Gnome 2M (oz6872)

 

Gnome 2M - plan thumbnail image

About this Plan

Gnome 2M. Radio control sailplane. Wingspan 77-1/2 in, 628 sq in area, for 2 channel R/C. For slope or thermal, suitable for hi-start or winch.

Quote: "Enlarged from the Midway Models 60 in hand launch Gnome (oz6773) which proved so successful, this 2-meter version has proven itself also. Gnome 2M by John Lupperger.

Unlike many designers who go on about the many years they have put into their masterpiece of design, my Gnome 2M is really only an 'up-growth' of my R/C HLG (that's hand launch glider) the Gnome.

The Gnome came about from an idea I had for an R/C hand launch contest which was sponsored by the Inland Soaring Society (Riverside, California). In that case, all models were restricted to a maximum span of 60 in, and the Gnome was designed to both fit the size requirement and to look good doing it. Not only that, but it flew very well to boot. In fact, it flew so well, and received so many good comments, I decided to blow it up to 2-Meter size.

In the technical department, the Gnome 2M sports an Eppler 205 airfoil thickened to 12.5%. In practice, I have found that this gives it a much gentler stall than the stock 205. And since the thickened foil gives more lift, it allows the 2M to fly very slowly. On the other hand, it has better than normal penetration for a 12% foil and, when ballasted up, will give a good account of itself in a speed run. Furthermore, the thicker foil offers greater wing strength through the fact that the spars are farther separated from each other. Heavy duty hi-starts and winches are no problem, and moderate zoom launches will produce a good altitude gain.

The Gnome 2M offers generous tail volume and ample dihedral. These make her a very stable and easy to fly model. However, these same qualities that make it a good choice for the novice sailplaner, make it an excellent sailplane for the more experienced pilot. It thermals very well even in light lift, and if you are a sloper too, it is great fun there also. If you really like to have fun, put some extra throw in the control surfaces and it will do rolls and even spin.

It hasn't yet won the World Cup, but on its very first outing, it got me a second place in the Inland Soaring Society's monthly contest.

So, get out the plan, and build it. But, before you start, read through the instructions carefully, and be sure you understand all the steps.

Fuselage. With the plan on the building board and covered with wax paper, lay up the two fuselage sides..."

Direct submission to Outerzone.

Update 02/08/2018: Added PDFvector plan tracing and CAD files, thanks to AlanSinclair.

Supplementary file notes

Article pages, text and pics.
PDFvector plan tracing.

CAD file

This plan is available for download in CAD format.

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Gnome 2M - completed model photo

Datafile:
  • (oz6872)
    Gnome 2M
    by John Lupperger
    from RCMplans (ref:955)
    December 1985 
    78in span
    Tags: Glider R/C
    all formers complete :)
    got article :)
  • Submitted: 22/07/2015
    Filesize: 968KB
    Format: • PDFbitmap • PDFvector • CADfile
    Credit*: SteveBailey, AlanSinclair

003.jpg
003.jpg
004.jpg
004.jpg

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User comments

Dear Mary and Steve, Thank you once again for a great website. I have started working on a Gnome 2m, scratch build from the plans I have downloaded from your site. There is a slight mistake on the third sheet. The sheet with the templates. The template for the fuselage side is 10mm too narrow. The length is perfect. Refer attached photos [see morepics 003, 004]. The orange is the template I have highlighted on the edge. Thought I would just share this. Regards,
BertOosthuizen - 08/10/2016
Thanks Bert. Very useful to get feedback from model builders like this. Hope the rest of your build goes well.
SteveWMD - 08/10/2016
hi there I have a question. I'm starting this as my first build! :D. when starting with the fuselage it says: glue the 3/16 sq longerons to the bottom edge of the fuselage sides. what do they mean with the longerons? as I'm from the Netherlands its sometimes a bit hard to get it ;)
martin - 30/07/2019
Hi Martin, longerons are long structural members. Look at the pic with the yellow scissors, the two longerons in this view are above and below the orange highlights. Seen from ahead this fuselage has a rectangular section, the longerons are at the long square sticks at the 'corners' of the rectangle, running from nose to tail. I'd suggest you take a look at the RCLibrary site and download a couple of model construction books. And get on with it, you're on the good track :-)
Miguel Morao - 30/07/2019
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Download File(s):
  • Gnome 2M (oz6872)
  • Plan File Filesize: 968KB Filename: Gnome_2M_RCM-955_oz6872.pdf
  • Supplement Filesize: 1453KB Filename: Gnome_2M_RCM-955_oz6872_article.pdf
  • Supplement Filesize: 341KB Filename: Gnome_2M_RCM-955_oz6872_vector.pdf
  • CAD Zip Filesize: 394KB Filename: Gnome_2M_RCM-955_oz6872_CAD.zip
  • 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.

 

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