The Army Aviation Museum Foundation

When the U.S. Army bought nearly a thousand de Havilland DHC-2 Beavers during the 1950s, they knew they were getting a rugged utility workhorse. What they didn't realize was just how much "character" came built right into the airframe.

To get that legendary STOL performance, the Beaver utilized a unique hydraulic flap system. But this wasn't an "switch and forget" setup. To lower the flaps, the pilot had to select the desired position on a selector valve and then manually pump a hand lever located on the floor between the seats. If you needed full flaps in a hurry during a tight tactical approach, your right arm was going to get a serious workout.

When you pumped those flaps down past the take-off setting, a mechanical linkage caused the ailerons to automatically "droop" down alongside them. While this effectively turned the entire trailing edge of the wing into a massive lifting surface, it drastically altered handling. Roll control became heavy, sluggish, and required a lot of muscle—turning a crisp tactical turn into something that felt like steering a submarine through wet concrete.

The Beaver featured three fuel tanks located under the cabin floorboards rather than in the wings. While this made refueling at a remote forward operating base incredibly easy, it introduced a notorious management quirk. Because of the plumbing, the engine's fuel-return line fed exclusively back into the front belly tank. If an unsuspecting pilot flew on the front tank first to lighten the load, and then switched to the center or rear tanks, the returning fuel could overflow the front tank, venting precious gas right out onto the belly of the aircraft. Standard operating procedure? Always burn from the back tanks first.

The Pratt & Whitney R-985 Wasp Junior radial engine didn't just burn oil; it treated it as a design feature. Army crew chiefs spent countless hours cleaning the engine's oil screen, which was notorious for catching carbon flakes. Furthermore, the Beaver's oil tank was located inside the cabin fire wall, meaning the cockpit constantly smelled like a blend of warm aviation grease and hydraulic fluid—the official perfume of Army Aviation in the 1950s and 60s.

Whether hauling cargo in Korea, dropping supplies to remote outposts, or operating out of muddy fields, the Beaver earned its stripes. It was loud, oily, shook your fillings loose, and flew at exactly one speed (slow)—but it got the troops home every single time.

Did you turn wrenches on the Wasp Junior or log stick time in an Army L-20/U-6? What was your favorite "undocumented feature" of the Beaver? Drop your stories in the comments below!

Mission: Find Dad the perfect gift! 🚁

Gear up for Father's Day at the Army Aviation Museum Gift Shop.

Show this post to our team at checkout for 10% OFF your entire purchase!

Come see us in person:

🕒 Tue-Fri: 10:00 AM – 4:00 PM

🕒 Sat: 10:00 AM – 2:45 PM

(In-person only. One-time use per customer. Valid from June 10th to June 20th 2026)