About this Plan
Sunseeker. Radio control sailplane model. Thermal soarer for 2 channel radio. Wingspan 84in, chord 7in, wing area 518 sq in. Weight unballasted 30oz. Wing loading 8.5oz/sq ft.
Quote: "Hi Steve and Mary, Another plan for the collection. The original had faded badly and therefore I have had to redraw it in CAD format. Martin"
Direct submission to Outerzone.
Update 01/09/2020: Added kit instructions, thanks to RoyThompson.
Quote: "Hello, I have for you a copy of the build instruction & parts cutting list to be added to the Sunseeker from Bowmans model kits (OZ7684). This copy of the instruction comes from an original kit, unfortunately the original was also faded in parts, so I have retyped them and made one or two corrections. Best Regards
Quote: "Bowman Model Kits Sunseeker 74 in Two Metre Class Competition Thermal Soarer.
Although of simple design the SUNSEEKER is a sleek looking model capable of holding its own against all comers in any club event. When fully loaded with 12ozs of ballast speeds of up to 60 mph are not uncommon, but for a start 4 oz is ample for general sport and fun flying.
General Notes on Construction:
FUSELAGE: Take the two 3/32 balsa sheet fuselage sides and glue the 1/16 ply doublers to each inside surface making sure you have a 'handed' pair ie left and right. The 1/8 square hardwood strips can now be glued to top and bottom as far as former F4 and through to the position of the tow hook plate. Continue after plate to former F1.
Construction of the fuselage can now start, take both completed sides and stand upright joining together from the rear with small strip of 1/16 sheet sanded to slight angle, glue the two sides to this and allow to dry. Formers F5 to F8 can now be fitted and glued, allow to dry. Continue with formers F4, Towhook plate and former F3. ditto with servo bearers F2 and nose former F1.
Sand nose block to shape & fit. Before gluing on top and bottom covering sheet locate and epoxy outer cables through F5 & 6 allowing enough spare each end, this can be trimmed off at a later date when servos are fitted.
Top & bottom sheeting can now be fitted. Cut the sheet in suitable widths and glue CROSSGRAINED to the length of fuselage, starting from tail end this will give you lengths of 3 or 4 in each time. The 3/16 sheet can now be fitted and sanded to the front section, this LONGRAINED. The half inch sheet top hatch can now be made up. Cut the front and rear sections to length and glue. The centre section is removable and should be fitted with the small ply tongue and drilled to take the retaining screw.
Sand the whole to shape. Drill holes in fuselage sides and fit 1/4 in dowels. Make lid and complete ballast box. Secure by length of wire or tube supplied. This should be a tight fit.
TAIL & RUDDER: This is of straightforward construction and can be built over the plan from cut material supplied. Elevators should be sanded to tapering section. The rudder is of balanced design and should swing free over the sub fin which is glued to the fuselage. Cut slit to take tailplane which is also glued to fuselage. Fit control horns and link up with cables using clevises supplied.
WING: Again this is of very straight forward design and is in one whole section. The wing can however be made in to two sections for ease of transport if required. Instead of using the, ply dihedrial braces make two 8 swg wire dowels to this angle. Make six extra 1/16 ply ribs and glue to the first three balsa ribs at the root of each wing panel. These will act as doublers. Drill these ribs to take 8 swg brass or alloy tubes 6 in long .The holes should be about 1/2 inch in front of the main spar and about 2 in behind. For added strength fibreglass with 1 in bandage over the 1/16 top and bottom sheeting at wing root. Fit ribs as for whole wing design.
Wing construction: Make in two halves. Fit top and bottom main spars. Fit trailing edge next. Feather top trailing edge to get good fit with ribs, Glue top & bottom of each rib to trailing edge. Fit leading edge stock and sand to shape. Fit top and bottom sheets. You will find it easier to glue the first half inch or so and allow to dry and then continue to glue remainder over rib curves. The rear edges can be secured by pins until dry. Sand and fit wing tips. Very carefully cut first three wing ribs and glue in dihedrial braces. Keep one wing flat on building board and support outer panel until dry. Glue on root sheet covering. GLUE IN ALL SUPPORT STRIPS AND WEBBING BEFORE SHEET COVERING.
FLYING. The SUNSEEKER is a 'Maid of all work' quite happy on a gentle summer afternoon breeze with minimum ballast or a rough and windy March day with its maximum load of 12 oz ballast and all stops in between. It can be tow launched or if single handed use our HI-START PACK which will get you up to 300 ft or so in less than a minute.
NOTES. Covering can be with film or tissue. TISSUE covering will give the best results. Tissue doped and finished with a good fuelproofer such as TUF-COTE will make a far stronger and lighter wing than will film which has no strength.
We wish you good luck and many hours of enjoyment with your SUNSEEKER."
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