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Zenith701 with A65

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dpfisher(at)scottsbluff.n
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Posted: Tue Mar 19, 2013 9:18 pm Post subject: Zenith701 with A65

Hi!



 I'm still building so take this for what it's worth. I acquired an old A65 ground power unit and rebuilt it into an A80 at an Aviation  school (WNCC here in western Nebraska). The conversion wasn't difficult.  The differences in the two engines are called out in the old maintenance manual for the "A" Series engines.  It involved high compression pistons, a larger carb venturi and jet to suit your altitude.  I drilled a one sixteenth inch diameter hole in each rod cap to squirt a bit more oil at the opposite cylinders and changed the valves.  I also balanced the rods and pistons. The A80 gets its higher horsepower primarily by turning at a higher RPM. I think the information from Tony Riley and David Orr is right on target and I expect similar numbers ( my Tennessee prop is 70 inches long with a pitch of 40 inches).



  After much agonizing I decided to go with VGs and no slats and I got permission from Chris Heintz to stretch my wing span by two feet.  My thinking is that the 80 HP Continental will be a bit anemic at my altitude ( 4000 ft and up), so I'll need all the wing area and efficiency I can get. That said, with an empty weight of 600 lbs and about the same wing span as the 0-200 powered CH750, I should be enough lighter than the CH750 to get about the same takeoff and climb performance with my 80 HP engine.  The secret ,I think, is to keep the plane as simple and light as possible.  I'm sure a C85 or a 100 HP Rotax will outperform my A80 but most of my flying will be solo and it should be a cheap reliable engine.



 Good luck and thanks to all for an interesting thread!



 Dave Fisher, 701 with A80



 At 01:01 AM 3/19/2013, you wrote:

 [quote]I have a friend who is looking at buying a scratch built ch-701..

 This aircraft has a A65 Continental engine rated at 65 hp [b]

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cffd(at)pgrb.com
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Posted: Wed Mar 20, 2013 6:45 am Post subject: Zenith701 with A65

Hi Dave,

 I have a Jab 2200 at about 140 pounds in my 701 for a dry weight of 570#. My 701 is very simple and before the SP version.  Getting a dry weight of 600# with longer wings (not much weight there) and an A80 may be hard.

Chuck D. N701TX

  [quote][b]

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rwehba(at)yahoo.com
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Posted: Wed Mar 20, 2013 8:00 am Post subject: Zenith701 with A65

anyone around san antonio tx have a701 will be there middle next month like tto look at one



Sent from my iPhone



On Mar 20, 2013, at 9:45 AM, cffd(at)pgrb.com (cffd(at)pgrb.com) wrote:



[quote]

Hi Dave,

 I have a Jab 2200 at about 140 pounds in my 701 for a dry weight of 570#. My 701 is very simple and before the SP version.  Getting a dry weight of 600# with longer wings (not much weight there) and an A80 may be hard.

Chuck D. N701TX

   	  Quote: 	
		  

	


[b]

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