A-Rat (oz9262)


A-Rat (oz9262) by Dave Clarkson 1970 - plan thumbnail

About this Plan

A-Rat. Control line model for Class A Rat Racing, using 2.5 - 3.5cc engines.


THE AUTHOR'S interest in A-class rat racing started with a contest run by Avro Lancaster MAC last summer at Woodford. The rules for this contest are compared below with normal A-class rules and are worth serious consideration for club contests because organisation required is minimal, and a large entry is not essential.

This contest was enormous fun and the designer returned the winning time of 4.10 for the five miles. A run later on the same day using one pit-man gave a time of 3.46 for the five miles. The fastest model in the air at the contest was G.15 powered, and was timed at 103 mph compared with a timed speed of 86 mph - obtained using the author's-old 120 sq in flat-bottomed wing model which was 'crawling' with drag.

These results set his brain working - if he could build a really clean model, 100 mph should be possible using a standard MVVS 2.5 TRS (now on its third con-rod) and a 3.10 five-mile time could be attainable. Borrowing constructional and design features from 'big' rat racers, and aiming for a 15 oz. all up weight with a 90 sq in wing resulted in A-RAT.

Since A-class rat racing is still in its infancy no great strings of contest successes can be claimed for this model. However, it has proved to be a reliable and sturdy machine - very important in the rough and tumble of competition flying. One word of warning concerning this model is that it was designed for flying over tarmac, and although landings on smooth grass are possible, anything other than this will produce cart-wheeling. Although A-RAT is tough enough to withstand this traetment, it is a most undignified way to arrive.

Construction is traightforward, but remember that accuracy is directly related top strength. Begin by cutting out the 3/8 sheet wing core... "

Scan from DBHL, cleanup by theshadow.

ref DBHL-7675.

Direct submission to Outerzone.

Update 05/06/2018: added article, thanks to RFJ.

Supplementary file notes



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

A-Rat (oz9262) by Dave Clarkson 1970 - model pic

  • (oz9262)
    by Dave Clarkson
    from Aeromodeller (ref:1074)
    June 1970 
    26in span
    IC C/L
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 24/09/2017
    Filesize: 274KB
    Format: • PDFbitmap
    Credit*: DBHL, theshadow
    Downloads: 943

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):


* 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.


Terms of Use

© Outerzone, 2011-2024.

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.