Building the Estes Little Joe II: Tips, Tricks, and Modifications

Discussion in 'Low Power Rocketry (LPR)' started by James Duffy, Jan 28, 2016.

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  1. Feb 20, 2016 #121

    georgegassaway

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    True. I can see why a D12 was not universally recommended for all weather. But I'm going fly mine first on a D12-3, on a calm day, and see how it goes. I've flown a lot of models bigger and heaver than this on D12 power.

    The E30 just turns me off. It's not an Estes thing, it's a thrust level thing (I've seen a lot of scale model fly on a E30 that would have looked nicer boosting on an E15). One moment it is on the pad, the next it is streaking off crazy fast. I do not like for scale models to do that, unless it's realistic (like say the old Sprint ABM).

    So when I go with more than a D12, my first choice for an E will be the E15. I have flown my 1/39.5 scale models with E15-4's, and those weigh about twice what this kit does. I also understand that the E20 is pretty much like an E15, I looked at the thrust curves and they do look alike. Reload-wise, I'd probably use an E18.

    Also as I said a few messages up, if a person modified the model to fly on 29mm engines, I think the Estes E16 and F15 would fly it very nicely.
     
    Last edited: Feb 20, 2016
  2. Feb 20, 2016 #122

    georgegassaway

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    CA in general does not bond to plastic very well.

    The one CA I have used for bonding plastic to non-plastic (like wood or graphite to plastic) is Zap brand's "Plasti-Zap". It is a CA made for the purpose of bonding to plastic. Still not as good for plastic-to-plastic bonds as the proper kind of solvent cement that is meant for say ABS to styrene. But in this case, indeed I may go for that so that on a really hard landing the fins can pop rather than the wrap rip.

    [​IMG]

    It can be hard to find in hobby shops. But I do plan to go hobby-shop hopping tomorrow (checking out two stores i've never been to which are about a 30% detour from the main one I'm going to). So I may go for Plasti-Zap if I can find it rather than Weld-On 16 or an equivalent ABS-Styrene cement. Will also depend on the date on the price sticker, if it's over a year old it won't be as strong (which is why i have none I can use right now, been 2-3 years since I had a project that needed it and over time it went bad).

    If I find a good ABS to Styrene cement I will get that too, even if I do use Plasti-Zap for the fins. If only to attach the lugs. I do not want to repeat that nightmare with lugs popping off too easily

    - George Gassaway
     
    Last edited: Feb 20, 2016
  3. Feb 20, 2016 #123

    Donaldsrockets

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    Thanks for the tip on Plasti-Zap. I might have to hunt some of that stuff down. I only have one local hobby shop in my area. If they don't have it, I'll have to order it online.

    I do agree with you on the E30 not being "right" for this model. Let alone the fast un-scale lift off, the Blue Thunder propellant would give off the wrong visual effect while the White Lightning would be ideal.

    I currently have an unopened pack of E18-4W's in my box. That's what I plan to use in mine. I'm just wondering if I would need a longer 3/16 inch launch rod. I have looked around for 6 foot 3/16 inch stainless steel rods but they're a bit pricey. I think $22 was the cheapest I saw.
     
    Last edited: Feb 20, 2016
  4. Feb 20, 2016 #124

    Brent

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    I may as well see if my launch lugs will pop off as easy as the fins before I finish painting. I may go with some rail buttons as I don't have the rear centering ring on yet. Will have to see how easily they pop off. Sorry yours was looking fantastic.
     
  5. Feb 20, 2016 #125

    Trident

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    Good to know that this epoxy may work. I am about ready to try J-B Weld, which seems to bond to about anything.
     
  6. Feb 20, 2016 #126

    dixontj93060

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    JB Weld is not your best choice for plastics.
     
  7. Feb 20, 2016 #127

    Pat_B

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    James had mentioned the use of Parafilm for masking. It's an excellent product and can be found online from many sources much cheaper than MicroMark. I got 250' of it for about $33 a few years ago. That same quantity from MM would be about $120! It's a laboratory product used for sealing glassware and can be found online, especially at EBay, in long lengths at reasonable prices.
     
  8. Feb 20, 2016 #128

    JumpJet

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    I am very sorry to see what happened to your model. The plastic glue image in the instructions is just that and image stating to use plastic glue. All the different types of glue are represented by a generic type image. I never use plastic glue from a tube. The plastic glue I use when assembling Estes plastic parts is Tenax. CA works great too.


    John Boren
     
  9. Feb 20, 2016 #129

    johnnwwa

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  10. Feb 20, 2016 #130

    georgegassaway

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    So......

    I took some pics of the Apollo part of the model, which was not damaged.

    [​IMG]

    Busy with other stuff most of Saturday, so may not have anything else to post till Sunday night.

    - George Gassaway
     
  11. Feb 20, 2016 #131

    Brent

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    Pulled on my launch lugs they seam solid. I am going to leave them alone. I did lightly sand the spots where I glued them on.
     
  12. Feb 20, 2016 #132

    ep29030

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    I took a different approach when I built my Maxi-V2 a few years ago--I put 2 part foam inside the fins after the halves were joined together, then used polyurethane glue for the joints. If you give the foam overflow a place to go, to prevent pressure build up, foam does a great job with plastics. An unusual approach, but it works.
     
  13. Feb 21, 2016 #133

    grafgulch

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    You're right about the Tamiya paints. great stuff I picked up the colors you recommended. I payed more for the paints then the kit.

    Paul
     
    Last edited: Feb 21, 2016
  14. Feb 21, 2016 #134

    ericclinedinst

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    Oh no!!! I'm sorry to see this happened. Your Little Joe II is such a nice example of this rocket built. Heartbreaking. Hopefully you get it fixed and everything will be good again soon. :-/
     
  15. Feb 21, 2016 #135

    MaxQ

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    Yes, sorry to hear it but thanks for the heads up here. This does not bode well for landings with those low hanging fins.

    I seem to recall bad stories about plastic cements and certain scale Estes kits over the years - like the Star Wars series....some disassembled under thrust, using certain plastic cements.
     
  16. Feb 21, 2016 #136

    Donaldsrockets

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    Yep

    Issues like these are why I refuse to use Testor's tube cement. The liquid is ok but the tube stuff especially the non toxic tube stuff really sucks.
     
  17. Feb 21, 2016 #137

    georgegassaway

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    The tube stuff is pretty good for many purposes when gluing styrene to styrene. The Problem is the kit uses ABS for the vac-formed wrap, but then recommended Testor's type Tube Glue which does NOT stick (melt and bond) to ABS.

    Testor's liquid cement in a bottle is not good for ABS. And is not as good for styrene as Plastruct's Plastic-Weld. I usually only use Testors liquid cement when either I am out of the Plastic-Weld and can't wait to get more, or for some reason need a "weaker" liquid cement.

    What I got during my hobby store trip around town today was Plasti-Zap (CA made for bonding with plastic), and also Plastruct's "Bondene", for ABS and Styrene. I have never used Bondene before (it's a thin liquid type). I'm going to glue some plastic scrap parts tonight with Plasti-Zap and Bondene and check out the bond tomorrow. Then I'll choose which to use and glue the fins back on. Will probably use the Bondene for the lugs in any case.

    BTW - the Bondene.... I do not recall seeing before. I stopped by a new-to-me hobby shop that caters mostly to trains and plastic models. No R/C at all, though a few model rockets (this is a big reason I had not gone there before, no R/C stuff and nowhere near the rocket choices of the other shop. But still I wish I'd found out about them and gone there long ago). A treasure trove of modeling supplies and tools (as long as you are not looking for R/C supplies or airplane supples. Some balsa but not much better than Michael's supply of wood) And that is where I found the Bondene. And also found "Solvaset" there, the very powerful decal setting/softening solution, so I got a bottle for future projects.

    - George Gassaway

    [​IMG]
     
    Last edited: Feb 29, 2016
  18. Feb 21, 2016 #138

    georgegassaway

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    Glued the lugs back on with Plastruct’s Bondene.

    Glued the fins back on with Plasti-Zap.

    So, here it is, built.

    [​IMG]


    [​IMG]


    [​IMG]
     
    Last edited: Feb 29, 2016
  19. Feb 22, 2016 #139

    Flash

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    Great job George! I can see you are a true rocketeer. When the chips are down you pick yourself up and come back even stronger than ever. She is looking great after the mishap. Guess it's better to get all the problems ironed out before first flight. Just like with the full scale ones.
    Keep them flying George!
     
  20. Feb 22, 2016 #140

    smoon

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    Nice repair job George. After your mishap, I was worried that my fins (attached with Testor's liquid cement) would be subject to the same problem yours was. I gave one on my fins just the slightest push to the side and heard cracking. I knew this was the adhesive, so I pushed just a little more, and the fin popped right off. Thinking I could not use my Plastruct adhesives without damaging the paint, I looked for alternatives. What I ended up using was Loctite epoxy for plastic and roughing up all adjoining surfaces to give more surface area for adhesion. I will wait the indicated 24 hours for a full cure before any kind of strength testing.

    I re-did all four fins and the launch lugs. I have my fingers crossed that the Loctite product will hold.

    How are the wraps coming George? If my re-attached parts are as strong as needed, I will be ready for them.

    Steve
     
  21. Feb 22, 2016 #141

    Donaldsrockets

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    Looks great George.

    Can't even tell that anything happened to it.
     
  22. Feb 22, 2016 #142

    Sooner Boomer

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    Doing some on-line searching, Plastruct Bondene, Tenax 7R, and Ambroid Pro Weld all have as their main component methylene chloride (dichloromethane) (some have MEK as well). It's really expensive in those little 2 ounce bottles. Just like other rocket supplies (dog barf comes to mind) buying in bulk can save you a lot of monry. Some paint strippers use this as a main ingredient as well (it will remove cured epoxy). If you can find it, Savogran Superstrip Industrial Strength Stripper, contains Toluene, Methanol and Methylene Chloride - and should serve as an excellent welding-type cement for plastics. Read the labels or check MSDS of other paint strippers and you might find other brands.

    [edit]

    After a bit more internet work, I found that Kleen-Strip KS-3 Premium Stripper, contains methylene chloride, a bit of methanol, and possibly a touch of stoddard solvent. Home Depot lists it for $22.98 a gallon. Amazon has Plastruct Bondene for about $4 a bottle, and Tenax for about $8.
     
    Last edited: Mar 9, 2016
  23. Feb 22, 2016 #143

    tab28682

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  24. Feb 22, 2016 #144

    georgegassaway

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    I have the wrap files done for the Service Module, BPC, and LES motor. Also the General Dynamics / Convair plaque. I’m uploading them and writing up a post about how I used them. So I expect to post those later tonight.

    While I was working with old Little Joe drawings, I modified one to show the dimensions at 1/45 scale. Also, to note the “Proven to be Stable” CG location. Two models I did that had the CG a bit aft of there, sometimes flew straight, and sometimes went unstable. When there or forward, always stable.

    Update - made a correction and some tweaks to the drawing, including using blue text for the 1/45 dimensions

    - George Gassaway

    [​IMG]
     
    Last edited: Feb 23, 2016
    srfrich likes this.
  25. Feb 22, 2016 #145

    tmacklin

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    Beautiful drawing George. Seriously. :smile:
     
  26. Feb 23, 2016 #146

    Trident

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    If you go by the "Buy It By the Gallon" route, please let us know if it works the same. I do woodworking and buy solvents by the gallon, but decided to buy a bottle of Plastruct since I didn't want to do testing, and figured the little bottle would probably last me for years anyway.

    But it is always good to know if there are cheaper ways to accomplish the same thing.
     
  27. Feb 23, 2016 #147

    Sooner Boomer

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    $20 is a lot of money for me right now. I usually don't need more than an ounce at a time. I have a few contacts at OU that would give me a wee dram of solvent from their lab (if they haven't all retired or moved on). Come to think of it, if I could talk *them* into buying a gallon...
     
  28. Feb 23, 2016 #148

    georgegassaway

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    General notes for creating the wraps.

    These are PDF files, I hope they work for everyone. On my Mac, for whatever reason “Preview” did not work for them reliably , but GraphicConverter does. So if they do not work for your favorite graphics software, try some others.

    All of the wraps have size rectangles. Measure the prints to confirm if they are the correct size. You may need to enable edge to edge printing, and be sure they are set to print at 100%. If when you open, if you are asked for DPI, chose 300 DPI.

    I do not have a laser printer. I printed them on an inkjet printer, at high quality. Then I went to OfficeMax and had the SM Wrap printed in color, due to the yellow circles on two of the RCS thruster panels. I printed the BPC and LES wraps on a self-service B&W copier. I noticed later that the paper for the SM was a brighter white than the BPC and LES. So, I got the BPC and LES motor wraps re-printed on the color copier (for technical reasons, supposedly, the paper used in the “Color” copies won't work in a B&W self-service copier. OK, whatever). However, I did not end up changing the BPC wrap to the brighter paper. It looks more notable in the pics than in person.

    I chose not to use self-adhesive label paper for these because I was concerned about applying the wraps accurately enough to be properly aligned when the seam met the overlap. Others may prefer to use adhesive paper anyway.

    Now to begin with the wraps:

    Service Module Wrap.

    PDF file at: http://www.mediafire.com/view/607f1pw2jh2618r/SM-WRAP_145_Shift_to_Fin_1-.pdf

    [​IMG]

    Note this one needs Legal size 8.5 x 14" paper. The rest can use 8.5 x 11" paper. In the GIF above, I had to jump thru some hoops to convert it, which introduced a very pale yellow tinge. But the PDF file is fine, it's only the above GIF, which is not intended to be printed anyway.

    The wrap was cut out along the left edge of the black line on left, so that the line would appear after wrapping. The right side of the wrap, was cut just to the left of the dotted line, as a tab area. Note that there is no ending edge for the tab, so that any minor variations in width would allow a bit of margin of error

    [​IMG]

    Before beginning to apply the wrap, I cut out most of the rectangular areas for the RCS Quad locations, so that later the glue would attach to the tube, not soak into the wrap.

    The wrap had a 1/4” wide 1/2” long piece of double sided Scotch Tape applied to the underside of the tab area, half-way up. The wrap was placed on the body in the correct location to line up as indicated. Note that the overlap line is NOT at Fin 1, it is a bit left of Fin 1 because the long Service Module panel line used for the seam is not aligned with Fin 1. When correctly located, the left edge of the +Y and -Y black roll markings are aligned with the middle of the UNITED STATES lettering, and that the right edge of the triple black marking at +Z is even with the right edge of the long systems tunnel.

    The small piece of double sided tape helps to keep the wrap “tab” from moving, but does act a bit like a pivot point to allow the wrap to be adjusted in alignment. Now, before actually applying the wrap, I had placed the wrap face-down and applied double sided tape along the other edge, the edge near Fin 1, to stick not doubt 1/4 to 3/8” of the paper. Then I sued a metal straight edge and sharp blade to trim off the excess double sided tape along the edge and also along the top and bottom. When applying the wrap, when I brought it all the way around, I Pulled it tight and carefully placed the middle of the overlap over the tab, making sire it was aligned to match the other parallel lines. Once in place in the middle, then I pressed the rest of the paper down to complete the tape seam. This worked well, the resulting seam is not very noticeable compared to the printed line along most of the seam.

    [​IMG]
     
    Last edited: Feb 23, 2016
  29. Feb 23, 2016 #149

    georgegassaway

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    BPC Wrap.

    PDF file at: http://www.mediafire.com/view/fv0i5hpjmmdys9r/BPC_Wrap_A-004_v2.1-Layer#1.pdf

    [​IMG]

    This wrap was cut just inside the radius lines, so that there are no black radius lines visible. The outer edges are cut so that there are two splice joints, one at each end.

    [​IMG]

    As with the SM wrap, the BPC wrap was placed face down to apply double sided tape to one of the splice joints. The tape was applied to about 3/32” along the edge, then a metal straight edge was used to aid in using a sharp blade to cut off the excess tape. The wrap was then curled into a cone, the splice joints aligned to overlap each other, and the tape pressed into place to secure the edges. In the photo below, the splice joint shown in the middle (no black marking) is the actual one that was spliced.

    [​IMG]

    To hold the wrap in place, I just used a couple of small pieces of double sided tape under the +Y and -Y locations to keep it from sliding loose. Note that the capsule has “tick marks” molded into it. Those tick marks are aligned with the black roll marking for +Y, so use them to align the wrap.

    [​IMG]
     
    Last edited: Feb 23, 2016
  30. Feb 23, 2016 #150

    georgegassaway

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    LES Motor Wrap.

    PDF file at: http://www.mediafire.com/view/37z3b3v9292i6j9/LES_MOTOR_WRAP_145_3.0-Laye.pdf
    [​IMG]
    See the note on the wrap explaining the purpose of the two styles, due to the kit’s LES motor and nose cone parallel sides being shorter than they should be. Choose which. On mine, I had not yet made any modification to reflect the discrepancy. What I ended up doing was to use the #2 style, and cut away the upper part that included the canard and pitch motor. That is what I recommend. Those who want to be extra-accurate, then can use style #1 and make up their own conical wrap (Canard outline) for the LES nose tip.

    This wrap is cut carefully so that the conduit along the right edge will butt up against the conduit line on the left edge. There is about 1/4” overlap

    [​IMG]

    This one is hard to get to curl well, so I first wrapped it around a 1/2” dowel, careful to to crease it. Once it got some curl into it, then I wrapped it around a 3/8” dowel, To help to compress it, I used some scrap paper to wrap over it, taped the scrap paper tight, and let it sit overnight.

    To prepare to apply the wrap, I used a pencil to draw a parallel line on the LES tube (I will note that the tube was NOT painted, and NOT glued). In a previous attempt, I found that the yellow scotch tape was not tacky enough. So I used some high-tack scrapbook tape.

    [​IMG]

    I unwrapped the LES wrap, and placed it face down. Due to the curl, I placed a rule over it, parallel, and applied the high-tack tape to the overlap edge, for about 1/8-3/16” width. Then I applied at about 1/4” width of the high-tack tape to the other side. Each time there was excess tape overhanging the edge, which required trimming as with the other wraps.

    For applying the wrap, I placed the wrap onto the tube, even with the bottom end, and along the parallel pencil line. Then I slowly wrapped it around. It was a little bit off the first try, so I went back, adjusted a bit, then resumed. Finally got neat the overlap, and the parallel lines were aligned. So I pressed the middle of the seam into place along the overlap, and seeing that was tight enough I worked up and down to get it secured. I was pleased with how well it fit, just the right circumference for the two conduits to butt up exactly like they were intended to. So, the seam is not easy to see.

    [​IMG]

    When you DO glue the LES motor in place, be sure that it is aligned properly with the tower legs. The side with the conduits is aligned with the same side as the Hatch. Oops, in the photo above..... I do not have the LES tube aligned correctly with the tower legs. But the good thing is that it is not glued on yet. :)
     
    Last edited: Feb 23, 2016

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