Here is the side-view drawing for the author’s new Enlightening Bug design, inspired by Bob
Baron’s Humbug. The aesthetics were dressed up to have a jetlike look, but still be an easy-to-build model.
The Enlightening Bug’s fuselage was built using the Tru-Fit construction system. Bob offers a free
PDF of this building method. The molded balsa shells are of lightweight, accurate construction.
The Enlightening Bug project
by Bob Hunt
I’ve received a number of emails and telephone calls regarding the Enlightening Bug project that I wrote
about in my March 2016 column. It
seems that many have been searching for
a model that has the attributes that this
aircraft promises to possess.
To recap, I have always thought
that Bob Baron’s Humbug design
would make an ideal Control Line
(CL) Aerobatics (Stunt) airplane for
intermediate- or even advanced-class
fliers. It has no flaps, is relatively small,
and has outrigger booms to support
its long stabilizer, so it would be
very rigid and twist resistant (see the
Humbug photos in the March 2016 “CL
I stretched a new set of “clothes” on
the Humbug, and opted to power it with
an electric motor system. I initially called
it the Lightening Bug, but my friend,
Tom Huff (who is also building one),
said it should be called the Enlightening
Bug because it promises to teach him
new flying and building lessons. So,
Enlightening Bug it is!
I am fast-tracking this build because
of the amount of interest the model has
generated. If you wonder what it will
look like from a side view (basically,
only the side-view aesthetic has been
altered), take a look at the photo of the
rough working drawing presented here.
(Note that the outrigger booms are not
depicted on the side-view drawing.) I
tried to give it some jetlike appeal, but it
could easily be modified to look like any
type of airplane that you desire.
Tom and I each built wings for our
Bugs using my Lost-Foam Building
System. Details of this system are
available in a PDF manual that I have
prepared. I’ll send it to you at no cost
with an email request. To my knowledge,
it is the only wing-building system that
keys on the outside shape of the wing.
Because of that, no stresses are built into
the structure, which can be the case with
many internal fixture methods.
We built the fuselage crutches using
the Tru-Fit Fuselage Construction system
that my son, Robby, and I developed.
A free manual for that system is also
available in PDF format.
This electric-powered model will have
little or no vibration, so I opted to make
the fuselage sides from 1/16-inch balsa
and make the formers from cross-grain
1/16-inch balsa. The top and bottom
molded shells are likewise made from
1/16-inch balsa, so the finished product
is extremely lightweight! The fuselage
crutch assembly, with the motor mount
installed and the raw top and bottom
molded shells, weighs 1. 89 ounces!
The base wing structure with the
molded leading edge shells attached, the
115 Model Aviation JULY 2016