Comanche 3 stage joiners

Discussion in 'Low Power Rocketry (LPR)' started by Kwaziithepirate, May 3, 2019.

Help Support The Rocketry Forum by donating:

  1. May 3, 2019 #1

    Kwaziithepirate

    Kwaziithepirate

    Kwaziithepirate

    New Member

    Joined:
    May 3, 2019
    Messages:
    3
    Likes Received:
    0
    Gender:
    Male
    Hi,

    Making a Comanche 3 with my son. This will be our 3rd rocket after the Ricochet and the one that has the two gliders. I have noticed the joiners that hold the stages together are very tight. The instructions recommend putting cellotape on the joiners to make sure its a firm fit. But I am worried its too tight already and will not release. Should I expect these to be tight?

    thanks
    Kwaz
     
  2. May 3, 2019 #2

    Banzai88

    Banzai88

    Banzai88

    Lvl 1,Wallet....Destroyed

    Joined:
    Jul 15, 2015
    Messages:
    1,856
    Likes Received:
    185
    You should expect that the humidity levels of the day will always have an effect on the fit. Most of us just sand them until they slide smoothly. Tape only if it gets too loose.
     
  3. May 4, 2019 #3

    Kwaziithepirate

    Kwaziithepirate

    Kwaziithepirate

    New Member

    Joined:
    May 3, 2019
    Messages:
    3
    Likes Received:
    0
    Gender:
    Male
    OK, thanks for that, sanding coming up. Will need to be careful as they are quite thin.
     
  4. May 4, 2019 #4

    blackjack2564

    blackjack2564

    blackjack2564

    Crazy Jim's Gone Banana's

    Joined:
    Jan 18, 2009
    Messages:
    8,632
    Likes Received:
    717
    Location:
    Savannah Ga
    Soak with thin Ca [superglue] then sand,makes for stronger coupler and slicker fit.
     
  5. May 6, 2019 #5

    Kwaziithepirate

    Kwaziithepirate

    Kwaziithepirate

    New Member

    Joined:
    May 3, 2019
    Messages:
    3
    Likes Received:
    0
    Gender:
    Male
    Thanks blackjack, have plenty of CA so will give that a try.
     
  6. May 6, 2019 #6

    DaveW6DPS

    DaveW6DPS

    DaveW6DPS

    Well-Known Member

    Joined:
    May 28, 2013
    Messages:
    285
    Likes Received:
    122
    Gender:
    Male
    Location:
    Barstow, CA
    Remember to tape the second stage and sustainer motors together. They should also have a good friction fit in motor tube. This is especially true for the sustainer, since there may be no deployment if it kicks out.

    The stages need to hold together long enough to light the next stage. Then you want a clean separation. So too tight is just as bad, maybe worse than too loose. The Comanche 3 is a bit ambitious with no staging experience. Maybe build and fly a Mongoose or another two stage a few times before going for three? I have found the Mongoose to be the easiest two stage that I have flown.
     

Share This Page