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Sun Flyer 2 electric Part 23 airplane took flight for the first time; endurance of 3.5 hours

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Old February 18th 19, 08:10 PM posted to rec.aviation.piloting
Larry Dighera
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Default Sun Flyer 2 electric Part 23 airplane took flight for the first time; endurance of 3.5 hours


Sun Flyer Flies With Siemens

By Russ Niles | February 17, 2019

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Bye Aerospace’s Sun Flyer 2 electric Part 23 airplane took flight for
the first time with its intended production configuration on Feb. 8
and President George Bye said all went well. The two-seat aircraft,
which Bye intends to be fully certified, flew with the Siemens-built
SP70D motor with a maximum of 120 horsepower and maximum continuous
power of 94 horsepower. The motor only weighs 57 pounds and Bye is
predicting the aircraft will be certified with a three-hour endurance
with VFR reserves.

Bye is targeting the flight training market with the Sun Flyer 2,
predicting it will slash operating costs for schools and make flight
training more accessible. It’s also planning a four-place version. The
propulsion and battery package is critical to those goals and Siemens
spokesman Dr. Frank Afton said the Feb. 8 flight marks a milestone.
“This successful test flight is a proud moment for the Siemens and Bye
Aerospace teams and marks a milestone in bringing the age of electric
flight to life."

Video: https://www.youtube.com/watch?v=W0TKoq-b3nA

Comments (4)
This is what the future looks like.

At least as significant, from the bye aerospace website:

"Sun Flyer 2's program application to the FAA was accepted under FAR
23 certification criteria in the spring of 2018. The Sun Flyer 2
prototype will conduct extensive additional flight test activities in
2019 and continue to work closely with FAA representatives on
certification activities."

Oftentimes, all you gotta do is ask.

Posted by: Rollin Olson | February 18, 2019 12:48 AM

"The motor only weighs 57 pounds."
Great. But how much do its batteries and associated hardware weigh?
Apples-to-apples, please.

Posted by: YARS (Tom Yarsley) | February 18, 2019 6:49 AM

Building a high efficiency, high performance electric motor is
relatively easy. Building a battery pack with similar performance that
does not eat up all your useful load is another matter. I wish them

Posted by: John McNamee | February 18, 2019 10:07 AM

I have not been able to find an engineering performance analysis to
back up any of the SunFlyer 2 performance claims, in particular, its
claimed endurance of 3.5 hours. Does such a credible performance
analysis exist?

Posted by: Paul Madden | February 18, 2019 11:59 AM


Bye Aerospace is a world leader and innovator of electric and
solar-electric aircraft. The company, which was founded in 2007 and is
headquartered near Denver at Centennial Airport, is developing and
flight testing prototypes of all-electric general aviation training,
personal and business aircraft, and medium and high altitude
solar-electric long endurance UAVs, focusing on advances in energy and
design efficiencies. We are growing and revolutionizing the general
aviation, aerospace and defense industries. In fact, Bye Aerospace was
named one of the “Top 50 Colorado Companies to Watch” for 2017, and
Denver Business Journal selected Bye Aerospace as the “Small Business
Award” category winner for 2018.

“The Bye Aerospace all-electric Sun Flyer will be 1st to market with
the world’s first FAA certified electric aircraft.” George Bye, CEO


Established in February 2014, the Sun Flyer program was created by Bye
Aerospace to produce the two seat “Sun Flyer”, and for it to be fully
certified under the new FAR 23, and bring it to market. We intend to
serve general aviation by providing a clean, renewable energy,
electric training aircraft. As of December 2018 we have 220 deposits,
split evenly between the Sun Flyer 2 and Sun Flyer 4. Check out the
video of the Sun Flyer 2 prototype in flight below.

This two-seat aircraft will change the way pilots train. The
cost-efficient aircraft will enable new pilots to train without
prohibitive fuel costs.

Check out this exciting speech from CEO, George Bye at the Sun Flyer
Roll out Event on May 11, 2016: https://youtu.be/NCzv2rqpSOQ


Starting in 2019, the Sun Flyer 2 is priced at $349,000 and requires a
$5,000 deposit.
The 4-seat Sun Flyer 4 is priced at $449,000 and requires a $10,000

Demand for new airline pilots has increased dramatically. According to
Boeing (2018), an estimated 790,000 new commercial and airline pilots
are needed, (up from 637,000 estimated in 2017) over the next 20
years. This is over a 5-fold increase of the 150,000 airline pilots
flying today and a timely market entry for the high-tech Sun Flyer
trainer. To meet this pilot training demand, it is estimated that
66,000 training aircraft are needed over this 20-year time period. In
addition, we estimate 9,000 of the existing fleet of 15,000 flight
trainers will be replaced due to cost and age-related issues leaving a
net of 60,000 new training aircraft to meet the Boeing estimated
global demand of new pilots. Of this total, the Sun Flyer target
market is 20,000 units ($7.2B potential market) over 20 years.

The existing 230,000-unit General Aviation fleet is ripe for
replacement. The majority of these aircraft were manufactured between
1960 and 1983 when production averaged over 10,000 units per year.
Sales slumped in the early 1980’s due to rising fuel cost and high
interest rates. According to the FAA and GAMA, there were 10,800
two-seat trainers in use, with an average 48-years old over 10 years
ago in 2008. These old aircraft are difficult and costly to maintain,
burn expensive leaded avgas producing CO2, and are nearing

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