Yes, you are seeing spots.
This yellow Speckled-P- 30 from
BMJR Models placed first at the
2013 King Orange International
The bones of the author’s Dime Scale Yak- 7
aircraft illustrate four building tips.
Bill Schmidt’s Thermal Bagger, resplendent in Sanford Permanent Marker orange, is an easy build
and flies well.
The One-Design Rubber model for this year’s Free Flight (FF) Nats is actually three P-30s with
one designer. George Perryman designed
two P-30s—the 24-inch wingspan
V-dihedral Baby Speckled Bird and the
30-inch wingspan gull-dihedral Sparrow
Hawk Speckled Bird.
Don DeLoach has laser-cut rib sets
for both of those models. Plans for each
(#920 and #919) are available from the
National Free Flight Society (NFFS)
plans service at $8 apiece, plus $3
Another option for the event is the
laser-cut Speckled-P- 30 BMJR Models
kit. The Baby Speckled Bird that George
designed was simplified and enlarged
to a 28-inch wingspan. If you are a fast
builder, you can have your aircraft ready
for the 2017 Nats.
Dime Scale Yak- 7
One of the photos this month is of the
aft fuselage structure of a Dime Scale
Yak- 7 that I built from Mike Nassise
plans. It illustrates four tips that apply
not only to Dime Scale, but also to larger
Let’s look at the upper formers. The
upper formers are typical of those used
on models with turtledecks. If you cut
the formers so that the balsa grain is
vertical, the former often splits at the
top. If you cut the former so that the
grain is horizontal, the former’s “legs” are
weak and can split.
To solve that problem, I have begun
laminating two sheets of 1/32-inch cross-grained balsa using Duco cement. Duco
is easier to sand and cut through than
CA adhesive. You can cut out the former
in either direction and have strength
in both directions. For best laminating
results, use a flat weight on the sheets
while the glue is setting up.
Note the two crosspieces on the
bottom of the fuselage below the motor
peg mount. Leave the space between
the two pieces open so that it will be
easier to load the rubber motor.
Also note the 1/16 x 1/8-inch bottom
crosspiece between the back of the wing
mount and the two crosspieces that was
previously mentioned. This crosspiece is
placed where I plan to hold the fuselage
when I launch the model. I don’t
know how many fuselage longerons I
broke before I began to use this simple,
Fourth, if you look carefully, you will
see tapered 1/16-inch square, 3/16-inch
long braces on
the top and bottom
fuselage longerons, slightly
in front of the rear motor peg mounts.
These four small braces prevent the
peg mounts from dislocating under the
tension of a fully wound motor. A stitch
in time saves nine …
Bill Schmidt’s Thermal Bagger is from
plans in a 1941-era kit offered by the
Supreme Model Company. Interestingly,
the company’s kits were designed by,
and the company owned by, none other
than Tony Italiano!
Polyspan provides strength on the
fuselage and Japanese tissue was used on
the flying surfaces. Four strands of 1/8-
inch rubber provide the power. Weight
without the motor is 1. 35 ounces.
You might wonder where that
brilliant orange came from. It is Sanford
Permanent Marker dye in nontautening
nitrate dope. Following is Bill’s
127 Model Aviation JULY 2017 www.ModelAviation.com sponsored by HOW-TO issue
One-Design is three
by Gene Smith