Karatter (oz14409)


Karatter (oz14409) by KR Poulton, C Thurley 1970 - plan thumbnail

About this Plan

Karatter. Control line Rat Racer model for .40 engines.

Quote: "THE ORIGINAL 'Karatter' was conceived and designed in a day as a simple rat racer for use in the Blackburn Welfare MFC's display team, and as such needed to be impressively fast, yet attractive, and recognisable as a model aircraft!

This first model was rather handicapped with a in. plywood fuselage and a somewhat elderly ETA 29, well past its peak, but nonetheless flew at 103-106 mph. Later versions used the sandwich fuselage - as shown on the plan - which is 40 per cent lighter. Using a hot '40' engine in the lighter model would see the speed and acceleration rise considerably, and 120 mph should be quite within its capabilities.

Karatter is both quick and easy to build, as well as being a stable flyer, thus providing an ideal introduction to the very popular, and competitive rat-racing class.

Fuselage construction is straightforward, using 3/8 plywood or preferably (because it is much lighter yet adequately strong) a ply-balsa-ply sandwich of the same thickness. The fin consists of three cross-laminated layers of 1/8 medium balsa and is epoxied to the top of the fuselage.

Using a fretsaw, carefully cut out the slots for the wing and tailplane, as well as the cut-out for the engine mount. The ETA used 1/8 thick dural plates under the mounting lugs to provide clearance for the carb, and also to increase rigidity.

Taper the fuselage from the line shown to the rear, then round off the edges - taking the section to a knife-edge at the fin. A 16 swg mild steel skid is screwed to the 1/8 plywood let into the underside of the fuselage, which facilitates replacement.

The wing is made from a sheet of 1/2 in x 4 in medium balsa, with a 1/2 in sq hardwood LE cemented on. Taper the thickness to 3/16 at the tips, then carve the section shown..."

Karatter, Aeromodeller, February 1970.

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to RFJ.


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

Karatter (oz14409) by KR Poulton, C Thurley 1970 - model pic

  • (oz14409)
    by KR Poulton, C Thurley
    from Aeromodeller
    February 1970 
    36in span
    IC C/L
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 13/02/2023
    Filesize: 391KB
    Format: • PDFbitmap
    Credit*: Circlip, RFJ
    Downloads: 183

Karatter (oz14409) by KR Poulton, C Thurley 1970 - pic 003.jpg

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.