In Calvert Vaux Park, “crash” is a four-letter word.

“That’s the big C word: 'Crash,'" said David Yuen, who has been flying model aircraft for 50 years.

He thinks the key to a successful flight is always thinking two steps ahead.

“You have to stay focused 100% of the time," Yuen said.

Yuen is the President of the Seaview Rotary Wings Helicopter Club. Calvert Vaux Park in Gravesend, Brooklyn is a recreational space where he and other SRW members can have fun, blow off steam and hone their skills.

“My style of flying is called sport flying. Big sky, big loops," Yuen said.

In a space that can fit 64 football fields, Calvert Vaux feels limitless for Yuen and other SRW members who started practicing here in 2002.

Calvert Vaux is one of only five parks in the entire city where flying is allowed due to the city’s strict drone and model aircraft laws.

Most of the city is off limits because of the close proximity to airports.

“We are blessed," Yuen said. "I can’t tell you how grateful we are working with the Parks Department to secure this space for flying.”

When the Verrazzano Bridge was built in 1959, Calvert Vaux Park became a landfill. In 2000, the Parks Department made it a recreational field and SRW secured it as a hobby field to fly planes and drones. Club members cleaned it up and now, they maintain it.

"It used to be a dump," said Eaton Bryce, a member of SRW. "People used to dump cars, garbage back here and they said, "take it or leave it.' So we formulated a plan to make it what it is today."

Bryce has been flying model planes since he was a five-year-old. The Flatbush native used to take his hobby to Floyd Bennett Field in Marine Park, which is another of the five spaces model aircraft flying is permitted.

“I would get up and go to the park in the morning before everybody started doing laps and playing basketball and I would learn," Bryce said.

And that dedication paid off. He competes against others, is sponsored and makes a living doing it now.

“I’m 53 years old now and I’m still playing with toys. I’m living my best life," Bryce said.

That feeling is shared by Yuen, who says there's no better place to fly than Calvert Vaux.

“We’ve got end-to-end greenery. We’ve got [an] ocean view. We’ve got the bridge view. It’s fantastic for us," Yuen said.