Planes, Trains, Bots & Games (and a few gadgets too)

The Hobby Guy

February 1st, 2010 at 9:46 pm

Split Stik – The Plan Is Here


The Split Stik

The Split Stik is my latest design and it is featured in the current issue (Winter 2010) of Park Pilot Magazine. For those of you looking for an electronic copy of the plan,  here it is for you to download.

I had a lot of fun with this design.  It started as a quick sketch and me and my oldest son, Paul, tinkering in the workshop. We had it built and flying in no time.  Now, that does not mean we did not have some designs flaws.

One of those early flaws came out at the field flying while we were doing some loops.  All of a sudden we noticed something that made both of us do a double take – the wings were inverted with a downward dihedral.   At first I thought he was flying inverted and was amazed how did he do it. Then I noticed that something was truly not right.  It looked sort of like when the wind blows an umbrella the wrong way. It turned out the tape we used on the carbon fiber spar had come off and there was nothing holding the carbon spar to the wing.  It was the weirdest sight, but the plane still flew and we landed it right away.  We fixed it and some other minor glitches along the way, but all in all it is true to that original sketch.

For all of you who are building the Split Stik, I would love to see some pictures of your build. If you need any help, or have any questions, please let me know. I will do what I can to help out.

18
  • 1

    Hobby Guy : The electronics you reccomend for the Split Stick are priced at over $ 100 ! Could you reccomend something more reasonable like from Ebay or Hobby King?
    The wing fixation on the Splitstick seems to be pretty rigid & unforgiving in a crash. How about the wing with carbon rod attached with rubber bands to body pegs? Thanks! WR

    Bill Rickman on February 10th, 2010
  • 2

    HI,
    Sure. The Hobby King 10g Brushless motor was the first motor I used for the design. You can find it here: http://bit.ly/9zp6ZT

    Also, you can substitute similar sized micro servos from HK, and ESC, and Battery.

    I like the idea for the wing, try it out and if it works I will post it here as an option.

    Thanks,
    Paul

    TheHobbyGuy on February 10th, 2010
  • 3

    Hi Paul,
    I really like your split stik. I first saw it in Park Pilot winter 2010 issue. I have cut the foam parts. I have looked in all the hobby shops in the DFW area and have been unable to find the 3mm Carbon Fiber Rod (3.2mm CF is the closest I could find)or the 3/8 by 3/16 spruce. Also am interested in finding less expensive but equivalent power system. If not, then I will purchase the Eflite Park 180. Already have the Eflite 10A ESC. I have some Turnigy TG9 servos, I’m not sure if they will work for this. I guess the battery can be a 2 or 3 cell 350-500 lipo. I guess I can order the spruce and CF online. Just wondering if you know other places besides hobby shops I can look or if there is something I can substitute. Thanks for any info on this. I thought I had seen your number somewhere and was going to call you but I could not find it again.

    Ernie W on February 12th, 2010
  • 4

    Ernie,
    Thank you. 3.2mm would be fine – its not so critical, just as long as it is CF so it can flex yet remain strong. The spruce you probably can find in the Midwest Balsa section of a Michaels Craft store, AC Moore, or other craft store. if you can not find it, then try 3/16 x 1/2 x 36 (midwestproducts.com). Or get as close as you can. The spruce is strong yet still light.

    Also, for motor, the Hobby King 10g Brushless motor was the first motor I used for the design. You can find it here: http://bit.ly/9zp6ZT Also, you can substitute similar sized micro servos from HK, and ESC, and Battery.

    I would love to see some pics when it is done.

    If you have more questions, please let me know.

    -Paul

    TheHobbyGuy on February 12th, 2010
  • 5

    Hello Paul. I red about your split stick in Park Pilot. Would like to build it but I am having problems with the PDF. When I print the pages they do not line up. I was wondering if you could publish the whole plan on one page. I have access to large format printer so I can print the whole plan on one page.
    Thanks

    Wallace Edwards on February 28th, 2010
  • 6

    Sure. No Problem. I will post the full file as well.

    TheHobbyGuy on February 28th, 2010
  • 7

    Our club members seem to have fallen in love with the design, however, everyone seems to be harboring E-Flite 250 motors from their indoor flying. How much would you reccomend enlarging the design to accept the E-Flite 250 brushless motor? Would you also reccomend going to the 5mm Cellfoam as well?

    Thanks

    Greg on March 29th, 2010
  • 8

    Cool. I am glad they like it! I would love to see a group shot with everyone. I think you will be fine scaling it up a bit – try just going up about 20% and for the stick just use two stick side by side. The e-flit 205 should be fine then.

    TheHobbyGuy on March 29th, 2010
  • 9

    Hi Paul,

    Can you tell me which is the right diamension for the wing length. If I use the tiled format I get a wing that is about 23″ long if I print the full scale I get a wing that is 30″ which is the correct one?

    Thanks

    Dan on March 30th, 2010
  • 10

    Hi – The wing is 23 inches. The tiled on is correct.

    TheHobbyGuy on March 30th, 2010
  • 11

    Greetings Paul,

    When I printed the PDF file at 100% I expected the wooden boom to measure 24″ as stated in the Park Pilot magazine article, the actual measurement from the tiles was 14″. At 100%, what is the correct boom measurement 14″ or 24″?? Thanks, Conrad

    Conrad R on June 9th, 2010
  • 12

    Hi. That should be correct, about 14 inches, as long as on the plan the wing is 23″ you are at 100%. The 24 inch reference for the wood was of the material to purchase.

    TheHobbyGuy on June 10th, 2010
  • 13

    Paul: My Split Stick : Motor– Hobby King 1811-2000. Material: 5.5 mm foamfold. servos–Towerpro micros.
    Allup wt.: 5 1/2 oz.Have tried 5 to 6 in props with 3 to 5 twist. Does’nt fly well– difficulty gaining altitude as though needs more power or less wt.
    Had to add two 7 gm wts behind motor to balance.
    Short of redoing the whole plane to your exact specifications, cuold you reccomend a stronger motor-prop combination that will get it flying?
    If you send me your Email address, I will send some Pics of my stick which show my center pylon giving immediate changes and variation in the dihedral.
    Thanks for your help,
    Bill Rickman Edina MN

    Bill Rickman on November 15th, 2010
  • 14

    HiPaul,
    just printed plans for Split Stick. trying to use salvaged parts. i have a Graupner Speed 300 brushed from their foam Cub. Would this work for SS ?
    Thanks, Warren

    warren whittemore on May 13th, 2011
  • 15

    it should work. how large / heavy is it? you may just need to scale up the plane size a bit…..

    TheHobbyGuy on May 15th, 2011
  • 16

    Hello again Paul,
    Building from plans d/ld’d. Having some difficulty. What strength fishline did you use? I tried fairly light stuff, about 10 lb test. Its what I had. Problem is that the line cuts the foam so easily the carbon relaxes and goes pretty much flat. Or is my line stretching? 3.2mm seems a bit stiff would 2mm do? I may try a wood dowel or strip (spruce) in place of carbon.
    Also plan does not give dim to locate wing. I notice in pictures on the site, that it looks like the wing is much farther back than shown on plans. Measuring plan shows wing leading edge to be 1 3/8 back from front surface of motor mount. I put it there and placed rcvr and esc as far forward as possible with battery at extreme LE of wing. It simply will not balance on cg at these dimensions. Any suggestions other than moving the wing back about an inch or so? Many thanks, Warren

    Warren Whittemore on June 7th, 2011
  • 17

    Sorry to seem to be so critical, it’s probly just me. I did put in a wood spar, about 1/8 x 5/16 oak actually. Drilled ends for a nylon line which seemed to work fine. I did move the wing back to get balance on cg. Test flew today but too breezy. I actually got a motor which weighs the same but I believe has lower kv rating. 3″ prop not big enough, put on 5x 3.8? climbs great! can’t wait to try on a calm day!
    Thanks for the easy, fun design!!
    WW

    Warren Whittemore on June 16th, 2011
  • 18

    No problem. Apologies for late replies…been kinda crazy with work lately…need more time flying :) .
    Glad it worked out. Enjoy! Send me some pics.
    -PG

    TheHobbyGuy on June 17th, 2011

 

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