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  1. #1
    Join Date
    28th May 2015
    Posts
    44

    Carbonette 19 R/C BG/DLG

    This has to be the most fun I've ever had with an R/C airplane. I bought a Whipit two years ago and liked flying it, but it proved very fragile, especially in the nose, and the battery is prone to ejecting. So my nose-less Whipit sad in a corner until December, when I stole the brick dangling from its nose and put it in this thing. The nose won't break off this one so easily, and I've yet to eject a battery.
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    Launches nice and high too.





  2. #2
    Join Date
    16th August 2016
    Location
    Paragould, Arkansas USA
    Posts
    445
    Can you show some pics of the servo setup, and control linkage?

    "Lock S-foils in attack position....."

  3. #3
    Join Date
    28th May 2015
    Posts
    44
    Quote Originally Posted by Crawf56 View Post
    Can you show some pics of the servo setup, and control linkage?
    Lousy photo:
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    Better idea...the instructions for building it. Start around the 44 minute mark.

  4. #4
    Join Date
    19th January 2009
    Location
    Georgetown, Texas
    Posts
    651
    Very cool! When will this be available for purchase?

    James
    ____________________

    James Duffy
    www.spacemonkeymodels.com

  5. #5
    Join Date
    28th May 2015
    Posts
    44
    Quote Originally Posted by James Duffy View Post
    Very cool! When will this be available for purchase?

    James
    They're available now. http://jhaerospace.com/product/carbo...-boost-glider/

  6. #6
    Join Date
    19th January 2009
    Location
    Georgetown, Texas
    Posts
    651
    Quote Originally Posted by Maxout View Post
    Order placed! Looking forward to the build!

    James
    ____________________

    James Duffy
    www.spacemonkeymodels.com

  7. #7
    Join Date
    28th May 2015
    Posts
    44
    Quote Originally Posted by James Duffy View Post
    Order placed! Looking forward to the build!

    James
    Sweet. It'll ship out today or tomorrow. Enjoy!

  8. #8
    Join Date
    19th January 2009
    Location
    Georgetown, Texas
    Posts
    651
    Quote Originally Posted by Maxout View Post
    Sweet. It'll ship out today or tomorrow. Enjoy!
    My kit arrived today, and the parts look great. I look forward to getting to work on this as soon as I get NARCON in my rear view mirror!

    James
    ____________________

    James Duffy
    www.spacemonkeymodels.com

  9. #9
    Join Date
    22nd September 2014
    Location
    Sacramento, CA
    Posts
    38
    Got mine in the mail yesterday. It looks great. Can't wait to get it going but it's #3 in the queue!

    William

  10. #10
    Join Date
    28th May 2015
    Posts
    44
    Quote Originally Posted by WFWalby View Post
    Got mine in the mail yesterday. It looks great. Can't wait to get it going but it's #3 in the queue!
    Boy I know that feeling!

  11. #11
    Join Date
    19th January 2009
    Location
    Georgetown, Texas
    Posts
    651
    With NARCON behind me (except for the paperwork) I've had a few spare hours this week to invest in starting work on the Carbonette 19. Using Josh's endearingly crude yet very effective and complete video instructions*, the wing has been successfully shaped. This took about an hour, admittedly because I had been down this road using similar techniques while building a North Coast Rocketry North Hawk RC/BG, a very similar kit. All shaping and sanding was done outside due to the cataclysm of balsa shavings and dust that ensued.

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    This task was made much simpler due to the use of a Master Airscrew razor plane, as well as a 12" sanding bar. An assortment of sandpaper down to 600 grit was then used to refine the shape, after which a bit of clear dope was applied to seal the wood. Yeah, it adds some weight, but I like the vibe.

    Don't expect too many updates on this thread, as the simplicity of the build and the completeness of Josh's instructions make a traditional build thread redundant. I will suggest, however, that this kit is about as simple as a wood RC kit could possibly be. The engineering is just fantastic!

    James

    * Josh: my wife is appalled at what you've done to your wife's dining room table. <VBG>
    ____________________

    James Duffy
    www.spacemonkeymodels.com

  12. #12
    Join Date
    19th January 2009
    Location
    Georgetown, Texas
    Posts
    651
    A minor deviation from the kit instructions: instead of using the supplied polyester hinge material on the control surfaces, I elected to simply use Monokote hinges.

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    More later,
    James
    ____________________

    James Duffy
    www.spacemonkeymodels.com

  13. #13
    Join Date
    19th January 2009
    Location
    Georgetown, Texas
    Posts
    651
    With the tail surfaces hinged we are able to mount them on the tail boom using medium CA.

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    The pushrods have been inserted temporarily just to check for clearance and operation. Construction will pause at this point because I don't have a receiver brick handy. One is on the way, though, and should be here early next week.

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    At this point basic construction of the glider is complete, save for the radio installation. Next up is the launch pod build, which is really no different than building an Alpha with a single funky fin. I won't be documenting any of that unless I decide to do anything unusual.

    This has been a really fun, quick build, and I can heartily recommend the kit. The Carbonette 19 will inevitably be compared to the NCR North Hawk, but I'll hold off on comparing the two until I have a chance to fly both. I will share, however, that I have enjoyed building both kits!

    James
    ____________________

    James Duffy
    www.spacemonkeymodels.com

  14. #14
    Join Date
    19th January 2009
    Location
    Georgetown, Texas
    Posts
    651
    Knocked out the boost pod this afternoon, changing a couple of minor things from Josh's original design. First, I converted the Kevlar shock cord to an internal design, thinking that it would reduce the possibility of the recovery system tangling with the glider at ejection (the dreaded "Red Baron!"). Next, in order to provide an anchor for the shock cord, an 18mm engine block was added. If I had a loose engine hook on hand I would have added one. Tape will have to suffice for engine retention.

    Next, the shock cord anchor at the nose cone end was tweaked. The plans call for the builder to cut a slot across the base of the nose cone, then thread the shock cord through that slot. I'm sure that would work fine, but I decided to go another way. First, a small craft bead (~1/8" diameter) was liberated from the craft supplies of La Esposa. A small hole was drilled into the base of the nose one, the shock cord knotted to the bead, and the bead glued into place in the hole.

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    The rest of the pod was built as directed in the instructions. I'll ditch the streamer supplied with the kit, and add a replacement using some unobtainium graciously supplied by Steve Kristal for FAI altitude models.

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    The rocket is essentially complete at this point. All that remains is to install the receiver brick when it arrives next week, and to splash some color on the wingtips to aid in-flight visibility.

    James
    ____________________

    James Duffy
    www.spacemonkeymodels.com

  15. #15
    Join Date
    19th January 2009
    Location
    Georgetown, Texas
    Posts
    651
    The receiver brick for the glider arrived today, and installation was a bit of a mixed bag. The pushrods were a bit fussy and difficult to wrestle into place, but eventually they were persuaded to behave. I messed up one of them in the process, but fortunately had a replacement on hand: a .011" high E string from a pack of guitar strings.

    A decision was made to augment the elevator control horn surface with something more substantial than the stock 1/64"-thick ply stock. After mulling it over for a while, I punched a 3/16" diameter disc from a sheet of .020" thick styrene, glued it to the ply horn part, then drilled a tiny hole through it. The resulting component is better and stronger, and added an inconsequential amount of mass.

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    I had not previously used the hot glue recommended in the directions for receiver assembly before, but the results were fantastic. I'll add the hot glue gun to the bag of tricks for future projects.

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    The CG was right on the recommended point, so it took to the air for a few test glides. I reduced the elevator throw a bit, increased the rudder throw, and added dual rates. It glides beautifully, and I look forward to flying it under rocket power soon!

    James
    ____________________

    James Duffy
    www.spacemonkeymodels.com

  16. #16
    Join Date
    28th May 2015
    Posts
    44
    Quote Originally Posted by James Duffy View Post
    The CG was right on the recommended point, so it took to the air for a few test glides. I reduced the elevator throw a bit, increased the rudder throw, and added dual rates. It glides beautifully, and I look forward to flying it under rocket power soon!

    James
    James,

    Thanks very much for putting up this build series. It's good to see someone else figuring out the nuances of this machine. I have to agree with you that linkages are a pain in the neck on these small models. It's a constant balancing of weight and tiny parts. I do like the little stiffeners you've placed on the control horns.

    One word of caution: I have yet to have any success with monokote hinges on these planes. They work great for a couple weeks, then the humidity takes effect, and the stab warps and locks the elevator. This is why I emphasize in the instructions placing hinge material on both sides of the tail surfaces--it becomes an issue even with the polyester hinges. I haven't investigated whether monokote on both sides would help with the warping. I do know that we tried thin heat activated mylar (basically super light monokote) on an early Carbonette prototype, and the engine exhaust, uhm, removed it. Monokote shouldn't be as vulnerable, but I'm rather gunshy now.


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