[meanderingthemaze]

I was thinking of building some body parts, ie: fenders, hood, trunk cover... with a stretched canvas or other fabric. But I'm wondering how the wobble of the surface (over time and stretching, or just at high speeds) will affect aero. I'm guessing it will not be good. But again, this whole aero thing is not always intuitive to me. And I get it wrong a lot.

I could also seal it with a stiffener, or even almost do a very thin fiber glass treatment with some resin or something comparable. But, I'm trying to keep weight as low as possible. On the other hand, I know sometimes the weight is relatively insignificant compared to reduced drag.

This application is a custom built electric car for general purpose, mostly commuting. Let's say 70% Street/30% Highway. Max speed of 70mph. Considerable stop and go traffic, but it will have regenerative braking, so that will help a bit with recovering some energy.

Thanks.