Agujon V (oz7488)
About this Plan
Agujon V. Radio control sport pattern plane.
Quote: "From Costa Rica, comes this .35 to .50 cu in sport / pattern design. This presentation of model five has all the good flying characteristics the designer was looking for - try it and we feel you'll like it also. Agujon by Ricardo Saprissa R.
The idea for Agujon started out as a result of a rather spectacular crash while flying a Top Flite Nobler (oz525) at a control line exhibition a few years back.
Luck came into the act as I noticed that the wing, stabilizer, and elevators of the ex-Nobler were whole and almost intact between a pile of splinters and pieces from the fuselage. Of course, the entire incident was blamed on the gusty wind prevailing at the time of the exhibition, making it especially difficult to exhibit the flying of control line models. The fact that there was little wind apparent was not commented upon.
That did it! A more streamlined model was needed for wind penetration in this windy mountain valley of ours. So, to avoid as much frontal area as possible and achieve a penetrating profile, a very slim fuselage had to be designed; hence, the name Aggjon, meaning 'big needle' (from 'aguja'; Eng. - needle), to be fitted to the Nobler's leftovers.
This time, however, the new model was not to be limited to the flying space of 60 foot lines but instead was to carry a four function radio in its belly. This way the basic outline of the model was laid down and the construction was designed around the spinner, engine, radio and gas tank so that these components would fit with absolutely no space wasted around them; a snug fit!
Thus, the cross section of the fuselage was kept at an absolute minimum, the thrust line as near as possible to the wing chord centerline, and all settings at zero degrees. Directly to the firewall would be bolted a modified Veco .50 with a Kavan carburetor, swinging a Tornado three bladed 10 x 6 prop on a Veco needle nose spinner, and drawing fuel from a Sullivan SS-8 tank. The landing gear was of the conventional type anchored to the wing, plus wheel covers. The canopy was homemade from 1/16 acrylic and located on the fuselage as far forward as practical. This was Agujon I. Just so as not to deviate from the racy looks of the CL designs of the time, the vertical fin and rudder design was borrowed from Yuri Sirotkin's Spacehound (oz1826) CL stunter, FAI World Champion of 1964.
Flying the Agujon was sheer delight from the very start. It had characteristics of its own that nobody here had seen before. For instance, flared for landing on high idle would touch down tail wheel first and gradually lower the mains for a straight landing run before taxiing to the pit. This was called a 'one point landing!'
Naturally, all things change with time and the Agujon was no exception. However, now in its fifth modification, main changes are mostly structural excepting the cabin and the vertical fin and rudder, and of course, the wing. Now, Agujon V with a strong wing (although thinner) with a hot Schnuerle ported .40 with a tuned pipe, and an all-up weight of not more than 5 pounds, will perform incredibly even to the experienced flier. Try it.
Construction of the Agujon should not be difficult as it is designed for conventional and fast building methods. Strange as it may seem, the design was executed expressly behind the 2 in diameter needle nose spinner for looks, as this is what represents the needle principle of the design. If you are not able to procure a needle nose spinner right away, any other spinner will do as it will only alter the looks but not the flying.
As with most construction projects of this type, it is most practical to start by studying the plans thoroughly, continuing by listing the materials required and acquiring them. Carefully select all the accessories..."
Hi Mary/Steve - Here is Ricardo Saprissa's Agujon V from RCM magazine issue 05-86.
Direct submission to Outerzone.
Supplementary file notes
Article pages, text and pics.
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, 2011-2020.
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.