Rotec Engineering was an American aircraft manufacturer, founded in 1977 by William Adaska and located in Duncanville, Texas.
[1][2][3] Rotec Engineering specialized in the design and manufacture of ultralight aircraft in the form of kits for amateur construction and ready-to-fly aircraft under the US FAR 103 Ultralight Vehicles rules.
[1][2][3] The company's most successful line was the Rotec Rally that was designed by Adaska as a motor glider in 1977 and praised by reviewers for its sound engineering and low price.
The Rally line established the company one of the most successful ultralight manufacturing concerns of that period.
[1][2][3] The follow-on Rotec Panther was initially aimed at the US Experimental - Amateur-built category, but later lightened by installing a smaller cockpit fairing to give it an empty weight of 250 lb (113 kg), allowing it to be flown as a US FAR 103 ultralight.