G.B.IX oz1990

 

G.B.IX - plan thumbnail image

G.B.IX - completed model photo

Submitted to Outerzone: 08/12/2011
Outerzone planID: oz1990 | Filesize: 294KB | Format: • PDFbitmap | Credit*: avernon, DBHL, theshadow

   

About this Plan

GB IX - Free flight Glider.World championship class glider. October 1957 Aeromodeller. Direct submssion to Outerzone.

Quote: "An easy to build A/2 glider with latest design features and contest winning performance by Geoff Brewin.

THIS DESIGN was originally influenced by Eddie Caton's Zephyr of old Fairlop days when the A/2 specification was first announced. Mark I featured a diamond fuselage, polyhedral wings with end plates and high set tail. It was first flown in the summer of 1952 and on its third flight covered a distance of 30 miles. The second model was similar and flew very consistently, gaining Geoff's 'A' certificate in 1952. Then Mks. 3, 4 and 5 featured longer fuselages and improved performance. No. 5 gaining third place at Northern Heights, 1955, after disappearing upwards into the blue sky, following a D/T failure. It was found a year later after "wintering" in the open!

Mks. 6 and 7 were the first to feature the parallel wing with large end fins and had low set tailplanes. The performance was good, but towing apt to be tricky in winds. In December, 1955, whilst flying for the 'B' certificate, one of these models made eight flights all over 2:45. Next versions, Mks. S and 9 were similar to 6 and 7 but reverted to the high tail, which solved the towing trouble and had the trailing edge of the S.I. 64009 section drooped in a similar fashion to the Hansen section. No. S qualified for the 1956 Trials and placed 24th. Brian Tyrell built the No. 9 design qualifying for the team this year.

Construction should begin with the fuselage which is a conventional diamond section and the plan details should be adequate. Ensure that the pylon and fin are in line with one another when adding these to the basic square box..."

Update 06/06/2016: article pages, text & pics added, thanks to RFJ.

Update 09/10/2018: Replaced this plan with a clearer copy thanks to DBHL, theshadow.

Scan from DBHL, cleanup by theshadow.

ref DBHL-5127.

Direct submission to Outerzone.

Supplementary files

Article pages, text & pics.
Previous scan version.

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oz1990 datafile

G.B.IX  
by Geoff Brewin
from Aeromodeller
October 1957 
66in span
Tags: Glider F/F
all formers complete :)
got article :)

 

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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.

 

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