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Phil White
Joined: 10 Jan 2006
Posts: 45
Location: Downers Grove, IL
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 Posted: Tue Jan 22, 2008 11:37 am Post subject: Cowling split design? |
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Is there a reason all the cowlings I have seen are split as top and
bottom halves? Perhaps for structural or aerodynamic pressure reasons?
On a nosewheel plane, it would seem much easier to deal with cowl
removal if it were split into left and right halves.
Inquiring minds want to know if I should rework my RV-10 cowl.
Phil #40220 w/Mazda 20B - engine work
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RV-10 #40220 in Downers Grove, IL
(airframe done exc. gear fairings) |
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millstees(at)ameritech.ne
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| Posted: Tue Jan 22, 2008 11:49 am Post subject: Cowling split design? |
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Phil:
Take a look at: www.eggenfellneraircraft.com There are lots of shots of
RV-10's with the cowl split vertically. This is the way my -10 will be
done.
We'll have to get together one of these days, and compare lies...I am here
in Naperville...if you remember, I came over and looked at your project a
couple of years ago.
My -10 now has the engine installed, and am doing the wiring.
Regards,
Steve Mills N750SM (reserved)
RV-10 40486 Slow-build Eggenfellner E-6TI
Naperville, Illinois
Finishing kit, engine install
Do Not Archive
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AV8ORJWC
Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"
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| Posted: Tue Jan 22, 2008 12:43 pm Post subject: Cowling split design? |
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Phil - The theory, though currently improperly applied, is that the
upper half (the High Pressure) will flex and distort during flight.
This phenomena is from both ram air into the openings (internally) and
the low pressure over the top (externally). Two might take a greater
strain on the fastening system.
Both the Upper and Lower cowl pieces can be easily released from the
molds that way.
The quality (or lack thereof) is a result of the mold build, the mold
prep, the release agent (Partall), along with the pride of workmanship
"built in". If the two final halves were joined structurally into one
big plug, then separated at the top and bottom, it would make for a most
interesting finished product. Composite ribs installed on the interior
could significantly reduce the perceived flex on either a piano hinge or
a fastener connected left and right half.
This solution you are proposing would be a boone to all three blade
builders. Six of one - half a dozen on the former.
However the placement of the piano hinge pin into a full semi-circle
(Left and Right halves) rather than a quad could be quite challenging.
For the fastener crowd, it could be a no-brainer. Removal of each side
would actually be easier.
John #40600
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