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Cost of aircraft design

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F

fly scared!

I'm sure the topic surfaced many times here, but I could not find a specific thread.
I'm familiar with the one-off design cost for sailboats (ok, very different context), which is usually about 5% of the foreseen total cost for a "standard" configuration.
Speaking of experimental aircrafts, what could be the cost of the design itself, meaning:

- slack rule compliance (FAR 103, european ULM et c.)
- from specifications / conceptual design to prototype
- excluding design costs of testing materials, prototyping, certification et c.
- including licence to build a small series (10 ?), documentation, manuals

I guess most of the job has to be done anyway, being it a microlight or a fast experimental, so maybe an absolute value would be more meaningful.
But let's say the finished product would cost (one-off) around 50k $, "cheap labor" (homebuilder!) included.

What is the usual agreement with the designer in US, and in the UE ?
 
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