Clod Nine (oz12261)


Clod Nine (oz12261) by Dave Thornburg from RCMplans 1972 - plan thumbnail

About this Plan

Clod Nine. Radio control slope glider model. A five-dollar sailplane for single or small 2-channel.

Quote: "Steve, Please find attached the plan for the Clod Nine glider a simple all sheet glider. This was published I believe in ...the 70’s (I don’t have the magazine anymore). All I have is the reduced plan published in the magazine, it wasn’t available as a full size plan. I scaled it up to the 72 inch size on the plan. I believe the designer was Dave Thornburg."

Direct submission to Outerzone.

Note this plan is, it turns out, from RCM, Jan 1972. It appeared as part of the article "Slope Soaring in Colorado's High Country" by Dave Thornburg.

Update 13/06/2020: Added article, thanks to RFJ, Mary.

Quote: "Soaring the Rockies! The idea was born during a midnight bull session in miserable windy January: a five-day trip through Colorado that would combine slope soaring, fishing, camp-ing, and motorcycling. The crew was to consist of veteran Albuquerque slope soarer Don Spellum, the club's junior expert, Steve Work, my wife Jan, and myself.

Wheels-up date was set for Saturday, June 19, and everyone scheduled their vacations accordingly. With six months to design and build in, we planned to take along three of the snazziest knock-apart sailplanes in the country. Then, suddenly, June 12 arrived and all three were still in the design stage. At the last minute Don adapted folding Jedelsky-type sheet wings to one of his old standbys, a six-foot vee-tail along Standard Austria lines.

Steve stayed up till 5 am the night before to stick together a sturdy all-balsa original with Jedelskys and a knock-off nose. (All noses, Don keeps pointing out, are knock-off.)

I hastily threw together the 'Clod Nine,' an all-balsa pod and boom design with those ubiquitous Jedelsky wings and one of the ugliest rudders ever attached to a sailplane.

We quickly stuffed these three beauties into Sig Foam Wing boxes, strapped them to the bikes, and rolled out on schedule Saturday morning..."

Supplementary file notes



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

Clod Nine (oz12261) by Dave Thornburg from RCMplans 1972 - model pic

  • (oz12261)
    Clod Nine
    by Dave Thornburg
    from RCMplans
    January 1972 
    72in span
    Glider R/C
    formers unchecked
    got article :)
  • Submitted: 24/05/2020
    Filesize: 221KB
    Format: • PDFbitmap
    Credit*: HarryKirkland

Clod Nine (oz12261) by Dave Thornburg from RCMplans 1972 - pic 003.jpg
Clod Nine (oz12261) by Dave Thornburg from RCMplans 1972 - pic 004.jpg

Do you have a photo you'd like to submit for this page? Then email

User comments

Clod Nine, the Old Buzzard's sense of humour at work again. And this time he went tight-fisted or minimalist or both, Heck, even the plan is minimalist! I didn't know of this one and I was a bit surprised, but if the benchmark was a 6-ft model for $5 then he won a bet. I liked that big note on top saying 'Celastic or Solarfilm on wing will *double* performance". I imagine he meant 'halve construction time' as the usual sandpapering, pore-filler plus a couple of dope coats with more sanding in between plus appropriate curing times are eternity compared to ironing thermoplastic. All in all a fun, time and cost effective model, and I suppose the important word would be "fun"!
Miguel - 13/06/2020
Add a comment



Download File(s):


* 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.


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, 2011-2020.

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.