The engine was fueled by a hypergolic mixture of nitric acid and '' Optolin '' ( a mixture of aromatic amines , gasoline , Visol , and catechol ) pressure - fed into the combustion chamber .
The engine was fueled by a pressure - fed hypergolic mixture of nitric acid and '' Optolin '' . 
 Taifun was powered by a hypergolic mixture pressure - fed into the combustion chamber .