I bought the homebuilders DVDs, scratch building zenith rudder and metal working 101. But the one thing they forgot to cover is drilling the rudder tail skin. I wrote to the video maker about it and he said to lay the rudder skeleton inside the skins and trace it, then remove that and drill pilot holes in the centre of the trace. I was wondering what method did you use to match drill the skins to the ribs?
When you where making your wing form blocks, did you make a right and left crush plate for your wing ribs? Or use one form block and just flute the ribs to get to your desired finish
My wife just asked what I was doing, I said I'm texting a fellow metal artisan...lol
Can't wait to get started, but more questions..lol
The wing shape for the 640 is a graph with points of refrence, I was playing around with it and have the lines draw out. but the leading edge shape has me concerned. I'm using a flexible ruler to make the leading edge shape, but there seems to be a lot of fudging that could be done as the curve is concerned. Should I put the flex ruler straight up and down on the nose then bend it back to the points.
I was thinking I might buy a nose rib and rear rib, and lift the shape off that. It just seems like such an important shape.
I`ve also been in contact with Dr Steve Adams(got his address from the CH-640 matronics list), he has been very helpful and answered many questions but he built his plane from a quick build kit so would not have the intimate knowledge that you and the other scratch builders do. But Steve and yourself are a great resource for when the plane is nearing completion and taking flight.
Very nice to meet you, I consider you part of the Golden Age of the CH-640. Ive read the complete Matronics old list and saw your errata. You were around when Jeff Paden and Mr Tremblay were active and building.
Ive looked at Jeff Padens site and Mr Tremblays on Archive.org but unfortunately the pictures are all missing.
I`m at the form block stage and I study the plans daily there is so much to learn. I have a few questions if you dont mind. I have a ton of them..but i`ll keep it short today...lol
I`m going over the Errata ....I have a question about this item
Drawing 640V1, Revision 4 - Item 1, Wing Spar Extension. The plans dimension "~405" to the first lightening hole. Change this to 350 mm.
640V2 wing spar extension assembly shows the lightening hole half-way between the two (L) pieces.
Adding the dimensions: 25 mm for spar cap overlap + 225 mm from overlap bend to first (L) + 100 mm from first (L) to center of lightening hole = 350 mm
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