Gliders > Scale
Laister Lawrence Tech IV
marc hecquet:
I have built the inner panel flat and square to the jig without any difficulty ( ribs 1 to 14), everything fits well. Some adjustment on the drag spar is necessary to fit correctly with all ribs ( 2 to 8) Don't forget ( as Idid first !) to drill a hole on its end to allow a passage for radio wires. I have made some minor modifications of my own such as the rib 18 which has been doubled with 1mm plywood. The root junction aileron is often a weak area. The trailing edge is made with two strips of 0,6mm plywood, 12mm wide, and a balsa infill to provide the good shape. You will notice the nice curved shape that the trailing edge naturally takes (ribs 14 to 18) I will add triangular piecs to reinforce the glueing of all rear ribs to the spar.
marc hecquet:
The work on the outer panels is well advanced. No need to use the plan. I first glued the rear ribs on the spar using a square and the I glued the tail of the ribs on the TE using a template that gives equal distance. The trailing edge of these panels is made with 2 3x3mm spars glued on strips of plywood (0,6mmx11mm) that protudes about 3mm to provide a gap for the aileron leading edge. A 3mm balsa strip joins the spars between ribs and there will be also a 3mm balsa infill with vertical grain between the spars; The ailerons will be built in the same way in the prolongation of the outer panel with a 1,6 ° washout along their trailing edge.
Fred:
Salut Marc,
Can you take a picture of the TE?
The TE in 06mm hold in 2 small "spars" right?
marc hecquet:
here they are, Fred..
The ailerons are being built. The basic structure is built along the trailing edge of the outer panels of wing.So all ribs come face to face and the whashout naturally comes with a 3mm wedge under rib 42. A vertical grain balsa 3mm is glued against the 3mm spars. Then the structure receives the balsa trailing edge which is sanded to shape ( 3mm balsa infill between 2 0,6mm plywood strips) Tip blocks are added and sanded too and planked with 0,6 plywood. I have added diagonal ribs that were not featured on Tom's drawings but he will add them later for we have a document showing it. Anyway this will give stiffness to the ailerons.
Next step, glueing the balsa leading edge of the ailerons, plywood parts on TE and LE, gussets ,caps and hinges
marc hecquet:
The ailerons have been completed. I have assembled the gull winged LT IV on my favourite airfield.
She looks great indeed. Next step, planking of the wings...
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