33
Best to make a simple jig from scrap with 1/16” (1.6 mm) holes, 1.74” apart.
Glue on Tip Ribs (LW2)
and add trailing edge (LS1), cut from .016” (.4mm) wire.
Insert the axel in the spar and glue on the spacers (LM2), which keep the axel from sliding out
of the spar. Add spacer LM6 and loop bungee over the suspension posts and axel as shown in
Figure 4.2. Loop around twice and glue ends together
.
Figure 4.2 Bungee
Add the wheels and be sure they spin free, then epoxy on the nut (LC3). Fit the assembly to the
fuselage, but DO NOT GLUE IT ON YET.
Stage 5: Building the Oberursel Engine and Propeller
Dr.1s were powered by a number of engines, all derived from the French Le Rh
őne 9-cylinder,
110hp rotary. The majority of the Dr.1s were fitted with a virtual copy of the Le Rh
őne which was
manufactured by Oberursel and called, the UR.II, the engine modeled in this kit.
Part #
Name
Count
Material
EC1
Crankcase front
1
Cast Britannia
EC2
Crankcase
1
Cast Britannia
EC3
Cylinders with spark
plug
9
Cast Britannia
EC4
Intake manifold
9
Cast Britannia
EC5
Crankcase rear
1
Cast Britannia
EC9
Carburetor
1
Cast Britannia
EC10
Front mount-
accessories
1
Cast Britannia
EC11
Rear mount
1
Cast Britannia
WPGR9-
15
EM1, Main engine shaft
1
5/32 (.156), 4mm dia brass rod, 2.00’
(51mm) long
WP105K
EM2, Main shaft spacer
stock
7/32 x .032 wall .156 ID Aluminum tube
.46” (11.6mm) long
WP127K
EM3, Carb air intake
tubes
stock
1/8 OD .097 ID al tubes, 1.5” (38mm) long
WP162K
EM4,Push rods
stock
1/16 (1.6 mm) brass rod
WP498
EM5, Spark plug wires
stock
.016 wire
A.
The Oberursel Engine
Drawings of the engine are on Sheet E. Before detailing the building instructions, a brief
description of how it worked and was connected to the controls and instrumentation.