About this Plan
Arbalète. Simple all-sheet catapult glider model.
Quote: "IN 1951 THE Swiss Federal Aircraft Factory at Emmen turned out this novel four-jet flying wing fighter and named it appropriately the N-20 'Crossbow' (Arbalete). It was to be a 6/10 scale model for a national defence interceptor, the [EFW N-20 Aiguillon] 'Stinger'; but after tests the project was dropped.
For years the appealing shape of the aircraft has attracted passers by at Emmen - and few knew the purpose or destiny of the aircraft. Whatever happens to it, we've taken it up as a most suitable subject for a catapult launched glider that can be made in a trice and will give hours of amusement.
Make the wing flat if you want a high speed long distance flier, or follow our recommendation and use the curved airfoil for some fascinating glides. Shape the fuselage from 3/16 sheet balsa, and the nose plates from thin ply, otherwise the 'Crossbow' is all 1/16 sheet. All components are shown prior to assembly over at top left. Shape them join the wing sheets and slide into fuselage slot. Use plenty of cement, and apply four smears as shown to obtain tip reflex. Sandpaper smooth, give two coats of sealer then colour dope.
With the reflex wing, and Plasticine ballast to obtain balance on the nose, 'Crossbow' needs a high speed horizontal launch with a 6 to 10 inch loop of 1 inch flat rubber for best flights. She zooms high and soars wide, yet after the fast climb, the speed diminishes as she circles for the landing. It's an object lesson in elementary flying wing trim to make a second model with the wing section flat.
Try this one! It may look very simple - almost to the extent of there being 'nothing in it'; but it can give the builder a handsome surprise - and we expect to hear of some thermalised losses!"
Supplementary file notes
Planfile includes article text.
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
Scale Glider F/F Military Fighter
all formers complete :)
got article :)
Found online 26/09/2012 at:
Format: • PDFbitmap
EFW_N-20 | help
see Wikipedia | search Outerzone
ScaleType: This (oz3416) 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/EFW_N-20
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 email@example.com
User commentsThis is my all-time favourite chuck glider. When I first made it, I couldn't afford to buy 1/16 and 3/16 sheet so I adapted the design by laminating the fuselage from 3 sheets of 1/16, and the fin was part of the central sheet. The central sheet has the grain running vertical. A very strong plane, as we often played in the street and it landed on the tarmac!
Bob - 24/06/2014
Added the missing link to Algy's raw scan post, thanks to Gregg.
SteveWMD - 23/11/2018
This flies splendidly with a pusher capacitor powered motor/propeller. See: https://jetex.org/index.php/jetex-forum?view=topic&catid=5&id=366
Roger Simmonds - 13/09/2021
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, 2011-2021.
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.