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  1. #61
    Join Date
    19th January 2009
    Location
    Stafford VA
    Posts
    6,953
    I had my L3 before I considered getting a JLCR. I've gotten two so far (first was lost when the motor eject fired at motor burnout). They work great!

    The only problem with the JLCR is that they are very, very, very expensive! It's not the cost of the JLCR, it's the cost of the bigger motors you can now fly in conditions you wouldn't have done before!

    With the JLCR, instead of a $14 G64W, I'm flying the $20 H128W or $24 H180W. This thing is going to make me go broke!

    Handeman

    TRA #09903 L3 3/29/2015

    "If you don't use your head, you have to use your feet!" my Dad

    Tripoli Central Virginia #25 - BattlePark.org

  2. #62
    Join Date
    27th December 2014
    Location
    Seattle, WA
    Posts
    773
    L2 February 2017
    Madcow Arcas 2.6" fiberglass kit, approx. 1950g
    CTI J285 to about 6000' (no altimeter)
    Motor eject, 15s delay
    No drogue, 500' altitude on JLCR

    A couple of pictures here: http://www.rocketryforum.com/showthread.php?138918-L2!

    NAR L1 "Cheeto Dust", scratch 54mm, H54R (before it became a G54), Mansfield, WA
    L2 "Arc Light", Madcow 2.6" Arcas, J285CL, Mansfield, WA, recovery by snowshoe

  3. #63
    Join Date
    14th March 2009
    Location
    Ohio
    Posts
    3,147
    I know a guy who just certified NAR L1 using a JLCR. I'll see if I can get him to post here about it.
    Zeus-cat
    NAR# 92125 L1
    Total Impulse for 2017: 1,493.8 N/s Flights: 56
    2017: 1/2A:0, A:6, B:11, C:2, D:12, E:4, F:1, G: I have NEVER launched a G motor, H:1, I:1

  4. #64
    Join Date
    18th October 2016
    Posts
    418
    I did my TRA L2 cert today with a Jolly Logic Chute Release and an Altimeter Three along with my own DIY flight computer/telemetry/GPS tracker. I used my PML Quicksilver with an Aerotech J270W-14. The rocket weighs 43 oz without the motor and 65.5oz with it (4.1lbs). Over 7500 feet and about 0.97 Mach. It was a gorgeous flight!

    Here's the info from the Altimeter Three:
    Quicksilver (2.1" diameter)
    Max altitude 7533 ft
    Date 4/15/2017 9:57 AM
    Mode Rocket
    Duration 2 mins 26 secs
    Notes J270W-14
    Thrust time 2.05 secs
    Max speed 742 mph
    Peak accel 23.14 Gs
    Avg accel 16.49 Gs
    Ejection delay 14.35 secs
    Coast-Apogee 16.25 secs
    Apogee-Eject -1.90 secs
    Ejection altitude 7446 ft
    Initial descent 63 fps
    Landing speed 29 fps

    Click image for larger version. 

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    I attached the data file. Here are a few photos of the launch:

    Click image for larger version. 

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    Here's a video of the flight:
    Attached Files Attached Files

  5. #65
    Join Date
    5th June 2010
    Location
    Danville, CA
    Posts
    714
    Quote Originally Posted by GrouchoDuke View Post
    I did my TRA L2 cert today
    Awesome!! Congrats!

  6. #66
    Join Date
    18th October 2016
    Posts
    418
    Quote Originally Posted by John Beans View Post
    Awesome!! Congrats!
    Thanks!

    (Video added to my post above)

  7. #67
    Join Date
    11th October 2015
    Location
    West Linn, OR
    Posts
    79
    TRA L2 Cert 6/23/17
    4" Diameter 50" length Binder Design Excel.
    38 mm Aerotech J270 to just over 4600 ft. JL Chute release at 800ft.

    Thanks John!
    Craig
    L2
    TRA #16069

  8. #68
    Join Date
    19th June 2017
    Location
    Vacaville, CA
    Posts
    155
    I did my Level 1 cert on an Estes Argent. Stock build with 5 minute epoxy. Successful flight with H115DM-12. ~2200ft and my Jolly Logic Chute Release opened perfectly at 300 feet. Thanks John for the tech support.

    Click image for larger version. 

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    Last edited by Eric; 19th September 2017 at 03:49 PM. Reason: Photo
    Eric Hamilton, NAR, TRA
    SARG, LUNAR
    Level 1, April 2017, Estes Argent, H115DM
    Level 2, September 2017, Scratchbuilt 2.6", J270G

  9. #69
    Join Date
    5th June 2010
    Location
    Danville, CA
    Posts
    714
    Quote Originally Posted by Eric View Post
    I did my Level 1 cert on an Estes Argent. Stock build with 5 minute epoxy. Successful flight with H115DM-12. ~2200ft and my Jolly Logic Chute Release opened perfectly at 300 feet. Thanks John for the tech support. That's the picture next to my name. still learning how to upload an image.
    Nicely done. Congrats, Eric!

  10. #70
    Join Date
    30th January 2016
    Location
    US > OK > NE
    Posts
    3,222
    L1 built on the flight line at Airfest. mostly stock Mammoth, H97J-M(~10s), ~3k simmed alt, JLCR @300


  11. #71
    Join Date
    12th August 2013
    Posts
    64
    Used one on a 44k N flight and will be using one next week at ARLISS on an O motor going to about the same altitude. Neat little pieces of hardware.
    Scott
    TRA 8928 L3

    Current altitude PR: 45,709 feet

  12. #72
    Join Date
    22nd August 2015
    Location
    Rhode Island
    Posts
    1,059
    Quote Originally Posted by scatsob View Post
    Used one on a 44k N flight and will be using one next week at ARLISS on an O motor going to about the same altitude. Neat little pieces of hardware.
    Now that's inspirational! I'm hoping to use it for my 54 mm MD project, if I ever get around to building it.
    NAR #100940, RIMRA & CMASS
    L1 - 4/17/16, Tyrannosaur (by Binder Design), Loki H144
    L2 - 8/19/17, Terrordactyl (by Binder Design), CTI J250

  13. #73
    Join Date
    22nd August 2015
    Location
    Rhode Island
    Posts
    1,059
    I did my L2 last month using two Chute Releases. I linked them together to ensure redundancy. The battery on my Altimeter 3 died before the launch, so I don't have data, but it was a great flight to ~2500 ft. I set the Chute Releases to 300 ft. because I wanted to make sure it landed on the field, but in retrospect, I should have set it to 500 ft. I nearly had a heart attack before it opened.

    Click image for larger version. 

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    http://www.youtube.com/watch?v=vgXmhsdGRu8
    NAR #100940, RIMRA & CMASS
    L1 - 4/17/16, Tyrannosaur (by Binder Design), Loki H144
    L2 - 8/19/17, Terrordactyl (by Binder Design), CTI J250

  14. #74
    Join Date
    27th March 2013
    Location
    Has Changed
    Posts
    9,270
    Quote Originally Posted by BDB View Post
    I did my L2 last month using two Chute Releases. I linked them together to ensure redundancy. The battery on my Altimeter 3 died before the launch, so I don't have data, but it was a great flight to ~2500 ft. I set the Chute Releases to 300 ft. because I wanted to make sure it landed on the field, but in retrospect, I should have set it to 500 ft. I nearly had a heart attack before it opened.

    Click image for larger version. 

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    http://www.youtube.com/watch?v=vgXmhsdGRu8
    Next time split the difference and go for 400' and a mild heart murmur.
    Dreaming of making the rockets I dreamed of as a kid (and then some).


    NAR L1 Cert flight: Sheridan, Oregon, USA. Sept. 19, 2015. Flew Deep Space OFFl on an I357T-14A Blue Thunder

  15. #75
    Join Date
    26th November 2009
    Posts
    4,596
    Ummmm, Folks are really taking a chance with these really low level deployments. I've seen a few smack the ground and I've had a stiff chute protector hang the chute deployment twice. Once with a cardboard rocket (destroyed) and once with a glass rocket that survived. I've since arranged the chute protectors on the harness so they get pulled free once the CR releases the band. I fly at a large venue and won't go lower than 700'. With a GPS tracker I'll release higher so
    I can get a drift trend on a map. Like I said, I have a site with room to do that. There's no reason to do heart stopping low level releases at large launch sites if
    one wants to walk away with a reusable rocket! You lucked out on that cert and lesson learned I 'spose. Kurt

  16. #76
    Join Date
    18th January 2009
    Location
    Niagara Falls, NY
    Posts
    469
    Used on my L2 certification flight in July. Madcow Frenzy on an Aerotech DMS J270-10. Apogee at 3,012 ft, chute release at 400 ft. Perfect flight - just took a while to find in the corn.

    Chris
    http://chrisudy.blogspot.com
    Flying LPR since 1982
    NAR L1 - Aug 2015 - LOC Caliber ISP on H115DM-8
    NAR L2 - July 2017 - Madcow Frenzy (4") on J270-10

  17. #77
    Join Date
    26th November 2009
    Posts
    4,596
    Quote Originally Posted by chrisudy View Post
    Used on my L2 certification flight in July. Madcow Frenzy on an Aerotech DMS J270-10. Apogee at 3,012 ft, chute release at 400 ft. Perfect flight - just took a while to find in the corn.

    Chris
    Stick something like this on the harness if you got the room and I guarantee you'll hear the thing coming in! https://www.safetybasement.com/Perso...-p/sb-p140.htm
    There's several 140dB ones out there and easy enough to arrange it on the harness so the pull-pin is yanked out at apogee. Kurt

  18. #78
    Join Date
    18th January 2009
    Location
    Niagara Falls, NY
    Posts
    469
    I have one- just didn't use it that flight... 😬
    http://chrisudy.blogspot.com
    Flying LPR since 1982
    NAR L1 - Aug 2015 - LOC Caliber ISP on H115DM-8
    NAR L2 - July 2017 - Madcow Frenzy (4") on J270-10

  19. #79
    Join Date
    30th January 2016
    Location
    US > OK > NE
    Posts
    3,222
    Quote Originally Posted by ksaves2 View Post
    Ummmm, Folks are really taking a chance with these really low level deployments. I've seen a few smack the ground and I've had a stiff chute protector hang the chute deployment twice. Once with a cardboard rocket (destroyed) and once with a glass rocket that survived. I've since arranged the chute protectors on the harness so they get pulled free once the CR releases the band. I fly at a large venue and won't go lower than 700'. With a GPS tracker I'll release higher so
    I can get a drift trend on a map. Like I said, I have a site with room to do that. There's no reason to do heart stopping low level releases at large launch sites if
    one wants to walk away with a reusable rocket! You lucked out on that cert and lesson learned I 'spose. Kurt
    My rocket weighed a pound and change with over 400in^2 of surface area and I had sent it's twin brother up several times at 1-2k feet in a highly similar configuration. No nomex, only barf. That's not luck, it's practice :-)

    I agree you should rather think about how many -seconds- above ground you're popping the CR.

  20. #80
    Join Date
    9th December 2015
    Location
    Fullerton, CA
    Posts
    74
    Recently got my Tripoli L2 using a chute release.

    Flying a Wildman Punisher with an Aerotech J450DM. Flight simmed to 7,300' at approximately 750 MPH.



    TRA 16109
    L1 - 07/09/2016 - Wildman Demon Sport on an Aerotech H195
    L2 - 07/08/2017 - Wildman 3" Punisher on an Aerotech J450DM

    Personal records
    Altitude - 15,556' AGL
    Speed - 1,272 MPH

  21. #81
    Join Date
    14th March 2009
    Location
    Ohio
    Posts
    3,147
    If I go for L2 this year I will be using a Chute Release. The rocket I am currently building that can handle J motors, can't be set up for standard dual deploy without modifications, and I don't want to do that. Every L1 flight I have ever done has been dual deploy so I know how to do that. The question is do I want to shove a J motor in my newest rocket? Looking to join the mile high club... the rocket kind! Hmmm..........
    Zeus-cat
    NAR# 92125 L1
    Total Impulse for 2017: 1,493.8 N/s Flights: 56
    2017: 1/2A:0, A:6, B:11, C:2, D:12, E:4, F:1, G: I have NEVER launched a G motor, H:1, I:1

  22. #82
    Join Date
    25th April 2006
    Location
    Greater Kansas City Area
    Posts
    117
    Made a successful level 2 attempt on September 16, 2017 with an AMW Red FiberMAX using a CTI J335. The rocket weights every bit of five pounds dry. Recovery was with a 36-inch Sky-Angle and a 12-inch X-drogue (sorry I donít remember who made it) with the JLCR set to 400-feet. Weather was partly cloudy, 10-15MPH winds out of the South and about 90-degrees F. This was my second attempt. Text book flight. The JLA2 reports 2979 feet altitude.

    The first attempt was made last month with the same rocket and a CTI J185 with no drogue (the fatal error.) That long motor made the airframe stable and so it plummeted from apogee dragging the nose and recovery system behind it. Should have caught that when I getting it ready to launch; felt like a rooky. The release was set at 500-feet but by the time it cycled it had already taken a core sample. Damage to the rocket was light and limited to the coupler.

    And John, the HP-41 on your web site home page warms an old manís heart.
    Tim Burger
    NAR 78486 L2

  23. #83
    Join Date
    26th November 2009
    Posts
    4,596
    Quote Originally Posted by Zeus-cat View Post
    If I go for L2 this year I will be using a Chute Release. The rocket I am currently building that can handle J motors, can't be set up for standard dual deploy without modifications, and I don't want to do that. Every L1 flight I have ever done has been dual deploy so I know how to do that. The question is do I want to shove a J motor in my newest rocket? Looking to join the mile high club... the rocket kind! Hmmm..........
    Might need a tracker or wait for zero wind. Kurt

  24. #84
    Join Date
    21st January 2017
    Location
    Wichita KS
    Posts
    81
    I used a JL chute release on my PML Quicksilver with a J270 for my Level 2 cert. Went to 7100 ft, motor deploy at apogee, chute release at 600ft, and it landed about 200 yards from the pad. The harness got a little tangled on the way down but otherwise everything worked fine. I'm thinking I'll use a streamer or small drogue with the chute release from now on just to help keep the harness stretched out and avoid tangles.
    TRA #16895 L2

  25. #85
    Join Date
    14th April 2015
    Location
    Enumclaw, WA
    Posts
    1,569
    Quote Originally Posted by timb View Post
    Made a successful level 2 attempt on September 16, 2017 with an AMW Red FiberMAX using a CTI J335. The rocket weights every bit of five pounds dry. Recovery was with a 36-inch Sky-Angle and a 12-inch X-drogue (sorry I don’t remember who made it) with the JLCR set to 400-feet. Weather was partly cloudy, 10-15MPH winds out of the South and about 90-degrees F. This was my second attempt. Text book flight. The JLA2 reports 2979 feet altitude.

    The first attempt was made last month with the same rocket and a CTI J185 with no drogue (the fatal error.) That long motor made the airframe stable and so it plummeted from apogee dragging the nose and recovery system behind it. Should have caught that when I getting it ready to launch; felt like a rooky. The release was set at 500-feet but by the time it cycled it had already taken a core sample. Damage to the rocket was light and limited to the coupler.

    And John, the HP-41 on your web site home page warms an old man’s heart.
    I've taken to adding a drogue chute on my larger rockets that use a chute release. A little added insurance to keep the nose at or above the booster section.
    Ryan Winslow
    Level 1 5/28/16 3" kitbash Patriot H128W
    Level 2 5/13/17 Polecat 4" BBIII J270W

  26. #86
    Join Date
    25th April 2006
    Location
    Greater Kansas City Area
    Posts
    117
    Quote Originally Posted by Flyfalcons View Post
    I've taken to adding a drogue chute on my larger rockets that use a chute release. A little added insurance to keep the nose at or above the booster section.
    Yes, it's my opinion that I need at least a streamer for pretty much everything; a drogue is preferred, even if it's a small one.

    I spent most of the last launch flying the same unglamorous rocket over and over on G impulse motors until I had a technique that would reliably open a chute quickly after the release. My success rate with the release went from less than 50% to better than 90% with a drogue. One of the advantages of using a drogue is that the main opens rapidly rather than the hang-fire-flapping we so often see with a simple tumble, this means you can set the thing to release lower on windy days and use a bigger chute than you might otherwise. The other thing that had a big affect was to sandwich the shock cord between the chute and the release. Don't know why but that seemed to make a big difference.
    Tim Burger
    NAR 78486 L2

  27. #87
    Join Date
    28th November 2014
    Location
    Indiana
    Posts
    290
    JL recommends folding shroud lines inside the chute, are people doing this? I have and have a 100% success rate.
    TRA #16452
    L1 Wildman Drago

  28. #88
    Join Date
    14th April 2015
    Location
    Enumclaw, WA
    Posts
    1,569
    Yes I am.
    Ryan Winslow
    Level 1 5/28/16 3" kitbash Patriot H128W
    Level 2 5/13/17 Polecat 4" BBIII J270W

  29. #89
    Join Date
    22nd August 2015
    Location
    Rhode Island
    Posts
    1,059
    Quote Originally Posted by dhkaiser View Post
    JL recommends folding shroud lines inside the chute, are people doing this? I have and have a 100% success rate.
    That's how I do it. My only "failures" with the JLCR are when the bundle gets stuck in the tube. As long as the chute gets out, I too have a 100% success rate.
    NAR #100940, RIMRA & CMASS
    L1 - 4/17/16, Tyrannosaur (by Binder Design), Loki H144
    L2 - 8/19/17, Terrordactyl (by Binder Design), CTI J250

  30. #90
    Join Date
    21st September 2017
    Location
    NY/NJ
    Posts
    147
    Quote Originally Posted by John Beans View Post
    If you used Chute Release in your cert flight, could you please holler out your details?
    Rocket (with diameter and weight, if you know them)
    Motor
    Altitude (if you know it)
    PML Bumble Bee (3.9" diameter, 1,555g without motor)
    Flying on: AT H100W-10A 38mm DMS
    Flew to: 1447' on a windy day (~10mph steady, gusts to ~15mph), CR released successfully at 300'...

    L1

    Gory details - chute got tangled up upon CR release, and never fully inflated.
    Rocket came down on 48" chute acting as a streamer, landed ~20" feet from the launch pad. One slightly cracked fin fillet, otherwise, no damage, and good to fly again. Which counts as a successful L1 flight.

    CR did release and chute did successfully inflate at 300' during a preceding test flight on a G-motor.
    CR worked as advertised every time, flying this an other rockets. I chalk up L1 flight entanglement on chute packing user error.

    a

    Last edited by afadeev; 28th September 2017 at 03:10 AM.

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