Wyvern (oz2002)


Wyvern (oz2002) by Geoff Dunmore from Aeromodeller 1951 - plan thumbnail

About this Plan

Wyvern. Free flight sports power model with .75cc Mills power. June 1951 Aeromodeller. This is a modern redrawn plan in PDFvector format.

Quote: "Build this Bowden Contest winner - a precision baby of proven performance for motors up to 1 cc by Geoff Dunmore.

The Wyvern was designed in 1948, and has since flown with great success, winning the Bowden Trophy at Cranfield Aerodrome in 1949, despite the strong winds and rain prevailing during the course of the contest.

The main features of the design are its tricycle undercarriage, twin fins and dihedral tailplane. The pylon effect, ie mounted fairly high and set well forward, the centre section of the wing being cut back to suit the contours of the fuselage, is further elaborated by the use of the NACA 6409 airfoil, which I have used on my pylon designs with great success. The model is powered by a .75 cc Mills diesel, although suitable engines ranging from .5 cc to 1 cc could be used.

Trimming and Flying: On the original model it was not found necessary to make any alteration to the trim, but where a different engine has been fitted this will probably alter the balance. Gliding tests should be carried out, and if any appreciable alteration has to be made, it is best to add a little plasticine to the nose or tail, and only make minor adjustments to the tailplane setting.

Having obtained a flat and straight glide, start the engine and run as slowly as possible. Wait until there is only a very small quantity of fuel in the tank, place the model on a flat surface, and let it take off. After one or two short flights, during which the model should have been finally trimmed and the engine gradually speeded up, long flights can be undertaken..."

Supplementary file notes

Article page, text and pics.

CAD file

This plan is available for download in CAD format.


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

Wyvern (oz2002) by Geoff Dunmore from Aeromodeller 1951 - model pic


Wyvern (oz2002) by Geoff Dunmore from Aeromodeller 1951 - 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):
  • Wyvern (oz2002)
  • Plan File Filesize: 111KB Filename: Wyvern_BW_Print_oz2002.pdf
  • Supplement Filesize: 1253KB Filename: Wyvern_BW_Print_oz2002_article.pdf
  • CAD Zip Filesize: 265KB Filename: Wyvern_BW_Print_oz2002_cad.zip
  • 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, 2011-2020.

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.