Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Tuned pipe & air flow question

Reply

Old 03-11-2006, 09:33 AM
  #1  
vasek
Thread Starter
My Feedback: (4)
 
vasek's Avatar
 
Join Date: Jan 2002
Location: Prague, CZECH REPUBLIC
Posts: 4,144
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Tuned pipe & air flow question

Hi all,

I am wondering about fast planes having a tuned pipe change the airflow over one wing. Does it have any effect on the lift of the wing in question?

if yes, what would be the optimal place to minimize the effect? (distance from wing & fuse ?)

any good info on that?

thanks,

Vasek
Attached Thumbnails Click image for larger version

Name:	Ca80484.jpg
Views:	12
Size:	76.2 KB
ID:	424096   Click image for larger version

Name:	Je11198.jpg
Views:	13
Size:	85.5 KB
ID:	424097  
vasek is offline  
Reply With Quote
Old 03-25-2006, 02:57 PM
  #2  
BMatthews
 
BMatthews's Avatar
 
Join Date: Oct 2002
Location: Chilliwack, BC, CANADA
Posts: 12,338
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Tuned pipe & air flow question

Moved to Extreme Speed Props forum for the best answer.
BMatthews is offline  
Reply With Quote
Old 03-25-2006, 03:44 PM
  #3  
setxws6
 
setxws6's Avatar
 
Join Date: Oct 2005
Location: Lumberton, TX
Posts: 304
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Tuned pipe & air flow question

I think it would have very little effect as far as wing lift. It probably affects cg balance more than anything.
setxws6 is offline  
Reply With Quote
Old 03-25-2006, 08:40 PM
  #4  
bob27s
My Feedback: (19)
 
bob27s's Avatar
 
Join Date: Apr 2002
Location: Cleveland, OH
Posts: 5,576
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Tuned pipe & air flow question

there may be a small interactive effect at lower speeds.

But the effect will be inboard on the wing, near the wing/fuse interface which is sorta cruddy air anyway. Dont worry about it.
bob27s is offline  
Reply With Quote
Old 03-26-2006, 01:53 AM
  #5  
vasek
Thread Starter
My Feedback: (4)
 
vasek's Avatar
 
Join Date: Jan 2002
Location: Prague, CZECH REPUBLIC
Posts: 4,144
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Tuned pipe & air flow question

thanks guys,

SET, you may be right about the lateral balance:

SHOULD one try to counter-balance the pipe weight?
vasek is offline  
Reply With Quote
Old 03-26-2006, 07:02 AM
  #6  
burgh_guy61
Senior Member
My Feedback: (11)
 
Join Date: Jul 2005
Location: Trafford, PA
Posts: 252
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Tuned pipe & air flow question

I think this was talked about once in the classic pattern forum. I seem to remember that there was no airfoil problems, but the exhaust was causing turbulence over the stab and this is where some of the 70's pattern planes used anhedral in the stab to get out of that dirty air caused buy pipes. As a side note i always lateral balance a plane, pipe or no pipe.
burgh_guy61 is offline  
Reply With Quote
Old 03-26-2006, 03:16 PM
  #7  
flyingmachine
Senior Member
My Feedback: (9)
 
Join Date: Feb 2005
Location: Coral Springs, FL
Posts: 191
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Tuned pipe & air flow question

always balance the plane laterally

flyingmachine is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service