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Stuart Grasshopper Engine

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BOB BLACKSHAW	01/01/2022 17:16:49
501 forum posts 132 photos	Hello all, Ive got the drawings for a Stuart Grasshopper Engine and I am to make this at .65 scale of the drawing. I have a nice cast brass flywheel at 41/2 inches diameter so thats why Im doing it at .65 scale. My question is the drawing of the beam is a cross section and does not show the width of the beam. Has anyone got a measurement of the full scale beam width, I got a rough idea but the yokes that fit inside , if I make it a bit big it could hit them when the piston moves up and down. Thanks Bob
JasonB	01/01/2022 18:54:57
25215 forum posts 3105 photos 1 articles	Bob as it uses the same beam casting as the other beam engine I would think it fair to assume they are the same which is 3/8" for the end and linkage bosses and 1/2" for the central one
BOB BLACKSHAW	02/01/2022 08:25:17
501 forum posts 132 photos	Thanks Jason, I have that measurement , but it's the beam width from the middle, the actual size of the beam only. Thanks Bob
JasonB	02/01/2022 10:04:31
25215 forum posts 3105 photos 1 articles	Sketch on a drawing and post a pic of the dimension you want. I'll measure my beam
BOB BLACKSHAW	02/01/2022 10:15:32
501 forum posts 132 photos	Thanks Bob
JasonB	02/01/2022 10:24:47
25215 forum posts 3105 photos 1 articles	Bit tight to get the callipers in but I'm getting 39mm though could well be 1.5" End radius is 3/8"
BOB BLACKSHAW	02/01/2022 12:49:30
501 forum posts 132 photos	Very much appreciated Jason. I intend to fabricate it rather than one piece. Bob

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