I wonder if the H36 inlet/outlet ratio in itself doesn't help mitigate the possibility of thermal shock cooling?
Michael Stockhill Polson MT On Mon, Jul 23, 2018, 6:46 AM Nigel Baker <[email protected]> wrote: > 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: [email protected] <[email protected]> On Behalf > Of Martyn Cook > Sent: Monday, July 23, 2018 6:47 PM > To: [email protected] > 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: [email protected] > > > --------------------------------------------------------------------- > You are subscribed to the Dimona Owners Group mailing list. > To unsubscribe, send email to: [email protected] > >
