Mini Smog Hog (oz8067)


Mini Smog Hog (oz8067) by Keith Donaldson 1973 - plan thumbnail

About this Plan

Mini Smog Hog. Radio control sport trainer model. A 3/4 size version of Howard Bonner's original 1956 Nationals-winning Smog Hog (oz671) design.

Quote: "Famous old plane, Nats winner too, has to come to life again - but this time in miniaturized form (not that small: 3/4 size, which puts it into the size most of us are seeking these days.) If you haven't yet gone the Mini path, we can recommend this scaled-down version of an old bird. Mini Smog Hog, by Keith Donaldson.

If you happen to save all your modeling magazines (as most of us do), and happen to live in New Jersey (as some of us do), you might (as we do) while away the long, miserable New Jersey winter evenings alternately thumbing through old issues of Model Airplane News and building airplanes to crash next summer.

If you got as far as the November 1956 issue, you would learn in Ed Lorenz's Radio Control News column that 1st place in R/C Multi at the 1956 Nats was taken by Howard Bonner and his Smog Hog (oz671). A little farther down in the stack is the February 1957 issue, which featured a construction article for the Smog Hog. For 50c you could have gotten the full size plans drawn by Cal Smith, with plans for two Ukies to boot. MAN no longer has these available - too bad! - but Chuck Gill has one pasted on the ceiling of his shop, if you find yourself in that neighborhood.

If you keep reading through the stack, you will discover that the Smog Hog won the '57 Nats, too, when Bob Dunham built ailerons into his version. Dunham also won the '58 and '59 Nats with his Astro Hog (oz4756) - nothing but a Smog Hog cleverly disguised by moving the wing to the bottom of the fuselage.

If you persevere (the effort now assumes the status of 'research'), you will turn up Hogs with an astounding variety of radio equipment and motors, together with all the 'improvements' made to Bonner's original design. You are also left with the impression that about one out of every four R/C flyers in the country during the late 50's and early 60's was doing it with a Smog Hog.

Bonner's original Hog weighed in at a dainty 5-1/4 pounds, pretty light for better than 860 square inches of wing, and a Fox .35 proved more than adequate for the task. Most copies turned out somewhat heavier than that, and consequently required a bit more muscle to haul them arou'nd. This was especially true if you were fortunate (?) enough to own 10-channel reeds, complete with five working servos, to drop down into the Hog's innards. If you weren't so affluent (some of us weren't), and went the VariCamp route, you saved a good bit of weight but perhaps had certain other problems. Some of the more popular variants included ailerons and/or trike gear, but most versions were built to the original specifications - standard tail-dragger with rudder, elevator and throttle controls.

The Mini Smog Hog is a three-quarter size copy of the original. I had intended to build it full-size, being inspired by Bob Peru's Hog chugging around majestically with an Enya 60 - but nobody knew where I could find all that wood locally, and I didn't know how I could afford it if I did find it! However, some easy arithmetic; showed that at three-quarter scale, one could be built without using all the balsa in Monmouth County - it would still be a reasonably good-size plane, capable of flying comfortably with a .20 to .30; it would probably be able to perform a few modest aerobatics, yet it should have a bit of inherent stability, helpful to those of us who still occasionally crash and burn.

Having gotten that far, the only way out was to build the darn thing, so I did. It didn't fly right off the proverbial board - as a matter of fact, it was pretty miserable until trimmed out, but after that it was very nice. One of our older club members, who remembers the good old days, wondered why I hadn't built it with ailerons so as to be able to do Cuban Eights, like Bob Dunham.

Well, one thing led to another, and pretty soon I found myself turning out another one, complete with ailerons and trike gear. The trike gear certainly makes takeoffs easier, and roll maneu-vers are somewhat more axial with the ailerons, but aside from that, there's no essential difference between the two. The first one weighs just over 3-3/4 lbs ready to fly, and the second, with the trike gear and extra servo, is a bit under 4-1/4 lbs. With a muffled Max .30 for power, neither one can quite make Mach 1, but they both eventually get where they're going. So, if you're ready for something a few steps beyond a Delta Dart, but you're not quite ready for an Eyeball and the FAI Pattern, I think the Mini Smog Hog is the one for you.

Construction: Construction of the Mini Smog Hog is quite straightforward (honest!) and follows conventional practices which in this case doesn't simply mean that that's the way I build 'em. The fuselage, for instance, is the well-proven, often used, and not very pretty BOX. Since you will need it in hand when it comes time to glue the fin and stab to something, you might as well begin here..."

Mary, Attached full size plan and article for Mini Smog Hog by Keith Donaldson from August 1973 MAN. Plan was cleaned and enlarged by Circlip.

Direct submission to Outerzone.

Supplementary file notes

Article pages, text and pics.


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Mini Smog Hog (oz8067) by Keith Donaldson 1973 - model pic

  • (oz8067)
    Mini Smog Hog
    by Keith Donaldson
    from Model Airplane News
    August 1973 
    56in span
    IC R/C Cabin
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 23/09/2016
    Filesize: 418KB
    Format: • PDFbitmap
    Credit*: RFJ, Circlip
    Downloads: 1154

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