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  1. #61
    Join Date
    6th June 2011
    Location
    San Diego. CA.
    Posts
    6,387
    Grain is highly over-rated, except in beer....

    TRA 2383
    Somebody told me I was on the watch list-I hope I get a Rolex.....
    The road to Hell is paved....you're welcome.
    I can't remember the last rocket I built, because I haven't built it yet.....

  2. #62
    Join Date
    18th January 2009
    Location
    Maryland
    Posts
    11,403
    And whisky.

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

  3. #63
    Join Date
    14th July 2015
    Location
    Randolph, NJ
    Posts
    2,883
    Quote Originally Posted by rstaff3 View Post
    Measure once, cut twice.
    Measure it with a micrometer.

    Mark it with chalk.

    Cut it with an axe.

  4. #64
    Join Date
    25th October 2016
    Location
    Texas, United States
    Posts
    1,635
    Quote Originally Posted by neil_w View Post
    Measure it with a micrometer.

    Mark it with chalk.

    Cut it with an axe.
    If you don't have chalk, magic marker, whiteboard marker, powdered burnt propellant, or spray paint work just as well.

    If you don't have an axe, try using a chainsaw, flamethrower, belt sander, brick, or running it over with your car.
    ​Tony

    It's so nice to have integrity, I'll tell you why:
    If you really integrity, it means your price is very high!

    ~ Tom Lehrer

  5. #65
    Join Date
    27th March 2013
    Location
    Has Changed
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    9,163
    Quote Originally Posted by Incongruent View Post
    If you don't have chalk, magic marker, whiteboard marker, powdered burnt propellant, or spray paint work just as well.
    Dang, I was thinking a paint roller would work.

    Last edited by K'Tesh; 1st November 2016 at 02:43 AM.
    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

  6. #66
    Join Date
    27th August 2011
    Location
    West Tennessee
    Posts
    2,634
    D12-0s and D12-3s are interchangeable.
    It is amazing what you can do when you don't have a choice.

    Smart people learn from their mistakes.
    REALLY SMART PEOPLE learn from OTHERS' mistakes.

  7. #67
    Join Date
    29th July 2012
    Location
    Belleville, IL
    Posts
    593
    Cutting fins with a scissors leaves a splintery edge that's excellent for gluing.
    Clear skies and fair winds,
    Mike
    NAR 31689 L1

  8. #68
    Join Date
    25th October 2016
    Location
    Texas, United States
    Posts
    1,635
    Quote Originally Posted by K'Tesh View Post
    Dang, I was thinking a paint roller would work.

    Only with white (or brown, depends on the tube) paint. Or plain ol' water.
    A crop duster filled paint works even better though.
    ​Tony

    It's so nice to have integrity, I'll tell you why:
    If you really integrity, it means your price is very high!

    ~ Tom Lehrer

  9. #69
    Join Date
    18th January 2009
    Location
    Maryland
    Posts
    11,403
    Quote Originally Posted by neil_w View Post
    Measure it with a micrometer.

    Mark it with chalk.

    Cut it with an axe.
    LOL, good one!
    Dick Stafford
    The member formerly known as the Pointy-Haired Moderator.
    The Original Rocket Dungeon
    Volunteer compiler of product news for ROCKETS Magazine

  10. #70
    Join Date
    19th January 2009
    Posts
    2,324
    The CG should be well back. That way, when you balance the rocket midway along the body, the tail will point down, which is where you want it pointing during flight.

    Fins - who needs them? The Trident missile flies perfectly well without them, and if that's good enough for a rocket on which the nation's security depends then it's good enough for yours as well.

    There's no need for a full countdown. "Ready, steady, go" is perfectly acceptable. So is "Hey y'all, watch this". But "Hold my beer" is not - you should have handed the beer to someone before you took the launch controller, which is why there's now beer all over the launch controller.

    Or, for preference, drink the lot before going near the launch controller. If the rocket is more stable and more vertically upright than you, then it will be fine, which means you need to have plenty of beer inside you so that you are less stable than the rocket.

    LCO's checklist:
    1. Has the rocket been verified stable in a simulator?
    2. Has it been swing-tested?
    3. Does it look interesting?
    4. Did the owner give you one of his beers?
    If the answer to any of these is "yes", let it fly.
    Don't just stand there, get one up!

  11. #71
    Join Date
    5th August 2014
    Location
    Boston, MA
    Posts
    886
    Static test each motor before use.
    Daniel J. Petrie - The Rocket N00b - NAR # 100015
    rocketn00b.blogspot.com
    facebook.com/rocketn00b
    YouTube: youtube.com/TheRocketN00b Twitter: @rocketn00b
    The Rocketry Show Podcast

  12. #72
    Join Date
    25th October 2016
    Location
    Texas, United States
    Posts
    1,635
    Quote Originally Posted by lcorinth View Post
    Static test each motor before use.
    Test each igniter for firing current before use.

    Test each BP ejection charge for compatibility before use.

    Test all electronics for maximum current before use.

    Test all fins for shear strength before use.

    Test the airframe for crush strength before use.

    Test all wadding, parachute protectors, reusable wadding and baffles for flame resistance before use.

    Test all reloadable casings for puncture strength before use.

    Test all nose cones for crush strength before use.

    Test all paper parts for flame resistance before use.

    Test all plastic parts for melting point before use.

    Test all cables for tensile strength before use.

    Test fiberglass parts for compressive strength before use.

    Test motor hooks and motor retainers for malleability before use.

    Test all glues for drying or curing time before use.

    Test all cutting tools for dulling time before use.

    Test all shear pins for shear strength before use.

    Test all blast deflectors for burn through time before use.

    Test all launch sites for flammability before use.

    Test all launch rods and rails for malleability before use.

    Test launch lugs for screwdriver compatibility before use.

    Test rail guides for attachment strength before use.

    Test all extinguishers for duration and capability on a testing fore before use.

    Test all shock cords and shroud lines for tensile strength before use.

    Test all parachutes for flame resistance before use.

    Test barrel swivels for hammer resistance before use.

    Test eyelets for tensile strength before use.

    Test all paper towels for grime cleaning ability before use.

    Test all balsa for crush strength before use.

    Test all centering rings and engine blocks for plasma torch cut resistance before use.

    Test all fillets for maximum hold strength before use.

    Test all launch pads for maximum rocket weight before use.

    Test all trees for rocket grabbing ability before use.

    Test all spray paints for paint volume before use.

    Test all fillers for drying time before use.

    Test all clear parts for permanent clouding before use.

    Test finished rockets for ballistic re-entry before use.



    Test all the above tips for validity... after use.
    ​Tony

    It's so nice to have integrity, I'll tell you why:
    If you really integrity, it means your price is very high!

    ~ Tom Lehrer

  13. #73
    Join Date
    25th October 2016
    Location
    Texas, United States
    Posts
    1,635
    Quote Originally Posted by adrian View Post
    LCO's checklist:
    1. Has the rocket been verified stable in a simulator?
    2. Has it been swing-tested?
    3. Does it look interesting?
    4. Did the owner give you one of his beers?
    If the answer to any of these is "yes", let it fly.
    5. Will it be a heads up launch?
    6. Does it follow at least 1 of the NAR safety code rules?
    7. Is the motor big enough for the field?
    8. Do you like the rocket's owner?
    9. Are you being bribed?
    10. Are you in a bomb suit?
    ​Tony

    It's so nice to have integrity, I'll tell you why:
    If you really integrity, it means your price is very high!

    ~ Tom Lehrer

  14. #74
    Join Date
    5th February 2009
    Location
    Montreal, Qweebec
    Posts
    3,117
    Destructive testing can lead to many more hours of enjoyable building

    Hotels / Motels at major launches always have extra rooms..
    -paul

    NAR# 101258 - L1
    www.CRMRC.org
    I don't know the same things you don't know..

  15. #75
    Join Date
    14th July 2015
    Location
    Randolph, NJ
    Posts
    2,883
    Always keep your fingernails nice and long while working with balsa parts.


  16. #76
    Join Date
    31st January 2009
    Posts
    4,212
    Quote Originally Posted by cerving View Post
    To quickly build your rocket, hot melt glue works great.
    We once had an entire Civil Air Patrol group show up at a launch and every one of them had used hot glue to attach the fins. What a mess.
    "I don't make jokes. I just watch the government and report the facts." - Will Rogers

    "If you don't read the newspaper, you're uninformed. If you read the newspaper, you're misinformed." - Mark Twain

  17. #77
    Join Date
    25th October 2016
    Location
    Texas, United States
    Posts
    1,635
    Quote Originally Posted by neil_w View Post
    Always keep your fingernails nice and long while working with balsa parts.

    Especially the lightweight "competition" balsa!


    X-Acto knives are great for flush trimming paint and excess decal off of fins! The blade never strays from the intended path!

  18. #78
    Join Date
    14th July 2015
    Location
    Randolph, NJ
    Posts
    2,883
    Quote Originally Posted by Incongruent View Post
    Especially the lightweight "competition" balsa!
    Always use competition balsa for all structural components. It's for "competition", therefore it's better!

  19. #79
    Join Date
    25th October 2016
    Location
    Texas, United States
    Posts
    1,635
    Quote Originally Posted by neil_w View Post
    Always use competition balsa for all structural components. It's for "competition", therefore it's better!
    Except the nose cone, body, and fins. Those should be cast lead.
    ​Tony

    It's so nice to have integrity, I'll tell you why:
    If you really integrity, it means your price is very high!

    ~ Tom Lehrer

  20. #80
    Join Date
    25th February 2014
    Posts
    542
    don't worry about a loose nose cone. the force during flight will keep it in place.

  21. #81
    Join Date
    27th March 2013
    Location
    Has Changed
    Posts
    9,163
    Don't bother to scan (with a ruler) the fins (in the matrix, or out of it) and decals of your old eBay scores or bother to document the thickness. Everything you could possibly want has already been archived.

    Forget about your rocket's hang tags and face cards, they don't have any valuable information on them, and can't possibly ever be useful.

    And instructions? Go ahead and cut them up for the fin alignment guides, and tri-fold mounts without scanning them first. Who would possibly ever want to see instructions after you build your rocket?
    Last edited by K'Tesh; 8th November 2016 at 06:23 AM.
    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

  22. #82
    Join Date
    15th October 2016
    Location
    Huntsville AL
    Posts
    1,350
    To prevent loose wires near your recovery harness and ejection charge holders, just run a slow-burning fuse to them out a vent hole and light it before they close the range.
    "I'm at least 70% confident about whatever I say (90% of the time)"- college me

    NAR 101195
    Level 1: Big SAM, 9/10/16

  23. #83
    Join Date
    27th March 2013
    Location
    Has Changed
    Posts
    9,163
    A Metalstorm motor is a really good choice on a windy day, in tall dry grass, while temperatures are above 90 degrees F (and humidity is low).
    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

  24. #84
    Join Date
    25th October 2016
    Location
    Texas, United States
    Posts
    1,635
    Scared your ejection charge is too wimpy? Stuff the tube with flash powder!

  25. #85
    Join Date
    27th March 2013
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    Has Changed
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    9,163
    Quote Originally Posted by Incongruent View Post
    Scared your ejection charge is too wimpy? Stuff the tube with flash powder!
    Uhmmm.... It's been done before, but not as an ejection charge. More like uhmmm.... ah... a payload... Yeah! That's it... A Payload.
    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

  26. #86
    Join Date
    25th October 2016
    Location
    Texas, United States
    Posts
    1,635
    Just clone this and you're set!
    Quote Originally Posted by Lonestar View Post


    http://imgur.com/duG8PUN Stamped out serial number?
    http://i.imgur.com/Pe4qft2.jpg
    http://i.imgur.com/6mJDWiG.jpg


    http://imgur.com/nvyfhyJ Bottom


    middle to bottom


    http://i.imgur.com/mDYuQxt.jpg middle to top.

    Im leaning away from the APFSDS (armor piercing fin stabilizing discarding sabot) round. I just looks too old to be one and the weight and shape aren't right.
    Im leaning away from the APFSDS (armor piercing fin stabilizing discarding sabot) round. I just looks too old to be one and the weight and shape aren't right.

    Pre 1960 were people making their own hobby rockets out of steel?
    Possibly this piece would have came down on a parachute and the back half would have been separated at the apex of the flight. It would have been at least twice as long and considering the material, it would have stood at least 3 foot tall in order to have enough propellant to lift it up. Thoughts on that?


    Pre 1960 were people making their own hobby rockets out of steel?
    Possibly this piece would have came down on a parachute and the back half would have been separated at the apex of the flight. It would have been at least twice as long and considering the material, it would have stood at least 3 foot tall in order to have enough propellant to lift it up. Thoughts on that?
    ​Tony

    It's so nice to have integrity, I'll tell you why:
    If you really integrity, it means your price is very high!

    ~ Tom Lehrer

  27. #87
    Join Date
    26th June 2016
    Location
    Mobile, AL, USA
    Posts
    1,236
    Start a thread about bogus tips and put it in the "Beginners & Educational Programs" forum where a newbie would never confuse it for actual good advice, instead of the "Watering Hole" where it should probably be.
    NAR # 37682

    All the weird kids are doing it!

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

  28. #88
    Join Date
    20th April 2012
    Location
    Fredericksburg VA
    Posts
    1,455
    To get a flame effect in your paint job, hold a lit match in front of your paint gun while spraying lacquer.
    NAR Level 2 #96210

  29. #89
    Join Date
    25th October 2016
    Location
    Texas, United States
    Posts
    1,635
    Quote Originally Posted by TangoJuliet View Post
    Start a thread about bogus tips and put it in the "Beginners & Educational Programs" forum where a newbie would never confuse it for actual good advice, instead of the "Watering Hole" where it should probably be.
    Well, you can see what not to do...
    I mean, without this thread, would you have known not to cram your body tubes with dog barf?

    Very common beginner mistake. Obviously.

  30. #90
    Join Date
    20th January 2009
    Location
    Johnson City, NY
    Posts
    1,920
    Seasonal Tip

    Ignore all of the Black Friday / Black Saturday sales....

    Rocket Addict
    More...more...I'm still not satisfied (T. Lehrer)

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