Isometric Wings and Engine Nacelle Station Lines

TDT - Productivity solutions for tech illustrators.

A few months back I provided the following information on the C-47 Engine Stations.

76.500	117.375	156.500	191.000	203.500	258.500
103.000	136.500	177.500	192.500	222.500	Added 275.000

Stations run from front to back and are one of the three sets of dimensions we need. The others are that the Thrust Line (Vertical center of the engine) sits about centered on the wing Water Line and that the butt lines are 31.00 left and right. The last numbers we need are that the Prop has a radius of 69.5 inches (11.5 feet divided by 2) and sits horizontally and vertically on the thrust line at Station 103.00.

There are ribs at each Station Line and the Diameters can be seen in the table below:

Station	Rib Diameter	Our Dia.	Station	Rib Diameter	Our Dia.
76.500	Start 0.000	0.000	191.000	52.50	1.046
103.000	Hub 18.00	0.350	192.500	52.00	1.034
117.375	Cowl 45.00	0.900	203.500	49.00	0.967
136.500	62.00	1.225	222.500	45.00	0.900
156.500	62.00	1.225	258.500	42.00	0.839
177.500	61.00	1.209	275.000	Taper End 30.00	0.612

From the Taper end forward create in turn the 10 ribs (Our Dia.) you need by drawing a circle (constrain (Ctrl)). Convert the first circle to a curve (Ctrl+Q) and use the Node Edit Tool to add nodes. Use the Property Bar to correct the dimensions of each rib (Duplicate the ribs as you go) but be sure to work from back to front.

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