O.S. .55 HZ-H Hyper Ringed Competition Helicopter Engine
[OSM15630]

O.S. .55 HZ-H Hyper Ringed Competition Helicopter Engine
JAMES FARR - Rating: 3 of 5 Stars! Friday, February 18, 2011
A lot of power more power than hyper 50, but bearings don't last very long.
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