Mailing List flyrotary@lancaironline.net Message #11003
From: Russell Duffy <13brv3@bellsouth.net>
Subject: RE: [FlyRotary] Re: foam-sicle (new ducts)
Date: Wed, 1 Sep 2004 18:23:35 -0500
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message
Very good job Rusty. I hope you are using Rutan Bid glass cloth for the glassing.
Bulent
  
 
If that's what West Marine sells, I'm using it :-)  
 
I just looked up the description of "bid" on the Spruce page, and can't say that I can see any difference between that, and normal cloth (e-glass?).  I cut the cloth on a 45, and usually have pretty good luck going around corners, but I'm sure "bid" is probably better, and certainly my technique could stand some improvement.  I'm using the lightest cloth I could find, at 6 oz, but wish it was a little lighter for the initial layers.  
 
Since there are two ducts, you can surmise that I decided not to add another scoop to the cowl.  I'm going to have one as an air box on the TB, with the air horns inside.  The other goes on the bottom of the right radiator, where the old hoses attached.  By the time I'm done, there will be about a 12 sq in opening in the radiator duct where the new inlet duct will be added.  The two new ducts will be joined by 3" ID tubing,  CEET for now, perhaps something smooth walled later.  3" is just HUGE though, so it's hard to imagine there will be any restriction now.  I may not get quite as much ram air effect as I could with a dedicated scoop, but this system give me the option of adding a scoop in a convenient location later, while still using the air box that I'm making.   
 
Cheers,
Rusty (Frances turn North now) 
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