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IAD

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Posts posted by IAD

  1. I find this discussion surprising, since I've got a -19 that I've transformed quite a few times (15-20 times, I'd guess) with no stress marks whatsoever... Tiny bit of paint wear on that tab, of course, but no stress.

    It's a first-run unit, I got it a few days after the official release.

    I have sanded down the pegs a bit, but only because I was scaring myself, with the amount of force I had to use. (After building featherweight balsa RC aircraft for years, using pounds of force on a model/toy was a terrifying experience.)

    ~Luke

  2. Wow.... Neat. Overall.

    I will note that the LEX/nose strakes don't sit down into the intake boxes enough, giving the fighter mode the broken back look... And the intakes seem a bit large. (Or the fuselage/nose seems a bit small?) Perhaps a measure to minimize the scare-crow look?

    Still, a very impressive design.

    ~Luke

  3. Nothing that I know of... Maybe I wasn't true enough to the line-art? :blink:;)

    Sean, here are the latest pictures... One of the now-finished control system, and one showing the deflections with the stick all the way to the left. Somehow, I think it will roll. :D

    ~Luke

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  4. Well, the flight control system is mechanically interlinked so all the control surfaces respond cooperatively to my control inputs. (All off two servos, too!) So, at least the pilot workload is pretty low.

    Unfortunately, production of the SV is pretty much off the table, due to copyright issues. A couple one-offs (sort of an oxymoron, isn't it?) is one thing, but I imagine there'd be trouble if I did a production run of the things.

    ~Luke

  5. Those flight videos on Google are great. During the "Sorta Cobra"... looks like you had zero forward airspeed and still maintained altitude.

    That is a great looking aircraft both in the air and on the ground.

    Is it possible to make a vacuum form mold from your hand carved master? It may allow partial mass production since you have already validated the design.

    Yep, I was pretty much sitting there, driving the nose with the thrust vector. Not bad, considering the tiny 7 oz. of thrust, or whatever it is...

    The problem with vacuum-forming is... What do I form? Styrene sheet (0.02") would produce an airframe that weighs 11 oz. which is 5 oz. overweight. (The entire aircraft, loaded, is supposed to weigh 12 oz..) I've tried vacuum-forming foam sheet before... Don't talk to me about that! :blink: (It was rather traumatic, in the magnitude of failure. :rolleyes: ) I even tried matched-mold compression molding of the foam. Very touchy business.

    Now, I am working on a 'secret project' which (if it works) could change my model-producing landscape forever, but that's for another day.

    Sean: GAH! $600, for shipping!? :blink: *Passes out*

    ~Luke

  6. Another update, added the tipfins, and what-not.

    Working on a gunpod, as well... Not sure if it's flightworthy, I'll probably attach it with magnets. First I need to make it fit the magazine, apparently my version has some a non-lineart-accurate set of cross-sections between the nacelles.

    Lastly, Sean: Take a look, I threw together a mockup of the gunpod magazine with detailing. If you like it, I'll go and make a cleaner version, if you don't, I've got a blank ready to be installed.

    ~Luke

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  7. Sean, I'm working on the gunpod mag. right now (saving 0.1 oz., in the process) and I'm wondering: Would you like me to engrave those little quadrilateral-shaped panels into the upper surface? I tested it on a spare piece I had, and it looks really good, but perhaps it's too much surface detail, given the rest of the aircraft is un-paneled? (I'm short a camera at the moment, but I'll post a pic. or two in a couple hours.)

    Also, should I install the raised hexagonal panels on the nose, or do just supply you with the CAD patterns?

    ~Luke

  8. Well, charging right along here... Look at the deflections the updated thrust-vector paddle design can achieve!

    I've more than doubled the throws compared to my ship. The new linkages are also more reliable, making it almost impossible for them to disengage in flight, something that occured on mine a couple times. (They were a bit tricky to make, though... Nothing like tying knots in 1/64" thick wire. :blink: )

    Anyway, I'm planning on finishing the airframe by tonight. We'll see. :rolleyes:

    By the way, Jwinges: I take it back, a 12" 3D airframe carved out of foam wouldn't be too bad, weight-wise, according to some volume calcs. I did in CAD. Still a bit of a pain to do, of course.

    ~Luke

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  9. Thanks guys! I ordered an SV-51 model kit, and went for SAL shipping. (Just couldn't justify doubling the order cost, just for quicker shipping.)

    I saw the estimated times, but "7-45 days" is sort of broad. I'm not in any hurry, but I do like to know about how long I have to wait. ;)

    ~Luke

  10. I'll see if I can dig up the plans for the profile ships. Pretty much, they're just traces of top/side views of the designs, though.

    I'm using Dow's pink insulation foam; I initially block-cut the components using a hot-wire bow, and then just start shaping with sandpaper, keeping a careful eye on sectional symmetry.

    Because of the volume of the airframe, I wouldn't count on a 12" span version to be light enough to really fly well. (It would also be quite a pain to carve, at that size.)

    I can't think of any off-the-shelf airframes that are close enough to the SV to really convert convincingly. With a lot of work, an Su-27 might pass, but you may as well just build the whole thing from scratch. (You'd need new LEXs, wings, stabilizers, nacelles, canopy, plus the canards. That's almost the entire plane.) Same goes for the YF-21.

    ~Luke

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