33
point straight ahead with the nose gear strut pointing straight
ahead (use the steering arm on the nose gear as a reference).
Thoroughly tighten the SHCS in the axle.
❏
22. Remove the axle from the nose gear strut. A mark will
be left on the strut from tightening the SHCS in the previous
step. Grind a fl at spot at the mark. Reinstall the axle onto the
strut and tighten the SHCS against the fl at spot with thread
locking compound.
OPTIONAL TUNED PIPE INSTALLATION
If using the recommended engine and tuned pipe components,
the tuned pipe system will need to be tuned for the engine
before installation is complete. Detailed directions for tuning
the header length can be found at www.macspro.com.
❏
1. Prepare your pipe by installing the pressure nipple as
described in the directions with the system (if no instructions
are included for installing the nipple, visit the website of the
tuned pipe manufacturer). Mount the header to the engine,
join the pipe to the header with a silicone coupler and use
tie-straps to secure it (if you have not yet tuned the system,
do not install the tie straps on the coupler yet). Because the
pipe is mounted directly to the wing, we chose to use an
in-line connector (DUBC2371) on the pressure line to make
disconnecting the line easier. When the wing is removed, you
can leave the pipe attached and simply slide the pipe out of
the coupler and disconnect the pressure line. Another option
is keep a supply of tie-straps in your fi eld box and replace
the strap holding the pipe to the wing whenever you wish to
remove the wing from the fuselage.
❏
2. With the pipe now connected to the header, locate the
plywood plate installed in the wing. If you cannot see it, look
across the underside of the wing at a shallow angle to locate
the edges of the plate beneath the covering.
❏
3. Mark the desired location of the pipe mount onto the
wing, being sure it is on the plywood plate. Also, be sure the
position of the mount will not cause the tuned pipe to interfere
with the removal of the wing bolts.
❏
4. Drill a hole of the appropriate size for the screw included
with the pipe mount (7/64" [2.8mm] recommended for the
screw included with the Macs tuned pipe mount). Thread the
