KiloPapa
Joined: 24 May 2006
Posts: 142
Location: Pearblossom, CA
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 Posted: Tue Mar 13, 2007 9:51 am Post subject: Rolling the Rudder skins leading edge - Building Note |
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For the Archives:
Rolling the Rudder skins leading edge - Section 7-11
I have collected various builder's techniques/tips on rolling the Rudder skin leading
edge and found what worked best for us was a combination of some of them.
We found that the upper and mid skin sections being narrower in protruding length
and Rudder width were better suited to rolling with 1" OD pipe. This produced a
radius in which the rivet holes lined up well. When first trying to use the 1-1/4" OD
pipe on the upper section we found that we ran out of turn - the pipe bumped into the
spar - before the appropriate radius was produced. Using 1" on the mid section led
to a slightly too tight radius on the bottom half of the mid section so the caution here
is to bend and then check to find a compromise. This tighter than needed radius on
the bottom half of the mid section was easy enough to reduce by hand. The lower
section worked best when rolled with the 1-1/4" OD pipe as listed in the builders
manual section 7-11 producing the bend with an appropriate radius and skin lap for
the wider length and width of the skin at the bottom of the rudder.
We also found duct tape worked OK and this is definitely a two-man job. One person
with good arm strength needs to hold the pipe (taped to the skin) flat on the bench to
keep the bend from occurring at the skin/spar rivet line but rather produce a nice
smooth radius. The other person rolls the pipe with a pipe wrench. A fair amount of
leverage is required on the lower sections. I think the mass of the pipe is an advantage
over using a wood dowel.
Also, don't forget to put the bend in the skin edge for smooth overlap before rolling the skins.
Kevin
40494
tail/empennage
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