The Simon Harbord Silly Putty (SP) rig

Looking at what will work for a KAP community project the simplicity of Simon Harbord’s rubber band powered AutoKAP rig looks appealing:

This thing is going to need testing and, because I expect it to be flown from a relatively small kite ( I have 1.6, 1.5 and 1.3m rokkakus lined up for testing)  I’m holding off cutting tin until I have assembled all the parts but I have questions about it that are hard to find answers for:

How long will it run?

How big a rubber band?

How heavy will it be?

What sort of interval should I set the intervalometer for?

Can I get a class of children to assemble it with out a rubber band pinging war breaking out?

Why is ‘Silly Putty’ now only available as expensive ‘Science Putty’ and what does this tell us about the nature of science today?

Will the tilt gear be too difficult to make?

Will a fixed tilt design be a better bet?

What will the image cover be like with a constant shift in pan and tlit?

Only one way to find out: build it and see!

B

About billboyheritagesurvey

Heritage worker
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One Response to The Simon Harbord Silly Putty (SP) rig

  1. Simon H 1:33PM
    Looks familiar! I can answer most of your questions on the rig Bill. Your link took some cutting and pasting to work.

    How long will it run? Depends on the number of turns, the strength of the elastic and the viscosity of the putty. I aim for about ten turns over a ten minute flight with shots about every 4 seconds.

    How big a rubber band? Camping shops, yellow tent peg bands are the best. The red bands the posties use are Ok if you use two at a time.

    How heavy will it be? Pretty light just a couple of ounces.

    What sort of interval should I set the intervalometer for? 4 to 10 seconds.

    Can I get a class of children to assemble it with out a rubber band pinging war breaking out? Hmmm. That’s one for you.

    Why is ‘Silly Putty’ now only available as expensive ‘Science Putty’ and what does this tell us about the nature of science today? You should find it in toy shops in egg shaped containers.

    Will the tilt gear be too difficult to make? For kids, I wouldn’t bother, just use presets.

    Will a fixed tilt design be a better bet? Yes

    What will the image cover be like with a constant shift in pan and tlit? Can be pretty damned good.

    Only one way to find out: build it and see!
    I agree.

    Simon

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