Will it fly? Sputnik/Odd-Ball Thing

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Aquaman33
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Will it fly? Sputnik/Odd-Ball Thing

Postby Aquaman33 » Sat Mar 09, 2019 6:22 pm

My youngest son wanted to make his "dragon's egg" fly.

So I have turned it into this Sputnik/Odd-ball style rocket.
Image

It weighs 50g including the parachute.

The egg is about 90mm tall and 70mm across at the widest part.

The legs made from 5mm styrene tube and are 245mm long.

I am thinking about flying it on an A or B motor, but I have no idea how to sim it.

It looks okay when I eyeball it, but that's not very scientific.

Does anyone have any experience with these things?

I could easily make the legs longer and/or thinker if required.

Cheers,

Derek

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Re: Will it fly? Sputnik/Odd-Ball Thing

Postby OverTheTop » Sat Mar 09, 2019 6:24 pm

Nice :)

Looks like it will be stable to me, but you may want some extra distance to the launch pad on the first flight just in case...
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Re: Will it fly? Sputnik/Odd-Ball Thing

Postby lorstin » Sun Mar 10, 2019 8:10 am

Don't see why not. Just ask the Kiwis.
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Re: Will it fly? Sputnik/Odd-Ball Thing

Postby Aquaman33 » Sun Mar 10, 2019 8:26 pm

Thanks for the feedback.

To be safe I added some 9mm diameter leg extensions. I think they will add a reasonable amount of drag.

I'll post a photo when its finished.

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Re: Will it fly? Sputnik/Odd-Ball Thing

Postby Aquaman33 » Thu Mar 14, 2019 12:59 pm

Photo of it finished with purple leg extensions.
Image

And the inside.
Image

Plenty of room for shock cord and a parachute.

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Re: Will it fly? Sputnik/Odd-Ball Thing

Postby Kryten » Sat Mar 23, 2019 8:55 am

Should be an interesting flight!
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Re: Will it fly? Sputnik/Odd-Ball Thing

Postby OverTheTop » Sat Mar 23, 2019 9:21 am

You could nick-name it "Spudnik".
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Re: Will it fly? Sputnik/Odd-Ball Thing

Postby Digit » Tue Apr 23, 2019 11:12 am

Should fly well. Sputnicks are even available as kits:
http://www.erockets.biz/oddl-rockets-fl ... t-sputnik/

What holds the two halves of the egg together? It would be a less than nominal flight if the top fell off prematurely.
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Aquaman33
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Re: Will it fly? Sputnik/Odd-Ball Thing

Postby Aquaman33 » Tue Apr 23, 2019 12:04 pm

The top just clips on the bottom part of the egg.

Its a really good fit.

I don't think it will come apart on the way up. I am more concerned about it getting stuck, but it has a very small volume so I think it will blow apart.

Hoping to fly it at our club meeting at the end of the month.

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Re: Will it fly? Sputnik/Odd-Ball Thing

Postby Aquaman33 » Sat Apr 27, 2019 4:59 pm

It flew!

It was reasonably stable on a B6-4.

Unfortunately the ejection charge caused some damage to the parachute. There is very little room inside the egg so the hot gases had nowhere to go. But I am hoping that some more strategically placed wadding will fix that.

Top half of the egg blew off as planned.

Image

Image

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Re: Will it fly? Sputnik/Odd-Ball Thing

Postby OverTheTop » Sat Apr 27, 2019 8:19 pm

Eggcelent! :D
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Re: Will it fly? Sputnik/Odd-Ball Thing

Postby SpaceManMat » Sun Apr 28, 2019 11:06 am

Go the Sput!
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Re: Will it fly? Sputnik/Odd-Ball Thing

Postby Aquaman33 » Fri May 03, 2019 10:09 pm

Inspired by the somewhat successful maiden flight of the Purple Egg and the flying Weber barbecue at Thunda I decided maybe I should build another sputnik.

One of my kids got a giant Kinder egg at Easter.

Image

Can you guess what I'm thinking?

Image

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Re: Will it fly? Sputnik/Odd-Ball Thing

Postby Kryten » Sun May 05, 2019 7:05 am

That's a perfect expression on his face for when you insert the motor
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Re: Will it fly? Sputnik/Odd-Ball Thing

Postby october sky » Sun May 12, 2019 8:12 am

Well done Aquaman 33 and Kryten....perfect comment there. :lol:

I once made while back a bubble maker into a rocket. Looked great and flew well but the motor melted the plastic slightly. Not the best material to have against the hot motor. If you can insulate it, no problems.
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