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LOHAN'S PRATCHETT mission set to soar Saturday

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make it good

I'm preparing my very best "Woooo!"

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I probably missed it..but..

Why are you using 4 servos, when 2 or 3 would do? I don't see anything for ailerons, so you wouldn't need a servo for those. Could you go into more detail on the mechanical linkages for the flying surfaces?

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Re: I probably missed it..but..

Each canard has to have an individual servo, which is connected via pushrod: http://www.theregister.co.uk/2014/06/20/vulture_canard_woes/?page=2

The wingtip rudders could conceivably operate off of single servo, but the connections would be a nightmare. There's a single servo mounted in each wing, connected to its respective rudder by a Gold-N-Rod system.

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Re: I probably missed it..but..

Thanks for posting the link. I had missed that article. So the canards are used for pitch and roll, with software doing the mixing?

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(Written by Reg staff) Gold badge

Re: Re: I probably missed it..but..

Correct. The Pixhawk takes care of the pitch/roll attitude, using the two canards independently.

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It's got to be a million-to-one chance

because million-to-one chances crop up nine times out of ten.

Sorry, couldn't resist. Fingers crossed for a perfect Pratchett project performance!

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God(s) Speed...

And may you have a potent voyage!

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Remove Before Flight

That Remove Before Flight ribbon is missing something.... the Reg logo. There's a Cash'n'Carrion idea for a key fob :-)

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Re: Remove Before Flight

I like that.

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Presumably there will be a Playmobil character dressed as Rincewind.

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Joke

There was, but he heard about the mission and ran away...

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Still think the layout is flawed

In the real LOHAN the servoes will be much more exposed, with only a thin bit of nylon separating them from the cold (and possibly some seems to let cold air blow in). In the PRATCHETT payload the servos and batteries are mounted inside a nice insulated box, so will stay warmer because of that.

Ofcourse I hope I'm wrong, and in any case it'll provide valuable data.

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Re: Still think the layout is flawed

Arghhh, for seems, read seams.

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