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After further testing indicated the 26 to be underpowered , a third propeller was carved to order from yellow birch by Sensenich Propeller and fitted in time for the 26 's second series of flight tests in 1971 .
 Sensenich Propeller
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Sensenich Propeller