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  1. #151
    Join Date
    15th March 2016
    Posts
    198
    Nice!

    Are you leaving the tailcone removable for easier motor retainer access?


  2. #152
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    12,279
    Yes, it's not glued in. It's held in by the aft rail button screw and the two brass flathead screws.

    NAR 91107, Level 2

    I really, really hate bugs.

  3. #153
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    12,279
    I'm cautiously optimistic that the rain will stay away, and we'll have a launch Saturday. So I got the Bullpup XL ready to fly. I'm a little concerned that I may have made the cable too long, and it might cause a zipper. But there's nothing I can do about it now, and I've had and repaired zippers before. I used a 12x12 blanket that I had to protect the laundry. That's a 36" nylon chute, and 15ft of nylon webbing. For a little extra insurance, and just for fun, I put an 18" chute on the nose cone.
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    NAR 91107, Level 2

    I really, really hate bugs.

  4. #154
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    12,279
    I didn't like the rail buttons with zinc round head screws, so I replaced them with chamfered buttons and brass flathead screws. Yes, I'm that anal.
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    NAR 91107, Level 2

    I really, really hate bugs.

  5. #155
    Join Date
    23rd January 2009
    Location
    New York
    Posts
    4,932
    Wrap the quick link with a bit of foam and duct tape.
    Dan Patell
    TRA 10904 L3

    Simplify your Raven's Wiring with Simple Circuit!!!

    Easy Research Rocketry
    29mm Research Hardware and 3d Printed Accessories

  6. #156
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    12,279
    Quote Originally Posted by patelldp View Post
    Wrap the quick link with a bit of foam and duct tape.
    That would work. A little foam rubber or some closed cell packing material.
    NAR 91107, Level 2

    I really, really hate bugs.

  7. #157
    Join Date
    23rd January 2009
    Location
    New York
    Posts
    4,932
    Quote Originally Posted by qquake2k View Post
    That would work. A little foam rubber or some closed cell packing material.
    My Dynacom Scorpion booster. Click image for larger version. 

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    Dan Patell
    TRA 10904 L3

    Simplify your Raven's Wiring with Simple Circuit!!!

    Easy Research Rocketry
    29mm Research Hardware and 3d Printed Accessories

  8. #158
    Join Date
    13th October 2014
    Location
    SouthEastern, WA
    Posts
    4,738
    Quote Originally Posted by qquake2k View Post
    I didn't like the rail buttons with zinc round head screws, so I replaced them with chamfered buttons and brass flathead screws. Yes, I'm that anal.
    A definite improvement, I do the same thing.
    Rich

    NAR# 99154

    L3-4x upscale Estes Cherokee-D- AT M1297W 5/28/2016 http://www.rocketryforum.com/showthr...r-rharshberger

    TriCities Rocketeers NAR section# 736 http://www.tricitiesrocketeers.org/

  9. #159
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    12,279
    Have you had a zipper in a fiberglass body tube? I didn't think that was a problem.
    NAR 91107, Level 2

    I really, really hate bugs.

  10. #160
    Join Date
    23rd January 2009
    Location
    New York
    Posts
    4,932
    Quote Originally Posted by qquake2k View Post
    Have you had a zipper in a fiberglass body tube? I didn't think that was a problem.
    No, but having a quick link bearing on the tube could definitely still cause issues.
    Dan Patell
    TRA 10904 L3

    Simplify your Raven's Wiring with Simple Circuit!!!

    Easy Research Rocketry
    29mm Research Hardware and 3d Printed Accessories

  11. #161
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    12,279
    Quote Originally Posted by rharshberger View Post
    A definite improvement, I do the same thing.
    Ha! I'm not the only one!
    NAR 91107, Level 2

    I really, really hate bugs.

  12. #162
    Join Date
    20th January 2011
    Location
    Redondo Beach, CA
    Posts
    4,768
    What a wonderful, classic, entertaining, and informative build thread!
    My launch this weekend got canceled. But I have had a good run so far this year..

    Reminds me of my late lamented PML Bullpuppy
    https://www.rocketreviews.com/2011-0...g250-9jpg.html

    So what is the motor of choice?

    Great thread Captain. Keep em coming!

    Very best of wishes. Stay dry! (Goodness, for how many years have we wished for wet?)

    Jeff Gortatowsky
    Redondo Beach, CA. NAR 70988 Level 2
    2017 Stats: Flights: 16
    Approximate Total Impulse: 2,354.23 Ns (Equivalent to about 84% of a full K motor.)
    Approx. Average Cost per flight: $$15.17 USD
    Approx. Total RETAIL Cost: $242.75 USD (Not what I paid)

    Link will take you to: About me, Flights, and Fleet

    --------------------
    "One does not believe in science. Science is a set of methods for inquiry of that which is real, not a belief system. -- Doctor Steven Novella

  13. #163
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    12,279
    That's a good looking Pup, Jeff! I have a G75 SU Metalstorm for its first flight. It sims to about 900ft on it, which is perfect for the smaller SARG field. My only concern is the delay. It's non-adjustable, and Open Rocket says that at 7 seconds it'll be travelling at 27fps at deployment. I like to keep them under 10fps, but that's not possible with the SU motor. So I'll say a little prayer to the rocket gods, and hope for the best. I have been accused in the past of building rockets like tanks, so hopefully that will see the Pup through. If not, well, the up part will look good! When I launch it at Snow Ranch, I'll use an H128W or H165R.

    I'm actually back in the swing of things, and have three more builds in the works. 5 Times A Fool, Pink Hornet, and Meaner Machine (a 9ft tall 2.6" Mean Machine upscale).
    NAR 91107, Level 2

    I really, really hate bugs.

  14. #164
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    12,279
    I took Dan's advice and wrapped the quick link in some closed cell foam. It's not pretty, but it should help prevent a zipper.
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    NAR 91107, Level 2

    I really, really hate bugs.

  15. #165
    Join Date
    20th January 2011
    Location
    Redondo Beach, CA
    Posts
    4,768
    As you know, like you, after my heart valve replace 3 years ago, AND a new job almost at the same time, I was away for 3 years... so I can be excused if 'life got in the way and I forgot a thing or two'!

    I wish I could depend on simulations to be that specific. I too try to accept their advice. Goodness I am sure MANY of my rockets have taken a bigger FPS beating!
    Were you not an advocate of zipperless designs back in the day? Those take high FPS deployments with a bit more grace.

    But like you... sometimes I just use the 'thats too short... thats too long... I will try the long rather than rip it apart just after burnout!'

    I'll be fine. Especially with the foam.
    Jeff Gortatowsky
    Redondo Beach, CA. NAR 70988 Level 2
    2017 Stats: Flights: 16
    Approximate Total Impulse: 2,354.23 Ns (Equivalent to about 84% of a full K motor.)
    Approx. Average Cost per flight: $$15.17 USD
    Approx. Total RETAIL Cost: $242.75 USD (Not what I paid)

    Link will take you to: About me, Flights, and Fleet

    --------------------
    "One does not believe in science. Science is a set of methods for inquiry of that which is real, not a belief system. -- Doctor Steven Novella

  16. #166
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    12,279
    Yes, I used to be quite enamored of the zipperless design. Most of my HPR scratchers are zipperless. But of the four current builds in the pipeline, only one will be zipperless (Meaner Machine). The reason? Most of it has to do with paint schemes, believe it or not. That and laziness. Hey, at least I'm honest!

    And I wasn't aware of your heart valve replacement, or I don't remember it. Either way, I'm very happy you're still alive and kicking!
    NAR 91107, Level 2

    I really, really hate bugs.

  17. #167
    Join Date
    18th January 2009
    Location
    Urff
    Posts
    6,615
    Quote Originally Posted by qquake2k View Post
    I took Dan's advice and wrapped the quick link in some closed cell foam. It's not pretty, but it should help prevent a zipper.
    Do you think the padding around the quick link prevented the chute bundle from being pulled/blown out of the body tube this past Saturday?

    Given the relatively small diameter of the 3" tube, I'd be inclined to just wrap a bit of masking tape around the quick link and/or shock cord.

    I've been using flat kevlar tubing for the fin can cord at a length that reaches a few inches past the end of the fin can body. Attach a quick link or heavy duty swivel to it and you're good to go.
    Cranky Kong, Certified Rocket Monkey
    "We were promised jet packs!"

    Total Impulse in 2016: 1,318.99 Ns (Equivalent to a 3% K motor)
    Total Impulse since 2010: 12,338.57 Ns (Equivalent to a 20% N motor)

  18. #168
    Join Date
    26th January 2010
    Location
    Northern California
    Posts
    12,279
    Quote Originally Posted by o1d_dude View Post
    Do you think the padding around the quick link prevented the chute bundle from being pulled/blown out of the body tube this past Saturday?

    Given the relatively small diameter of the 3" tube, I'd be inclined to just wrap a bit of masking tape around the quick link and/or shock cord.

    I've been using flat kevlar tubing for the fin can cord at a length that reaches a few inches past the end of the fin can body. Attach a quick link or heavy duty swivel to it and you're good to go.
    That's the way I've done it in the past. With this one, I used a short steel cable. I'm not sure what tangled the big chute, but I have a feeling it had something to do with how I wrapped the blanket.

    And where were you Saturday? We had a great launch! David R. was hitting the Dark Matters hard!

    NAR 91107, Level 2

    I really, really hate bugs.

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