Sukhoi Su-26 (oz12645)

 

Sukhoi Su-26 (oz12645) by Richard Schneider 1988 - plan thumbnail

About this Plan

Sukhoi Su-26. Profile stunt control line model.

Quote: "Sukhoi Su-26, by Richard Schneider. Here's an interesting profile control line model that has taken two firsts in competition. Designed for .35 power.

The SU-26 is a Russian aerobatic airplane, one they have been using the last several years with some degree of success in competition. It uses a radial engine of about 360 horsepower, has a wingspan of about 25 feet, and I understand it uses some composite (foam and plywood) as well as more conventional construction techniques. And, as is true of most full-scale aerobatic airplanes, it looks like a big model.

Any airplane that looks like a model, and especially one that has a neat color scheme, should be made into a model. Anyway, I thought so, and since my main interest is in control line scale, why not build a stunt lookalike of the SU-26? If you don't follow that line of reasoning, let me explain: Over the last great number of years I've had the privilege of being friends with Tom Dixon, who is somewhat famous in control line stunt circles. As I've mentioned before, my interests lie along scale lines, while Tom's obviously tend towards precision aerobatics. This slight diversity of interests, together with our common interests in the grand sport of control line building and flying led to a probably ill-advised challenge being issued by one of us to the other, to wit: If you'll build a stunt airplane, I'll build a scale model. So here's my stunt model, and that's how it came about.

For those of you who are looking for the ultimate easy-to-build, high-tech stunt model from a world-famous designer/flier, you may have to look just a little bit further. This airplane is pretty basic with regards to design and construction. As far as any rela-tionship to a world-famous designer/flier, the model design was influenced very heavily by Tom's suggestions and edicts, and it borrows liberally from some basic parameters already set down by some existing good-flying profile stunt models. (That means the moments and areas are basically those of a Twister.) Anyway, since I'm not qualified to comment intelligently on the stuntability of the model, I ll leave that part to Tom, assuming he'll admit to any involvement with it after all of this.

FLYING BY TOM: As Dick has written, this model arose out of a friendly bet, sort of. He's winning so far, as a new house and our rambunctious 2-1/2 year old have put a severe dent in the building schedule. But just you wait - there will be a Dixon scale project, and it will loop and fly inverted just like 'real' airplanes. None of this wallow around the sky stuff; no sirree!

As for the subject here, it works! I flew the second-ever flight on the model and put it through the pattern despite the aged, ailing Fox on the nose. (A new piston/liner will fix that.) Total trim changes I advised were (1) move front leadout back a half inch, (2) de-crease tip weight by a quarter ounce, and (3) install a pushrod brace on rear pushrod. That's it. These changes are shown on the plan.

The model is definitely a cut above the average profile. Part of this is attributable to Dick's light, straight construction. The remainder of the credit goes to his design. The wing is quite special, as it increases in airfoil thickness percentage towards the tips. This makes it easy to build on a flat board, but also greatly decreases wobbling in tight square corners. The sheeted leading edge, common on full-bore stunters but not profiles, also does its bit for airfoil efficiency. If you don't like the SU-26 fuselage, no sweat; build whatever you like around this wing, moments and areas and you'll have a profile that could make the top 20 at the mats. More than anything else, the plane feels like a good Gieseke Nobler (oz10588).

Don't alter the control hookup! This is part of what makes it so smooth. If you build heavy, consider a .40 engine for power. The wing can carry extra weight, but power will be needed to do it. The modified Fox .40V, O.S. and Magnum 4OGP in stunt configuration would be good. The HP 40, properly reworked, is excellent too, but no longer sold in the US. Other good engines would be the Merco .35 and Old Series O.S. 35 stunt.

Playing with this thing has got me thinking. Let's see, if you take a Rabe Bearcat and the outlines of the SU-26, and ...

If anyone is still with us, let's get down to:

CONSTRUCTION: This model is pretty simple and straight forward. I did make a conscious effort to keep the weight down as best I could, given the volume of that big slab of fuselage. (I considered making a built-up profile fuselage - I've done it before - but good sense and laziness prevailed.) To this end, the model uses contest-weight balsa from Lone Star for all of the balsa parts. That stuff is really nice to work with. I recommend you also use contest-weight wood (from whatever source).

For adhesive, I stuck (no pun intended) with 30-minute epoxy and CA. I used the epoxy where a large area was involved - fuselage doublers, wing mounting, bell-crank mounting plates, etc., and CA everywhere else. Keep all the joints neat and tight and the thin CA works fine.

A good way to proceed with the construction is to make a kit; cut out all the major pieces so you'll have a collection of airplane parts in front of you all the time. This makes it apparent that there is always something ready to glue to something else..."

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Sukhoi Su-26 (oz12645) by Richard Schneider 1988 - model pic

Datafile:
  • (oz12645)
    Sukhoi Su-26
    by Richard Schneider
    from Model Builder
    June 1988 
    48in span
    Scale IC C/L Civil
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 27/10/2020
    Filesize: 387KB
    Format: • PDFbitmap
    Credit*: MB2020
    Downloads: 668

ScaleType:
  • Sukhoi_Su-26 | help
    see Wikipedia | search Outerzone
    ------------
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    ScaleType: This (oz12645) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.

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