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Scale RCM 1/3 Scale Champ Build

Discussion in 'Giant / Scale Scratch and Kit Build Threads' started by TonyHallo, Jan 5, 2019.

  1. TonyHallo

    TonyHallo 70cc twin V2

    Once the left aileron was mounted I noticed that the ribs did not align with the wing ribs, I was considering starting over. I had already laid out the fuselage plans on the bench and was making up a material list for the rest of the build. I also found the book by Paul Matt and purchased it for reference. The there view shows the aileron ribs are angled rather than straight as show on the plans. More reason to start over. IMG_2280.JPG
    dhal22, Jetpainter and acerc like this.
  2. TonyHallo

    TonyHallo 70cc twin V2

    Here is the three view. I verified the angled aileron ribs on Airliners.net. IMG_2281.JPG
    acerc likes this.
  3. TonyHallo

    TonyHallo 70cc twin V2

    A different approach was used to build the right aileron. A spine was made from 1/8" lit ply and lighted with 2" holes. This removed almost half the weight. The 1/4" dowel trailing was glued on. The bottom side received 1/16" plywood to simulate the ribs while the top side were made from 1/4" balsa. I'm pleased with result and the redesigned aileron only weights 1 gram more than the original. I also noticed the ribs for the stab do not match the three view. I plan to use the same approach when building the stab. IMG_2279.JPG IMG_2283.JPG
    Last edited: Jan 27, 2019
    Alky6, Snoopy1, Jetpainter and 4 others like this.
  4. TonyHallo

    TonyHallo 70cc twin V2

    Today the spruce for the fuselage and stab along with the 4130 steel tubing for the landing gear was ordered from from Aircraft Spruce. There are 7 different sizes of spruce needed, hope none were missed. Started making parts for the landing gear.

    Snoopy1, dhal22, Jetpainter and 2 others like this.
  5. TonyHallo

    TonyHallo 70cc twin V2

    Also looking at engine choices, thinking a Roto 85 FS. Would really like the 4 cylinder but don't think it will fit inside the cowl.
  6. dhal22

    dhal22 GSN Sponsor Tier 1

    I'm curious about Roto's. Much cheaper than Valachs and Kolms. But you get what you pay for.
  7. Beautiful workmanship Tony.
  8. TonyHallo

    TonyHallo 70cc twin V2

    The Valach and Roto 85 are not much different in price, maybe $200, the Kolms are much larger displacement. I have no idea what the actual cost is since you are responsible for the tariff tax. I seen the Roto 170 on Ebay for $2400 but in the fine print it stated you are responsible for the import tax, this was coming from Poland. Might be 25%, don't know?
    dhal22 likes this.
  9. TonyHallo

    TonyHallo 70cc twin V2

    Thanks Randy, can't wait until it warms up for good. The Indiana Flyer Club is having a fun fly on June 22, hope you can join us.
  10. TonyHallo

    TonyHallo 70cc twin V2

    3/4 of tubing arrived yesterday from Georgia, the last piece of 5/8" tube is due on Tuesday from California. The 1/2" tubes are cut to length and one of the lower forks is made and pinned to 1/2" tube. The upper trunnion will get silver solder to the outer 5/8" tube, it is drilled and tapped for 4-40. To assemble the strut, the lower fork is removed, spring inserted into outer tube, then 1/2" inner tube, a 4-40 control rod with a stop silver soldered is insert through the 1/2" tube and tighten. The fork is held in place with a 1/8" split pin.
    Different springs were found at an old time hardware store, they do match the drawing better. Their selection was much better than the local Ace. It will be sad when all the old time hardware stores are gone. Need to come up with a way to bend the 3/8" x .065 tube for the trailing rods. Not sure if heat will be used or not.
    Alky6, Jetpainter, WMcNabb and 2 others like this.

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