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  1. #1
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    11th February 2017
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    Rocket landed in water, restoration tips?

    I was fortunate that a fisherman in a boat recovered my Nike Smoke rocket after it landed in a canal. After it dried out , it looked as good as new, but now I'm starting to notice some issues. The biggest problem is that I can't remove the motor, guess the water caused the motor tube to contract. I've tried pushing it out with a broom handle with substantial force but it won't budge, and I'd damage the rocket if I applied more force. I have it out in the sun for now, hopefully it will loosen, if not we may have to try to drill it out. Any better ideas? Another issue is that the top end of the body tube is no longer perfectly round and the layers of paper have separated a bit. I was thinking about applying some glue into the cracks and then putting the nose cone in so when the glue dries the tube will be nice and round. Should that work?
    Thanks,
    Bill


    L1 3/25/17 H135
    L2 8/12/17 J180

  2. #2
    Join Date
    14th March 2009
    Location
    Ohio
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    3,050
    I've used super glue to rebond the tops of body tubes, but be careful with sticking a nose cone into an area with any kind of wet adhesive.

    You didn't say what kind of motor it was, but when black powder motors get wet they tend to swell. I would try knocking the clay nozzle out of the motor. Then you can TRY to peel off the motor case layer by later from the inside. Easier said than done, but a reasonable first step that shouldn't damage the rocket.

    If your motor was not black powder than you have to try something else. Once the rocket is dried out I would throw it in the freezer. The case might shrink more than the motor mount and you could hopefully work the motor out with a dowel and hammer. Try to use a dowel just a little smaller than the motor mount.

    Good luck.

    Zeus-cat
    NAR# 92125 L1
    Total Impulse for 2017: 1,493.8 N/s Flights: 56
    2017: 1/2A:0, A:6, B:11, C:2, D:12, E:4, F:1, G: I have NEVER launched a G motor, H:1, I:1

  3. #3
    Join Date
    11th February 2017
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    south Florida
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    Thanks for the reply, the motor is an AT G78-7G composite, see
    http://web4.hobbylinc.com/gr/aro/aro77407.jpg

    The rocket is probably too big for my freezer, but I'll try that. Problem with the dowel and hammer (also tried twisting motor end with pliers) is that it seems like too much force will damage the body tube and/or motor mount.

    L1 3/25/17 H135
    L2 8/12/17 J180

  4. #4
    Join Date
    30th January 2016
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    Did you friction fit this phenolic case with tape? If so, that tape is now glue. I'd try tapping the throat and loctiting an eyebolt in.

    Any hook or screw-on retainers, tailcone? If it's a flat base I'd pull the eyebolt through a pipe.

  5. #5
    Join Date
    11th February 2017
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    I don't think there was tape on the motor but not sure. There is an AT retainer, no hook or tailcone. So you suggest gluing an eyebolt to the end of the motor and pulling it through a pipe? Guess that would ease the stress on the body tube, hope the bulkhead is strong enough. Would spraying with silicon or WD-40 help?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Nike Smoke with stuck motor.jpg 
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    L1 3/25/17 H135
    L2 8/12/17 J180

  6. #6
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    Perfect, if your pipe just barely slides over the AT ring you should basically be home free! I'd switch to all thread if available, then use a fender washer and a bolt.

  7. #7
    Join Date
    27th March 2013
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    Too late to do it now, but perhaps if/when you get the motor out... Try using something like Minwax's Wood Sealer on the inside of the body/motor tube. If it doesn't absorb water, it'll reduce the amount of potential damage from water.

    All The Best!
    Jim
    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

  8. #8
    Join Date
    14th March 2009
    Location
    Ohio
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    Put the rocket in a trash bag before putting it in the freezer. Just in case any crud falls out of the rocket.
    Zeus-cat
    NAR# 92125 L1
    Total Impulse for 2017: 1,493.8 N/s Flights: 56
    2017: 1/2A:0, A:6, B:11, C:2, D:12, E:4, F:1, G: I have NEVER launched a G motor, H:1, I:1

  9. #9
    Join Date
    15th September 2009
    Location
    Silverton, Oregon
    Posts
    789
    Use a drill and/or Dremel tool to open up the aft end of the motor case. Then use a hacksaw blade to split the motor casing lengthwise. You should be able to knock it out with a dowel and hammer fairly easily.

    Dan Feller
    Silver Crest Rocket Club

  10. #10
    Join Date
    18th January 2009
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    I've had good luck using those dessicant packs that seem to come in everything lately. Just pour the packs into the body tube and leave them there for a day or two. This seems to extract the moisture out of evrything.

    No guarantees on loosening up the motor casing but it might be worth a try.

    Have heard that uncooked rice will do the same thing.

    Keep this trick in mind if you ever drop your smartphone into water.
    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)

  11. #11
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    11th February 2017
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    south Florida
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    Well, this is not good. I put a pipe over the end and applied pressure, but the motor tube started coming out instead of the motor. Guess next I'll try RockerFeller's idea, cut off the end and saw the case. Hopefully the motor tube is not permanently damaged.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Nike Smoke with stuck motor 2.jpg 
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    L1 3/25/17 H135
    L2 8/12/17 J180

  12. #12
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    If the motor tube comes out, you can slot a new one in fairly easily.

  13. #13
    Join Date
    23rd November 2013
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    2,090
    I agree with dhbarr, at this point pull the motor tube, carefully salvage your retainer, and then replace the motor tube with new.

    Shove a new candle in that baby and let it fly!

  14. #14
    Join Date
    11th February 2017
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    south Florida
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    Pulled it out and definitely need a new motor tube, the original one is shredded. It appears that replacement will not be easy, as there are remnants of the old tube quite far up in hard to reach places, such as the upper centering ring. Once cleaned out, it may be tough to glue the new tube to the upper centering ring, the fins, and other hard to reach spots.

    Is there any type of local source (e.g., Home Depot) for a new tube? They only cost a dollar or two from rocketry vendors, but they want 6 to 10 dollars for shipping. May have to wait until I need other items and then order all at once.

    L1 3/25/17 H135
    L2 8/12/17 J180

  15. #15
    Join Date
    21st December 2013
    Location
    Australia
    Posts
    416
    How about using a file to remove the remaining old tube. Another possibility would be a dowel with sandpaper attached.
    QRS: 124
    AMRS: 32 L2
    Highest Altitude: 10,849 feet
    Largest Motor: CTI 1115J530 IM
    Current Projects:
    Purple Parrot, X Wing


  16. #16
    Join Date
    11th February 2017
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    Dowel with sandpaper appears to be my best hope, at least to clean out the upper centering ring, which is beyond the reach of my longest file.

    L1 3/25/17 H135
    L2 8/12/17 J180

  17. #17
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    OK, I got the new motor mount installed, it took patience to get the remains of the old one out.

    Now I've noticed that the nose cone no longer slides properly into the body tube, guess water contracts cardboard. I've tried sanding the sleeve of the NC but that didn't help much, may need some sort of electric grinder.

    L1 3/25/17 H135
    L2 8/12/17 J180

  18. #18
    Join Date
    18th November 2014
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    Somewhere in Ohio
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    Quote Originally Posted by billdz View Post
    OK, I got the new motor mount installed, it took patience to get the remains of the old one out.

    Now I've noticed that the nose cone no longer slides properly into the body tube, guess water contracts cardboard. I've tried sanding the sleeve of the NC but that didn't help much, may need some sort of electric grinder.
    Do you have a Dremel? Those work pretty well in those situations.
    Thanks,
    Andrew - 13 year old rocketeer who loves to watch and fly model rockets all year long!!!
    2017 - 218.4 Ns _ Biggest motor, AT G125T, highest flight around 3,500'
    TRA Member #17056
    Andrew "Rockets Rock!" B.
    Owner, Andrew's Rocketry Shop - andrewsrocketryshop.blogspot.com

  19. #19
    Join Date
    16th February 2017
    Posts
    131
    I feel your pain. Had three water landings w/cardboard rockets and none ended well. Thinking of going to fiberglass /G10 exclusively just for that reason.

  20. #20
    Join Date
    18th November 2014
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    Somewhere in Ohio
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    551
    Flew a rocket, landed in a small tree, and then the heavy rain came. 2 days later, it was pretty damaged, the motor was stuck. When, I got my Dremel, it took the motor out and worked really well.
    BTW, it was cardboard.

    Thanks,

    Andrew - 13 year old rocketeer who loves to watch and fly model rockets all year long!!!
    2017 - 218.4 Ns _ Biggest motor, AT G125T, highest flight around 3,500'
    TRA Member #17056
    Andrew "Rockets Rock!" B.
    Owner, Andrew's Rocketry Shop - andrewsrocketryshop.blogspot.com

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