As I recall, the black RTV silicone is
good to about 400F, and the red stuff up to about 500 F.
Al
-----Original Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Terry L Schubert
Sent: Thursday, March 25, 2004
6:05 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: cooling
duct seal?
A lighter weight less messy method is to impregnate
BID with RTV. Buy it in caulking tubes for less cost and easier handling.
Lay out the size and shape piece you need on Saran
Wrap. squeegee on 1/8" RTV and lay down the ply of BID. Add
some RTV on top and cover with another piece of Saran. Get something
round and hard like a deep well socket or rolling pin and work the RTV into the
BID.
Peel off one side of the Saran and apply the RTV/BID
RTV sandwich to the desired spot. It will cure in about 24 hours IF you
remove one side of the Saran. It has to have air to cure.
Have fun. It is great material but doesn't hold
well under AV-Gas soaking.!
Terry Schubert
Central States Association
Newsletter Editor
If you want to get
creative, fiberglass mat saturated with RTV makes quite a flexible - in all
aspects of the term - sealant. I've used it on oddball shaped gaps, others use
it successfully as baffling directly on their Lycoming cylinders. You can put
some duct tape where on the cowling inlet where you don't want the stuff to
stick and perhaps build it up stiff enough to stay put or set up a removable
frame adhering to the glass-RTV that clips/bolts etc to the cowl.
-----Original
Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]On Behalf
Of Russell Duffy
Sent: Wednesday, March 24, 2004
7:11 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] cooling duct
seal?
I did the first test fit of my
cooling ducts, and there's hope for them. I still haven't decided exactly
what I'm going to do to seal the front of the duct to the cowl inlet.
There's only about 1/8" gap at most, and I'm thinking that it will
probably work fine without any additional seal, however, I'll probably try to
put some sort of foam strip to get some sort of a seal.
I looked through all the pics I
have, and can't find a picture that shows the front of anyone's duct. How
are you guys sealing these to the cowls? Pictures???