Friday 18 July 2014

Rihn DR 107 One Design ZK-XSG

Another interesting one-off type to be registered at Blenhiem is the specialised aerobatic Rihn DR 107 One Design ZK-XSG.

The Rihn DR 107 One Design was designed by Dan Rihn of California, who is a very experienced designer of aerobatic planes (mostly biplanes).  The design came about in 1992 as a (relatively) low cost aerobatic aircraft for aerobatic competitions, and the International Aerobatic Club has created a special competition class for the (one) design.  The idea is that all competing aircraft would be essentially the same so that the best pilot (on the day) would become the winner.  The prototype first flew in August 1993 and by 2013 there were around 50 aircraft registered world-wide.  The airframe is mainly of wooden construction with dope and fabric covering, and it is designed to withstand plus and minus 10G.  The wing is a symmetrical Wainfan airfoil with nearly full span ailerons which give a spectacular roll rate of 360 degrees per second.  It is supplied as a kit from Aircraft Spruce and Specialty Company of Corona, CA.

It is a small plane with a length of 17 feet (5.18 metres), a wingspan of 19 feet 6 inches and a wing area of 75.5 square feet (The Pitts S 1 has a wing area of 98 square feet).  Empty weight is 740 pound (336 Kg) and MAUW is 1,155 pounds (522 Kg).  With a 150 HP O-320 engine fitted the maximum level speed is 185 MPH and the rate of climb is 2,000 feet per minute.

ZK-XSG (c/n 940141) was registered to the One Design Partnership of Blenhiem on 28/1/14.  Thanks to JEM Aviation of Omaka who supplied the photo.  It looks really smart.  I understand that it is currently undergoing its test flying schedule.

I hope that other One Designs will appear so that they can have a competition!

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