2012 FE Nationals
By David Newland
NAMBA FE Chairman
This years FE National Event, hosted
jointly by the Scottsdale Model Boaters
and SoCal FE, will be held at Legg Lake
in S. El Monte, CA from June 19
th
through
the 23rd. Though Legg Lake has been a
staple NAMBA race site for 41 years, it
will be the first time a FE National event
will be held there. This event is being
sponsored by www.offshoreelectrics.com
Race information can be found on the
www.offshoreelectrics.com forum, under
Upcoming Race Events.
Also, class sponsorships are available
at $50 per class. Sponsorship and/or raffle
support would be greatly appreciated.
Thank you for your consideration.
If you have any questions, I can be
reached at dnewland49@msn.com.
In Memory of Bill Young
Bill Young, one of NAMBA’s original
Life Members, passed away on November
30
th
at the age of 77. While Bill had not
been an active boater for many years, he
was one of District 19’s early members.
He was also very involved in model
aeronautics and was inducted into the
AMA Hall of Fame in 2011. His back-
ground in Electrical Engineering lent itself
well to model boating career. He had been
living in Flagstaff, AZ for the past 16
years. While many of you may not have
had the pleasure of knowing Bill, I know
that he will be missed by many of the “old
timers” in NAMBA. His contributions to
the early days of NAMBA will continue to
be a part of our history.
PROPWASH
April 2012
5
the same. A general purpose design for peak power was tested. The 17.2 mm starting
diameter has the same round area as the Zenoah’s rectangular exhaust flange.
You will find that the shape of the waves are not as ideal as those in the first
example on page 4. They are also not as powerful. That’s a factor of the engine port
size and timing as well as the pipe.
First let’s see what different baffle cone angles do. Below are drawings of two
pipes with different baffle cone angles.
The length to the stinger is the same on all the pipes, but the G8 pipe has a steeper
baffle cone and the G9 pipe has a shallower baffle cone than the G3’s pipe.
Graphs will show that the G9 pipe with the large baffle cone angle gains low end
power but looses over rev power. The opposite is true for the smaller baffle cone
angle.
Next let’s look at several diffuser designs on page 6.