Sunspot (oz7318)

 

Sunspot (oz7318) by Roy Yeabsley from Aeromodeller 1948 - plan thumbnail

About this Plan

Sunspot. Free flight towline glider.

Quote: "A high performance sailplane designed by Roy Yeabsley, described by Bill Dean.

Outsize in gliders and one of the most consistent performers amongst the 1946 British designs, is Roy Yeabsley's ten foot Sunspot.

You can build it in just over a week and the total outlay is only a fraction of that needed for a petrol model. The ultra light wing loading (weight is only 2-3/4 Ib) rules out major crackups due to high speed contact with cars and other obstacles on the deck. Exceptional stability enables you to keep flying when other jobs are grounded by rough weather.

As for performance - the model has practically been all over the country on a solo goodwill trip! Best official flight at time of writing is 20 : 10 on a cloudless day - the model disappearing out of sight overhead dead above the launching point. On a 300 foot towline, consistent non-thermal flights of three minutes are turned in every time.

A dethermaliser is essential for this design. One of the parachute variety is used on the original model and is released by means of a slow burning fuse instead of the usual timer..."

Direct submission to Outerzone.

Supplementary file notes

Article, thanks to Algy2.

Corrections?

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

Sunspot (oz7318) by Roy Yeabsley from Aeromodeller 1948 - model pic

Datafile:
  • (oz7318)
    Sunspot
    by Roy Yeabsley
    from Aeromodeller
    February 1948 
    121in span
    Glider F/F
    all formers complete :)
    got article :)
  • Submitted: 18/12/2015
    Filesize: 1043KB
    Format: • PDFbitmap
    Credit*: Starfighter

Sunspot (oz7318) by Roy Yeabsley from Aeromodeller 1948 - pic 003.jpg
003.jpg

Do you have a photo you'd like to submit for this page? Then email admin@outerzone.co.uk

User comments

Unfortunately no indication is provided regarding the amount of outer wing dihedral.
Dieter Prussner - 06/01/2020
Bottom right corner of plan at wing tip. 9-1/2 inches at tip. Each side.
Mhodgson - 06/01/2020
Some diagonal bracing on the fuselage might be welcome for no great weight penalty, and if possible on the wings as well. The latter would not be so easy, but it might help with warping.
Miguel - 07/01/2020
This is a photo of my Dad with a Sunspot he built [more pics 003]. I think it was 1970, still have it in my garage. Dad liked painting the models, think it's rather more decorated now. All covered in tissue, doped and then painted in Humbrol enamel.
AndyG - 22/05/2020
Add a comment

 

 
 

Download File(s):
 

Notes

* 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.

Scaling

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.