Stearman build

Phil Ford
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17 Nov 2020 10:29 - 17 Nov 2020 10:30 #23685 by Phil Ford

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Strange how sometimes we think we are doing correctly and then a second look and think, "That's not right".

Sometimes we are able to recover from an error. I had a similar moment when drilling a firewall for an engine conversion.

Last edit: 17 Nov 2020 10:30 by Phil Ford.

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kevinross
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18 Nov 2020 21:22 #23702 by kevinross

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I had said -" I'm shying away from a sprung assembly" - Well my thoughts got the better of me so have fabricated a swinging arm. Next i have to figure out the springy bit.

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kevinross
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18 Nov 2020 21:23 #23703 by kevinross

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continued

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JonTappin
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18 Nov 2020 22:39 #23704 by JonTappin

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Lovely work Kevin!

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kevinross
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20 Nov 2020 20:05 #23712 by kevinross

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I know this Audi jargon has no bearing but this sounds appropriate

Tail sprung durch Technik !

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kevinross
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25 Nov 2020 17:17 - 25 Nov 2020 17:19 #23737 by kevinross

Replied by kevinross on topic Stearman build

Little space for large diameter elevator pushrods at the back end so made these using 4mm solid carbon.

Silver soldered these 3mm fittings inside brass tube. After cyno gluing, i drilled a couple of micro holes thru the brass wall then crimped a detent to prevent any future movement.

Last edit: 25 Nov 2020 17:19 by kevinross.

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Phil Ford
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26 Nov 2020 09:21 #23738 by Phil Ford

Replied by Phil Ford on topic Stearman build

Those Hitec servos HS55** are programmable for overload, ATV, reversible using a Hitec programmer. I have one if you need it Kevin.

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kevinross
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26 Nov 2020 09:36 #23739 by kevinross

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Phillip Ford wrote: Those Hitec servos HS55** are programmable for overload, ATV, reversible using a Hitec programmer. I have one if you need it Kevin.

Thanks Phil - I might take you up on that before project finished. Its not being mixed with another servo so my Tx will cover ATV and reverse but it has about twice the required torque and scale type structures dont have the strength of a 3D model.

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kevinross
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01 Dec 2020 14:01 - 01 Dec 2020 14:06 #23771 by kevinross

Replied by kevinross on topic Stearman build

Apparently, pilots don't do it standing up and need one of these. Scaled the drawings down to get the seat outline. Soaked the .5mm ply to form on these tubes overnight.