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Reducing drag

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ElleryWeld(at)aol.com
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Posted: Fri Jan 19, 2007 5:22 am Post subject: Reducing drag

Visualize this then, but I am not the only one that has done something  like this to reduce drag

 

 Ellery 

 do not archive

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Fri Jan 19, 2007 7:03 am Post subject: Reducing drag

| Visualize this then, but I am not the only one that has done 

something  like

| this to reduce drag

|

| Ellery



Hi Ellery:



Built the mkIII in 1991 with fabric V tail on fuselage.  Lasted less 

than 100 hours before prop pulses beat it to pieces.  Showed the 

problem to Ray Stitts at Sun and Fun 1993.  He said the only solution 

would be to put fiberglass insulation in the V to soak up pulses and 

prevent drumming of the fabric.  Other option was replace with sheet 

metal, which I did.  Used .020 alum.  Works great.



We had a V tail on the Firestar, but the 40 hourse 447 did not cause 

any damage.



john h

mkIII

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Fri Jan 19, 2007 7:20 am Post subject: Reducing drag

The Polytone along the diagonal fuselage side brace on the passenger 

side of the MKIII had cracked as far as 18" ahead of the prop on mine



Richard Pike

Richard:



I foresaw the rear longerons and prop pulse problem when I covered my 

mkIII.  I used reinforcing tape and fabric stitching to keep the 

fabric from drumming in that area.  That fabric has nearly 2,600 hours 

on it.



john h

mkIII

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

jbhart(at)onlyinternet.ne
Guest

Posted: Fri Jan 19, 2007 7:37 am Post subject: Reducing drag

One way to support the fabric is to use a foam form as shown in:



http://www.thirdshift.com/jack/firefly/firefly93.html



So far, this fairing has withstood 122 hours of propeller thumping.



Jack B. Hart FF004

Winchester, IN

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ElleryWeld(at)aol.com
Guest

Posted: Fri Jan 19, 2007 10:46 am Post subject: Reducing drag

Richard

  I have some where around 300 hours on this and no problems  with it so far but I did use Heavy fabric on that area 

 

 Ellery 

 do not archive  [quote][b]

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APilot(at)webtv.net
Guest

Posted: Fri Jan 19, 2007 2:00 pm Post subject: Reducing drag

Thanks for the pictures. That is a neat solution and looks good.  I left

my fuselage open in that area on my Mark III Classic.  My thinking was

to get the cockpit air to the prop.  I am probably only getting drag.

Vic in Sacramento

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Fri Jan 19, 2007 2:19 pm Post subject: Reducing drag

This is how we did the Firestar in 1988.



We also placed a belly fabric brace on it same as on my MKIII.  It 

looks better and helps direct and clean up the air a bit to the prop.



john h

mkIII

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

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