Left: Mark Rittinger’s
own design of the Daryl
Unlimited racer was
published in Electric
Flight in January 2015.
It has a 42.75-inch
wingspan, a Power 32
E-flite motor, and a 3S
2,700 65C LiPo battery
pack. The aircraft has
an E-flite 60 Pro ESC, 13
x 10 APC propeller, and
UltraCote covering. It
weighs 62 ounces ready
Right: Keith Shaw’s
28%-scale 1934 German
homebuilt Moeller Stomo
has an 87-inch wingspan
and weighs 7. 3 pounds. It
is powered with a geared
Astro brushless 40 on eight
A123 cells and a 15 x 10
propeller. The maximum
power is less than 500
watts ( 68 watts per pound).
routine consumed only 1.0
amp per hour! With good
throttle management, he
can comfortably practice
aerobatics for roughly 15
sentiments three times. I know time can
be taken up “entertaining” guests, but at
a time when our hobby is in jeopardy,
we all need to be ambassadors for the
I will try not to trouble them next
year when I visit Denver again.
Batteries seem to be a hot topic and
one of increasing interest. I encourage
you to review the four-part series that
Model Aviation published in 2015 and
let us know if there are particular areas
that still confuse you.
One upcoming topic will be to
explain/clarify the 80% rule when
discharging LiPo batteries. Let me know
what else is puzzling you and I’ll work it
into the schedule.
Remember, this is a bimonthly
column, so information can take some
time to show up in print. I do try to
answer all emails.
People seemed to appreciate the
connector chart that the editor inserted
into my feature article in the July 2015
issue. I agree that the editors did a great
job putting that information together. It
also raised a couple of questions.
Why do two connectors using the same
size wire differ so in current ratings?
This primarily boils down to quality
of materials, both in base metal and the
plating used. The better the materials,
the more efficient it will be, and the
rating will be higher.
There is also the issue of surface area
contact. The more area that makes
physical contact, the better it can
transfer power. This can also be affected
by the quality of your soldering job
and that’s outside the manufacturer’s
Why didn’t you include information
about the current capacity of wire gauges?
I kept it simple. The larger the gauge, the
less resistance, and the more current it
will handle. That is very simplistic, but
I encourage you to check the Electric
Flyers Only, Inc. website and the Ampeer
newsletter, where Ken Myers, editor of
the newsletter, goes much deeper into
this subject. It’s far more complicated
than you can imagine and Ken has the
page space for in-depth coverage of the
A Great Electric Fly-In!
After getting “the bum’s rush” from
the club in Denver, it was a pure joy to
102 Model Aviation DECEMBER2015