About this Plan
Achilles. Contest-winning free flight power model from Yugoslavia. For 2.5cc power.
Quote: "TOP place as land or seaplane in the Yugoslavian National contests, and a three year record of continuous high placings, forms the contest back-ground to this outstanding design. Emil Fresi is now internationally renowned as a regular representative of his country in Wakefield and Power finals, and needs no introduction for the contest-minded reader. He adheres to the power design formula originated by American Leon Shulman, whose Banshee (oz1192) and Zoomer (oz1636) achieved fame in the '46-'49 seasons, and in Achilles, Emil adds the many detail improvements we have come to expect from his ingenious countrymen.
High wing and tail angles, with built-in pylon fuselage and single wheel undercarriage give it the Shulman stamp. Gone is the symmetrical tailplane, and in its place, an anhedralled tail with novel dethermalising tip arrangement allows safe trim and gives better performance. Gone is the extreme dihedral, and added is the drag tab for glide turn. These, and many another structural feature, go to make Achilles one of the neatest FAI power designs it has been our pleasure to witness, and we venture to suggest that its reputation for 'in the groove' power flight pattern will make it extremely popular with all power fans.
Construction is robust and practical - the fuselage being built on the crutch system, with F2 and F3 installed first, then the wing platform, the spine, and the diagonals. This can be completed over the crutch plan on the building board, with the front portion overhanging the edge. Planking, underside stringers and formers, engine, timer and tank installation follow, then the fin is added, with ply bracing plates at the, leading edge joint. Tail and wing structure are conventional, except that the spars are assembled first and each panel built in turn over the plan. All ribs are cap stripped top and bottom, and the tail must be built upside down because of its anhedral.
Initial glide tests with the CG at 56% Chord and rudder 3° to the left, should produce a shallow descent with very slight left turn. Try, an 8 seconds power run at half revs, and check the power turn which should be to the right rather than left..."
Update 24/06/2016: article page, text & pics added, thanks to RFJ.
Update 20/02/2019: Replaced this plan with a clearer copy (patterned background removed) thanks to TonyP.
Direct submission to Outerzone.
Supplementary file notes
Previous scan version.
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
by Emil Fresl
IC F/F Pylon
all formers complete :)
got article :)
Found online 16/11/2011 at:
Format: • PDFbitmap
Credit*: algy2, TonyP
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, 2011-2022.
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.