Shadow (oz14483)

 

Shadow (oz14483) by Van Hereford 1992 - plan thumbnail

About this Plan

Shadow. Radio control duration model. Wingspan 57-1/4 in, wing area 356 sq in. For Cox Texaco .049 engine.

Quote: "RC Duration. A new way to fly.

In the 1988 AMA rulebook, a new and previously unknown way to fly models in competition was given form and substance as Provisional Event No702. The new event's name is RC Duration, or RCD, and the latest rules appear on the last page of the 1990/91 rulebook. Actually, the concept wasn't completely unknown. Many modelers will remember competing in 'Renaud Memorial' contests, and RCD is very similar.

All planes must be radio controlled and powered by a Cox .049 cu. in. reed valve engine with the standard 8cc tank. The only limit on engine run time is the fuel supply, and the maximum time per flight is 15 minutes. This arrangement will also sound familiar to SAM enthusiasts, as the power format is identical to their 1/2A Texaco rules, except for their seven-inch limit on propeller diameter.

Since the RCD concept has been developed with the so-called 'Sport Flier' in mind, aircraft specifications are simple and straightforward. Wingspan is limited to 60 inches, and the planes must weigh at least eight ounces per square foot of wing area. These specifications were adopted to limit the need for special materials and building techniques to be competitive, and to allow a wide variety of existing glider kits to qualify with very simple modifications. The minimum weight rule should result in stronger models using traditional materials and will eliminate the need for special lightweight radio systems. A standard two-channel radio is all that's needed for RC Duration flying.

Fuel economy, not brute power, is the key to success in duration events where engine runs are limited by a fuel allotment. Almost any 1-1/2 meter hand launched glider kit will work for RC Duration flying. Gnomes, Wristocrats, Cox Silhouettes, Flippers, Ace Hi's, Kastaways, Tercels and many others have been successfully converted by simply sawing off the nose, gluing on a 3/16-inch plywood firewall and mounting the engine with sheet metal screws.

Experimentation has shown that a wide variety of airframe shapes and sizes can provide good results, but the optimum wing area for RCD models will be in the 275 to 350 sq. in range. At 300 squares, the required weight is about 17 ounces, which is a good load for reed valve engines. Larger and heavier models can be flown, but will require higher rpm and therefore yield shorter engine runs; and a long run under power is one of the keys to success.

After a reasonable break-in period, the Cox Texaco .049 with a 7x6 prop will run dependably at 6000 rpm for about five minutes. That combination of power and run time will take a fairly clean, 18 ounce model as high as hawk meat. Black Widows and Golden Bees can be adjusted to match this performance but can also be cranky and inconsistent at reduced rpm... "

Direct submission to Outerzone.

Scan by MarkD, cleanup by Circlip.

Supplementary file notes

Article.

Corrections?

Did we get something wrong with these details about this plan (especially the datafile)? That happens sometimes. You can help us fix it.
Add a correction

Shadow (oz14483) by Van Hereford 1992 - model pic

Datafile:
  • (oz14483)
    Shadow
    by Van Hereford
    from Model Builder
    August 1992 
    57in span
    IC R/C
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 14/03/2023
    Filesize: 430KB
    Format: • PDFbitmap
    Credit*: MarkD, Circlip
    Downloads: 316

Shadow (oz14483) by Van Hereford 1992 - pic 003.jpg
003.jpg

Do you have a photo you'd like to submit for this page? Then email admin@outerzone.co.uk

User comments

No comments yet for this plan. Got something to say about this one?
Add a comment

 

 
 

Download File(s):
 

Notes

* Credit field

The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.

Scaling

This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.

 

Terms of Use

© Outerzone, 2011-2024.

All content is free to download for personal use.

For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.

Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.