Collapsing Hose Deployment Gadget

[RebelRockets]

Hi everybody,

First of all, this was inspired by the thread "100% reliable parachute deployment" by Frank and my probable misunderstanding of a "crushing sleeve" staging device.

This sort of works like the inverse of Frank's idea. Instead of an external expanding bladder, this uses pressure inside the bottle to collapse the bladder and create the grip.

Drill a hole in the bottom of a bottle like you would for installing a Robinson style coupling. You will need the same hardware for the coupling, only a slightly longer piece of lamp rod than usual. You will also need some latex rubber hose that is 1/4 inch i.d. and 3/8 o.d., and something to plug the hose.

Force the end of a piece of latex rubber hose over what will be the inside end of the coupling. Wrap it with some small wire as a clamp. Put a plug in the opposite end of the hose and wrap the plug end with wire to clamp it.

Feed the assembly through the neck of the bottle and install the coupling sealed tight in the drilled hole. The length of latex hose should be inside the bottle.

Apply a little air pressure to the bottle and watch the latex hose collapse flat. Release all the pressure and then insert a 1/4 inch sanded wooden rod through the outside end of the coupling. It should be a close fit but easily fall back out without hanging up. Pressurize the bottle again and the wooden rod will be tightly gripped by the latex hose until all pressure is released.

If you compress a spring or stretch rubber bands when you push down the wooden rod and temporarily hold it in place until the rocket is partially pressurized, the rod can push off a nosecone or deploy a parachute when the rocket has lost pressure.

I hope someone can use this.

Dennis

[Lasheyda]

This a simplified version of the crushing sleeve deployment mechanism...

Usually there is a one-way valve on the end of the latex hose and the wooden dowel is a plastic tube (the nozzle for the sustainer.)

Sounds like a good way to deploy a parachute/streamer the only problem is that it would deploy the parachute as soon as the pressure is gone,which is fine on a booster, but since most of the rockets assent is a free-coast (burnout happens just a few feet above ground) you would have to figure out how to delay the deployment...

[U.S. Water Rockets1]

This a simplified version of the crushing sleeve deployment mechanism...

Usually there is a one-way valve on the end of the latex hose and the wooden dowel is a plastic tube (the nozzle for the sustainer.)

Sounds like a good way to deploy a parachute/streamer the only problem is that it would deploy the parachute as soon as the pressure is gone,which is fine on a booster, but since most of the rockets assent is a free-coast (burnout happens just a few feet above ground) you would have to figure out how to delay the deployment...

In his video of this system he had used a tiny hole to drain off the air pressure which acted as a delay for the deploy. It did not deploy when the pressure was gone because he had a small buffer with the tiny drain hole for delay.