Top Flite TOPA0160 - Manual (Page 45)

MOUNT THE ENGINE
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1. Glue the die-cut 1/8” [3.2mm] plywood servo
tray doublers to the bottom of both die-cut 1/8”
[3.2mm] plywood forward servo trays. Mount your
throttle servo to one tray and your nose wheel
steering servo to the other tray using the screws,
grommets and eyelets that came with the servos.
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2. Cut an 8-1/2” [215.9mm] forward servo rail
from a 1/4” x 3/8” x 36” [6.4 x 9.6 x 914mm]
basswood stick to fit between the fuselage sides
behind former F2. Test fit, then glue the servo rail to
the fuse sides and former F2 1-7/8” [47.6mm] below
the top edge of F2.
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3. Cut a 8-3/4” [222.3mm] aft servo rail to fit
between the fuselage side doublers 7/8” [22.3mm]
aft of the forward servo rail. Place the throttle and
nose wheel steering servos and trays between the
rails. Adjust the position of the aft rail to fit your
servos. Glue the aft servo rail in place. Do not glue
the servo trays in place until instructed to do so.
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4. Glue the F1T/F1DT assembly to the top of the
firewall. Use a straightedge to make sure they align.
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5. Glue the die-cut 1/8” x 4” x 4” [3.2 x 101.6 x
101.6mm] plywood firewall doubler to the back of
the firewall, centered on the engine mount punch
marks, 1/8” [3.2mm] below the notch in the center of
F1DT as shown on the plan.
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6. Drill the correct size holes through the punch
marks on the front of the firewall as shown in the
sketches above. Tightly hold a thick block of wood
on the back so the drill does not split the wood when
it comes through.
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7. Press four 8-32 blind nuts into the 7/32” [5.6mm]
holes on the back of the firewall. Use an 8-32 x 1-1/2”
[[38.1mm] socket head cap screw with some large
washers to
draw the blind nuts into the wood. Wick
thin CA around the back of the blind nuts to
permanently hold them in place.
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8. Temporarily clamp the die-cut 1/8” [3.2mm]
plywood tank floor to the forward servo rail so it is
centered on the back of the firewall doubler. Turn the
fuselage over and push the tank floor up until it
contacts the edge of the bottom blind nuts. Glue a
3/16” x 3/16” x 3” [4.8 x 4.8 x 76.2mm] balsa stick to
the back of the firewall under the tank floor to serve
as a forward tank floor ledge. Do not glue the tank
floor to the ledge until instructed to do so.
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9. If you have not already done so, sand the
fuselage side doublers and fuselage sides so they
are flush with the front of the firewall.
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10. Cut the spacer bar off both engine mount
halves and trim off any flashing so they easily fit
together. Loosely bolt your engine mount to the
firewall with four 8-32 x 1-1/4” [31.8mm] socket head
cap screws, #8 lock washers and #8 flat washers.
Adjust the mount so your engine will fit. Tighten the
screws to securely hold the mount to the firewall. Use
small clamps to hold your engine to the mount so the
front of the drive washer (or the back plate of your
spinner) is 6-1/4” [158.8mm] from the firewall. Mount
a flat wood stick or the back plate of your spinner to
the engine so you can measure the distance.
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