Stuart Grasshopper Engine

This topic has 7 replies, 2 voices, and was last updated 2 January 2022 at 12:49 by BOB BLACKSHAW 1.

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1 January 2022 at 17:16 #33940
BOB BLACKSHAW 1
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@bobblackshaw1
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1 January 2022 at 17:16 #577950
BOB BLACKSHAW 1
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@bobblackshaw1
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
1 January 2022 at 18:54 #577970
JasonB
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@jasonb
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
2 January 2022 at 08:25 #578021
BOB BLACKSHAW 1
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@bobblackshaw1
Thanks Jason, I have that measurement , but it's the beam width from the middle, the actual size of the beam only.

Thanks Bob
2 January 2022 at 10:04 #578032
JasonB
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@jasonb
Sketch on a drawing and post a pic of the dimension you want. I'll measure my beam
2 January 2022 at 10:15 #578037
BOB BLACKSHAW 1
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@bobblackshaw1
Thanks Bob
2 January 2022 at 10:24 #578039
JasonB
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@jasonb
Bit tight to get the callipers in but I'm getting 39mm though could well be 1.5"

End radius is 3/8"
2 January 2022 at 12:49 #578082
BOB BLACKSHAW 1
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@bobblackshaw1
Very much appreciated Jason. I intend to fabricate it rather than one piece.

Bob
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Stuart Grasshopper Engine

Stuart Grasshopper Engine

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