Drop away rail buttons

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air.command
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Drop away rail buttons

Postby air.command » Sun May 02, 2021 7:15 pm

At the most recent Whalan Reserve launch we tested a design for drop-away rail buttons. The idea was to create very low drag rail buttons for high performance rockets. The design also allows for easy adaptability for various guide rail profiles. The size we tested would most likely be good for up to L1 HPR, but you can easily scale the design for larger rockets.

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Legendontour
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Re: Drop away rail buttons

Postby Legendontour » Sun May 02, 2021 8:16 pm

Nice idea. Any guess as to the relative altitude gain or cda improvement over standard 1010 buttons?


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air.command
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Re: Drop away rail buttons

Postby air.command » Sun May 02, 2021 8:50 pm

Thanks. That's a really good question. I guess it depends on the particular rocket design, I can try running some sims to see what the difference would be. Gut feel is that it's a couple of percent difference in terms of overall drag coefficient.
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Aquaman33
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Re: Drop away rail buttons

Postby Aquaman33 » Sun May 02, 2021 9:38 pm

I love this concept and I am looking forward to trying it in the near future.

I guess the next evolution would be a rail guide with the metal piece attached and some sort of "socket" built into the body tube, so that when the rail guide drops off there is nothing left on the rocket except a thin slot.

But the socket would intrude into the body tube.

air.command
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Re: Drop away rail buttons

Postby air.command » Sun May 02, 2021 10:15 pm

Was thinking the same. Just turn the bracket and slot the other way around, but as you said it would protrude into the body tube, but in a lot of instances that may be acceptable. I think if you were to then completely print the button without using any metal, the slot would have to be wide enough for the button to have enough strength.
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markf74
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Re: Drop away rail buttons

Postby markf74 » Sun May 02, 2021 10:33 pm

Love this innovative idea , I'm with Aquaman , cant wait to try it !!
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Aquaman33
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Re: Drop away rail buttons

Postby Aquaman33 » Mon May 03, 2021 8:01 am

air.command wrote:Was thinking the same. Just turn the bracket and slot the other way around, but as you said it would protrude into the body tube, but in a lot of instances that may be acceptable. I think if you were to then completely print the button without using any metal, the slot would have to be wide enough for the button to have enough strength.


You seem to be able to retrieve the rail buttons quite easily, so you could epoxy the metal piece into the 3d printed rail guide......and be quite confident that you will get it back.

I think that would work better than having a big slot in the rocket and an entirely 3d printed button.


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