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  1. #1
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    AeroTech Hobbyline RMS Assembly Diagrams, Videos

    In response to this thread , I have modeled the AeroTech 18/20, 24/40, and 29/40-120 motors with a CAD program to create cross sections and exploded views that will supplement AeroTech's instructions. I played with the "animate" feature of the CAD program (SolidWorks) to create videos of the assembly process.

    All of my references came from the AeroTech website. Their "Resources" page is very handy and contains lots of information if you haven't visited it before.

    Enjoy!


  2. #2
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    18/20 Assembly

    Here is the cross section and exploded view of the 18/20 motor with a D13-4W reload.

    The video is on Flicker: 18/20 motor with a D13-4W reload

    Attached Files Attached Files

  3. #3
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    24/40 Assembly

    Here is the cross section and exploded view of the 24/40 motor with a E18-4W reload.

    The video is on Flicker: 24/40 motor with a E18-4W reload
    Attached Files Attached Files

  4. #4
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    29/40-120 Assembly

    Here is the cross section and exploded view of the 29/40-120 motor with a G64-7W reload.

    The video is on Flicker: 29/40-120 motor with a G64-7W reload
    Attached Files Attached Files

  5. #5
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    BTW a couple items I have gleaned from reading various threads on these reloads that I want to share here...

    Quote Originally Posted by jimzcatz View Post
    Something to remember with ALL Aerotech RMS loads, be it hobby or High Power. Always, I repeat ALWAYS make sure the forward closure is on all the way. If the rear does not go all the way thats not a big issue, as long as you seat it as far as it will go. This comes from Gary R personally several years ago. I have found that if I tighten the forward first, and then the rear they will usually seat properly. I have no blow-by issues...ever.
    from this thread regarding the ejection charge after the cap is applied (not shown in my renderings)...

    Quote Originally Posted by stantonjtroy View Post
    I had the exact same thing happen with the same case/load. Killed my first Interceptor E. I have to agree with the assesment of the powder not seating all the way down in the well. On mine I assembeled and loaded the motor in the rocket but was unable to launch for a couple hours. In that time it was turned in every direction one can imagine (my then 9year old engaging the enemy at warp speed). I failed to point it up and tap it to ensure proper seating of the powder and it met it's demise in the manner you've described to the letter. Since then I always give the lower end of the rocket a couple taps/knocks to be sure the powder is seated and have not had a repeat of the problem. I won't say for sure that was the problem but the results do seem to support it. FWIW
    finally from several posters, go light on the grease for the o-rings and keep it off the propellant and delay grains!
    Last edited by rocketguy101; 21st July 2012 at 02:30 PM.

  6. #6
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    The biggest problem I have with the Hobbyline set of motors is the instructions clearly state to build it with the igniter installed but most clubs won’t allow you to do that.

  7. #7
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    Quote Originally Posted by boomtube View Post
    The biggest problem I have with the Hobbyline set of motors is the instructions clearly state to build it with the igniter installed but most clubs won’t allow you to do that.
    Yeah, I can usually slide one in after assembly, but I ran into the problem once of an igniter popping and not lighting the motor. I pulled it out, and the replacement(s) did not fit through the nozzle I tried a couple Copperheads, some Sure Fires, and some Estes PSII igniters...all them had an extra-large pyrogen blob!

    I gave up and brought the motor home, unscrewed the retainer, and gently pulled the nozzle out taking care to not touch the o-ring and knock the ejection cap off. I inserted the igniter and re-assembled the motor. It successfully flew at the next launch. Later I read here on one of the igniter threads that you can scrape some of the extra pyrogen off in order to get the igniter fit through the assembled nozzle. Since I bought one of the AeroTech igniter clips from Hobbylinc, I have not had any Copperhead misfires.

  8. #8
    Join Date
    29th July 2012
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    862
    ^^-- Not much worse than single use, although it would be nice if there was a little table or something out on the range rather than having to leave all helpful work aids behind.

    With the 24/40, I think I'm using the case tube backwards (not that it matters), but I align the grain slot with the thick line on the outside to make it easier. Doesn't work with the 29s though because the grain rotates when tightening the aft closure.
    :dark:

  9. #9
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    20th January 2009
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    Quote Originally Posted by boomtube View Post
    The biggest problem I have with the Hobbyline set of motors is the instructions clearly state to build it with the igniter installed but most clubs won’t allow you to do that.
    Actually only TRA clubs prohibit it. NAR permits it for model rockets.

  10. #10
    Join Date
    22nd September 2017
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    627
    At my TRA level 1 cert, the other flyers backed by a range officer had a long winded serious story of a high powered rocketry L-3 , M-class motor with igniter inserted away from a flight line launch pad knocking out a section of a wall of a motel from inside a room. I do not think that group of people were talking crap. A flyer with his wife were able to tilt the motor away from themselves or other people nearby as it ignited. No igniters were near our HPR models on the bench with motors fully assembled in full view. Beyond the flightline the RSO held my igniter with my rocket on the pad, until it was time to connect the igniter to his electronic launch clamps, and at that point I had permission to insert the igniter into the casing and coil the wire around the clamps. It is something TRA takes seriously and after that story, I don't have a problem with them taking an extra safety measure to reduce risks.

    A low power motor wouldn't have the damage involved, but you could still reduce risks of it igniting by keeping igniters away until it is ready to fly. Or another way would be build it with the RSO next to you at the pad if its easy and quick to build, because you are allowed to handle the igniter at that point if you were limited to TRA events.

  11. #11
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    23rd July 2011
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    AeroTech Hobbyline RMS Assembly Diagrams, Videos

    Quote Originally Posted by bobkrech View Post
    Actually only TRA clubs prohibit it. NAR permits it for model rockets.
    Tripoli prohibits inserting igniters in high power motors except at the pad and with the rocket pointed away from people. Because Tripoli has no model rocket safety code we donít actually prohibit the practice in model rockets.
    Nevertheless, we fully support local Prefectures who implement such a rule.

    Last edited by Steve Shannon; 14th October 2017 at 03:12 AM.
    Steve Shannon
    L3CC, TAP, Director, Tripoli Rocketry Association

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