I just set the reversed droopy blades on a outdoor table on a hot summer day with the connector end hanging off the table. Let nature warm them up and they will, over the course of a number of hours, go back to their original straight state. You may need to make adjustments from time to time or even leave a blade or two out longer then others. You can do this every few years when they droop again.
I just got 2 of the World Peacekeepers Blackhawks, 4 Assualt Little Birds, 2 Unarmed Little Birds, 2 Navy Helicopter Attack Choppers, 2 Main Battle Tank Russian, 2 A1A2 Abrams Tan, 2 A1A2 Abrams Camo, 2 A1A2 Abrams Green BBI 2 F/A-18, 2 A10-A1 Thunderbolt, 2 SU-27 Jets, 2 BBI F16 Viper jets, 2 BBI F-15 Jets, 2 BBI F-14 Tomcat Jets, 2 BBI Cobra Gunships, 2 BBI Aowia Gunships, 2 BBI Huey Transports, 2 BBI Marine Corps Light Armored Reconnacence Vehical LAV-25'S, 2 BBI Bradley Fighting Vehicles, 2 BBI Marine Corp AAV All this in the past 6 weeks. Each for around or under $100. I am currently taking them apart one at a time to detail paint them, sticker them, paint wear and tear details on. Cut and drill openings in the dashboards to back light, painting seats, putting light bulbs in lights. Cutting open non working sealed hatches and making them functional
The WPK helicopter is probably 1/24 scale but obviously has enough room to accomodate 1:18 figures. And the elite force is pretty close to 1:18 scale except shorter tail section