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Old Feb 05, 2015, 07:16 PM
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1/6 scale Luton Minor

I'm not sure why, but I've always liked the Luton Minor. Back when I was about 14 years old or so (~42 years ago ) I obtained a 3-view drawing of the thing from Falconar Aircraft in Edmonton, Alberta. It's dated 7/27/61. I built a Peanut Scale model of it. I think I've got some pictures of the model around here somewhere...

Anyway, fast forward to today and I've started scaling off that same blueprint copy, working out the actual dimensions. The drawing says the scale is 1/40, but given the known wingspan of 25', it just doesn't make any sense. I'm guessing the "1/40" refers to some sort of metric stuff; furlongs or something like that . I'm not going to let that deter me!

In addition to working out some dimensions, I've made a steel template of the wing's airfoil:

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So here we go

This is going to be less involved that my recently completed Volksplane. Flat tail surfaces, no attempt to match an actual example, etc. , etc.

I've got an unused ASP .21 engine looking for something to do - should be perfect

More as things progress.
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Last edited by dgjessing; Feb 06, 2015 at 06:42 AM.
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Old Feb 05, 2015, 08:02 PM
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Cool project! I like these types. I received my full scale Pietenpol plans in the mail today!
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Old Feb 05, 2015, 08:28 PM
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Awesome story. I'll be watching the build.
It's always nice to have a childhood connection with your favorite planes.
That's what keeps me building.
Justin
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Old Feb 05, 2015, 10:46 PM
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"Cool project! I like these types. I received my full scale Pietenpol plans in the mail today! "

Model A engine, of course???

Les
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Old Feb 06, 2015, 07:35 AM
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The Model A engine would be way cool but don't know just yet.
dgjessing- did you see the 1/4 Luton Minor thread over at 'scale/scratch' in electric forums? What is the span of your 3-view... 7.5"?
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Old Feb 06, 2015, 12:37 PM
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Quote:
Originally Posted by ARUP View Post
dgjessing- did you see the 1/4 Luton Minor thread over at 'scale/scratch' in electric forums? What is the span of your 3-view... 7.5"?
Yes - 7.5". Off I go to look at the other thread...
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Old Feb 06, 2015, 05:47 PM
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Did a lot of drawing & head scratching today. The version I'm modeling (#L.A. 4A) turns out to be close to 44" long (with the 50" wing span) @1/6 scale. Not sure if it will fit in my car assembled . So I'm going to have to make the wing easily removable.

And I'm less and less confident that the .21 engine will be sufficient. I mean, I'm sure it would be OK in perfect weather, but I wonder if I'd have enough umph to handle a windy day...

As I said, I'm not planning on going overboard with scale detail on this one; I'm really after a fairly quick (and cheap) build here . With that in mind, I'm seriously considering a hot wire cut foam wing. Sure would be easier...

I dunno.
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Old Feb 07, 2015, 06:38 PM
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Just diving right in here, starting with the fuselage . The sides are 1/16" balsa:

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...with 3/16" sq longerons & vertical pieces aft:

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...and 1/16" sheet doublers from the rear of the cockpit forward:

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I've rejected the foam wing idea - it would be too heavy, and I think I've blown my extra weight allowance on the solid fuselage sides
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Old Feb 07, 2015, 06:41 PM
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You could put a couple of diagonals on the rear section then cut away the sheet so that the tail end stays lightweight. Glad you nixed the foam wing. Hard balsa spars w shear webs and 1/16" ribs will be fine.
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Old Feb 07, 2015, 08:01 PM
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Nuttin' like a cold steel rail to help keep thing straight.
I like ARUP's comment on the balsa wing instead of foam.
Justin
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Old Feb 08, 2015, 06:02 PM
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For this particular model* I'm skeptical about whether the (slight) weight saving gained by cutting holes is worth the effort. I thought about it - I could cut out about 54 sq in of 1/16 balsa from the aft fuselage sides. That would amount to about .3 oz of weight saving. Obviously, some strength would be lost, unless I added some diagonal bracing to make up for it. How much would the bracing and glue weigh?

Anyway, moot point . This afternoon I made up a central "core" of 1/8" plywood, comprising the servo tray and bulkheads on either end of the straight section of the fuselage:

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And then I glued the fuselage sides to the core on a nice flat surface:

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... and added a plywood plate for the landing gear to mount on, brought the aft ends together, and put in cross braces top & bottom:

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It's nice to have an assembly to look at


* This is sort of a quick & dirty build. Certainly, If the goal were a work of art, things would be different
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Old Feb 09, 2015, 04:19 PM
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More on the fuselage this afternoon. I worked out how I'm going to do the central wing struts (what do you call that structure?). Rather than doing round struts coming up through the turtle deck & cowl, I'm going to make 14 ga. aluminum struts about 3/8" wide, screwed onto the sides of the fuselage. Not scale, but a whole lot easier to do. I don't think it will detract too much appearance-wise So anyway, I put in plywood patches and 4/40 blind nuts for those and the lower end of the long wing struts:

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And the firewall:

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Old Feb 09, 2015, 07:04 PM
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Nice clean work! I like the little saw cuts made in longerons to ease the bend. The center struts are cabanes... is it to that which you referred?
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Old Feb 09, 2015, 08:17 PM
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Thanks!

Cabanes - that's it
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Old Feb 11, 2015, 06:48 PM
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Over the past couple days I've made up the landing gear:

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It's of 13 ga 6061 T6 aluminum from the scrap yard, with steel springs.

And this afternoon I put in the rudder and elevator push rod guide tubes:

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Once the glue is fully cured I'll sand the ends off flush with the fuselage sides.

And I've roughed in the top front of the fuselage:

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Lots of whittling and sanding yet to be done .

Here's the fuel tank just laying where it will eventually go:

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I'll need to make an access hatch under it. The Rx battery may go under the tank, depending on how the balance shapes up.
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