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40% Ka-3 part scratch part kit

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  • Gene, I'm still following with great interest!

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    • Gene C
      Gene C commented
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      Thanks gunny 11, I'm afraid this build is taking longer than the 1/3 scale N72DG Cherokee II build.

  • Took some time off from the Ka-3 build to attend the Hood River Glider Weekend. The (WAAAM) Western Antique Aeroplane & Automobile Museum was incredible and should not be passed up if in the area. It was the shot in the arm needed to re-energize the Ka-3 build.
    Attention was placed on sheeting the stabilizers ‘D’ section before attempting the wing leading edge ‘D’ Section. The process will be the same but the stabs are much shorter in length. Half the process is now complete with the upper surface sheeting to be ironed down in a day or two after the glue between the sheeting and spruce leading edge is full dry.

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    • Finished sheeting the upper stab surfaces and did a little epoxy work.

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      • The dilemma was to fit the V tail stabs to a non covered fabric covered fuselage profile. With the use of some low tech tools and a piece of 1/64th plywood an imaginary fabric covering was fitted. It was then just a matter of fitting, scribing, sanding, fitting, scribing, sanding and so on for a half hour or so for each side. The outcome is very close with the final fitting to be after the fuselage is covered and before the stabs are finished. My hope is to have a clean gap edge between the stab and fabric covering that a piece of paper can just pass thru. Time will till.

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        • Worked on a capstan drum drive for the aileron control today. The reasoning is that the 2 1/2” between the holes on the aileron horns can’t be duplicated inside the wing. Fitting a standard servo arm for the KM1203MD servo would be too small with not enough travel. The 0.886 dia of the drum should provide approx 1.2” of equal travel from the drum in either direction. The 0.032 dia steel cable will wrap 3/4 of a turn in both directions from the locking point inside the front recess and exiting on the center line of the drum. This also lines up with the scale wing slot openings in relation to the control horn. Robert small threaded clevises and 2-56 all thread rod will make up the cable end connections. At least that's the plan.

          Addendum: Further testing with the transmitter and ruler showed a total travel in one direction of 0.50". When placed with the aileron horn movement the aileron deflection is 1.375 at the trailing edge in pencil tearms. The aileron chord is 4.25 lending to plenty of control.
          Last edited by Gene C; 11-01-2018, 04:28 PM.

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          • Assembled the aileron servo boxes and and test fit the assemblies in position within the wing. Just to make sure the servo and drum would all fit thru the scale inspection hatch opening the test hatch opening was taped in position and given a try. The servo and drum dropped in without any problems although at an angle due to being a rather tight. The aileron servo boxes are now glued in place and curing nicely in the shop.

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            • ARUP
              ARUP commented
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              Neat solution! We must be mad (crazy) to do all of this! lol

            • Gene C
              Gene C commented
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              A little insanity does help on occasion, so your correct in saying we must be mad to do all this. My fear is, it's going to get worse before the end of this build.

          • Cut free and hinged the ailerons but took a little time to verify the aileron drive concept before proceeding on to the facing stage.

            https://youtu.be/YhECQxGV9K4

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            • Fantastic stuff. A club member uses this technique in his 1/3 scale WWI plane. Click image for larger version

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              Last edited by gunny11; 11-09-2018, 05:17 AM.

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              • Faced and radius the aileron leading edges. The 1/16th dia Stainless steel hinge pin is guided to each hinge pilot by way of a plastic tube resting in a routed channel on the back side of the aileron facing.

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                • Very nice Gene....keep 'em coming!

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                  • Progress if only slight. Glued the 3/32 square bass wood cap strips in place on the ailerons. Located the full scale print in the shop and detailed the aileron to match. Sanding will be next before the wing aileron skirting can be fixed to the wing. Also after sanding the control horns can be epoxy in place and the upper cover glued on.

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                    • Gene, it's another awesome piece of work! Looking forward to seeing it fly in the spring!

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                      • ARUP
                        ARUP commented
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                        +1 I've said it before and I'll say it again because I don't have much imagination... what a cool sailplane!
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