Help Support RocketryForum by donating using the link above or becoming a Supporting Member.


Results 1 to 20 of 20
  1. #1
    Join Date
    31st July 2006
    Posts
    225

    launch lug sizes

    Can anyone tell me if its ok to use 3/16 LLs on a kit that calls for 1/8? I know not to go the other way, but I hate to change rods on site. and speaking of... I don't want to buy a new pad for my V2, but it has 1/4 LLs and I'm VERY tempted to put on 3/16. I know this is a no no, but has anyone tried it? is it the wieght of the model or the power of the E motors I need to be concerned about? or should I just retire my 30 yr old Portapad and get one that will except all three sizes? anyone have a suggestion for a pad? something not to bulky?

    "sorry honey! you'll have to change her diaper cuz I got wet glue on this model!"

  2. #2
    Join Date
    18th January 2009
    Posts
    2,652
    Too big of a launch lug is usually OK. You could even use a large launch lug with a smaller rod. A 1/4" rod is a good idea for rockets using E engines or weighing over 8oz. A 3/16 LL <i>might</i> work for your V2 if there is no wind.


  3. #3
    Join Date
    24th June 2006
    Posts
    364
    I've been thinking the same thing and I intend to try a larger lug on smaller models. I can't imagine it would do any harm. Quite the opposite. A thicker rod should result in less rod whip. However, the larger lug might result in more drag.

  4. #4
    Join Date
    25th June 2004
    Posts
    466
    I have gotten to where I use 3/16" lugs on almost all of my rockets. Our 1/8" rods are easily bent.

    You do lose some altitude due to drag, but the rocket should go straighter.
    Marty Wiggins
    NAR# 79744 Level 2
    NARTREK Gold

    Dorothy "How can you talk, if you haven't got a brain?"
    Scarecrow "I don't know, but some people with out brains do an awful lot of talking. Don't they?"

  5. #5
    Join Date
    18th January 2009
    Posts
    2,652
    It will go straighter off the rod, but the unbalanced drag of a launch lug may cause it to change direction a little.

  6. #6
    Join Date
    14th July 2006
    Posts
    1,601
    On all but "tiny" stuff I usee 5mm rods. Just makes more sense as the majority of my stuff calls for the bigger rod anyway...Keep it slick.
    "An armed society is a polite society." - Robert Anson Heinlein
    "Its a tale, told by an idiot, full of sound and fury, signifying nothing" - MacBeth

    My favorite vendor!
    http://www.jonrocket.com/index.html

  7. #7
    Join Date
    24th June 2006
    Posts
    364
    I slick my rods up with WD-40 before each launch. I thought of coating it with this stuff called "lock-ease." This is basically graphite suspended in a solvent. It does work well for car door locks but I'm not sure it would be good for launch rods.

  8. #8
    Join Date
    8th June 2005
    Posts
    448
    WD-40 is good for cleaning rods, but don't use it as a lubricant. You want your rods clean, smooth, and dry. Oils will cause exhaust particles to stick and cake up.

    Steel wool or Scotchbrite scrubbies do a good job of cleaning up after a launch.

  9. #9
    Join Date
    19th January 2009
    Posts
    2,334
    You might want to take a look at the current TRF thread Launch rods.

    Get good steel 3mm and 5mm rods. With the legs secured and with a decent 5mm rod fitted, a Porta Pad can launch some pretty hefty model rockets. Mine does.

    If the V2 is the Estes one, it should be alright on a good steel 5mm rod. You should, however, be concerned about weight and the power of the E9, but not for reasons to do with launch rods - I seem to recall reading elsewhere on the forum that because it has lower thrust than the D12, the E9 does not do very well with the V2...
    Don't just stand there, get one up!

  10. #10
    Join Date
    24th June 2006
    Posts
    364
    So what should I use for launch rod lube? Or should I just not bother lubing it?

    I did, in a fit of insanity, put some car wax on my launch rods. I'm sure it didn't stick at all. They shine up nicely with chrome polish though.

  11. #11
    Join Date
    14th July 2006
    Posts
    1,601
    Originally posted by Orporg
    So what should I use for launch rod lube? Or should I just not bother lubing it?

    I did, in a fit of insanity, put some car wax on my launch rods. I'm sure it didn't stick at all. They shine up nicely with chrome polish though.
    I clean my rods after a launch session but I only oil them if they are going to be stored for more than a couple days. I dry them completely before launch.
    "An armed society is a polite society." - Robert Anson Heinlein
    "Its a tale, told by an idiot, full of sound and fury, signifying nothing" - MacBeth

    My favorite vendor!
    http://www.jonrocket.com/index.html

  12. #12
    Join Date
    30th March 2009
    Location
    USA
    Posts
    437
    So what should I use for launch rod lube? Or should I just not bother lubing it?
    I use PAM cooking spray to wipe down each launch rod before and after a launch.

    Best regards,
    Brian
    www.BRSHobbies.com - Full line of model rocket products! Free shipping offer! No backorders or delays!

  13. #13
    Join Date
    21st March 2009
    Posts
    449
    Just a word, if you are going to use larger lugs, try to offset by putting them in the fin joint. Has worked well for me. I hate dealing with more than one rod.
    Brian

  14. #14
    Join Date
    5th March 2017
    Location
    Pittsboro, NC
    Posts
    365
    This probably is not your case but a warning against using "proper sized" lugs on lightweight models using the small (e.g. A3-4T, A10-3T, etc.) engines: the boost is often too weak to overcome the friction of a close fitting LL. I've had many gliders and smaller rockets seize up on the launch rod and never leave the pad because a very light breeze that misaligned them just a fraction from absolutely vertical.

    I believe it's not harmful if you decide to go up one size. Don't go sloppy loose, but too snug a fit--as I can tell you from sad experience--can be trouble if you're launching, say, a multi-stager or cluster.
    NAR# 103899

    "As I hurtled through space, one thought kept crossing my mind—every part of this rocket was supplied by the lowest bidder".
    — John Glenn, Jr.

  15. #15
    Join Date
    18th January 2009
    Location
    Maryland
    Posts
    11,663
    Random comments: I occasionally put two sizes of lugs on. This gives flexibility at club pads that usually have up to 6 positions with only one being 3/16". I also can upsize engines a bit. You can use 3/16" lugs on 1/8 rods as long as they are not too short. I have had one bind, but only one. If worried, put on two of them. I also have used a 1/8" lugs on MicroMaxx rockets and they work fine.
    Dick Stafford
    The member formerly known as the Pointy-Haired Moderator.
    The Original Rocket Dungeon
    Volunteer compiler of product news for ROCKETS Magazine

  16. #16
    Join Date
    5th March 2017
    Location
    Pittsboro, NC
    Posts
    365
    Quote Originally Posted by rstaff3 View Post
    Random comments: I occasionally put two sizes of lugs on. This gives flexibility at club pads that usually have up to 6 positions with only one being 3/16". I also can upsize engines a bit. You can use 3/16" lugs on 1/8 rods as long as they are not too short. I have had one bind, but only one. If worried, put on two of them. I also have used a 1/8" lugs on MicroMaxx rockets and they work fine.
    Best of both worlds, great suggestion!
    NAR# 103899

    "As I hurtled through space, one thought kept crossing my mind—every part of this rocket was supplied by the lowest bidder".
    — John Glenn, Jr.

  17. #17
    Join Date
    18th January 2009
    Location
    Maryland
    Posts
    11,663
    Quote Originally Posted by Rktman View Post
    Best of both worlds, great suggestion!
    I also like both buttons and a 1/4" lug. For the same reasons.
    Dick Stafford
    The member formerly known as the Pointy-Haired Moderator.
    The Original Rocket Dungeon
    Volunteer compiler of product news for ROCKETS Magazine

  18. #18
    Join Date
    18th August 2012
    Location
    Athol,Ma.
    Posts
    1,038
    I accidentally put 1/8" lugs on my Stormcaster and it flies fine even with a D motor off the smaller rod.
    Mike L.
    NAR #97175
    CMASS & MMMSC
    L1, LOC Cyclotron
    L2, Madcow Areobee Hi

  19. #19
    Join Date
    1st October 2014
    Posts
    58
    Yes is the simple answer.

    The graphite lock lube will stain your fingers and clothes and is difficult to clean off.

  20. #20
    Join Date
    15th October 2016
    Location
    Huntsville AL
    Posts
    1,874
    I'm amused to no end that the this thread was Necro'd by an innocent response to a Decade Old question

    "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

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •