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Nice. Thank you.
The choice to put four in the pod or two in the pod and two in the wing is for simplicity of build. Most four in the pod setups I've seen are fine, but for a new scratch builder can be daunting. Putting the servos in the wing is very simple and straight forward, with little chance of making a big mistake. As you have probably seen elsewhere, my current project does not have servos in the wing. Thanks for the upload. That drawing should fill a few gaps for people. |
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First vertical tail
The first rudder is out of the mold.
Too heavy and not a beauty, but everything went fine While is was working on the molds, something came to my attention. As usual too late to be considered, therefore the first set of molds might be scrap. Due to the fact that the rudder has a non-symmetrical profile, shouldn't it be mounted with some angle of attack to the right (0.4 - 0.6°) to compensate the uplift force during normal flight? My current design has a straight mount |
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The difference between one mounted axially and one with the "normal" offset is very tiny in the air. You may lose a small fraction on launch but it will trim more consistently across speed ranges.
Fly it. Good work btw. I always struggle to make my tails light enough when integrating a boom mount. You have to make a lot of them to get that process down. |
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Long way to go.
I'm working slowly from the back to the front. Tails are ready now. Next will be a mold for the horizontal mount. In parallel I'm working on the first wing. The fuselage seems to be the most complicated thing. As I want to build with 4 servos in the fuse, the existing drawing seems to be too small. Hence, I have to modify/redraw it and I'm not sure yet if I'll try to mill the mold directly (would be limited to the two piece design, due to my small CNC mill) or make a positive (which could include the boom and printed in pieces) and make a "classic" mold (something I've never done so far)... The good thing is that I have my new AURI to survive, the bad thing is the weather in Germany. |
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Hi Tom,
that would be great and would save time. As the vertical seems to fit, I've just uploaded the related files to the Teams folder. |
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The first wing panel is done
Untrimmed at 66.4g, a little bit on the heavy end. Many little things to be optimized... Not really beautiful. I haven't put too much effort in the painting, it was intended to be a test run for the wax-paint-epoxy combination. My spray can paint tend to creep under the masking film, but maybe I just didn't wait long enough for the full dry-out of the wax @Tom: Have you had any chance to check for the "roomy" fuselage? I'm really struggling with designing my own in Rhino (and running out of time for the trial period) |
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Just back from vacation. Try this one... it is designed for 4 in the pod electric and has a flatter profile (not drooped nose) but the incidence is the same as others.
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Yeah, perfectly in time, just 3 days left for trial period and currently no budget for a license.
I'll stretch nose part before the wing by 20 - 40 mm to make it a glider fuselage. The first usable wing panel is just ready. Thanks! |
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Just in time with the expiration of the trial license I was able to modify the E-fuselage. It's stretched by ~45mm and has now a canopy at the top.
It was much faster and easier than starting from scratch. A Rhino license is now on top of my need-to-have list. I've attached the modified Rhino file, an IGES and a split three piece STL version, suitable for e.g. an Elegoo Mars resin printer. Fuselage is printing at the moment and my plan is to fill it up with Epoxy and glass bubbles, sand, filler, paint it with PUR 2-component topcoat and build a "classic" mold. My CNC mill is slightly to small to make the mold |
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Thanks, but I'm not planning to print the mold.
Just a positive as basis for a mold made from epoxy and glass. I printed a mold from Elegoo ABS like resin for the horizontal stabilizer pylon and the edges already chipped after three parts. I don't think that a printed mold for the fuse would last long and it would require a massive amount of resin and splitting into parts. The canopy mold is waiting to be printed. I assume that this could last long, as it is just a curved surface. I would have liked to mill the mold. I do have Ureol available, but the fuse has 411mm an my mill has a maximum of 420mm. Therefore no margin to finish the faces. |
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Check out the Scratchbuilt DLG thread, bracesport is doing some very neat things with printed molds/plugs/mandrels.
Starting roughly here, AFAIK: https://www.rcgroups.com/forums/show...postcount=1075 Re CNC milling a mold, you can mill half of the mold, then slide the stock and reclamp, then mill the other half, yes? |
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Quote:
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