Laister Lawrence Tech IV

[marc hecquet]

I am new on this forum, here are  the latest pictures of my scale building of the time.: the Laister Lawrence Tech IV ( 1:3 scale ,  wingspan 4,75m), the new  shorkit on Aerosente.
 You can see  the beginning on RC groups  :page 3 to 9

http://www.rcgroups.com/forums/showthread.php?t=1077410&page=9




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[billscottni]

Beautiful model and workmanship    Welcome to GliderIreland

[andrew wallace]

lovely bit of building  
 :clap:  :clap:  :clap:

[marc hecquet]

The work has  begun with the last step of the  building : the wings. The spars  had  already been built as  you have seen. I first verified  the right  junction of the 2 first root ribs with the fuse  and  placed the incidence indexing parts. Then I glued  all the front ribs ( w1 to w44) with the spar  flat on the jig. No problem except I forgot to shape the  top and bottom spar caps to  the right depth at the extremity  but this  can be done later. I verified  the good  alignment of the ribs  by tracing  a  data line on the spar and with a stick as a false leading edge when glue  is drying and then glued  the definitive leading edge. The result is nice to look at. i like  the smooth  curve of the  gull wing.

[the Pope]

lovely build, Marc

[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 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...

[woodstock]

Beautiful  :clap: !

[marc hecquet]

I started to plank wings with 0,6mm plywood.As the wings are covered and painted, I have chosen to build a false balsa leading edge and to place plywood panels instead of wrapping the whole front part of wings as I usually do on plywood varnished models. This method will be faster. A hard wood leading edge will be installed after planking. Where panels join, I placed extra ribs to increase glueing surface . The panels are not simply placed side by side , their edges are sanded to allow them to be slightly superposed on about 3mm, see pictures.It 's important for wings strength and reaction in the air. There will be 20 panels for a wing. ,top and bottom. At the curvature, the panels are narrow to keep the smooth curvature and the right shape of the wing.

[marc hecquet]

Here is she, the wooden lady. The strcture of the  Laister lawrence Tech Iv  is completed . Next step, covering and painted. Let's hope  she will please you... :wink:




Here she is with my new 6m glass fibre Ventus 2CX, 60 years  between the two birds...

[billscottni]

That is a piece of art! Absolutely beautiful workmanship  :clap:  :clap:  :clap: