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		professor71(at)HOTMAIL.CO Guest
 
 
 
 
 
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				 Posted: Fri Aug 24, 2007 9:42 am    Post subject: 601HD to HDS | 
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				I've been flying my 601HD-912ul for about 3 years now. It is a great little 
 plane and fun to fly most of the time. However living in the mountains of 
 southwest VA it can be pretty turbulent sometimes. I've been thinking about 
 possibly switching out to HDS wings hoping that the higher wing loading 
 would smooth out some of the bumps. Anyone out there that has made the 
 switch have any pros or cons or would there even be that much difference? 
 I'm guessing the another plus may be about a 10mph increase in cruise speed.
 Thanks in advance
 John
 
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		daveaustin2(at)primus.ca Guest
 
 
 
 
 
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				 Posted: Fri Aug 24, 2007 10:12 am    Post subject: 601HD to HDS | 
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				John,
 I replaced my HD wings with HDS some years ago.  You are right on both 
 counts - extra cruise speed and significantly less bumpy.  But, in very hot 
 moist air and 80 hp Rotax, with two 200 lbs people on board it barely "gets 
 up on the step".  I can cruise 120 mph with one up, but with two I'm down to 
 110 to 112 mph.  With the HD wings I cruised at 95 mph with two up.
 Recently added VGs by John Gilpin.  Dropped the stall and landing speeds 
 back to where they were with the HDs with no loss of cruise speed.
 
 Dave Austin  601HDS - 912, Spitfire Mk VIII
 
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