North American A3J-1 Vigilante (oz6042)

 

North American A3J-1 Vigilante (oz6042) by Mark Frankel from RCMplans 1983 - plan thumbnail

About this Plan

A3J-1 Vigilante. Sport scale twin ducted fan model. 66-1/4in span, 1126 sq. in area, for (2x) 7.5cc engines and 5 channel RC. Model: pl-902. Designed by Mark Frankel. Featured in RCM 12-83.

Quote: "An exciting design done in 1-1/4 scale for two ducted fan units.

In August of 1958, when jet technology was rapidly advancing, the Columbus Division of North American Aviation flew a prototype aircraft so sophisticated that 25 years later many of its features were just being assimilated into the current generation of fighters and bombers. The A3J Vigilante was conceived as a supersonic bomber with aircraft carrier capability. It was powered by two General Electric J79 dash 2 engines and possessed very exotic aerodynamic features. For instance, roll control was provided by a complex series of spoilers and deflectors on the wings coupled with differential stabilators instead conventional ailerons. The limited lift provided by extremely thin wings was augmented at low speeds by leading edge flaps and boundary layer control which was bled from the high pressure section of the J79 compressors. Weapon delivery was accomplished by ejecting a bomb rearward through a tunnel located between the engines.

The A3J evolved into the RA-5C during the mid-1960s and served in an active reconnaissance role until the late 1970s. While the RA-5C has a certain resemblance to the early A3J, its appearance is distinguished by a deeper fuselage profile, increased air inlets and larger wing area.

I chose the A3J as a scale ducted fan subject because of its dramatic appearance and the feasibility of modeling it in a simple balsa structure. Since I was unsure of whether a twin engined jet of this size would fly, I wanted to avoid the effort and expense of making a fiberglass structure.

While the Vigilante offers simple lines that can be modeled easily with conventional balsa techniques, there are several problems that prevent it from being a serious AMA scale subject. First, the complexity of the full size control system would be difficult, if not impossible, to model. The wing thickness had to be increased for structural reasons, and the main landing placement and retraction sequence is slightly incorrect. These deviations from true scale limit the model to a stand-off or sport scale role.

While the airframe is traditional balsa for the most part, there is also some fiberglass molding. The air inlet ducts describe a very shallow S-curve and their cross section changes from rectangular at the entrance to circular at the fan face. This shape can only be achieved in fiberglass. Therefore, before starting the Vigilante, the builder should feel confident with fiberglass lay-up techniques. Furthermore, vacuum forming is used to mold the canopies, and foam core cutting is required on the flying surfaces.

In terms of flying ability, the Vigilante should be preceded by some jet experience with models such as the Jet Hangar or Byron series of ducted fan fighters. Twin engine experience is not essential since the Vigilante's centerline thrust is identical to flying a single engined model.

There are several materials called for on the plans that are not available through normal hobby channels. These include low viscosity epoxy and cloth for the fiberglass lay-ups, and polyeurethane foam for the canopy plugs..."

Direct submission to Outerzone.

Supplementary file notes

Article pages, text and pics, thanks to RalphG.

Corrections?

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

North American A3J-1 Vigilante (oz6042) by Mark Frankel from RCMplans 1983 - model pic

Datafile:
  • (oz6042)
    North American A3J-1 Vigilante
    by Mark Frankel
    from RCMplans (ref:902)
    December 1983 
    66in span
    IC R/C
    all formers complete :)
    got article :)
  • Submitted: 14/10/2014
    Filesize: 2666KB
    Format: • PDFbitmap
    Credit*: PatrickUrbain

Do you have a photo you'd like to submit for this page? Then email admin@outerzone.co.uk

User comments

No comments yet for this plan. Got something to say about this one?
Add a comment

 

 
 

Download File(s):
  • North American A3J-1 Vigilante (oz6042)
  • Plan File Filesize: 2666KB Filename: A3J-1_Vigilante_oz6042.pdf
  • Supplement Filesize: 2365KB Filename: A3J-1_Vigilante_oz6042_article.pdf
  • help with downloads
 

Notes

* 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.

Scaling

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.

 

Terms of Use

© 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.