4850
They produced 4,200 " hp from a pair of Thornycroft water-tube boilers , giving them a top speed of 27 knots , giving the range and speed to travel effectively with a battle fleet .
 Thornycroft
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Thornycroft