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New idea for fin-stabilazed ammo?

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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New idea for fin-stabilazed ammo?

Unread postAuthor: Alex345 » Sat Aug 11, 2018 6:08 pm

I have just ordered a piece of aluminum profile tubing that has a shape for which i've been looking for a while:
Xporfile.1.jpg
Xporfile.1.jpg (18.7 KiB) Viewed 377 times


I was thinking of cutting like 2cm long pieces of this piece and attach those to a piece of wire rod to serve as 8 mini fins. Wonder if this would be accurate? If the projectiles can be easily made consistently.

round.2.png
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Alex345
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Re: New idea for fin-stabilazed ammo?

Unread postAuthor: jackssmirkingrevenge » Sun Aug 12, 2018 6:12 am

Very interesting find!

With regards to your projectile design, I'm not sure it would work as-is, you probably need the tail portion to be longer - basically the sharp angle at the rear of the front mass will probably not allow enough air to flow over the fins for them to be effective.

Have a look at the M830 120mm tank round for example:

Image

That taper on the end is going to smooth the airflow and enable the fins to stabilize the projectile.

Russian 125mm shells with a similar blunt profile also feature spring-out fins that extend past the caliber diameter to be effective:

Image
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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jackssmirkingrevenge
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Re: New idea for fin-stabilazed ammo?

Unread postAuthor: Alex345 » Sun Aug 12, 2018 5:29 pm

Thanks for the input! I'll keep a design in mind with a longer tail section and where the body of the round tapers down to the piece if wire rod that holds the fins in place :)

These also look good for making some folding fins too!
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Re: New idea for fin-stabilazed ammo?

Unread postAuthor: jackssmirkingrevenge » Sun Aug 12, 2018 6:44 pm

Can you link to where you found it?

I think something like this would also work very well:

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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: New idea for fin-stabilazed ammo?

Unread postAuthor: Alex345 » Wed Aug 29, 2018 11:22 am

Sweet! What is that? Reminds me of a heatsink but i'm lost as to why it has a hole in the middle tho... It came from an event company in The Netherlands, so shipping was doable.

https://www.fritz-events.nl/adam-hall-a ... l-7mm.html

Just got back from vacation so i'm gonna clean up my workspace a bit and try and wrap my mind around this projectile i'm building, as i'll be trying thin cut pieces as fins for small cal projectiles, but i'm also working on one with deploying fins for a bigger cannon.
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Re: New idea for fin-stabilazed ammo?

Unread postAuthor: Alex345 » Sat Sep 01, 2018 7:59 pm

Some messing around...

40654326_320354475382707_4268847156036632576_n.jpeg
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Re: New idea for fin-stabilazed ammo?

Unread postAuthor: jackssmirkingrevenge » Wed Sep 19, 2018 8:16 am

Looking good!

Reminds me of a heatsink but i'm lost as to why it has a hole in the middle tho


Yes it's a heatsink, amazing how many different designs there are if you look around.
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Re: New idea for fin-stabilazed ammo?

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