About this Plan
Astra. A 44 inch span, easy to trim rubber power competition model. From 1952 May Model Aircraft.
Quote: "ASTRA is an attempt at a competition rubber model large enough to catch the thermals (and stay in sight), but without the trimming difficulties one associates with Wakefields. This is not meant as a slur on that fine type of model; it is generally agreed, however, that the successful Wakefield men (with a few notable exceptions) have virtually to specialise and to fly nothing else.
Astra is of approximately Wakefield wing area, weighs 6 oz in flying trim, and has a very narrow fuselage and small amount of rubber. Models of this type are singularly easy to trim and one does not need to be an expert to get good results. Not possessing the kind of courage that rubber winding requires, the writer has never dared to put on more than 650 turns, which gives a motor run of around 45 sec and a climb to about 350 ft. The glide compares well with many sailplanes.
The original model won the 1951 RAF Championships (open rubber event) at Coningsby with two flights of 2 min 33 sec, and 5 min 00 sec. It had previously qualified for the championships by taking top place in the rubber team of Flying Training Command. On this occasion one of its flights clocked 9 min 13 sec OOS, which was submitted as an RAF record. A second model, the builder's second-ever rubber job, went OOS in its first week of life with a 6 min flight on very few turns. Best Astra flight so far is 13 min 15 sec d/t.
Wing construction. Build each wing separately on the plan, beginning construction with LE and bottom half of TE. (built up from sheet). Front of TE should be chocked up about 1/16 in to allow continuation of rib contours. Cement wing ribs in position and add top spar and wing tips. Now add top half of TE, and rib capping strips (top only). Next crack wing LE, TE and spar in the position shown on plan and prop wing tips up to 3 in to give correct dihedral..."
Supplementary file notes
Planfile includes article.
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
by Dick Twomey
from Model Aircraft
all formers complete :)
got article :)
Found online 15/11/2011 at:
Format: • PDFbitmap
Do you have a photo you'd like to submit for this page? Then email firstname.lastname@example.org
User commentsNo comments yet for this plan. Got something to say about this one?
Add a comment
* 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, 2011-2020.
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.