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  #11  
Old 06-08-2009, 12:43 PM
SvingenB SvingenB is offline
 
Join Date: Apr 2007
Location: Norway, Stj?rdal
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Quote:
Originally Posted by flyboy1963 View Post
Even a 1/4 scale chunk of wing bolted to the side mirror would be interesting, no?
You would end up with a very different Re number than the real thing. 1/4 scale at car speed is similar to a 1/4 scale model airplane at model airplane speed. Your 1/4 scale wing would behave very different than that of a full scale at real speed.

Wouldn't it be better just to glue or tape light threads directly on the real wing?
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  #12  
Old 06-08-2009, 08:22 PM
David-aviator David-aviator is offline
 
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Location: Chesterfield, Missouri
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Interesting stuff, Pierre, tracking oil on an air frame to see what's going on with air flow.

A while back I had a few very thin streaks of oil coming up over the windshield and tracking them forward discovered they were coming from inside the cowl via the inlet from a leaking PSRU which meant there was air coming out of the cowl in that area. You'd think the oil would be all over the top of the engine but it wasn't, it was on the windscreen, the engine was dry.

It could be with a fixed cowl inlet, there is a point in the speed plot where internal cowl pressure is such that air can't all go aft, down and out, so pressure builds up and it burbles forward and up and out.

For a few million, maybe we could engineer a variable inlet. I wonder what that lucky family in Winner, SD is doing with the $220 million they won a couple weeks ago?
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  #13  
Old 06-19-2009, 01:50 PM
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az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
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Smile Pierre, I would not describe it as...

Quote:
Originally Posted by pierre smith View Post
....if oil paints would stay wet long enough for a takeoff and flight to WOT.
....
Thanks,
..."oil paint" - I believe it's mainly oil with a bit of food coloring added.

If you want, I can contact the guy who was designing the cowl in question and find the exact formula...
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  #14  
Old 06-19-2009, 02:19 PM
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dhammer dhammer is offline
 
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Location: Keller, TX
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Default My late friend --

Dick Johnson, of glider testing fame, used the old oil he drained out of the VW Diesel he towed his glider trailer around with. Worked great and is already black. No special formula required.

Don
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  #15  
Old 06-19-2009, 02:32 PM
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pierre smith pierre smith is offline
 
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Location: Louisville, Ga
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Default Not that, Gil..

Quote:
Originally Posted by az_gila View Post
..."oil paint" - I believe it's mainly oil with a bit of food coloring added.

If you want, I can contact the guy who was designing the cowl in question and find the exact formula...

Oil paint that artists use to paint paintings of things.

Regards,
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  #16  
Old 06-19-2009, 03:02 PM
rjt194 rjt194 is offline
 
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Location: Lincoln Boro, PA
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Artists oils can take several weeks (or months) to fully dry, so it would stay fluid for a test flight. it's quite thick though, so you will want to thin it (artists use linseed oil, but you can use vegetable oil for this as its cheaper). Don't use acrylic paint by mistake
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