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  1. #1
    Join Date
    8th October 2017
    Posts
    6

    Tango Charlie Foxtrot

    New to the posts, but I thought I'd show off the upscale version of a parallel staging booster rocket, the Tango Charlie Foxtrot (stands for Two Clusters of Four, and nothing else). The original model flew successfully on three E-9's in the main, and the boosters just had B6-0's and ejected from the body after burn. The upscale is set to launch with four F15-6 Estes motors in the main, and each booster gets an E16-0 (all together putting it in a low I category, I believe). The boosters each connect to the body at four solid hardwood dowels. You can see some detail on the 90 degree connection on the boosters that mate with the hardpoints. The boosters come down on externally wrapped streamers. That worked fine on the smaller version, but I'm open to suggestions on a better recovery scheme on the boosters. I can't use an ejection charge on the motors to eject a chute, as I'm using the -0's to eject the booster from the body.

    The challenge now is lighting off 8 motors. What could possibly go wrong?

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  2. #2
    Join Date
    18th January 2009
    Location
    Maryland
    Posts
    11,705
    Very nice...that will scoot.

    Sent from my SAMSUNG-SGH-I337 using Rocketry Forum mobile app

    Dick Stafford
    The member formerly known as the Pointy-Haired Moderator.
    The Original Rocket Dungeon
    Volunteer compiler of product news for ROCKETS Magazine

  3. #3
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    13,459
    Incredible!
    NAR 91107, Level 2

    I really, really hate bugs.

  4. #4
    Join Date
    14th July 2015
    Location
    Randolph, NJ
    Posts
    3,546
    Beautiful work, really impressive. Flight pics and/or video please!

  5. #5
    Join Date
    16th January 2017
    Location
    UK
    Posts
    56
    Fantastic work, love the style of the rocket. Can we see some close-ups of how the staging works?
    Soyuz 1/50 scratch build - http://www.rocketryforum.com/showthr...yuz-1-50-build
    Skylark - http://www.rocketryforum.com/showthr...ounding-rocket

    Level 1, 09/07/2017 PML IO, H152

  6. #6
    Join Date
    22nd August 2015
    Location
    Rhode Island
    Posts
    1,282
    This is excellent. I agree with the previous postócan you show how the booster staging works?


    Sent from my iPhone using Rocketry Forum
    NAR #100940, RIMRA & CMASS
    L1 - 4/17/16, Tyrannosaur (by Binder Design), Loki H144
    L2 - 8/19/17, Terrordactyl (by Binder Design), CTI J250

  7. #7
    Join Date
    4th October 2014
    Posts
    897
    Take a look at the Apogee strap on booster kits for an alternative, they use an ejection charge to pop the nose cone which is also a retainer, when the nose pulls out the streamers the boosters peel off.
    https://www.apogeerockets.com/Rocket...n-Booster-Pods

    Also, checkout this Soyuz thread for a staged core which allows the use of ejection on the strap on boosters, more realistic. Just have to plan the time of the impulse and delay right.
    http://www.rocketryforum.com/showthr...yuz-1-50-build

  8. #8
    Join Date
    8th October 2017
    Posts
    6

    Booster detail

    Close up of hard point on body and 90 degree side port on booster. The hard point is a short piece of hardwood dowel screwed into a piece of basswood. Turns out, four 29 mm tubes fit snuggly inside a 3" Blue Tube coupler. The basswood piece is cut and the edges chamfered to fit between the outside of the 29 mm tubes and the inside of the coupler.Click image for larger version. 

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    It's strong enough that I could pick up the entire 112 oz. rocket by a single booster, which was really a design requirement. My RSO would prefer I avoid a stray booster.

  9. #9
    Join Date
    8th October 2017
    Posts
    6

    Liftoff

    Click image for larger version. 

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    All four E-16 boosters lit, but we only got 3 out of the 4 F-15 mains. All ignitors fired, so I'm suspicious that the bad one may have gotten blown out by a nearby motor. It did fine, however. All boosters detached and we got 'chute just after apogee. It was a slow, majestic liftoff, and the sound of 7 BP motors is really cool. We'll reset for a December launch and be a bit more careful on the ignitor placement.

  10. #10
    Join Date
    31st May 2017
    Location
    Houston, TX
    Posts
    209
    Looks awesome! Love BP (well and APCP) clusters!
    TRA #17256
    Tripoli Houston
    L1 - 7/8/17

  11. #11
    Join Date
    5th December 2013
    Location
    MD
    Posts
    7,375
    Nice. Hope you post more!

    John S. ---- NAR #96911 ---- TRA #15253 ---- MDRA #067 ---- BARC #028
    L1, 3/15/14: Aerotech Sumo, CTI H133BS
    L2, 6/21/14: Giant Leap Vertical Assault, CTI J240RL
    L3, 3/12/16: MAC Performance Radial Flyer, CTI M1101WH
    Altitude: 13,028', L3 flight; Speed: Mach ???, L3 flight

  12. #12
    Join Date
    22nd August 2015
    Location
    Rhode Island
    Posts
    1,282
    Great flight!

    I've not clustered 29 mm BP motors, but I've definitely experienced issues getting them to light. I have been using e-matches lately instead of traditional Estes igniters with 100% success.
    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. #13
    Join Date
    4th October 2014
    Posts
    897
    Whisky Tango Foxtrot!?! That is one Total Cluster Fenomenon! Nice launch.

    So the strap on boosters have enough friction in the piston joint to keep them wedged in between the fins, and the zero-delay engines produce enough force to pop them off, then the external wrap around streamers just unravel, clever technique.

  14. #14
    Join Date
    8th October 2017
    Posts
    6
    https://youtu.be/20yT0BpZywg

    On-board video.


    https://youtu.be/ROF5blYDaVM

    Slow motion video with audio from on-board camera for effect.

  15. #15
    Join Date
    8th October 2017
    Posts
    6
    Good to hear about the e-matches. I did use standard Estes ignitors with some extensions soldered on for this launch, along with some shrink tubing to ensure no shorting. We did a ground test on a full set of 8 on our launch system, and they all went of simultaneously. Will be trying for the full 8 next month (after a bit of cosmetic repair - we blistered the paint near the aft end).

  16. #16
    Join Date
    8th October 2017
    Posts
    6
    Yep, that's pretty much it!


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