It is a development of the Sling 2 to accommodate four people without sacrificing the sporty feel of its predecessor. The aircraft's turbocharged Rotax 914 or 915iS engine boosts its cruise speed ...

The aircraft, as the name suggests ... exhaust to muffle the sound that comes out of the engine to the maximum extent we can.” The Whisper Sling also features a custom-made, quieter propeller ...