also, invariably there is oil mist in out air that goes through the cowl and it would probably pretty quickly start getting all over your windscreen and would be continuous PTA to clean it all the time

On Sat, Oct 12, 2024, 9:24 PM Rob McMillan robmcmillanpls@gmail.com <flyrotary@lancaironline.net> wrote:

Ah! Yeah, my F4U time is pretty limited... (But I am willing to fly one in case anybody is willing to loan me one!). I wasn't thinking of cowl flaps on top, but louvers that would be pretty much flush... 

It was the windshield slope pressure increase that I wasn't thinking about!

I really appreciate the great info shared in these emails!

Thank you!

Rob

On Sat, Oct 12, 2024, 5:17 PM Charlie England ceengland7@gmail.com <flyrotary@lancaironline.net> wrote:

If you're talking about putting the exit there, it would have to be near the front of the cowl, near the prop. (Been done with a/c engines; see Garrison Melmoth 2). But as you get closer to the windshield, external pressure goes way up, so the air would try to go *down* instead of up.

Virus-free.www.avast.com

On Sat, Oct 12, 2024 at 2:38 PM Rob McMillan robmcmillanpls@gmail.com <flyrotary@lancaironline.net> wrote:

Dumb Question here! 

Why don't we put cooling on the top of the cowl?

Seems like the heat would come out better...

On Sat, Oct 12, 2024, 11:50 AM David COOK hoursaway1@comcast.net <flyrotary@lancaironline.net> wrote:

Cowl on for cooling tests. We had good #s with it off then found not enough airflow with cowl on and had to add some out-venting to the bottom of the cowl with simple SS marine louvers. David

On 10/11/2024 9:15 PM EDT Doug Lomheim rv9flyer13b@gmail.com <flyrotary@lancaironline.net> wrote:

 

 

I now have 4.2 hrs. of ground run time on the 13B I rebuilt in Feb/Mar, and will now drop the oil and replace with Mobile One and keep exploring the upper limits of the power band!  I got a bit carried away today and pushed it up to 25 inches, and had to go full rich, so will have to tweak the EC2 some more above 16 inches.  So far I’m very happy with the temps while doing the ground runs, and with OATs from 90-95 degrees, the max water temp has been 178 degrees, and oil temp only 148.  I’ve been able to run 30 minutes straight without a cowling, without any temp issues, so am wondering if I’m going to be too cool once I start flying it??  :)  

 

Doug