holes

[neandethal]

Hi folks,
still on with building my motorcycle streamliner and have a question about drag. I am running a turbo which will be near the top of the fibreglass fairing and obviously running pretty damn hot. I would like to add some means of heat dispersion but read that louvres are bad news for drag coefficient, and wondered if a plethora of say 6mm holes would have the same negative effect or would actually be ok. Obviously i can add heat shield cloth and foil to stop the fiberglass cooking but keeping the engine bay cool is a good idea.
any thoughts/experience most welcome, cheers Ian

[donpearsall]

Have you looked into a NACA Inlet? I think that would be much more streamlined and have more volume than holes.
I built a fairing that had a NACA inlet for the turbo intake and although I did not have a way to test it, it seemed like it did not add too much drag.

Don

[neandethal]

Hi Don, was certainly going to use NACA for the intake, wasnt sure it exhausted in the same way but an opening is an opening, cheers.