Website visitor Lieven M. requested
that this article on the Blohm Voss 141-B (BV 141-B) be scanned and posted
from the August 1970 edition of American Aircraft Modeler. The BV 141-B,
designed by Mr. Terry Aldrich, is a unique scale subject in that it is a World War II
German fighter-bomber featuring an asymmetrical configuration. Construction uses sheet
balsa for the wings, tail surfaces, and profile fuselage. Power is provided by a single
Blohm Voss 141-B
By Terry Aldrich
Fine-flying asymmetrical German fighter makes
great 049-powered trainer and sport model.
Author used the new McCoy-Testors 049. Rewind-starter-equipped,
it comes with the tank-mount. Engine mounting method is unique and suitable for any profile
Out of WW II came a great variety of experimental aircraft. The BV 141B represents
what was obviously one of Germany's farther out excursions into new design. The brainchild
of Dr. Vogt, the asymmetrical aircraft went beyond the experimental stages and actually
saw combat service on the Russian front.
Built in 1938, this fighter-bomber carried light armament by today's standards. Two
fixed machine guns were supplemented by two movable, crew-manned machine guns, bomb load
was four 110-lb. bombs. The crew pod carried four men including the pilot, while the
main fuselage contained the 1600-hp BMW 801 engine. Statistics, converted from metric
dimensions, were: wingspan, 57.3 ft.; length, 45.8 ft.; speed, 241 mph at an altitude
of 11,500 ft.
The semi-scale 049-powered model is of simple balsa construction. The scale chosen
resulted in a fairly large, stable, easy-to-fly model. One of the new McCoy 049's with
the tank-mount combination was used, but any engine of similar displacement and mounting
Epoxy resin (you can use your favorite cement or glue) was used to join all assemblies
for durability. There are few joints. Make them all close-fitting, using the epoxy sparingly
for maximum strength and lightness.
Wing: Trace the wing outline from the top view onto the soft-balsa wing material and
cut out the wing. Cut the 1/4 x 1/4" groove for the landing-gear mount into the bottom
surface of the wing panel. This can be done on a table saw, or by cutting along the two
outside lines with a modeler's knife and chiseling out the remaining center wood.
Completely carve and shape the airfoil before cutting off the wings to add the dihedral.
Using a razor plane or long knife, roughly shape the upper wing to the airfoil section
shown on the side view. Starting with coarse garnet paper and using progressively finer
paper, sand the wing airfoil to its final shape. Round off the wing tips. When the airfoil
is complete, cut off the outer wing panels at the dihedral parting lines shown on the
reassemble the wing, place the center panel on a flat surface and add weights to hold
it in place. Set the outer wing panels in place and block them up to 1" dihedral at the
tips. Carve, sand and fit the joint surfaces to the proper angle to eliminate all cracks
at the dihedral joint. Epoxy the outer panels into place.
Make only the two upper bends in each landing-gear wire. Drill a 3/32" hole through
each end of the hardwood landing-gear mount at the locations shown on the plan. For each
gear wire, slide the longer leg into place on the mount, then mark the exact location
for the second hole. Drill two more holes for the shorter wire ends and slip the gear
into place. Make the final wire bends at the end where the wheels will slip on. The hardwood
mounts with the wires in place now can be epoxied into the wing slot.
Fuselage and Pod: Trace the outlines onto the 1/4" balsa and cut out. Sand completely,
rounding off all edges, except the area where the stabilizer will sit. Cut out the notch
for the hardwood tail-wheel mount. Tack glue the hardwood into place and round it off
to the fuselage contour. Cut the hardwood loose again and fit the tail-wheel wire into
it. Bend and fit the wire in the same manner as the main gear. Epoxy the wire and hardwood
Next make the fuselage cutout for the wing. Cut out the rectangular section which
runs along the very bottom of the wings and straight down from the leading and trailing
edges, as marked on the plan. Then carve the upper airfoil shape into the fuselage, slipping
the wing into place frequently to check progress. When the wing and the rectangular fuselage
section fit properly, epoxy them into place, keeping everything squarely aligned. Fit
the pod onto the wing in the same manner.
Make and install the engine mount and brace. The engine mounting holes can be drilled
much more easily before the mount is epoxied to the fuselage.
Empennage: Cut out the fin, rudder, stabilizer and elevator parts. Sand to a symmetrical,
streamlined shape. Select a control horn with 1/2" center to hole spacing, and mount
it on the elevator. Attach the elevator to the stabilizer using figure-eight carpet-thread
hinges, or other preferred method. Epoxy fin and rudder into place, with at least 1/4"
offset as shown. At this point make the plywood line guide and install it on the lower
surface of the wing.
Finish: The wing and pod fillets were made of epoxy putty, although a lighter, faster-working
material, such as plastic balsa could be used. The model pictured had three brushed-on
coats of sanding sealer, rubbed generously with fine sandpaper between each coat. The
sprayer was used after this, beginning with three coats of clear dope. The swastika and
crosses were made by masking and painting, but perhaps could be added more easily afterwards
by making cutouts from decal material.
The pod windows were made by painting the entire area white, then covering the white
with masking tape while the other colors were added. Later the tape was stripped off
and small black plastic tape ribbons used for the window pane dividers.
Three coats of the basic sky-blue color were sprayed on after the clear dope. Then
a single coat of dark blue was applied in a camouflage pattern on the upper surfaces.
At this point any masking is removed and three coats of clear sprayed on. When thoroughly
dry, apply rubbing compound, then spray a final coat of clear dope, unrubbed for maximum
The two tones of blue on the original can be mixed using Corsair blue as the darker
color, adding white to obtain the lighter blue for the base color.
Controls and Final Assembly: Bend the 1/16" wire pushrod to shape and install it at
the same time the bellcrank is installed. Make a pushrod guide either from small wire
or by clipping the head off a large safety pin and sliding the pushrod through the eye.
Select a bellcrank with a 2" line spacing and install it below the wing, using epoxy
on the bolts and nuts. Let the pushrod guide hang loosely until each pushrod end is installed,
then install the guide into the fuselage, midway between bellcrank and elevator horn.
Add approximately 3/4-oz. outboard wing weight. Use very light (.010 dia.) wire lead-outs.
Install wheels and wheel skirts. Veco wheels were used on the model shown. Mount the
engine and tank. Standard 1/2A dacron flight lines are used. For best model durability,
fly with care and precision, avoiding all unnecessary contact with the ground.
1/2 x 6 x 36", soft balsa, wing; 1/4 x 3 x 36", soft balsa, fuselage, pod; 1/8 x 3
x 24", soft balsa, stab, rudder; 1/4 x 1/4 x 10", hardwood, LG mount; 1/4 x 1 1/2 X 2
1/2", plywood, engine mount; 1/8 x 3 x 4", plywood, line guide, braces; 3/32" dia. wire,
landing gear; 1/16" dia. wire, pushrod; .020 x 3 x 5" aluminum, wheel skirts (optional).
Hardware items, such as wheels, controls, engine, and finishing materials, are not
included in the materials list, but are shown on the plans or described.
The AMA Plans Service offers a full-size
version of many of the plans show here at a very reasonable cost. They will scale the plans any size for you. It is always
best to buy printed plans because my scanner versions often have distortions that can cause parts to fit poorly. Purchasing
plans also help to support the operation of the Academy of Model
Aeronautics - the #1 advocate for model aviation throughout the world. If the AMA no longer has this plan on file, I
will be glad to send you my higher resolution version.
Try my Scale Calculator for Model Airplane Plans.
Posted April 3, 2013