Heinkel P.1076 (oz14083)

About this Plan

Heinkel P.1076. Radio control scale model for electric power using Speed 400 motor.

Quote: "Heinkel P.1076. Graham Reddin presents his latest, for 400 or PSS.

The recent phenomenon of Speed 400-powered scale models has opened up a whole new avenue of model design possibilities. Because of the low investment in both rime and money required to build these models, even obscure prototypes are now a viable proposition. Their flight performance is entertaining to even the most jaded of fliers, and quite out of proportion to the unrivalled cheapness and simplicity of the diminutive Speed 400 motors.

My search for a sleek and unusual prototype for Speed 400 power led me to the Heinkel P. 1075, a planned development of the Heinkel He 100 incorporating a more powerful engine and longer, forward-swept wings.

The resulting model flies a treat, is fully aerobatic from level flight on either the 7.2V or 6V motor, and will undoubtedly keep your club-mates guessing as to its identity! The distinctive planform and racy lines look very appealing as it tears around the sky at a rapid rate of knots. If you are looking for cheap thrills, this model will oblige!

Construction: This is a mixture of balsa and blue Styrofoam, covered in brown paper, in the fashion pioneered by Chris Golds. Those of you who have used this type of construction before will understand just how amazingly versatile and easy blue foam is to use.

Don't be put off if you are a 'traditional' model builder - do give it a try. The small investment in time required to equip yourself with a hot wire cutter is of great benefit in the long term. You will wonder why you used to spend hours or even days cutting out multitudes of intricate components from balsa to form complex shapes, whereas with blue foam you can achieve the same result in just minutes.

Brown paper applied to the foam with a 2:1 mix of PVA and water provides remarkable torsional strength at very light weight (it is, in effect, just a thin wood veneer), and is virtually ready for painting as applied. On more than one occasion I have been asked (of one of my foam and brown paper aircraft) is that fibreglass? and I can assure you I spend the absolute minimum time finishing and painting my models (I can't wait to go flying!). It is simply an indication of the most acceptable results you can easily achieve using this technique. Here endeth the lesson!

Wings: Cut a pair of wing blanks from blue foam, then make up a root and tip template for the hot wire cutter from Formica or 1.5mm ply. HWC foam cores, ensuring that the trailing edge of the tip template is raised 2mm to build in the correct washout. Attach hardwood strips as a cutting guide, and HWC wing roots to the correct dihedral angle as shown.

Pin one wing panel to the building board and prop up the other panel 80mm at the tip to correspond to the correct dihedral angle (which gives 40mm under each tip). Epoxy the two wing halves together. Epoxy the 9.5mm balsa trailing edges in place - do not separate the ailerons at this stage. Sand to the aerofoil section shown, ensuring that the trailing edges reflect the progressive washout incorporated in the foam cores.

Shape the tips. Cut the ailerons from the wings now, as well as the centre-section, trailing edges, and make up the 18 swg wire torque rods as shown complete with aluminium tube bearings..."

Direct submission to Outerzone.

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