Not A Scratchbuild – MultiPlex DogFighter

These are some shots of the Multiplex Dogfighter Kit.

Overall the build is simple, but I have to say I don’t care for building a store bought plane. Following someone elses vision is rather boring overall, and I found myself not putting the effort into the kit I should.

Oh Well, motor, that I thought was a true outrunner, did not have the top mount capability. When I glanced at it, I mistook the prop mount adaptor holes for a true outrunner. Rather than wait for the correct motor, I mounted a 1100 36series to the external face. Of course, this is a 5 mm shaft, which means the spinner that comes with the kit cant be used, and the motor sits outside the fuse, detracting from the look.

Was surprised to see screws with a Standard screwdriver head, what the heck, that’s a PIA! Did not care for the motor mount design, nor the thin foam at face of fuse. CG was achieved with battery very far forward, but not an issue at all. Gluing in the spars was annoying as hell.

So, with all that, I still like the look of the plane, and if it flies as good as the one I flew this morn, it will be time well spent!

Gluing the fuse together:2016-05-28 14.14.33

Motor Time:
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Basic Shots:
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Mini Gremlin #2

Since both the full size and mini Gremlins fly like a dream, I could not leave well enough alone and decided to build a very slightly different one.

For this one, I increased the wing span to 34″, and used symmetrical airfoils from the corsair build, hot cutting them to have a slight upturn at the TE of the outside airfoil.  Supposedly this helps a wing design offset the natural tendency to track downward….
This slight upturn is only 1/2″ and is difficult to see from the photos, but does give the span of the wing a slightly different angle tip to tip.

And of course, speed is always an issue! The earlier mini gremlin uses a 1400kv motor, and while quite respectable, I’m curious what kind of control I would have with a faster gremlin.
So, this build has a 2200kv motor, swinging a 7×5 prop…..

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LAR Mini Gremlin

Looking at planks, I came across a site about the Combat Gremlin, and it offshoot, the Mini Gremlin. Its a site that sells a kit that has a foam core wing and plywood fuse.

Since its a retail item, there are no plans, and the most I could find was that it was 30″ wingspan.

Here is my Looks About Right (LAR) version of the plank. Symmetrical hot cut foam wing covered in wing tape, 1400 kv motor turning an 8×6 prop. I find the design strange, in that the fuse sits in a cutout you create it the wing, but the motor thrust line is above the wing. Before adding the rudder wings, I was tempted to built it upside down from  the original design!

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LAR Twin Bruiser

I have many motors from the quad days, and decided to build something to see if I can make use of some of them. To start, I have used the original DJI 950kv motors that were used from 8″ to 10″ 2016-05-07 20.02.01 2016-05-10 19.25.38 2016-05-10 19.25.50 2016-05-10 19.26.07Started with a hot cut wing, 48″ in length, but only a cord of 8″.

Noticed the ft cruiser is close to what I want for body and wing look, so borrowing heavily from that design.

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LAR Plank

Continuing with the flat plank style, here is a design with a fully symmetrical airfoil, and the LE cut at each corner to prevent tip stall.

Apparently the winglets are not required with the this cut, however, decided to play it safe.

Running an 1100kv motor and an 11″ prop, this design flies like a dream.

*Update – got caught in some wind, drove the plank into a building… this is No More!


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Corsair Profile

The gull wing design is interesting, but I have no clue as to what advantage it is supposed to provide…

That said, thought why not scratch build one!. Here  is a 46″ wing, built a jig to cut the angles with a hot wire, using the LAR principle, so don’t know what the actually degrees are.

Since this was a build that came together with no real thought, the awful paint job is appropriate.

Powered by a Park 450, a 9×6 prop and a 40a esc, the maiden should be interesting…..

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