Rocket-based ejection system

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James Harrison - 22 Jan 2010 23:50 GMT

Hi all,

Is it possible to purchase engines that only have the ejector/igniter
component? I'm looking for a zero-downthrust system to eject a
parachute from a UAV should a system failure occur in flight.

Any tips on the details of the system would also be appreciated;
this'll be my first (as you might imagine...) though I have model
rocketry experience, hence my turning to the same crowd and tech...

Cheers,
James

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Joe Pfeiffer - 23 Jan 2010 00:41 GMT

> Hi all,
>
[quoted text clipped - 5 lines]
> this'll be my first (as you might imagine...) though I have model
> rocketry experience, hence my turning to the same crowd and tech...

Not exactly, but there are electrically actuated black powder ejection
systems used in high power rocketry. I don't have any URLs handy, but
try some HPR sites.

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As we enjoy great advantages from the inventions of others, we should
be glad of an opportunity to serve others by any invention of ours;
and this we should do freely and generously. (Benjamin Franklin)

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N3 - 23 Jan 2010 19:28 GMT

> > Hi all,
>
[quoted text clipped - 13 lines]
> be glad of an opportunity to serve others by any invention of ours;
> and this we should do freely and generously. (Benjamin Franklin)

Check http://www.newtons3rdrocketry.com/shop

Prewired ejection canisters.

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Bob - 24 Jan 2010 13:11 GMT

> Is it possible to purchase engines that only have the ejector/igniter
> component? I'm looking for a zero-downthrust system to eject a
> parachute from a UAV should a system failure occur in flight.

There are commercial parachute deployment systems available for this
function. I don't know what size motor they use, but it's in the mid
to HPR range. They may even be reloadable. I don't know that a simple
ejection charge would be large enough, unless you're talking about a
very small UAV.

Take a look at http://brsparachutes.com/

People have also used model rocket motors as ejection systems for
larger rockets.

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Model Forum / General / Rockets / January 2010

Rocket-based ejection system