Most Cessna singles can fly with the window open. If at all you are curious about it, read the flight manual!!!!. .. .At Tinny has said, window open operation is not unusual in the Oz outback. I flew a window open 2 hour sector in a 210 in 41C heat at 6K with 5 "locals" on board who had not washed and been in the same clothes for weeks. My pump pack air freshener was empty in 10 minutes.. .. .But back to the original topic of speed brakes, I noticed that the N registered (but UK resident) C340 which ran out of motion lotion just short of Cairns Australia 2 weeks ago had retrofitted speed brakes on the wing. They were an aluminium rectangle about a foot long by 5 inches wide and located just outboard of the engine nacelle. A ram pushed it up into the airflow.. .. .Now I have no expereince with the 340, but on its smaller brother the 402, low power settings you dropped like a brick. Is the reason to be able to drop like a brick yet keep the power on to protect the geared engines?. . . . <small>[ 24 March 2002, 01:21: Message edited by: compressor stall ]</small>