Nakajima Ki 43 Oscar (oz13436)


Nakajima Ki 43 Oscar (oz13436) by Brian Thorn 1999 - plan thumbnail

About this Plan

Nakajima Ki 43 Oscar. Radio control scale model of the Japanese WWII fighter plane.

Direct submission to Outerzone.

Update 15/11/2021: Added article from R/C Scale International, January 1999, thanks to RFJ.

Quote: "Oscar. Build a Japanese Army Fighter from our free plan. Nakajima Ki 43 Hayabusa, by Brian Thorn.

Flying my .40 powered Hellcat at our local site with the editor, he remarked that it would look good with something Japanese chasing it. This got me thinking about a quick build model that we could have some fun with, so I looked through my books when I got home from the flying session. I didn't want a Zero, and was looking for something a little less hackneyed. You don't have to look too far when you're dealing with Japanese WWII types as there are all shapes and sizes and some very exceptional fighters when you start to read the history of these aircraft.

The full-size Oscar aircraft entered service with the Japanese Army in 1941 and was still in operation at the end of the war, by which time it was totally outclassed by allied fighters. In the first year or so of the war the Oscar was a very successful fighting aircraft. Being highly manoeuvrable, allied pilots were told not to get into a turning dogfight with it, but were told instead to dive and zoom. The Oscar was lightly built and some of the early models suffered from wing failure in the dive, and also it could not withstand too much combat damage.

The Oscar had all I was looking for, so I drew it up from a combination of sources. There is no reason why the model could not be enlarged to 60 or 65 inch span, and with the addition of retracts would make a rugged and practical .60 two stroke or .70 four stroke powered model. I wanted something of about the same size as the Hellcat, which could be hand launched and transported in one piece, and flown when my more complicated scale models would be too much trouble.

Fuselage: I always make up a set of fuselage and tail parts first and although it's probably the most boring part of the construction it gets it out the way first and you have all the parts you need to build the model.

First, cut the sides from 1/4 in medium balsa. Cut the doublers from 1/32 ply. Laminate the two together using contact adhesive. I don't have to tell you to make a left and a right hand side, do I? Glue on the 1/8 x 1/4 longerons to the inside of each fuselage side. Next, mark a datum line on each former and mark out and drill F1 for the engine mount, fuel pipes, throttle cable, etc. Fit F1 and F2 to both sides using slow drying epoxy.

Fit the rest of the formers when F1 and F2 are dry. Fit the control snakes and tail wheel former, engine mount and fuel tank. Plank the top and bottom using 1/8 thick balsa. Don't worry about using 1/4 in balsa for the sides as much of it is sanded away to achieve the lovely rounded profile. Similarly, the 1/8 planking gets a good going over with the sanding tools. Although a thinner grade of balsa could be used to save a bit of weight it may be a bit thin in places and the 1/8 is a good combination of strength and weight. Once you've sanded it all to shape you will see just how much material is sanded and planed away.

On the prototype, I kept the linkage enclosed by sliding the tailplane through a slot in the side of the fuselage and hinging the elevators on afterwards. There's no reason why you can't cut a slot in the rear of the fuselage, slide the whole assembly into place and replace the cut out material. You can even take the snake out through the side of the fuselage and have the control horn on one elevator. I prefer to keep things as scale as possible and it keeps the back end tidy too. Next fit the fin and rudder. To save weight you can ignore the rudder servo and linkage and have a fixed rudder. I like co-ordinated rudder and aileron flying but it's not essential.

Wings: I had a pair of foam wings cut by Sid King of Cotswold Models to the templates I supplied him and they were superb in every way and arrive ready veneered. A built up wing would be simple enough to make but you would need to use the sandwich method to produce the extra ribs. I suggest you have ribs at about every 2-1/2 in. I prefer the robustness of foam wings on a model of this size due to the nature of the landings..."

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

Nakajima Ki 43 Oscar (oz13436) by Brian Thorn 1999 - model pic

  • (oz13436)
    Nakajima Ki 43 Oscar
    by Brian Thorn
    from RC Scale International
    January 1999 
    48in span
    Scale IC R/C LowWing Military Fighter
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 06/11/2021
    Filesize: 341KB
    Format: • PDFbitmap
    Credit*: JJ
    Downloads: 1129

  • Nakajima_Ki-43 | help
    see Wikipedia | search Outerzone
    Test link:
    search RCLibrary 3views (opens in new window)

    ScaleType: This (oz13436) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.

    If we got this right, you now have a couple of direct links (above) to 1. see the Wikipedia page, and 2. search Oz for more plans of this type. If we didn't, then see below.

    ScaleType is formed from the last part of the Wikipedia page address, which here is
    Wikipedia page addresses may well change over time.
    For more obscure types, there currently will be no Wiki page found. We tag these cases as ScaleType = NotFound. These will change over time.
    Corrections? Use the correction form to tell us the new/better ScaleType link we should be using. Thanks.

Nakajima Ki 43 Oscar (oz13436) by Brian Thorn 1999 - pic 003.jpg
Nakajima Ki 43 Oscar (oz13436) by Brian Thorn 1999 - pic 004.jpg
Nakajima Ki 43 Oscar (oz13436) by Brian Thorn 1999 - pic 005.jpg
Nakajima Ki 43 Oscar (oz13436) by Brian Thorn 1999 - pic 006.jpg

Do you have a photo you'd like to submit for this page? Then email

User comments

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



Download File(s):
  • Nakajima Ki 43 Oscar (oz13436)
  • Plan File Filesize: 341KB Filename: Nakajima_Ki_43_Oscar_oz13436.pdf
  • Supplement Filesize: 2601KB Filename: Nakajima_Ki_43_Oscar_oz13436_article.pdf
  • help with downloads


* 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.