G.B.IX (oz1990)


G.B.IX (oz1990) by Geoff Brewin 1957 - plan thumbnail

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 file notes

Article pages, text & pics.
Previous scan version.


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G.B.IX (oz1990) by Geoff Brewin 1957 - model pic

  • (oz1990)
    by Geoff Brewin
    from Aeromodeller
    October 1957 
    66in span
    Glider F/F
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 08/12/2011
    Filesize: 294KB
    Format: • PDFbitmap
    Credit*: avernon, DBHL, theshadow

G.B.IX (oz1990) by Geoff Brewin 1957 - pic 003.jpg
G.B.IX (oz1990) by Geoff Brewin 1957 - pic 004.jpg
G.B.IX (oz1990) by Geoff Brewin 1957 - pic 005.jpg
G.B.IX (oz1990) by Geoff Brewin 1957 - pic 006.jpg

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User comments

Pics of GB.IX A2 glider [model photo & more pics 005, 006]. Really like the quirky look, T tail and well thought out design.
Simon Dixon - 04/01/2020
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