Explorers

Movie (1985)

Starring:
Ethan Hawke (Ben Crandall)
River Phoenix (Wolfgang Müller)
Bobby Fite (Steve Jackson)
Bradley Gregg (Steve Jackson's Gang)
Georg Olden (Steve Jackson's Gang)
Chance Schwass (Steve Jackson's Gang)

Three young boys are inspired to build a homemade spaceship and fly into outer space to encounter aliens.

Bell 206B JetRanger II

Davanna County Sheriff's Dept. helicopter. Registration appears to be N10748, which is false and belongs to a Cessna 150L.