Old School Model Works RAVEN Construction Manual page 16

The other 4 magnets are installed
into the top of the fuselage into
P2 which was installed earlier. As
with all magnets, we want these to
attract, not repel, so pay attention
to their direction when attaching
them so the EDF cover will easily
and positively "snap" in place.
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Step 112 - EDF cover (optional)
This is an optional thing, but
makes since to do.
Cut a piece of paper to fit into
the back half of the cover, as
shown here. The thought is to
keep the airflow as smooth as
possible when exiting the EDF,
and give less opportunity for the
air to grab the framework - popping the cover off in flight.
Applying a little glue onto the framework to hold this in place
worked well for the prototypes.
This completes assembly of the Raven airframe.
These next few steps can be done in most any order - up until
it's time to cover.
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Nose Gear assembly.
Everything you need to assemble the nose
gear is in one package. Push the nose gear
wire partially into the block you've already
mounted in the fuselage. Slip the steering arm
in place, then push the nose gear wire all the
way through the block and the arm.
With the nose gear positioned so the steering
arm at a 10-15° angle, tighten the set-screw in
the steering arm just tight enough so it should
make a mark on the nose gear wire. Also, mark
where the wire should be trimmed off, above
the top collar.
Loosen the screw and remove the wire. Grind
a small flat on the nose gear where the screw made a mark, and
trim the excess top wire as needed, then re-attach. Use a touch
of thread-locking compound on the screw to make sure it doesn't
vibrate loose later on down the road (or more to the point - down
the runway).
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Main Gear mounting
Locate the two main gear wires, two plastic landing gear straps and
four of the 2-56 x 3/4" self tapping screws. You'll need to drill two
5/32" holes into the LG blocks of the center section.
Drill these two places.
Then push the main gear into the
wing until it's fully seated in the
slot on the underside of the wing.
Then place the two plastic mounting
straps over the gear wires, as shown
in this photo. Use the four screws to
mount the gear in place.
Page 16
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EDF Installation
As you should know by now,
I designed the Raven around
a readily available 64mm EDF
unit. Obviously, I don't have
the capabilities and resources
to know if every 64mm fan will
fit, but hopefully your's has the
same dimensions - if not, you
might need to sand and/or modify as needed for a good fit.
To mount the EDF is pretty simple. The unit's mounting ears drop
into the cutouts on the top of the Raven. Then you can use the
mounting hardware that came with the EDF to bolt it in place - of
course you're need to drill a couple of holes first.
I cut a small hole in the exhaust sheeting to allow the EDF's wires
to enter the fuselage.
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ESC installation
I chose to install the ESC just above
the wing saddle in our prototypes.
It seemed a good place to keep
the wire length to a minimum and
it had a decent amount airflow
through the fuselage at this point. I
fashioned a simple tray from scrap
wood, supported by the bottom of F4 and the fuselage framing. Also I
added a short "leg" to support the other corner.
Mark and cut
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Servo & Pushrod installation
off excess wire
extending past
Although you can install the servos and control hardware after covering
collar.
your Raven, I find it easier to temporarily mount everything in place
before covering.
Take a bit of time to plan things out, including where you'll mount
the nose gear servo and run the steering pushrod.
When mounting the aileron
servos to the both SHs (in LP2)
you'll need to cut eight 3/4"
lengths of the 3/16" x 3/8"
square basswood scrap. Make
four thicker mounting posts by
laminating two pieces together
then sand the ends flat.
Position your servo on the inside of the hatch so the servo arm
output shaft is centered in the opening.
On the inside of each aileron hatch, glue one post on each side of
the servo as shown in the photo.
Note that the left hatch is a mirror image of the right hatch.
Now fit the servo hatches into position on the bottom of the wing,
running the servo wires through the ribs and out into the wing's
center section.
Using the pre-cut holes as a guide, drill four 1/16" mounting holes
into the basswood mounting rails you installed earlier. Harden the
wood with a bit of thin CA and you can use the supplied 2-56 x
3/4" self tapping screws to secure the hatches in place.
Finish the layout of your radio gear by adding the receiver and nose
gear servo. We mounted the receiver to the side of the fuselage by
using a bit of self-adhesive hook-and-loop (not included).
I chose to mount the nose gear servo inside the battery compartment,
on the side of the fuse, running the pushrod along the side of the
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