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.
   --
   Paul Lamar ...No rotor no motor.



Thanks Paul

I thought the orientation might be a problem.
My camera is faulty at the moment. I’ll try and borrow a camera and get
some photos to you.

Thanks

Steve Izett

OK Steve. I always like a challenge :)