Hi Martyn. The rule of thumb is that the outlet should be 2 times the area of the inlet. Yes the H36 is not good in this area. I am working on a solution to that and a cowl control device and yes will get an OZ EO and NZ would likely accept a GFA EO for the mod. It is a no brainer for outlanding training and wanting to power off quickly at the first available climb without shock cooling. Cheers. Nige.
-----Original Message----- From: dog@lists.riverland.net.au <dog@lists.riverland.net.au> On Behalf Of Martyn Cook Sent: Monday, July 23, 2018 6:47 PM To: dog@lists.riverland.net.au Subject: [DOG mailing list] Dimona Cowl Flap Dear Dimona Owners When using my H36 for field landing training an adjustable engine cowl would be very useful. Open up the bottom of the engine bay to allow plenty of cooling air through at a high power setting, then close the cowl to reduce the rate of cooling when the throttle was closed at top of descent. This would keep the engine warmer for the go-around as the student flew over the fence in what was hopefully a well-executed circuit. I realise that an adjustable cowl flap would need to be a certified modification, and I'm just checking with the group to see whether anyone has developed and installed such a mod, and how well it worked. On my aircraft the cooling air outlet is way smaller than the area of the intake. The usual wisdom with air-cooled engines is that the outlet needs to be a little larger than the inlet to allow for the air to expand as it gains heat from the engine. Kind regards Martyn -- --------------------------------------------------------------------- You are subscribed to the Dimona Owners Group mailing list. To unsubscribe, send email to: dog-unsubscr...@lists.riverland.net.au --------------------------------------------------------------------- You are subscribed to the Dimona Owners Group mailing list. To unsubscribe, send email to: dog-unsubscr...@lists.riverland.net.au
