G'day Tom Not sure how standard mine was when I got it as it had been through a couple of owners. So not sure what i'm about to describe is relevant to all or just me (h36 mk1) I was suffering with a bit of an asthmatic air flow too. I drilled holes in the cover on the rear bulk head but that didnt seem to make a lot of difference. What i did find however,was that in the duct behind the cowling (where the vent flap is) there was a piece of metal riveted in place to presumably stop water running in from rain etc. this was great at stopping the water but it also gave the vent flap two shut positions. Ie. when the vent was closed it was sealed against the firewall, and when it was "open" itwas sealed against that piece of metal. To remedy the situation i think (about ten years ago now so memory is a bit sketchy) i turned the flap upside down shifted the hinge position from the top to the bottom (cable attachment point will also need to be shifted). This allowed the vent flap to open further but still divert rain into drain just ever the magneto(?!?!- yes i do have a hose fitted to it 😁) unfortunately this was done after a trip to the morning glory so a trip home across central australia was one bathed in sweat. But actually having a vent flap that opened all the waymade a huge difference cheers ric ________________________________ From: [email protected] <[email protected]> on behalf of Tom Preisser <[email protected]> Sent: Sunday, August 17, 2025 10:50 PM To: Laurie Hoffman via dog <[email protected]>; Laurie Hoffman <[email protected]> Subject: Re: [DOG mailing list] Cockpit Ventilation
Thanks ! How many holes? How big ? Picture someday? We suffered again today, but the soaring was excellent 👍 On Sat, Aug 16, 2025, 6:01 PM Laurie Hoffman via dog <[email protected]<mailto:[email protected]>> wrote: We have numerous holes punched i that rear access cover to allow for the cabin venting. I've noticed that whenever there is baggage on the luggage deck that is allowed to block these holes then the cabin ventilation is a lot poorer. Best Regards Laurie On Sunday 17 August 2025 at 07:38:29 am AEST, Tom Preisser <[email protected]<mailto:[email protected]>> wrote: This summer in Maine usa we have experienced a lot of very hot days and I have begun to consider strategies to improve the airflow through the cockpit from the cabin air inlet and the flip out canopy windows. I saw pictures of an h36 in Hungary that had a circular vent in the aft bulkhead approximately 125 mm in diameter, right in the center of the access cover/fuel tank hold down. I think it was to allow air to exit the cockpit, allowing more flow from the eyeball vent/naca duct up front. ? Has anyone come up with solutions to the anemic cockpit airflow ? Has anyone tried taxiing with the canopy open ? (I haven't) Cheers
