Electric Decathlon (oz6741)

 

Electric Decathlon (oz6741) by Floyd Manly from RCMplans 1990 - plan thumbnail

About this Plan

Electric Decathlon. Sport scale model, for Astro 40 geared Cobalt electric motor.

Quote: "This electric Decathlon will turn in the full aerobatic routine that Duane Cole's did. By Floyd Manly.

My introduction into electric flight was about 10 years ago when I did a product review for a magazine on one of the then available kits. To say that I was not impressed is a gross understatement. It was a toy, like a Cracker Jacks prize, in the sense that a grown man was embarrassed to admit that he played with it. I tried to write glowingly about something that I was eager to get rid of, and failed miserably. The review was never printed.

That was almost 10 years ago, and I harbored these impressions about electric flight until I happened to see a Graupner UHU performing at a fun-fly. The very next week, I saw a Great Planes Electro-Streak being put through its paces! Wow, these were electric birds that FLEW - with capital letters! Not just floating around like overstuffed sea gulls, but flying like hungry eagles. I had to buy one of each. That started the old juices flowing again. The enthusiasm was back, and I was having fun again. After all, the real secret to staying young is being too busy to think about it.

I first heard the axiom 'The man who dies with the most toys, wins' from Dave Platt. You know him. He's one of our leading R/C Scale builders, and a kit manufacturer, who also 'plays' with rubber power free flight aircraft, because they're fun! It's important that this hobby be fun! A magazine editor recently told me that model aircraft once got to be a drag for him. He cured his doldrums by starting on a model that was so completely different than anything he'd ever worked on that he had to learn a whole library of new stuff, just to get current on the latest technology. He found he was having fun again.

Electric power is doing that for me. I pulled all my old issues of R/C magazines, and re-read again everything I could find on EP. I wrote to almost every supplier and manufacturer to request information. It was when I began looking for available models to build, that the fog started to lift, and I saw that there just wasn't really that much to be had. Sure, a couple of floaters and trainers are here, but nobody had much of a selection of hairy chested aircraft.

It was at a full size air show on the 4th of July that world famous acrobatic performer, and entertainer, Duane Cole, put in a dazzling performance with his full size Decathlon. The decision was made, right there and then in the hot Arkansas sun, to have a Decathlon, and to make it Electric. Not the floating 05 size (as they call them) but a full throated Astro 40 geared Cobalt!

More research and a couple phone calls to the Guru of electric flight, Bob Boucher at Astro Flight, led to the size and weight design parameters of the Decathlon-E. Existing fuel powered versions of this aircraft were just too heavy, and slightly smaller than what I calculated necessary for optimum performance, so sketches were made of the outline and major structural components, and work was started. The vital statistics worked out as follows: Wingspan is 73 in, with a chord of 11 in. Ready to fly weight scaled in at 7 lbs 4 oz, so we came up with a wing loading of 20.83 oz/sq ft. Not too bad! It should be light enough to stay up with less than full power, yet be heavy enough for penetration into aerobatics.

Construction. Wing/Stab: Your job will be much easier if you take the time now to make yourself a rib template. Cutting one from thin aluminum, if you have any, is best. If not, make the template from 1/8 plywood. After sanding it to the final shape, coat its edges with CA glue. The CA hardens the wood so your knife won't shave off slivers as you cut each rib. Other modelers may be able to stack 15-25 ribs and cut them altogether on a band saw, but I've never had any success with this method. I've always finished up with some weird tapered shapes. I cut each rib separately, then I stack them for sanding down to final shape..."

Hi Steve - Here is Floyd Manly's Electric Decathlon from RCM magazine issue 05-90.

Direct submission to Outerzone.

Supplementary file notes

Article pages, text and pics.

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

Electric Decathlon (oz6741) by Floyd Manly from RCMplans 1990 - model pic

Datafile:
  • (oz6741)
    Electric Decathlon
    by Floyd Manly
    from RCMplans (ref:1067)
    May 1990 
    72in span
    Scale IC R/C Cabin Civil
    all formers complete :)
    got article :)
  • Submitted: 22/06/2015
    Filesize: 1073KB
    Format: • PDFbitmap
    Credit*: theshadow

ScaleType:
  • American_Champion_Decathlon | help
    see Wikipedia | search Outerzone


    ScaleType: This (oz6741) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.

    If we got this right, you now have a couple of direct links (above) to 1. see the Wikipedia page, and 2. search Oz for more plans of this type. If we didn't, then see below.


    Notes:
    ScaleType is formed from the last part of the Wikipedia page address, which here is https://en.wikipedia.org/wiki/American_Champion_Decathlon
    Wikipedia page addresses may well change over time.
    For more obscure types, there currently will be no Wiki page found. We tag these cases as ScaleType = NotFound. These will change over time.
    Corrections? Use the correction form to tell us the new/better ScaleType link we should be using. Thanks.

Electric Decathlon (oz6741) by Floyd Manly from RCMplans 1990 - 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):
  • Electric Decathlon (oz6741)
  • Plan File Filesize: 1073KB Filename: Electric_Decathlon_RCM-1067_oz6741.pdf
  • Supplement Filesize: 2002KB Filename: Electric_Decathlon_RCM-1067_oz6741_article.pdf
  • help with downloads
 

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, 2011-2019.

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.