Jolly logic and drogue on single deploy?

[rsbhunter]

Ok, this might be totally foolish...I am building a Madcow DX3 2.6" . The area I launch is good size, but not enormous, so, is it possible to use a 12"-15" regular chute, and still use a 24"-36" chute on the shock cord with a Jolly Logic? The area I fly is pretty hard pack soil/rock, and I'd like to have the big chute deploy at around 150 yards...or is that cutting it to close? Thanks for any help, I'm getting back into this after many , many years.?lots of cool new stuff..?rsbhunter

 

[rcktnut]

I just use the biggest chute protecter I can in a certain sized rocket and that keeps the parts separated nicely and then just use the JLCR on the main chute. I've never seen a need for a drogue chute at all. A drogue will just keep it in the air that much longer. It could be done if you wish. Deploying at that altitude should be fine.

 

[Scott_650]

I use a streamer with my JLCR - streamer first, of course. So far that combo has worked well for me.

 

[rsbhunter]

It's great to have options...Thanks to all

 

[Handeman]

I have a 2.2" PML Callisto I use a JLCR with. I usually use 200 ft. but will drop it to 100 ft. if I want to mess with the LCO some. It is farm fields so it's pretty soft landing. I don't use any drogue chute. The main chute with the JLCR acts as all the drogue I need. The rocket comes down fin first very fast. The chute and JLCR is up and the nose cone tends to float around, but stays below the chute.

 

[dr-ws]

Ok, this might be totally foolish...I am building a Madcow DX3 2.6" . The area I launch is good size, but not enormous, so, is it possible to use a 12"-15" regular chute, and still use a 24"-36" chute on the shock cord with a Jolly Logic? The area I fly is pretty hard pack soil/rock, and I'd like to have the big chute deploy at around 150 yards...or is that cutting it to close? Thanks for any help, I'm getting back into this after many , many years.?lots of cool new stuff..?rsbhunter

Welcome back, from this B.A.R. (Then: 1973(?). 'Now': 2016(?).)
"Lots of cool new stuff": I've only begun to learn just how much, with new cool stuff every day, almost!
Best wishes, if you're about to try L1/L2 cert.! (JL 'Chute Releases are great, but please don't skip the 'shake test', etc., that John Beans recommends with each use.)

 

[Spitfire222]

If your concern is recovery in a small field, then a drogue chute is the opposite of what you want, since like Jeff mentioned, it will slow the rocket's descent from apogee. Skip the drogue and just use the JLCR on the main.

 

[rsbhunter]

I'm leaning towaed the JL and chute combo..I've had rockets come down with the chute still wrapped, and survive. Not that the wallet is self refilling, but as far as hobbies go, this is still reasonable, as long as I stay with the mpr. God help me if I ever get L1 certified!!!! rsbhunter

 

[darrenf]

I have a 2.6" PML Callisto I use a JLCR with. I usually use 200 ft. but will drop it to 100 ft. if I want to mess with the LCO some. It is farm fields so it's pretty soft landing. I don't use any drogue chute. The main chute with the JLCR acts as all the drogue I need. The rocket comes down fin first very fast. The chute and JLCR is up and the nose cone tends to float around, but stays below the chute.

Isn't the Callisto 2.2"?

 

[Capt. Eric]

I have used a drogue plus a JLCR on occasion. Usually when I'm looking at a high-ish altitude (maybe 1200ft or more), with a low opening (300ft), but I want to make sure the nose cone stays away from the body. The drogue helps stabilize the freefall a little. Also slows it down slightly so opening isn't too dramatic. Typically like for my King Kraken. I've also used the streamer like Scott said.

I'm sure you'd be fine either way, so give it a try. Just make sure you pack it all neatly.

 

[dr-ws]

I'm leaning towaed the JL and chute combo..I've had rockets come down with the chute still wrapped, and survive. Not that the wallet is self refilling, but as far as hobbies go, this is still reasonable, as long as I stay with the mpr. God help me if I ever get L1 certified!!!! rsbhunter

As our club officer Carl says [upon successful L1/L2 achievement], "Welcome to high power rocketry.
Now open your wallet!"

Isn't the Callisto 2.2"?

Yes. (As a LOCPrecision/PML kit.)

 

[Sooner Boomer]

I've flown a *lot* with a JLCR. The only reason I've ever used a drogue was for visibility on a really high flight. I stuck one end of a crepe paper ribbon under the loop of the JLCR. It opened and unfurled on ejection, then was released when the JLCR released.

 

[Lord Rory Gin]

I use a streamer with my JLCR - streamer first, of course. So far that combo has worked well for me.

The streamer option is great for tracking visibility as well as slowing the rocket to a moderate descent.

 

[Scott_650]

The streamer option is great for tracking visibility as well as slowing the rocket to a moderate descent.

Exactly my goal and it’s worked well.

 

[Handeman]

Isn't the Callisto 2.2"?

Yes, I believe it is. edited...

 

[Ron Soto]

If your concern is recovery in a small field, then a drogue chute is the opposite of what you want, since like Jeff mentioned, it will slow the rocket's descent from apogee. Skip the drogue and just use the JLCR on the main.

"Skip the drogue and just use the JLCR on the main."

this is how i fly my single 'chute rockets. simple and configurable in rocksim. (LOC Athena, Apogee Zephyr, and my new LOC Zeus will be outfitted that way). i have my 'chute open at 400'.. so basically deployed at ~320'. works great...

it'll take at least 50' to deploy a 'chute.. so be careful how low your setting the JCLR.

r-

 

[rsbhunter]

Ron, I was going to ask the average distance between release and fully open...that answers that question....Thank you! rsbhunter

 

[Voyager1]

Ron, I was going to ask the average distance between release and fully open...that answers that question....Thank you! rsbhunter

Time/distance from release to fully open might depend on your packing technique. I tend to prefer chute and cord folding, rather than wrapping the cord around the chute/Nomex blanket burrito.

 

[rsbhunter]

Time/distance from release to fully open might depend on your packing technique. I tend to prefer chute and cord folding, rather than wrapping the cord around the chute/Nomex blanket burrito.

Yes, with the JL, I fold chute , get all lines together, fold chute, lay lines up and then down, fold chute either in half, or a z fold. Depends on diameter of body tube. Going to try the JL for the first time in a couple days...rsbhunter

 

[dr-ws]

Yes, with the JL, I fold chute , get all lines together, fold chute, lay lines up and then down, fold chute either in half, or a z fold. Depends on diameter of body tube. Going to try the JL for the first time in a couple days...rsbhunter

And once again, please heed Mr. Beans' instructions that accompany the JLCR: "perform a 'shake test' every time", etc., and (a stupid mistake made once early on my me!) DON'T FORGET TO TURN IT ON BEFORE LAUNCH! I've heard too many times, "My Chute Release didn't work." When it doesn't, it is almost always our fault - this is a very well-designed, well-made device!

 

[rsbhunter]

So true...I am trying to do everything I can to remember to test it...rsbhunter

 

[Art Upton]

Yes, with the JL, I fold chute , get all lines together, fold chute, lay lines up and then down, fold chute either in half, or a z fold. Depends on diameter of body tube. Going to try the JL for the first time in a couple days...rsbhunter

Watch Bean's JL Video and fold it that way in the instructions. When I just folded it the way I always fold a chute I got a dented test rocket, twice. Then I watched the video and it worked.

 

[Capt. Eric]

And once again, please heed Mr. Beans' instructions that accompany the JLCR: "perform a 'shake test' every time", etc., and (a stupid mistake made once early on my me!) DON'T FORGET TO TURN IT ON BEFORE LAUNCH! I've heard too many times, "My Chute Release didn't work." When it doesn't, it is almost always our fault - this is a very well-designed, well-made device!

I forgot to turn it on once, but the rocket survived anyway. Now I usually stick a piece of painters tape on the NC to remind me turn it on.
On another occasion it "failed" and I know I turned it on. My best guess is that in stuffing the chute and shock cord in, its button must have gotten depressed. I try more consciously to keep it clear of that stuff now. But I really like it, recommend them, and couldn't launch my larger, higher rockets in our smaller field without it.

 

[dr-ws]

I forgot to turn it on once, but the rocket survived anyway. Now I usually stick a piece of painters tape on the NC to remind me turn it on.
On another occasion it "failed" and I know I turned it on. My best guess is that in stuffing the chute and shock cord in, its button must have gotten depressed. I try more consciously to keep it clear of that stuff now. But I really like it, recommend them, and couldn't launch my larger, higher rockets in our smaller field without it.

Mine survived also, by the grace of God [and the 'streamer effect'], but learned my lesson, as it were.
Is it possible your other failure was due to inadequate charging? (I do understand about the possible button depression.)
I, too (obviously), love these devices! So do my 68 year old knees. . .

 

[Capt. Eric]

Mine survived also, by the grace of God [and the 'streamer effect'], but learned my lesson, as it were.
Is it possible your other failure was due to inadequate charging? (I do understand about the possible button depression.)
I, too (obviously), love these devices! So do my 68 year old knees. . .

No, it was charged the night before, and it worked afterwards. Just ground crew error.