Shown in Wingmaster n°25 (november-décember 2001 - french aircraft modeler magazine), the basic onmoulding technic had already helped me many times to have crystal clear canopies. But here comes another problem when you have to deal with canopies with varying shapes, that goes up and down, like the blister of a Mosquito PR XVI or like a Malcom Hood canopy of a P-47 Razorback. You can't just apply the rhodoïd on the master...without induction, you will obtain a result as the red line on this pictures on the right.

So, i decided to create a thermoforming machine.

For this, 4 elements are required :
- 1 regular heating source
- 1 frame to support the transparent plastic sheet
- 1 box, pierced on its to, to obtain an uniform induction
- & 1 vacuum cleaner (+ flowers for your wife if she is recalcitrant).

Heating is insured by a hotplate (between 14€ to 16€ in supermarkets). Just behind that, i've put a box which upper side is shaped to receive A-4 sized sheet (you can do it smaller). The side opposite to the plate is pierced to plug the vacuum cleaner pipe. On the upper side, it is pierced by many holes to distribute the induction.

i then realised 2 identical frames between which will be inserted the celluloïd sheets. The inner frame is fixed to the box by an hinge, in order to put the celluloïd sheet on the hotplate when you rotate it. Butturflies srews maintain the 2 frames, trapping the plastic sheet.

Positioned on top of the hotplate, the sheet will soften. As soon as it seem soften enough, you just have to turn the hoover on & rotate the frames on the master. And 'voilà' heating & induction will do the rest for you.