Saab J21 (oz12018)
About this Plan
Saab J21. Radio control stand-off scale model of the Swedish twin-boom pusher-engined fighter. For .35 - .60 engines.
Scan from dfritzke, cleanup by Circlip.
Direct submission to Outerzone.
Update 18/03/2020: Added article, thanks to Pit.
Quote: "This WWII Swedish fighter adds a refreshing twist to military Stand-Off Scale. Saab J21-A, by Fred Angel.
Maybe those tall, leggy, blonde Swedes in Playboy got to me. Maybe it was because I really couldn't pronounce that name with my New England twang. Maybe it was the raised eyebrows and the cynical sneers when I suggested the project to my flying buddies. Whatever the reasons. I just had to build that Saab. The three-views of this unusual fighter kept flashing through my mind.
Finally , after weeks of muttering words like 'pusher' and 'twin booms
' and 'I wonder if ...' my kids dragged me to the workshop and barred the door with: Now, build the thing!
As I started to layout the aircraft. it became obvious why it had so much appeal. Man, it had class. Take a pusher-fighter with rakish lines, a generous wing and tail area, a trike gear and twin booms. Add clean scale details and a simple color scheme, and you have a stand-off ship that is sure to give you a chance at any contest. Or, if you're not ready for the contest scene just yet, make a low flying pass at the local field and then brace yourself for those long, leggy, sweet things high-stepping out of those racy sports cars.
The remarkable thing about this model was that, ready to fly, the weight was only four and one-half pounds! Test flights convinced me that a slightly smaller version would fly equally well on less power. Consequently, the plans offer an option of wing sizes and power choices. The larger version flew cleanly with an Enya 45 and a Tornado 10 x 6 pusher prop. The smaller version, which was thrown together in a hurry with no attempt at beauty, did just as well on a 35 and a Grish three-blade pusher.
OK, let's build. Carefully select your balsa for building and try to keep the tail light. To achieve the correct balance, it was necessary to fly with the landing light batteries and three ounces of weight in the nose. Don't worry about adding weight, the large wing area can take it. Get a copy of Profile Publications No.138 for reference. With that tacked up on the wall, the plans laid out in front of you, and a peanut butter and jelly sandwich at your elbow, you're all set to start with the fuselage.
Cut out a matching pair of 1/8 medium-hard balsa splines as shown on the top view, and cut out all formers. Also cut the top and bottom keels from 1/16 plywood. Mark the former positions on the keels, splines, and the maple motor mounts. Mix up a batch of epoxy, and glue formers F-3 through F-6 to the motor mounts. This will give you a crutch on which to support the splines and top keel.
After the epoxy sets up, white glue the splines and the top keel. Then add formers F-1, F-2, and the bottom keel. When everything is dry, you can plank or sheet the framework. If you are adept at planking, do it! I've found that it is just as easy to sheet compound curves using the following technique.
Select a 'bendable' sheet of 3/32 balsa, spray with hot water, and glue to formers F-1, 2, and 3, and along the side splines. Note that the glue joint on F-1 stops just under the side canopy. Hold in place with masking tape and pins. Now cut a 'V' in the top of the sheet from F-3 to F-5, and start shaping the sheet down to the curve of the formers with your fingers. By cutting and fitting, you'll be able to form the sheeting into a neat curve.
When satisfied with the fit, coat the formers with glue and tape the sheet to them. Don't worry about any gaps where the sheeting meets. This can be filled in as described later..."
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
SAAB_21 | help
see Wikipedia | search Outerzone
ScaleType: This (oz12018) 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.
ScaleType is formed from the last part of the Wikipedia page address, which here is https://en.wikipedia.org/wiki/SAAB_21
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.
Do you have a photo you'd like to submit for this page? Then email firstname.lastname@example.org
User commentsNo comments yet for this plan. Got something to say about this one?
Add a comment
* 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.
© 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.