Edgar Percival E.P.9 (oz2313)
About this Plan
Edgar Percival EP.9 Cropduster. 43.75in span FF scale. For .5-.8 power. Aeromodeller March 1959. Scale is 1/12.
Quote: "As soon as George Woolls saw the E.P.9 'Aircraft Described' feature in our January 1958 issue, he realised that the cropsprayer was a perfect subject for a free-flight model. Proportions looked so right that no deviation from scale appeared necessary and the bright colouring of the Skyspread version was most attractive. Yet the thought of hours of work painting the inscription on tissues which can so easily be torn, did not have much appeal, something more durable in covering was needed.
Many years ago it was commonplace to make model aeroplanes from cartridge paper, and the use of this material seemed to be the answer. Besides being a good medium on which to paint, the lack of sag between ribs provides a good simulation of the stressed skin of the original aircraft. A test wing soon showed that there was no undue cause for concern on the weight factor and the final pair of wings complete with Ornamentation weighed only 2-1/2 oz. Cartridge paper was also used to cover the fuselage sides between the pod and stabiliser where they carry the inscription.
Another problem was the undercarriage, the wing strut passes very close behind the undercarriage oleo leg, the fairring of which has a cut-out to clear the strut. Any form of backward springing seemed to carry the penalty of knocking the wing struts out of position. After much thought a simple system incorporating a rubber sprung 'oleo' was used, which not only results in a very fair representaiton of the original undercarriage but seems to work well when the model lands.
A simple form of stretching wing strut was developed enabling a scale dihedral on the ground to increase to a safe flying dihedral in the air, where the deviation from scale is not so apparent.
Constructionally the model is orthodox except perhaps for the wings, so a few extra words of description of their construction may not go amiss..."
Update 24/09/2017: Added PDFvector plan tracing, thanks to hogal.
Update 29/10/2020: Added a 2-colour vector BW version of the plan file, thanks to Miguel.
Supplementary file notes
Planfile includes article.
Vector PDF BW print file.
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
Edgar Percival E.P.9
by George Woolls
Scale IC F/F Cabin Civil
all formers complete :)
got article :)
Found online 24/01/2012 at:
Format: • PDFbitmap • PDFvector
Credit*: aeromeddeler, hogal, Miguel
Edgar_Percival_E.P.9 | help
see Wikipedia | search Outerzone
ScaleType: This (oz2313) 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/Edgar_Percival_E.P.9
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, 2011-2021.
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.