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percent of MAC aft of the upper-wing
leading edge? Thank you for your help.
Great article!
BILL TRUEBLOOD
Edgewater, MD
Bill; thank you for your feedback. It is true that
the bigger wing will generate a larger portion of
the lift than the smaller wing, even with the
slight difference in incidence. In practice, the
model will behave normally. Use the horizontal
distance from the top wing leading edge to the
bottom wing trailing edge as the MAC line, then
use the 25 percent point location for the balance
point. This will be a safe place to start. Also,
check where the plan designer indicated the CG.
I always start there and adjust accordingly after
I've test-flown the model. Depending on the
model's behavior, you may still have to slightly
adjust its balance point one way or the other.
When you finish your model, send us a picture
for "PilotProjects." GY
GYRO GYRATIONS
I just finished reading Rick Bell's article
about gyros. It was very helpful, as I have
always been curious about them and how
they work. I hope you can answer a question.
In the section, "Uses for gyros," it
states that using a gyro on the elevator and
the rudder can help a modeler learn to
torque roll. If I want to connect a gyro to a
particular axis for the rudder
and another axis for the
elevator, does that mean
I need two gyros?
JEFF COOMBES,
Austin, TX
Jeff; I'm glad that you found the information in
the gyro article useful. I had a lot of fun
researching the article and learned a lot about
gyros along the way. To answer your question: at
the present time, gyros control only one axis at a
time; so, yes, you'll need to use a separate gyro
on each control surface (elevator and rudder).
You can hook up both (with a Y-harness) to a
single auxiliary channel, so you'll be able to timi
them off when you're not using them.
Otherwise, the gyros will be active all the time,
and that will affect your control inputs. Be sure
to thoroughly test the gyro inputs and the gain
featiire before flying. RB
Head Lock (tm) Remote
spring loaded locking Glow
Plug Connector fits under Plane
cowls and Helicopter canopies,
letting you cover the glow plug
and head. #M021 Single
shown.
Remote Jack
allows you to
power your plug(s)
from anywhere on
the model, away
from
the
prop
Head Lock.
Head Lock Remote.
The Original Locking
GlowPlug Connectors.
Extended version
For deep heat sink
heads on cars, helicopters
and boats. (#M056)
Or for direct power: Head Lock
(tin) fits all standard glow plugs,
is powered by 1.2V to 1.5V battery
or Power Panel. (#M009
Shown)
Want to cover your engine? Or keep your hands away from the prop? Use a Head Lock
Remote. They look great, they work great and they're backed by Sullivan quality.
Head Lock Remotes are available in single (M021), Extended (M056) and twin (M022)
configurations. They have a low profile locking head and a
remote jack that can be hidden away from the engine. Head
Locks feature 18 gauge power cords and are available in
Standard (M009) and Professional (stainless steel, M037).
Sullivan. 50 years of setting the standard. Made in the USA.
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GETTING BETTER IDEAS OFF THE GROUND
COOL IT!
A brief note to express my gratitude for the
very informative article entitled "Cool It"
that appeared in your April 2002 issue.
Thanks to it, many of my longstanding
questions about model engine fuels and
engines were answered—a classic example
of the instructive and understandable
content you provide. Not all of us are
engineers, but we are people who thoroughly
enjoy model airplanes.
ED GILLANDERS
Poulsbo, WA
Thanks for your kind words regarding the
engine-cooling article. It's always a pleasure
to hear from readers who benefited from our
efforts! DAVE GIERKE
JUNE 2002 1 1