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801 with VGs and no slats!!!

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keystone(at)gci.net
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Posted: Tue Jan 16, 2007 12:54 pm Post subject: 801 with VGs and no slats!!!

I finally got a chance to try my 801 with VGs on  and the slats off.  I was unimpressed.  I was light with 40 gallons  fuel, one 240 lb pilot and 30 lbs of baggage.  

  

 I made the VGs out of 1/2"x1/2"x 1/16" angle cut in  1" lengths with the front cut at at 45 degree angle.  I set them at 4"  apart for the inboard 9' and at 2" apart for the outboard 3'.  I  set them at a 45 degree angle to the leading edge and they are 10% of the chord  back from the leading edge. 

  

 The 801 will stall without slats.  The clean  stall was at 55 mph and the dirty stall was at 43.  With  slats it does not stall.  I use 43 clean and 35  dirty.  

  

 I showed a 4 mph increase in cruise  speed.  It went from 103 mph  to 107 mph at 4000' density  altitude.  This is at 75% power from my O-360 which I define as 10.5 GPH  with normal lean condition.  I was expecting quite a bit more

  

 For you guys that have done this in a 701 do you  have any comments or thoughts?  

  

  

  

 Bill Wilcox

 N801BW

 Valdez, AK

 279 hrs

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vgstol(at)bigpond.net.au
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Posted: Tue Jan 16, 2007 1:52 pm Post subject: 801 with VGs and no slats!!!

Yeh, Bill, I would have expected a fair bit more as  well...

  

 Only real difference I can see is that 45* angle - we use  15*.  Also, we find it better at 8-9% chord for that very full rounded  leading edge.

  

 If you're interested in further experimenting, I'd like to  send you a set of Feathers VGs at no cost.  Just send me your mailing  address and they're away.

  

 JG

 [quote]   ---

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keystone(at)gci.net
Guest

Posted: Tue Jan 16, 2007 2:51 pm Post subject: 801 with VGs and no slats!!!

JG

  

 Thank you for your kind offer!

  

 William Wilcox

 PO Box 3233

 Valdez, Ak 99686

 USA

  

 I will try them at 10 degrees at 8% of the chord  and see if that speeds the plane up.  Maybe 45 degrees is too much.  I  used 45 degrees on the ones I put on the bottom of the elevator and  they helped a lot.  Maybe I should take some angle off them  also.

  

 Bill

  

  

  

  

             Subject:              Re: 801 with VGs and no        slats!!!        From:              JG (vgstol(at)bigpond.net.au ([email]vgstol(at)bigpond.net.au?subject=Re:%20801%20with%20VGs%20and%20no%20slats%21%21%21&replyto=000e01c739b8$58f16810$0100000a(at)OPTIMACFEF5CD5[/email]))        Date:              [b]Tue Jan 16 - 1:52    PM[/b]

 [quote][b][quote]Yeh, Bill, I would have expected a fair bit more as well...  Only real difference I can see is that 45* angle - we use 15*.  Also, we  find it better at 8-9% chord for that very full rounded leading edge.  If you're interested in further experimenting, I'd like to send you a  set of Feathers VGs at no cost.  Just send me your mailing address and  they're away.  JG   ---

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