Extra 300S 40 (oz12489)


Extra 300S 40 (oz12489) by Neil Liptak from Great Planes 1996 - plan thumbnail

About this Plan

Extra 300S 40. Radio control sport-scale model, for 40 power.

Discontinued kit from Great Planes.

Quote: "Congratulations and thank you for purchasing the Great Planes Extra 300. For the record, the model we have chosen to replicate is the Extra 300S.

The Extra is a rather 'square' airplane with well defined lines. Coincidentally, this makes it exceptionally easy to build and cover - especially for a semi-scale sport model. Framing the model is very straightforward as most of the structure features interlocking balsa and liteply. The Turtle deck sheeting may look a little intimidating but in actuality it is quite easy to apply if you follow the instructions and use the template provided to cut the sheeting.

Flying the Extra 300 is a thrilling experience - as it should be for such an aerobatic model! It doesn't take much elevator or aileron throw to put the Extra through its paces. Of course, the throws can be decreased to low rates (illustrated in the instructions) if you'd just like to take it easy and poke holes in the sky.

The Extra performs surprisingly well on a ball bearing schnurle ported .40 2-stroke but seasoned experts will surely want to get the most out of the Extra by strapping on a .46 2-stroke or a .70 4-stroke.

We hope you enjoy building and flying your Great Planes Extra 300S as much as we did the prototypes. Please inspect all parts carefully before starting to build..."

Direct submission to Outerzone.

Quote: "Howdy, y'all! Hope this finds y'all well, with everything going on these days. Attached are scans of the plans for the Great Planes .40 size Extra 300S kit; you already have the ones for the .60 size. Also attached are the manual and die-cut sheets from GP's manual page. Take care!"

Supplementary file notes

Parts call out sheets.


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Extra 300S 40 (oz12489) by Neil Liptak from Great Planes 1996 - model pic

  • (oz12489)
    Extra 300S 40
    by Neil Liptak
    from Great Planes
    58in span
    Scale IC R/C Civil Kit
    formers unchecked
  • Submitted: 08/09/2020
    Filesize: 376KB
    Format: • PDFbitmap
    Credit*: jmdauge

  • Extra_EA-300 | help
    see Wikipedia | search Outerzone

    ScaleType: This (oz12489) 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 https://en.wikipedia.org/wiki/Extra_EA-300
    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.

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Download File(s):
  • Extra 300S 40 (oz12489)
  • Plan File Filesize: 376KB Filename: Extra_300S_40_oz12489.pdf
  • Supplement Filesize: 1320KB Filename: Extra_300S_40_oz12489_instructions.pdf
  • Supplement Filesize: 149KB Filename: Extra_300S_40_oz12489_parts.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.


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