Hi Paul and list

I'm beginning to ponder cowl flap configurations for my Glasair SII RG.
Here is my question.

Can anyone offer any experience on the effects of a retractable nose gear
door opening on the overall cooling and cowl flap system?
Do I for instance require less cowl flap on the ground and in early climb
because of the gear door being open, or is the orientation of the average
nose gear door not conducive to lowering the pressure under the cowl?
Will we want the gear door closed to early to be helpful in cooling during
climb?

Thanks again for the list and all the help along the way.

Steve Izett
Perth WA

The orientation of the average nose gear door  is not
conducive to lowering the pressure under the cowl?

It may increase the back pressure on the radiator.

It is perhaps better to enclose the retracted nose gear in some sort
of a housing.

On the plus side it is only open for a few seconds on take off.
The usual problem is oil over heating on take off and climb out.
One way to mitigate this is increase the size of the oil pan.

That Glasair retract is quite a cooling challenge Steve. Send some pictures
of what you have so far and I will see if I can make any recommendations.