Construction Manual
www.oldschoolmodels.com
Page 19
German
Sunday Fighter
Heinschmitt
Also, cooling holes will
need be added into the
fuselage to help cool
your batteries. We’ve
designed in 5 precut
slots on the side of the
fuselage to help with
this. These work along
with the included molded
louvers to help “scoop”
air into the fuselage.
Cut the molded louver
right down the middle with a sharp set of shears. You’ll see a couple of
molded-in marks to help show where to cut.
These pieces can be left clear or painted to match your covering,
then glued in place over the fuselage side cutouts with some
canopy glue, after your covering has been applied.
Covering
Now it is time to cover the Sunday Fighter. Remove the powerplant,
main gear, tailwheel, pushrods, and any other components that
would get in the way of applying the covering.
Double check that all surfaces are smooth and ready to cover. Sand
as necessary, then cover the entire airframe with the covering/finish
of your choice.
Note that if you’re powering with an electric motor, you’ll need
to make a hole for the cooling air to escape the bottom of the
fuselage, near the rear.
When the covering is complete, re-attach all the components you
removed earlier in this step.
Logos, numbers, etc.
If you want to use graphics similar to the ones we used, we highly
recommend Callie Graphics as a supplier for pre-cut vinyl. They
are a very well known provider of custom
graphics for R/C models.
We don’t have a specific graphic set for
the Sunday fighters, as they are using
existing roundels, assuming you want
to use roundels. Our prototypes use
5-1/4” diameter on the wings and 2-1/2”
diameter for the fuselage.
Contact Callie Graphics at this link: https://callie-graphics.com or scan
the QR code.
Note that Callie Graphics is not affiliated with Old School Model
Works, nor does Old School Model Works generate any income
from this partnership.
Attach the Control Surfaces
Now is the time to attach all the control surfaces to the airframe, by
gluing the hinges in position with thin C/A.
Make sure that you attach the elevator first, then the rudder. Also
note that the tailwheel assembly should be in place before the
rudder is attached.
Attach wheels
Use the included 1/8” i.d. wheel collars to hold each wheel (not
included) on the axles. For a maintenance free installation, file
a small flat on the axle where the set screw of the wheel collar
touches. Also use a touch of thread-locking compound to keep the
screw from loosening over time.
Finishing details (optional)
We’ve included a couple of optional pieces to help “dress-up”
your Sunday Fighter.
The first is a profile
pilot. In LP5 is
PF which can be
covered with the
included color
pilot printouts.
You can then
make a “floor” for
him to mount to
using a bit of scrap 3/16” wood sheet.
G1 and G2 are pieces of a profile machine guns located in LP5.
LW1 Glue one G1 to one G2 to make a complete gun. Do the same
for to make the other gun. Paint them to taste and mount them to
just in front of the pilot as shown here - if you’d like.
Lastly is a molded windscreen. This piece is a bit oversized, but it
allows you to be a bit creative and leave as-is, or cut it down to a
more rectangular, smaller, or even narrower shape. Glue in place in
front of the pilot with a bit of canopy glue.
This completes the assembly of the Sunday Fighter. Now
you’ll need to adjust the control throws and check for
balance.
Recommended C.G. setting:
An important part of preparing the aircraft for flight is properly
balancing the model. This is especially important because of the
various motor/battery combinations that can be used.
CAUTION! DO NOT SKIP THIS STEP!
The recommended Center of Gravity
(CG) location for the Sunday Fighter is
measured back 2.3” from the leading
edge of the top wing, and you’ll see this
marked on the fuselage plan with this
symbol.
If necessary, move the battery, receiver,
and/or add weight to either the nose or the tail until the correct
balance is achieved. Stick-on weights are available at your local
hobby store and work well for this purpose.
Recommended Control Throws:
The amount of control throw should be adjusted as closely as
possible using mechanical means, rather than making large
changes electronically at the radio.
By moving the position of the clevis at the control horn toward
the outermost hole, you will decrease the amount of control throw
of the control surface. Moving it toward the control surface will
increase the amount of throw. Moving the pushrod wire at the
servo arm will have the opposite effect: Moving it closer to center
Trim inside
this line.
Cut down this
center line.
