We fly a Cessna 182 Skylane that has been carefully maintained and upgraded for skydiving.
ZS-FFB has a Continenta  Engine rated at 230 BHP. We have added wingtip extensions which help slightly with lift induced drag and allows us to climb to altitude just a little quicker.
We have removed the standard door of our aircraft and changed it for an “in-flight door” this allows us to close the door before take-off and for twenty five minute flight to altitude. Just prior to the skydive the door is opened, it hinges upward and  the skydivers exit. The pilot then closes the door for the descent and landing.
This makes for a safe and comfortable twenty five minute flight with no wind buffeting and freezing your buns off with an open door.