layout if unequal batten lengths should be permitted. Fig. 2. sixteen, 2. 17, and a couple of. 18 express the sail from Fig. 2. thirteen transformed during this means, with a decision of 3 various instantly luffs. during this and all next sails the optimistic stagger on the leech has been maintained, leaving basically the matter of maintaining the backyard and battens at the mast while furled. Fig. 2. sixteen was once drawn via becoming a member of D2 and E The Geometry of the Sail Fig.