Katana plans? - RC Groups
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Aug 14, 2008, 03:22 AM
A.K.A sir Crashalot
methuso's Avatar

Katana plans?

I am thinking of building my first large plane out of foam and I really like the looks of the Katana.
Anyone have some free plans for it ?
(I want a full fuse)

Otherwise nyone have any thoughts on it if i make the plans from a 3view? like what airfoil to use?

Im thinking of enlarging it to 100"+

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Aug 14, 2008, 12:43 PM
Registered User
I got one but not full fuse, you may need it for reference anyway.

15% symmetrical airfoil will be fine for most of 3D planes.

If you trying to build a 100" planes with foamies, i don't think it's a good idea, frames of foamy plane goes unstabilized with the size over 1500CM ( i didn't mean you cann't, but with all supports, it's more heavier than a ply plane)
Aug 14, 2008, 12:45 PM
RJPIoW's Avatar
I have a plan that's almost complete for a 25% Katana - 1942.5mm wingspan. It has NACA 0014 root and 0016 tip wing section.

However, Ive almost completed the build of a 2nd trial Depron model working up to this big one - testing build componets and ideas, hence the pause in finishing the Katana plan.

Its a 59" span Extra 300S. Uses a lightened foam core wing and a 6mm Depron fusalage. AUW 38 oz, 5 sq feet of wing, wing loading 12 oz/sqft. I went for the foam core wing for speed of build, I have a depron skinned built up wing design as well - uses rolled 6mm depron skin over depron formers.

Powered by a Turginy TR 35-48-A 1100kv brushless that gives
81oz thrust from a APC 12x6 off 42 Amps from a 3cell or
13x6.5 giving 91 ozs from 53 Amps.

Should be 3D capable ! Hope to maiden it next weekend as there is still a bit to complete. That plan could be available quite quickly.

Aug 14, 2008, 02:22 PM
A.K.A sir Crashalot
methuso's Avatar
thanks guys. This is very good info.
I was eyeing 3D Foamies plans a cpl of weeks ago. I might use them as a 3view.

As for the rigity i am planing to use ordinary white housebuilding foam and Maybe dress it in oracover.
So formers might be 3+cm thick and the skin 1-2cm thick, made up by several layers of 3-5mm foam slices.
If this is not firm enough theres always packing paper that goes on good with diluted woodglue
Not the lightest but UH has big motors too
I choose this because a ARTF would cost about 1200$ here in sweden.
I'll spend the money on United Hobbies instead
Another reason is that i saw this 2.7m foam yak from Mr Claes Meijer.
Look uner videos at http://www7.hemsida.net/meijermodels/indexx.htm

Another thought would be to enlage the Micropitts plans by 760% which would make a span of around 240cm. Thats BIG for a bipe.
Last edited by methuso; Aug 14, 2008 at 02:29 PM.
Aug 14, 2008, 08:30 PM
Sam Adams Fan
DG40's Avatar
An old thread on this subject.

I put these old plans into cad last fall if your interested.
Hope it helps
Aug 15, 2008, 12:39 AM
A.K.A sir Crashalot
methuso's Avatar
Thank You very much. adding an airfoil to that wing cant be hard