Extra 300S 60. Radio control sport-scale model, for 60 power.
Discontinued kit from Great Planes.
Quote: "Congratulations on purchasing the Great Planes Extra 300S. We've selected the 'S' because we feel it looks the best and it is truly meant to perform aerobatics. Among a few versions of the Extra 300 out there, another popular one is the 'L' which accommodates two passengers - one student and one flight instructor.
The Extra is a rather 'square shaped' 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 lite-ply. 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 300S 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. When you have a feel for your Extra 300S, the throws can be increased to high rates (illustrated in the instructions) to really showcase the aerobatic potential. The Extra performs surprisingly well on a ball bearinged, Schnuerle ported .61, and even better with a .91 4-stroke, but seasoned experts will surely want to get the most out of the Extra by strapping on a .91 2-stroke or a 1.20 4-stroke.
We hope you enjoy building and flying your Great Planes Extra 300S as much as we did flying the prototypes.
Precautions. 1. Build the model according to the plans and instructions. Do not alter or modify the model, as doing so may result in an unsafe or unflyable model. In a few cases the plans and instructions may differ slightly from the photos. In those instances the plans and written instructions should be considered as correct..."
The manual is available for download from the Great Planes site at http://greatplanes.com/manuals/discontinued.php
Direct submission to Outerzone.
Note CAD file is thanks to AlanSinclair.
Quote: "Hello... the Great Planes Extra 300s plans were extracted and converted from the instruction manual I did not redraw them, though they were re-scaled to the correct size. The DXF file does includes all the formers and ribs, which I did have to redraw... Thank you, Alan."
Kit manual, 50 pages complete.
PDFvector version of the plan drawing (extracted from manual pages, unscaled).
This plan is available for download in CAD format.
Did we get something wrong with this plan? That happens sometimes. Help us make a correction
Do you have a photo you'd like to submit for this page? Then email email@example.com
* 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.
© Outerzone, 2011-2019.
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.