# Chute Release

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#### Greg Furtman

##### Well-Known Member
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Does anyone else besides Jolly Logic make a chute release system?

#### mbeels

##### Yes balsa
TRF Supporter
There are a few flavors of "cable cutters" and "tender descenders". I think most of them are pyro based, I don't know of another electronic chute release system.

#### Wallace

TRF Supporter
Not that I'm aware of. But....It's not that difficult to fabricate one for use with an exsiting altimeter and an E match for less than a dollar. Just think in terms of melting through in lieu of releasing the rubber band/elastic thread. I've even made one that works with nichrome wire.

#### Jozef

##### Well-Known Member
Does anyone else besides Jolly Logic make a chute release system?
I am aware of any other source. I own two and have many flights on them. May I ask what is the nature of your question?

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#### ebruce1361

##### The man with the plan. And some duct tape.
I haven't yet lost much for electronic hardware with my rockets, but losing expensive stuff is always on my mind. As for the setup I'm thinking, it shouldn't be all that pricey. Like you said, the $20 Eggtimer would work perfect, and the lighter with battery would add maybe$2 and five or so grams. The setup in my head is a single box like the JL Chute Release attached directly to the parachute, so no additional wire to tangle or break, and the disconnect pin I mentioned could be as simple as a 1/8" headphone jack with a shorted plug that gets yanked out by the parachute.

It might be a bit over complicated, but I feel like it has the potential to be just as robust as the JL version, and could tangle less since the elastic is discarded entirely whereas the Chute release keeps it because you need that little pin. Also, I love to tinker, so the idea of building my own cheaper Chute release is appealing just from the standpoint of the challenge.

#### Greg Furtman

##### Well-Known Member
TRF Supporter
I haven't yet lost much for electronic hardware with my rockets, but losing expensive stuff is always on my mind. As for the setup I'm thinking, it shouldn't be all that pricey. Like you said, the $20 Eggtimer would work perfect, and the lighter with battery would add maybe$2 and five or so grams. The setup in my head is a single box like the JL Chute Release attached directly to the parachute, so no additional wire to tangle or break, and the disconnect pin I mentioned could be as simple as a 1/8" headphone jack with a shorted plug that gets yanked out by the parachute.

It might be a bit over complicated, but I feel like it has the potential to be just as robust as the JL version, and could tangle less since the elastic is discarded entirely whereas the Chute release keeps it because you need that little pin. Also, I love to tinker, so the idea of building my own cheaper Chute release is appealing just from the standpoint of the challenge.
eBruce, if you come with anything please post it. Thanks.

#### ebruce1361

##### The man with the plan. And some duct tape.
Will do! Between this and an electronic "insurance policy" for guaranteed cluster motor ignition I've been working on, looks like me and my soldering iron might be busy for the next few months!

BDB

#### Greg Furtman

##### Well-Known Member
TRF Supporter
Will do! Between this and an electronic "insurance policy" for guaranteed cluster motor ignition I've been working on, looks like me and my soldering iron might be busy for the next few months!
Fall will be here soon & then Winter, a time to catch up on indoor projects.

#### Wallace

TRF Supporter
And don't forget the pics...

#### ebruce1361

##### The man with the plan. And some duct tape.
Rough preliminary sketch teaser for ya!

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#### Wallace

TRF Supporter
Cool, now hurry up and build it!

#### BRS Hobbies

##### Well-Known Member
I thought it would be cool to have a consistent, slow opening parachute. Like it starts out as a drogue chute and then works it's way to a fully opened parachute.

#### ebruce1361

##### The man with the plan. And some duct tape.
I thought it would be cool to have a consistent, slow opening parachute. Like it starts out as a drogue chute and then works it's way to a fully opened parachute.
Sounds like you're referring to parachute reefing. It's done by having a string restrict how far the parachute can open at the bottom, and then cutting said string when the parachute is needed fully open. It's a classic technique that you see used frequently with landing rovers on Mars, and practically every parachute in Kerbal Space Program. If memory serves, Bama Chutes offer some reefing setups for model rocket chutes.

#### prfesser

Somewhere I've heard of running the shroud lines through a washer. The washer is shoved up to the shroud attachment points. On deployment the chute is largely reefed. As it falls, air catches the open parts of the chute and the washer slides down the lines for a slow opening. Never tried it myself, though.

#### ebruce1361

##### The man with the plan. And some duct tape.
Depending on how the parachute is packed, I'd think the washer would fall to the bottom of the lines before the parachute had a chance to open enough to hold the washer. Maybe something that can offer a bit more friction on the shroud lines like a used motor casing or scrap body tube section?

I think some experiments are in order!

#### 3stoogesrocketry

##### Well-Known Member
I've watched two rockets hit the ground under a streamered main chute because it was not falling fast enough to open . These sliders require velocity to open.

#### Wallace

TRF Supporter
Maybe a controlled reefing system instead of counting on it to conform to your will on it's own? Interesting concept, just not sure how practical it would be to make something that'd perform consistently. Looks like someone's been working on similar;

#### ebruce1361

##### The man with the plan. And some duct tape.
Going forward with my experiment.

I got and built an Eggtimer Quark, and bought two electric cigarette lighters. Turns out they are a bit more expensive than I thought (about $9 each), but not bad. Last night, I dismantled the lighters and ran a basic power test with the Quark. Good thing I bought both because one battery alone is enough to run the lighter, but barely powers the Quark. With both, the Quark is running on 7.4v, but I still had to isolate one of the batteries with a diode because the lighter refused to work (It must have a voltage regulator that disables the heating element if too much voltage is present. A smart safety feature.) I still have yet to incorporate a relay for the Quark to power to actually start the lighter and none of the safety disconnects are in yet, but I'm liking how this is turning out so far. I don't need an additional 9v battery like I originally thought, I can recharge the whole setup via USB, and the package looks like I can shrink it to much smaller than an Altoids tin. If I'm lucky, I can fit it all in a plastic$1 LED flashlight casing.

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#### Wallace

TRF Supporter
Lemme look into it...

#### Wallace

TRF Supporter
Video "should" work now..

#### DAllen

##### Well-Known Member
View attachment 390732 Nothing more than a nylon bushing drilled to accept an Ematch head. Thread the elastic cord through and tie it around your chute/blanket bundle. When match fires, it burns through thread and releases chute. Some have tried similar with fishing line but it lacks the springiness/release characteristics on burn through so won't always work. Works identical to Chute Release, just very slightly more difficult to set up. As you can see, I do own a Chute Release. What you can't see is that I did not pay \$129.99 for it since I bought it used. It's a neat little piece that seems to function as advertised.
I really like this idea but am curious, what do you think is the maximum chute size for this setup? And would you happen to have a picture of said chute wrapped in this manner? This and the nichrome idea are wonderful.

I've thought that something like this would be an interesting option where instead of bundling the chute with the elastic, make a cylinder to contain the chute. The cylinder would be split lengthwise and spring loaded - think fly-away rail guide kind of thing. The elastic would hold the cylinder shut and once the elastic is cut the cylinder springs open and releases the chute. I think this cylinder idea would significantly reduce the chance of tangles and would make it possible to use this elastic idea on larger chutes.