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Streamlined Strut Covers

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rockiedog2

Joined: 03 Mar 2010
Posts: 19

Posted: Mon May 16, 2011 4:42 pm Post subject: Streamlined Strut Covers

>>>Any suggestions other than removing my  slats?  They are staying where they are.



Doug MacDonald

CH-701  from scratch

NW Ontario, Canada

  

 Hi Bob

 The TAS of my plane increased 5 mph from adding the strut  cuffs. The sink decreased and the climb increased also. I did numerous GPS box  patterns under varying conditions over several days and finally averaged all the  numbers for what should be an accurate real world speed. I never have been able  to accurately judge a mod with just one or a few flights.

 I suppose one could actually decrease the speed of his  plane with the addition of the cuffs. Or induce unwanted pitch or roll inputs.  Not to overstate the obvious, but they have to be accurately aligned with the  relative wind and one another for maximum benefit. I guessed at it and decided  to use the top of the fuse for a reference and must have lucked out. I set the  chord of the cuffs parallel with that reference and carefully aligned with one  another(made a fixture for all that). Those cuffs would make fine trim tabs,  able to affect roll and pitch and create considerable drag if not properly  aligned . I didn't get any unwanted trim inputs. Maybe you did all that  already; just food for thought...

 Good luck

 Joe in Mississippi

   [quote][b]

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NYTerminat(at)aol.com
Guest

Posted: Mon May 16, 2011 5:46 pm Post subject: Streamlined Strut Covers

Doug,

 My 701 increased about 4 mph. I agree that the positioning of them is  critical. What did you use to align the strut fairings?

  

 Bob Spudis

 N701ZX  CH701  912S

  

  In a message dated 5/16/2011 8:42:37 P.M. Eastern Daylight Time,  jpspencer(at)cableone.net writes:

  	  Quote: 	
		     >>>Any suggestions other than removing my    slats?  They are staying where they are.



Doug MacDonald

CH-701    from scratch

NW Ontario, Canada

  

   Hi Bob

   The TAS of my plane increased 5 mph from adding the    strut cuffs. The sink decreased and the climb increased also. I did numerous    GPS box patterns under varying conditions over several days and finally    averaged all the numbers for what should be an accurate real world speed. I    never have been able to accurately judge a mod with just one or a few    flights.

   I suppose one could actually decrease the speed of his    plane with the addition of the cuffs. Or induce unwanted pitch or roll inputs.    Not to overstate the obvious, but they have to be accurately aligned with the    relative wind and one another for maximum benefit. I guessed at it and decided    to use the top of the fuse for a reference and must have lucked out. I set the    chord of the cuffs parallel with that reference and carefully aligned with one    another(made a fixture for all that). Those cuffs would make fine trim tabs,    able to affect roll and pitch and create considerable drag if not    properly aligned . I didn't get any unwanted trim inputs. Maybe you did    all that already; just food for thought...

   Good luck

   Joe in Mississippi

 	  Quote: 	
		  



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  [quote][b]

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dougsnash

Joined: 14 Apr 2008
Posts: 281

Posted: Mon May 16, 2011 5:50 pm Post subject: Streamlined Strut Covers

I was careful when aligning my streamlined covers.  Their installation has had no negative effect on the control of the plane. 



I added one degree of pitch today, up to nine, that added about 1 MPH (as near as I can tell in the thermally air we had today).  It reduced my T/O RPM by about 200 RPM to 5200.  That is the minimum full power RPM recommended by Rotax.  My full power, straight and level is now 5600 so I don't need to worry about overspeeding the engine.  I don't know what effect this has had on my climb because of the thermals.



I'm just going to have to accept that this plane is going to be an 80 mph aircraft.  That's fine.  It certainly is not the lightest example of a 701 with an empty weight of 667 lbs.  Maybe I should loose 30  or so lbs and see what that does to my cruise.



Thanks for all of your input guys.



Doug MacDonald

CH-701 from scratch

NW Ontario, Canada

From: Joe Spencer <jpspencer(at)cableone.net>

To: Zenith701801-List(at)matronics.com

Sent: Mon, May 16, 2011 7:39:28 PM

Subject: Streamlined Strut Covers



         >>>Any suggestions other than removing my  slats?  They are staying where they are.



Doug MacDonald

CH-701  from scratch

NW Ontario, Canada

  

 Hi Bob

 The TAS of my plane increased 5 mph from adding the strut  cuffs. The sink decreased and the climb increased also. I did numerous GPS box  patterns under varying conditions over several days and finally averaged all the  numbers for what should be an accurate real world speed. I never have been able  to accurately judge a mod with just one or a few flights.

 I suppose one could actually decrease the speed of his  plane with the addition of the cuffs. Or induce unwanted pitch or roll inputs.  Not to overstate the obvious, but they have to be accurately aligned with the  relative wind and one another for maximum benefit. I guessed at it and decided  to use the top of the fuse for a reference and must have lucked out. I set the  chord of the cuffs parallel with that reference and carefully aligned with one  another(made a fixture for all that). Those cuffs would make fine trim tabs,  able to affect roll and pitch and create considerable drag if not properly  aligned . I didn't get any unwanted trim inputs. Maybe you did all that  already; just food for thought...

 Good luck

 Joe in Mississippi

   [quote]

[b]

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NYTerminat(at)aol.com
Guest

Posted: Mon May 16, 2011 6:05 pm Post subject: Streamlined Strut Covers

Is there any way to change the angle of the strut covers? They may not have  a negative effect but they are not reducing the drag on the round struts. I know  what you mean about loosing weight:) I should also take that advice.

  

 Bob Spudis

  

  In a message dated 5/16/2011 9:50:45 P.M. Eastern Daylight Time,  dougsnash(at)yahoo.com writes:

  	  Quote: 	
		        I was careful when aligning my streamlined covers.  Their    installation has had no negative effect on the control of the plane. 



I    added one degree of pitch today, up to nine, that added about 1 MPH (as near    as I can tell in the thermally air we had today).  It reduced my T/O RPM    by about 200 RPM to 5200.  That is the minimum full power RPM recommended    by Rotax.  My full power, straight and level is now 5600 so I don't need    to worry about overspeeding the engine.  I don't know what effect this    has had on my climb because of the thermals.



I'm just going to have to    accept that this plane is going to be an 80 mph aircraft.  That's    fine.  It certainly is not the lightest example of a 701 with an empty    weight of 667 lbs.  Maybe I should loose 30 or so lbs and see what that    does to my cruise.



Thanks for all of your input guys.



Doug    MacDonald

CH-701 from scratch

NW Ontario, Canada



   

         From: Joe Spencer    <jpspencer(at)cableone.net>

To:    Zenith701801-List(at)matronics.com

Sent: Mon, May 16, 2011 7:39:28    PM

Subject:    Streamlined Strut Covers



       >>>Any suggestions other than removing my    slats?  They are staying where they are.



Doug MacDonald

CH-701    from scratch

NW Ontario, Canada

  

   Hi Bob

   The TAS of my plane increased 5 mph from adding the    strut cuffs. The sink decreased and the climb increased also. I did numerous    GPS box patterns under varying conditions over several days and finally    averaged all the numbers for what should be an accurate real world speed. I    never have been able to accurately judge a mod with just one or a few    flights.

   I suppose one could actually decrease the speed of his    plane with the addition of the cuffs. Or induce unwanted pitch or roll inputs.    Not to overstate the obvious, but they have to be accurately aligned with the    relative wind and one another for maximum benefit. I guessed at it and decided    to use the top of the fuse for a reference and must have lucked out. I set the    chord of the cuffs parallel with that reference and carefully aligned with one    another(made a fixture for all that). Those cuffs would make fine trim tabs,    able to affect roll and pitch and create considerable drag if not    properly aligned . I didn't get any unwanted trim inputs. Maybe you did    all that already; just food for thought...

   Good luck

   Joe in Mississippi

 	  Quote: 	
		  





====================================

List href="http://www.matronics.com/Navigator?Zenith701801-List">http://www.matronics.com/Navigator?Zenith701801-List

====================================

ms.matronics.com/">http://forums.matronics.com

====================================

tp://www.matronics.com/contribution">http://www.matronics.com/contribution

====================================



	
	


  [quote][b]

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