About this Plan
Viking. Free flight old-timer model, for electric power.
Also kitted by Astro Flight.
The original Cleveland Viking design had 48 in span and was a FF gas model. This here is a later version at 62 in span, for Astro 05 geared electric motor and 3 channel RC.
Quote: "Electric Cleveland Viking. In a double feature, Astro Flight's major domo comes up with a quite rare but also classic looking Old Timer and puts in electric power. You may want to 'convert' this one to gas power!
INTRODUCTION: I had been searching for a different old timer model for my Astro cobalt 05 geared motor. My Playboy flew great, but the pylon was a hassle to build and made installation of all that electricity difficult. I wanted a nice cabin job with a Playboy style wing. My search ended in Rider's Hobby Shop in Ann Arbor, Michigan.
Rider's had a cute little Cleveland Viking hanging from the ceiling. The Viking was designed at a 48-inch span, so I had Bob Sliff and John Lupperger blow up the Cleveland plans to 62 inches.
A few weeks later, the first Viking was finished and just in time for the Reno Nets. For passer I used the Astro geared cobalt 05 motor, a seven-cell Sanyo 800 MAH battery, the Astro electronic on-off motor control, and a Rev-Up 11 x 7 prop. My Monokoted model weighed 36 ounces, complete with Futaba radio.
I balanced the model on the spar and set the elevator throw to 15 degrees and the rudder throw to 30 degrees. The V-dihedral wing has about an 1/8 inch of tip wash-out for good luck.
The Viking flew beautifully right off the board. It is very stable and easy to fly, but still quite responsive to radio command. I was able to average over 10 minutes of glide time from a 1-1/2 minute motor run; more than enough to max. On many flights I got over 20 minutes. I packed up the Viking and headed for Reno.
The thin air at Reno was a problem. The prop just did not bite enough air to get a really good climb. I borrowed a 12 x 8 Top Flite prop, and it worked much better, but still more prop was needed for best results. Bob Slilf had a 16 x 8 Zinger which he cut to a 12-inch diameter to fit the SAM rules. His Cobalt 05 Playboy beat me by 30 seconds, so I had to be satisfied with second place. Just wait till next year!
It's unfortunate that the author of the SAM rules was not concerned with altitude when he formulated the 12-inch prop rule. This rule needs changing..."
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Supplementary file notes
Article, thanks to theshadow.
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User commentsHi Steve and Mary, As a kid in the early 1960s radio control was out of reach so most of us flew control line and free flight. Free flight teaches you a LOT about aerodynamics. So fast forward to the late 1980s when RC gear was becoming reasonably priced and I wanted to get back into the hobby. Knowing I wanted a slow flying (ie. plenty of time to react) stable (ie. self-correcting) RC plane, the answer was obvious... a big free flight with RC assist. Hence the Astro Viking was my first RC plane. After the maiden flight I pulled out the disappointing electric motor and NiCads and installed an Enya .099 and yes it flew quite well on such a meager engine. Upgrading to an Enya .19 really did the trick though, permitting a reasonable range of aerobatics.
Fast forward again to 2021 and a friend from my old flying club back in Canada sends me an old stock new in box Astro Viking kit, saying, "Hey, wasn't this your first plane?" So of course I had to build it, but this time with a modern electric propulsion system using an 1100 Kv motor and 3S LiPo battery. So here's the result of the second time around 35 years later [main pic, 004-011].
I would advise anyone building one of these from the plans to lengthen the nose at least an inch because I've had to add a lot of extra weight in the nose to get the CG anywhere close to optimum. Cheers,
Steve C - 07/01/2022
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