45 Using the above constant and 1.2 X VBL R. asthe twist we solve the following problems: 1. If a 1.80 EL R. is wanted on intermediate, whattwist gear should be used? VT80 = 1.341.Then 1.341 X 1.2 = 1.6092 twish per inch; and, constant 43.935 = 27.3 or 27 twist gear. twist 1.6092 2. If a 2 H. R. is… … DRAFT -AND TWIST DIAGRAMFIG. 19 Fig. 19 being a sketch of the Saco-Pettee fly frameusing an 8 x 4 inch bobbin the twist is found as fol-lows : Front roll 1% diameter, circumfer-ence = 1% X 3.1416 = 3.534. 130 X 39 X 53 X 44 = 2.0694 twist per inch. 3.534 X 71 X 30 X 33 X 23changegear Leaving out…
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