If you work on royalties o_nly_ you should have a stronger hand in the whole
process in order to make sure it doesn’t go wrong at some point in sales or marketing.
If you do classical design consulting delivering a model or CAD at their doorstep and
that is the whole gig, the work should be paid on a hourly basis. If you are willing to risk
part of that compensation for royalties it is up to your liking and negotiation with the
client.
Delivering designs for speculative projects on a royalties only basis shouldn’t be.
mo-i