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Thread: MJ 9 or 3/4 ME109

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    MJ 9 or 3/4 ME109

    I've gone back and forth as to start a construction log here or not. Here goes, I hope I can keep up with the progress on a regular basis. The fuselage formers are made out of ash or plywood depending on the station number. This is a project I acquired several years ago with plans that where incomplete.

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    Fuselage full size plans page

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    Tracing the plans page to make templates. The formers are overlapping so the page can't be cut.

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    Re: MJ 9 or 3/4 ME109

    One of the two completed templates I've finished. They are made from 1/4 plywood from hd. I use spray adhesive from the hobby store. I spray the wood not paper to avoid the paper stretching. I noticed the stretching when I was making templates for my Dr1 wing ribs.


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    Re: MJ 9 or 3/4 ME109

    With the completed templates I can do a former in about 25 minutes. It takes me about an hour to make one template. About 15 minutes is in tracing the pattern. My plan is to make templates of most of the parts even some of the ones that only have one piece. That way in the future if someone else decides to build an MJ9 they will be available. The build time will be cut at least 1/3. How nice would it be to spend a week cutting parts and have all the fuselage formers and wing ribs parts cut ready for assembly. Here's one of the templates with the cut and finished former.

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    Re: MJ 9 or 3/4 ME109

    The original plans were modified in 2001. The mod made significant changes to the landing, wing, elevator, and fuselage. Since I'm working on the fuselage I thought I would put up some pictures to show a couple of the changes. The new plans have an option for an engine weighing over 200kg. Both upper and lower longerons were significantly reenforced. Also the firewall former was shortened to allow a box construction that the landing gear is attached too. This is a major change as it was attached to the wing spar prior.
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    Original fuselage showing firewall with the longerons exposed.

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    Good comparison of the old fuselage former and both the upper and lower longerons to the new firewall former showing the size of the new longerons.

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    This shows the shortened firewall former to allow for the construction of the landing gear support box.

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    Re: MJ 9 or 3/4 ME109

    Cutting the straps for the engine mount. Inside is 1/8" and the outside is 1/4". All 8 pieces were cut at the same time. Next is cut to length and shape the front.

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    Re: MJ 9 or 3/4 ME109

    Started work on the rudder fin. Had to cut the board twice first time I cut it to wide. Suppose to 122 mm wide, I cut it 144mm, when I went to do the bottom radius it didn't work.

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    Finding center line, using framing square to get two center points.

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    Bottom radius added.

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    Re: MJ 9 or 3/4 ME109

    Radius is cut and finished. Drilled the hole for the radius at the center of the cut from the top to the bottom to lighten the spar. Ran into a small problem, the dimensions are for the "k" and I'm building an "e". The "k" tapers from 43mm to 12 mm over a distance of 853 mm. The distance for the "e" is 610mm using the same taper. Mathematically not a problem but I'm worried the it will be to wide at the tip. The measurements are just for the cut, not the spar.
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