About this Plan
Proof. Radio control electric powered sport aerobatic model.
Quote: "THE INSPIRATION to design 'Proof' came when a member of my local club built a semi-aerobatic electric model from a kit. Although it flew reasonably well, nearly every landing caused something to bend or crack. It seemed to me that this was down to two things: it weighed too much and the flat-bottomed fuselage made the motor vulnerable to ground damage.
With these points in mind, I drew the plans for Proof, hoping for an all-up-weight of around 2-1/2 lb. The fuselage bottom was drawn curved with the lowest point falling below the Ni-Cad position to keep the motor shaft clear of the ground.
To keep weight to a minimum a fully built-up structure was used, with very little use of ply. The model really does not need 'beefing-up' as the prototype has had over 150 flights without any damage. Lazy builders - do not be put off by the built-up wing, it is an evening's work.
The name 'Proof' came about because I wanted to prove to my local club's members that you could have a great performing electrical model without the need for an expensive motor/battery combination.
Wing: Start the model by building the wing first as it is useful to have a finished wing when completing the fuselage construction. The wing is built using 36 in lengths of wood; one piece and no waste. I always cut a rib template from cardboard or plywood and use it to draw out all the balsa ribs. It is worth the effort as the ribs come out exactly the same size - at least they should.
Lay the plan on a flat board and give it a good waxing to prevent any glue from sticking to it. Pin the trailing edge stick in position, followed by the 1/4 square rear spar. Starting at the centre section, glue all ribs to the spar and traling edge. I use medium cyano throughout the construction. Once all ribs are in position, glue in the the upper spar, checking that it sits down correctly in the rib slots..."
Proof, RCM&E, June 1990.
Direct submission to Outerzone.
Supplementary file notes
Article pages, thanks to RFJ.
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
Do you have a photo you'd like to submit for this page? Then email email@example.com
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, 2011-2019.
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.