Information from Aerofiles.com
two 145hp Continental O-300 mounted in tandem driving two counter-rotating props; span: 35'9" length: 28'4" v: 170/150/55 range: 800. Max Harlow, design based on his Harlow PJC-2. All-metal construction. $2,995 in 1939; POP: 1 [N37463]. Flight record unknown, but plane was soon converted to a single 215hp Harlow-modified Franklin 6AB, and was active into the 1990s with a 400hp Lycoming IO-720.
The following photos of the H-10 with the two O-300s driving two counter-rotating props are from the collection of Nick Williams.
