Hi-Tee (oz1781)

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Hi-Tee (oz1781) by John O'Sullivan 1963 - plan thumbnail

About this Plan

Hi Tee. Free flight power duration model for 1.5cc engines.

Quote: "my 1963 Hi Tee Open Power model, published in Feb 1964 Model Aircraft Magazine. This was #14 in the series first designed in 1958. Mk1 won the Irish Nationals in 1959. Mk3 was used in the 1960 Cranfield World Championships and Mk 8 and Mk 10 were flown in the 1963 Wiener Neustadt World Championships. They varied a bit in wing area and construction depending on whether they were Open or FAI models. The wingspan is 46 inches."

Quote: "A power duration model for 1.5 c.c. engines, designed by J. O'Sullivan.

THIS design is the latest development of a long series of contest power models, which have proved most successful during the last four years. Following much experiment with refinements such as elliptical wing-tips, undercambered section, etc , it was found that, as is often the case, the simplest, and most straightforward approach was the most successful. This model (the thirteenth) has, therefore, a flat bottomed wing section and straight taper-tips, with an uncompli-cated structure, which will present little difficulty to anyone who has previously built one or two flying models.

Construction. Fuselage. Cement engine bearers to ply doubler with Cascamite or similar. cut out starboard fuselage side and cement bearer unit, top and bottom in place. Fit 5/8 in pylon post and diagonals, which are built up as 1/16 x 5/8 in and sanded flush with sides, before addition of port side.

Remove from plan, add Pylon TE 3/32 x 3/8 in LE and Pi, P2 and P3, making sure correct incidence is given. Sheet cover the pylon sides with 1/20 or 1/16 in sheet Add fin, tail and wing mounts. Insert dural tube through rear fuselage for D/T line.

For a lightweight, finish fuselage by doping on tissue and finishing with one coat of Banana oil to keep weight down. For FAI use, the fuselage is nylon covered.

Wing. Assembly is straightforward and this type of spar construction is, in my opinion, unbeatable for its warp free characteristics..."

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Hi-Tee (oz1781) by John O'Sullivan 1963 - model pic

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User comments

The model published in Model Aircraft was Mk. 13. In my description on this page I incorrectly identified it as Mk 14. I have located the original hand drawn copies of Mk 14 and Mk. 15. Mk 14 was drawn in Oct 1964 and was the first to have a triangular Fuselage, which was afterwards incorporated in the Executioner. Mk 15 was a simplified sheet pylon version which was drawn up in August 1967, when I lived in a tent bush camp (mining exploration) in isolated Northern Peninsula of Newfoundland. Only one version of this was built by my wife who used it over a couple of seasons in Canada and Australia. It is hardly worth retracing the Mk 14 and Mk 15, but I can provide PDF files of the originals if you are interested. Also the versions used in the 1963 World Champs were Mk. 12 with Mk 10 as backup. I had a recent request from Jason Magill from New Zealand, whose father Ron flew in the 1963 WC and Ron was interested in building my Bootlegger. Ron Magill and I had some exciting adventures a
JohnOSullivan - 04/06/2012
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