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Old 01-09-2013 | 06:26 AM
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doxilia
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Default RE: MK Skymaster

ORIGINAL: bem

Rune,

I would try with user flywilly since he wrote in another thread about Super Sicroly II I wrote that he had an almost complete collection of MK kits (except MK Super Sicroly II that he did not have - but I have).
Post #10 here: http://www.rcuniverse.com/forum/m_97..._1/key_/tm.htm

With some luck he may have the Skymaster 60 kit and drawing but remember that all MK drawings I know of do not contain compelet info such as wing and stab root+tip templates for example so best is to ask for them also (I usually just place such balsa templates like that in a scanner and do a scan and save as TIF/PDF). I suppose one can do a good guess of wing and stab root+tip templates shape but if one want to have it 100% accurate You need copy of that also from the kit.

/Bo
Bo,

indeed, Will might be the closest person to having the classic SM this side of the pond. I believe the Korean fellow ran a hobby shop reason for which he had all the Japanese kits that came out from the various designers. I recall seeing a snap of the plan at some point on his site.

I noticed from the pictures you posted that these earlier classic SM kits came with sheeted foam wings and judging from the kit breakdown contents, there was also a sheeted foam stab. Because of this, it wouldn't be possible for Will to scan root and tip rib airfoils unless he had the actual kit in which case he could produce the templates for cutting foam cores - that would be outstanding. Again from the pictures, it looks like the SM60 might have had an every so slightly airfoiled stab but I'm gauging this from the cutout in the wood filler blocks that go above the stab - the pictures of these parts are pretty small.

One key feature shown in the picture re-attached below is that it seems to indicate an airfoil change from root to tip going from 15% at the root (I assume) to 12% at the tip. While the airfoil templates are not strictly necessary since the plan usually shown a wing and stab airfoil, the percentage shift in the airfoil is necessary as the single section view on the plan wouldn't tell us this. Of course, this would be true for the stab as well but that information is not given.

In my experience from studying MK plans, they usually didn't alter the airfoil from root to tip other than in its thickness so if I were to reconstruct the SM60 from plans without wing and stab root and tip airfoils, I would take the section shown on the plan and produce a scaled version of it for both root and tip. Generally, this is how MK did things. It's also interesting that MK didn't really change his aerobatic airfoil from one model design to the next - they were all pretty much the same airfoil from 20 size models to 120 size. As far as I can tell, the MK SM20 has the same airfoil as the MK Super Chipmunk 120. Magic, Curare, Mattlas, Arrow, Skymaster, Blue Angel - all the same I believe. I haven't done an extensive study on it but that is my recollection. All the 120 size models (Chipmunk, Zlin, Akrobat, Laser 200) use the same foil too. It is very similar to the Quabeck aerobatic airfoil designed for gliders. I wonder where Kato sourced this foil in his early days...

It would be worth having the photos like the one below translated - probably just the typical marketing info but nonetheless.

David
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