The helicopter was tested in 1968. No series production.

http://sad-rascko.livejournal.com/192393.html

*     *     *

Technical data for DH-20 Engine: 2 x AiResearch GTP-30-100 turboshafts, rotor diameter: 4.88m, take-off weight: 500kg, max speed: 135km/h, range: 180km

Warning: mysqli_connect(): php_network_getaddresses: getaddrinfo for mysql5.zone.ee failed: Name or service not known in /data03/virt15346/domeenid/www.aviastar.org/htdocs/helicopters_eng/delmar_dh-20.php on line 66

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for mysql5.zone.ee failed: Name or service not known in /data03/virt15346/domeenid/www.aviastar.org/htdocs/helicopters_eng/delmar_dh-20.php:66 Stack trace: #0 /data03/virt15346/domeenid/www.aviastar.org/htdocs/helicopters_eng/delmar_dh-20.php(66): mysqli_connect('mysql5.zone.ee', 'd14657sa18989', Object(SensitiveParameterValue)) #1 {main} thrown in /data03/virt15346/domeenid/www.aviastar.org/htdocs/helicopters_eng/delmar_dh-20.php on line 66