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Choco Fly SB 14 6m Build Thread

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  • #16



    Sorry for the delay in posting this – I had to have a herniated disc in my neck removed between C5 and C6 and a bone spacer graft and a titanium spacer installed. Finally feeling healed enough to write this, and starting to work on the SB14 again.

    So, on to installing the Torcman drive system. I've attached instructions from Torcman that explains the entire process at the bottom of this page. Before I started, I taped all of the openings in the motor and its' bearings over with blue tape, along with the front bearing on both sides to keep construction detritus. After the install was complete I used my dental picks to remove the blue tape from the front bearing. The motor mount ring I have is round and the SB14 fuse is somewhat oval, so I made a cresent-shaped filler out of plywood and glued/screwed/laminated it to the top/front of the motor mount ring. I used carbon powder in the resin used with the fiberglass cloth so it would match the carbon used in the mount ring.

    I used my Robart incidence meter to align my fuse on the bench with the wing at +3 degrees. I taped a spirit bubble to a 3/16 square piece of spruce and taped it to the motor. I lightly clamped the motor shaft to my workbench and then used a shim to make the spirit bubble parallel to the shaft since the motor housing is slightly bell shaped and adjusted the mounts for it to be level. Now, the motor will have 3 degrees of downthrust with the fuse at 0 degrees. The motor mount ring got tacked in with a few drops of 15 minute epoxy, then the front bearing was also tacked in. Then the motor was carefully removed and thickened West Systems epoxy was filleted in on both mounts front and rear. During this phase the motor shaft was also cut to length.

    From Florian Schambeck is a really nice tow release. This all aluminum jewel is a low profile unit that also serves as a servo mount. Schambeck recommends a KST DS125MG servo – I didn't have one on hand and substituted a KST X10 mini. I mounted it as far forward as I could while making sure it cleared the motor. I transferred the tow release opening from the release using a piece of blue tape. I pressed it around the opening, then cut out the material using an Xacto knife. Using a flashlight, I transferred the opening location from the inside to the outside by shining a light thru the fuse and put a dot on the outside of the fuse where the opening needed to be. On this model the fuse seam is on the centerline of the fuse making it easier to center and locate.






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    Comment


    • Steve P
      Steve P commented
      Editing a comment
      Lookin’ good! Glad you’re feeling better and back on the build. Thanks for the Valenta build “helpline” call earlier today. I was stumped. I’d give you five stars on a customer survey.
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