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  1. #31
    Join Date
    26th January 2010
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    Northern California
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    It's perfect! Thanks Gary!

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    NAR 91107, Level 2

    I really, really hate bugs.

  2. #32
    Join Date
    26th January 2010
    Location
    Northern California
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    Got the half moon baffles done.

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    NAR 91107, Level 2

    I really, really hate bugs.

  3. #33
    Join Date
    26th January 2010
    Location
    Northern California
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    Got the coupler and baffle plate epoxied in.
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    NAR 91107, Level 2

    I really, really hate bugs.

  4. #34
    Join Date
    26th January 2010
    Location
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    I forgot to mark the position of the forward rail button before I epoxied the baffle plate in place. So I guessed, and lucked out.
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    NAR 91107, Level 2

    I really, really hate bugs.

  5. #35
    Join Date
    26th January 2010
    Location
    Northern California
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    13,158
    The fin tabs ended up a little too long. So I pinned them back together, and sanded off about 1/16". That's all it took.
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    NAR 91107, Level 2

    I really, really hate bugs.

  6. #36
    Join Date
    26th January 2010
    Location
    Northern California
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    13,158
    Using my handy fin guide, I got all 6 fins epoxied on. This is actually my third rocket with 6 fins, but the first with all 6 fins the same size, shape, and orientation.
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    NAR 91107, Level 2

    I really, really hate bugs.

  7. #37
    Join Date
    26th January 2010
    Location
    Northern California
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    13,158
    I'm liking it! The nose cone is repurposed from a broken rocket.
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    NAR 91107, Level 2

    I really, really hate bugs.

  8. #38
    Join Date
    26th January 2010
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    Northern California
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    Good to the last drop!
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    NAR 91107, Level 2

    I really, really hate bugs.

  9. #39
    Join Date
    26th January 2010
    Location
    Northern California
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    13,158
    Got the aft rail button installed, and the external fillets applied.
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    NAR 91107, Level 2

    I really, really hate bugs.

  10. #40
    Join Date
    26th January 2010
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    Northern California
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    I've done this before to flat bottomed rockets. I added a slice of body tube to double up the aft end. Hopefully, this will limit landing damage.
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    NAR 91107, Level 2

    I really, really hate bugs.

  11. #41
    Join Date
    22nd July 2011
    Location
    Where ever the the boss sends me...
    Posts
    2,700
    Coming along nicely... Pretty soon you're going to have to get an out building of some sort (or rent a storage unit) for all your rockets!
    Terry

    NAR L1
    L2 is on hold, maybe never

  12. #42
    Join Date
    3rd August 2011
    Location
    Reed City, Michigan
    Posts
    3,485
    That's a neat way of beefing up the butt end of things Jim.
    I've been filling area between the engine tube and body tube with glue.
    But I don't deal with engine retainers....yet.
    This would save a heck of a lot of glue!
    Thanks for sharing this!
    Love your build threads.

  13. #43
    Join Date
    26th June 2016
    Location
    Mobile, AL, USA
    Posts
    1,236
    I like the look of this one too!

    I also like your Fin Jig. Are there plans available for making one in a smaller scale for LPR/MPR rockets?
    NAR # 37682

    All the weird kids are doing it!

    If at first you don't succeed... You're about average.

  14. #44
    Join Date
    26th January 2010
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    Northern California
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    13,158
    Quote Originally Posted by TangoJuliet View Post
    I like the look of this one too!

    I also like your Fin Jig. Are there plans available for making one in a smaller scale for LPR/MPR rockets?
    I built a smaller version before I built the bigger one:

    http://www.rocketryforum.com/showthr...lignment-Guide

    And the bigger one:

    http://www.rocketryforum.com/showthr...uide-Version-2
    Last edited by qquake2k; 28th April 2017 at 02:52 PM.
    NAR 91107, Level 2

    I really, really hate bugs.

  15. #45
    Join Date
    26th June 2016
    Location
    Mobile, AL, USA
    Posts
    1,236
    Excellent! Thank you. Now I just need to locate a friend with a table saw who can cut the 45* edge for me on a couple of 1x4's.
    NAR # 37682

    All the weird kids are doing it!

    If at first you don't succeed... You're about average.

  16. #46
    Join Date
    26th January 2010
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    Northern California
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    Quote Originally Posted by TangoJuliet View Post
    Excellent! Thank you. Now I just need to locate a friend with a table saw who can cut the 45* edge for me on a couple of 1x4's.
    If you have a router table, you could use a 45 degree chamfer bit.
    NAR 91107, Level 2

    I really, really hate bugs.

  17. #47
    Join Date
    8th May 2012
    Location
    Southern, CA
    Posts
    6,191
    Quote Originally Posted by qquake2k View Post
    Got the aft rail button installed, and the external fillets applied.
    I have a question? How come when you mount your rail buttons they aren't centered on the line you drawn? I'm just curious and figured there's a reason behind it and probably a good one. Is it easier to get them lined up? They look really nice.
    NAR # 89516
    HPR Cert Level 1

  18. #48
    Join Date
    8th May 2012
    Location
    Southern, CA
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    6,191
    Quote Originally Posted by qquake2k View Post
    I've done this before to flat bottomed rockets. I added a slice of body tube to double up the aft end. Hopefully, this will limit landing damage.
    I do the same thing, but on all my builds if possible.
    NAR # 89516
    HPR Cert Level 1

  19. #49
    Join Date
    26th January 2010
    Location
    Northern California
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    Quote Originally Posted by AfterBurners View Post
    I have a question? How come when you mount your rail buttons they aren't centered on the line you drawn? I'm just curious and figured there's a reason behind it and probably a good one. Is it easier to get them lined up? They look really nice.
    It's because the fins are mounted to the right of the lines, instead of centered on the lines. The fins are 1/4" thick, so to keep the rail buttons centered, they need to be placed 1/8" to the right.
    NAR 91107, Level 2

    I really, really hate bugs.

  20. #50
    Join Date
    8th May 2012
    Location
    Southern, CA
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    Quote Originally Posted by qquake2k View Post
    There is a backstory to the name. When I was a kid, my mom used to tell me a story about when she and my uncle were kids. My grandmother accused Uncle Raymond of farting. He said to her, "I didn't feel a thump in my down, mama!" Well, it sounds like a good name for a rocket to me!
    Thump will be 4" diameter, 64" long, have 6 fins, a 38mm motor mount, and be a zipperless design.
    Never trust a fart!
    NAR # 89516
    HPR Cert Level 1

  21. #51
    Join Date
    26th January 2010
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    Northern California
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    Not all farts are bad...
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    NAR 91107, Level 2

    I really, really hate bugs.

  22. #52
    Join Date
    18th January 2009
    Location
    Urff
    Posts
    6,811
    Quote Originally Posted by qquake2k View Post
    Not all farts are bad...
    The Plasma Fart! I remember that one.
    Cranky Kong, Certified Rocket Monkey
    "But we were promised jet packs!"

    Total Impulse in 2017: 605.77 Ns (Equivalent to an 89% I motor)
    Total Impulse since 2010: 13,872.11 Ns (Equivalent to a 35% N motor)

  23. #53
    Join Date
    3rd August 2011
    Location
    Reed City, Michigan
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    3,485
    Plasma...another word for blood if I'm not mistaken.
    Bloody Fart...Might not be so good...
    Of course...Vulcan blood is green...

  24. #54
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    26th January 2010
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    Quote Originally Posted by o1d_dude View Post
    The Plasma Fart! I remember that one.
    Tony Cooper suggested the name.
    NAR 91107, Level 2

    I really, really hate bugs.

  25. #55
    Join Date
    26th January 2010
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    Quote Originally Posted by Woody's Workshop View Post
    Plasma...another word for blood if I'm not mistaken.
    Bloody Fart...Might not be so good...
    Of course...Vulcan blood is green...
    Bloody Fart? Not so much. LOL

    Vulcan Fart? Not bad. In fact, you could do a whole series of "fart" rockets. Plasma Fart, Vulcan Fart, Ion Fart, Laser Fart, etc.
    Last edited by qquake2k; 29th April 2017 at 09:51 AM.
    NAR 91107, Level 2

    I really, really hate bugs.

  26. #56
    Join Date
    3rd August 2011
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    Reed City, Michigan
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    You for SBD and Room Clearing...

  27. #57
    Join Date
    26th January 2010
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    Northern California
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    Got the retention clips done. I used 1/8" x 1/2" aluminum bar.
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    NAR 91107, Level 2

    I really, really hate bugs.

  28. #58
    Join Date
    26th January 2010
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    Northern California
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    Perfect!
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    NAR 91107, Level 2

    I really, really hate bugs.

  29. #59
    Join Date
    26th June 2016
    Location
    Mobile, AL, USA
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    1,236
    Nice, but that lower bend looks like a weak point and susceptible to breakage.
    NAR # 37682

    All the weird kids are doing it!

    If at first you don't succeed... You're about average.

  30. #60
    Join Date
    26th January 2010
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    Quote Originally Posted by TangoJuliet View Post
    Nice, but that lower bend looks like a weak point and susceptible to breakage.
    I have been making them the same way and from the same material for years. I haven't had one fail yet.

    NAR 91107, Level 2

    I really, really hate bugs.

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