Blue Diamond (oz9686)
About this Plan
Blue Diamond. Free flight glider model, with parasol wing mount. Wing area 288 sq in. Uses RAF-32 airfoil section.
Quote: "BLUE DIAMOND was built in the early summer; the span being about the limit for gliding in a small public park, such as are usually found in any urban district. Wing span is 60in with a chord of 6in, the popular parasol wing mounting is employed and the tail placed high on the fin to reduce risk of damage on landing. In the first contest in which it was entered, the M.E. No. 1, aggregate was 970.2 secs. (Best flight 672.2 sec, OOS) Using the model again in the Thurston Cup, the aggregate was 666.0 secs., one flight being 360.4 secs. In the SMAE cup the model flew away again, this time OOS for 13 min 53 sec and landed three fields away, the aggregate for three flights being 1,163.4 sec, which placed it fourth in the competition. So much for the model's performance to date.
Fuselage Construction. The two sides are built in the usual way as for slabsiders. The hardwood longerons are first bent or steamed to the correct shape before the uprights are cemented into position. It is wise to make four cross struts for each bay, these all being the same. This makes it simpler to secure a truly square fuselage. The diagonals or cross-bracing struts can be put in after the two sides are joined together. Fill in front of fuselage with in. sheet hardwood to form back for weight-box. The hardwood nose and hollowed out laminations of balsa comprising the weight-box are the next step..."
The Blue Diamond design appeared in Aeromodeller Spetember 1946 (thanks Aeromeddler). This here is a later, re-drawn version of the plan. Legend reads: "Designed by W Jones. Drawn by FEJ White."
Scan from DBHL, cleanup by theshadow.
Direct submission to Outerzone.
Supplementary file notes
Article, thanks to Aeromeddler.
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
Do you have a photo you'd like to submit for this page? Then email email@example.com
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, 2011-2022.
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.