Guide

The Mechanics of Chassis Development

No. It doesn't matter how many CDs you employ (the maximum is 5) the only CD who contributes to next season start design is the active one. With multiple CDs, each being active for a proportion of the current season, you will start the next season with the same number of design points as you would if you only employed one CD but they will distributed more evenly across the eight attributes.

I hope this makes sense, see the examples in post number 2.

Yes it's true but your active CD at the moment is L21, which of course is one lower than your team level. If you continue to use this CD until the end of your current season you will have a slightly lower start design next season. Depending on how long he has been active you might already have affected it.

Also, remember you should be aiming to have both a L22 CD AND TD if you want to maximise research this season. Your research for one attribute at L22 should be 34%, if it is lower it is because your VD and/or TD need to be replaced.

Correct, you do not use supplier points that take you above 200 in any of the design attributes. In your custom engine example you will indeed waste 15 points.