Prince Hal (oz2115)

About this Plan

Prince Hal (Son of King Harry). Free flight rubber model.

The King Harry (oz3824) first appeared in Aeromodeller August 1945 and was a design by K Edgerton. This here is a later version, redrawn for the 50th anniversary, in Aeromodeller August 1995.

Update 27/5/2022: Added article, thanks to algy2.

Quote: "This design was first published as King Harry in Aeromodeller fifty years ago this month as a half-size drawing that omitted some details. Subsequently the 1946 Aeromodeller Plan Fare repeated the plan and helped a little by reporting that the span was in fact 24-3/4 inches.

In the full size plan we now publish I have created the missing details and included a few modifications. So Prince Hal is a natural successor but cannot truly claim to be a copy of King Harry. It is an outstanding performer for restricted flying sites and it should give equal satisfaction to beginner and expert alike.

Fuselage: Cover the plan with cling-film and start building. Select the two strongest lengths of 3/32 sq you have for the longerons. You might need to steam bend the lower one. Pin the wood over the plan, placing the pins either side and not through the wood. Take particular care to ensure the wing and tail platforms are true. Cut the vertical spacers and glue in position, then the diagonals. Finally add the sheeting to the nose and rear motor peg and the gussets.

Construct the second fuselage side over the first one. Either use cling film between the sides or carefully slice them apart with a very thin blade when the glue is set. It is advisable to provide some reinforcement round the motor peg hole, which can be a disc of ply or celluloid. Prepare the card formers AA and BB, notching the corners to take the longerons. Then proceed as per instructions written on the plan.

Wing: Make card templates for the ribs, wing tips and dihedral brace. Cut out the 12 ribs from 1/16 sheet, pin into a block and sand the outline smooth. To make the shorter tip ribs, take two of the ribs already cut and trim to length and profile as shown dotted on the plan. Another rib makes a good template. Be sure there is sufficient length at the rear to lap over the 1/16 tip outline.

Prepare the 1/4 x 1/16 for the spar and trailing edge. The spar needs a small piece cut away on the underside at the centre section, to give the dihedral angle. This triangular scrap can then be glued on top of the spar to give a hockey stick effect. At the other end of the spar a 1/16 notch on the underside fits over the tip outline.

Pin the trailing edge on the plan and using strips of 1/16 sheet, 1/2 in wide, build the tip outline. Glue the rearmost two, but leave the front one till the leading edge is in position. Place the ribs on the spar and locate over the plan, pinning in position. Glue the ribs, making sure to use the dihedral template to set the root rib at the correct angle. Fit the leading edge and glue in the front piece of the tip material, which has its front edge chamfered 45 degrees to fit under the leading edge. Finally add the 1/16 gusset to the root rib. When dry, remove from plan and shape the tip outline using the template.

Build the other wing in a similar manner. Set the wings up on a good flat board with 2 in under each wing tip. The two 'hockey stick' projections should rest flat on the plan and meet at the centre line. Secure the wings with pins through the root gussets. Add the centre section leading edge, trailing edge and sandwich the hockey sticks with two pieces of 1/16 sheet for the full depth of the ribs. When set cover with 1/32 sheet. To assist forming this shape, lightly dampen the top surface..."

Supplementary file notes

Article.

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