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Date: Mon, 18 Sep 2017 20:54:00 +0000
Subject: Prototype of a Hydro-Pneumatic Human Power Plant
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HUMAN POWER PLANT

///////////////////////////////////////////
Prototype of a Hydro-Pneumatic Human Power Plant

Posted: 18 Sep 2017 05:30 AM PDT
http://www.humanpowerplant.be/2017/09/prototype-hydro-pneumatic-human-power-plant.html


Image: The Human Power Plant in its second location, Deventer, the
Netherlands.

The Human Power Plant is a working prototype of a muscular power generator,
manned by a group of people. We cooperated with makers and sports coaches
to build exercise machines that are suited for different types of human
power sources, are fun and social to use, and produce a maximum amount of
power.
The Human Power Plant is an all-round off-the-grid solution. It can supply
energy anywhere and anytime, provided that humans can be motivated to
operate it. The power plant supplies energy in the form of electricity,
water under pressure, and compressed air. It is built from simple and
durable parts.
***
These days, we have automated and motorised even the smallest physical
efforts. At the same time, we go to the gym to keep in shape, generating
energy that's wasted. The Human Power Plant restores the connection between
physical exercise and energy use.
Hydraulic-Pneumatic System

The human power plant consists of several exercise machines, which are set
up around an energy storage and regulating device. Roughly half of the
exercise machines are pumping water into a pressure vessel, while the other
half are pumping air into a smaller tank.

The air from the smaller vessel then compresses the water in the larger
one, increasing the energy potential of the hydro-pneumatic accumulator
(small + large tank).

Next, water under pressure is led to a Pelton wheel, which can supply
mechanical energy or electricity (if coupled to a generator). The water
falls from the water turbine into a receiving reservoir, from where it can
be pumped into the accumulator again.


Human Powered Jacuzzi

The receiving reservoir of this closed water system is converted into a
shower/jacuzzi, where power producers can cool down and relax after their
effort.

The electricity produced by the Pelton turbine can be used to heat the
water of the jacuzzi, while compressed air can generate bubbles and water
under pressure can produce water jets.

The receiving reservoir of the system, ready to be used as a jacuzzi or
shower. The Pelton turbine is above the blue plastic sheet, which has small
holes to create a shower.

A Sustainable Battery

We opted for water under pressure and compressed air for several reasons.
First, we want to make energy more visible and audible. Electricity is used
all around us, but these energy flows are quiet and invisible. If we want
to focus on energy, we first need to be aware of it.

Second, water and air allow us to produce electricity without the use of
chemical batteries and electronics -- which are not sustainable components.
In our muscular power generator, the hydro-pneumatic accumulator takes over
the role of the battery and the voltage regulator.

Energy storage and regulation: hydro-pneumatic accumulator.

In this way, small variations in human power production can be smoothed
out, keeping the voltage constant. Longer term energy storage is supplied
by the humans themselves. Unlike solar and wind energy, human power is
always available.
The human power plant is built from simple and mostly scavenged parts. The
machine can be maintained and repaired by a plumber. Unlike chemical
batteries, which need to be replaced every few years, the human power plant
can be operated for decades.
Exercise Machines

Exercise machines for strength training can produce a lot of power in a
very short time, making them an interesting addition to stationary cycling
machines for human power generation. Having the choice allows people to
choose which bodily advantages they gain from their efforts.


The human power plant is a work in progress. Each time the contraption is
moved to another location, we improve, adapt or replace modules. The
exercise machines described below concern the set-up in Deventer, the
Netherlands, where the human power plant was exhibited in July/August 2017.
1. Reverse Hack Squat
The Reverse Hack Squat is aimed at strength training. A person stands with
curved knees below the bar and stretches his or her legs. The exercise
mainly builds leg muscles and strengthens the bones and the tendons.
This exercise machine converts human power into compressed air, which is
used to pressurise water. The machine also produces a wonderful sound.

Our legs are roughly four times stronger than our arms, and this exercise
machine is our most powerful producer of compressed air. The effort that's
required to lift the bar increases as the pressure vessel fills up.
2. The Cross Trainer

The Cross Trainer is the archetypal exercise machine, aimed at endurance
training. The exercise strengthens the heart and the lungs.

Almost all the muscles are used, but the load on the body is the heaviest
on the legs and the shoulders. The muscles of the torso are also used,
especially for maintaining stability.


The arms push the levers forward and backward. This movement pumps water
into the pressure vessel. The legs are moved up and down as if walking up
the stairs. This movement is pumping air into the pressure vessel.

Arms and legs are moving at the same time, somewhat similar to the
movements during cross-country skiing. Two people can operate the machine
while looking at each other, which creates an intimate atmosphere. The
machine makes a lot of noise.
3. Biceps and Triceps Extension

This exercise machine, which produces compressed air, can be operated by
four people simultaneously.

One person operates the foot pedals, which work similar to the foot pedals
of the Cross Trainer that we described above. Two persons train their
biceps and triceps by moving the handles on each side up and down.


A fourth person turns the wooden wheel that operates an air compressor. The
latter produces delicious farting sounds and is very popular with children
and adults who refuse to grow up.

The manually operated air compressor is surprisingly effective. We aim to
improve it further by adding a better flywheel that is turned by a smaller
hand cranked wheel.
4. Heavy Pull Drag

The Heavy Pull Drag produces a large amount of power in a short time. The
machine is inspired by human drawn canal boats from earlier times. As an
exercise device, it appeared in the 1990s, aimed at American football
players.

To produce power, the operator puts on a harness with a cable attached to
it. The cable is wound around an old car rim, which is fixed to a powerful
membrane pump.


The operator walks forward or backward while wearing the harness, keeping
his/her body as low to the ground as possible. Walking forward trains the
muscles in the back, walking backward trains the quadriceps in the legs,
and pulling sidewards trains the muscles of the hip.

The Heavy Pull Drag is our most powerful water pump. Although it works very
well, it needs some further improvements. The most important one is a
mechanism that rolls the cable in automatically.
Where is the Human Power Plant?

June 2017: Zero Footprint Campus, Utrecht, the Netherlands.
July/August 2017: Kunstenlab, Deventer, the Netherlands.
September 2017: Archipel, Antwerp, Belgium.
...


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<a style=3D"color:#888;font-size:22px;font-family:Arial, Helvetica, sans-se=
rif;font-weight:normal;text-decoration:none;" href=3D"http://www.humanpower=
plant.be/" title=3D"(http://www.humanpowerplant.be/)">Prototype of a Hydro-=
Pneumatic Human Power Plant</a>
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<a name=3D"1" style=3D"font-family:Arial, Helvetica, sans-serif;font-size:1=
8px;" href=3D"http://www.humanpowerplant.be/2017/09/prototype-hydro-pneumat=
ic-human-power-plant.html">Prototype of a Hydro-Pneumatic Human Power Plant=
</a>
</p>
<p style=3D"font-size:13px;color:#555;margin:9px 0 3px 0;font-family:Georgi=
a,Helvetica,Arial,Sans-Serif;line-height:140%;font-size:13px;">
<span>Posted:</span> 18 Sep 2017 05:30 AM PDT</p>
<div style=3D"margin:0;font-family:Georgia,Helvetica,Arial,Sans-Serif;line-=
height:140%;font-size:13px;color:#000000;">
<div xmlns=3D"http://www.w3.org/1999/xhtml"><div id=3D"photo-xid-6a00e00992=
29e8883301b7c9212875970b" class=3D"photo-wrap photo-xid-6a00e0099229e888330=
1b7c9212875970b" style=3D"display: inline-block; width: 700px;"><a class=3D=
"asset-img-link" href=3D"http://krisdedecker.typepad.com/.a/6a00e0099229e88=
83301b7c9212875970b-pi"><img class=3D"asset  asset-image at-xid-6a00e009922=
9e8883301b7c9212875970b img-responsive" style=3D"width: 700px;" alt=3D"Huma=
n power plant " title=3D"Human power plant " src=3D"http://krisdedecker.typ=
epad.com/.a/6a00e0099229e8883301b7c9212875970b-700wi" /></a>
<div id=3D"caption-xid-6a00e0099229e8883301b7c9212875970b" class=3D"photo-c=
aption caption-xid-6a00e0099229e8883301b7c9212875970b">Image: The Human Pow=
er Plant in its second location, Deventer, the Netherlands.</div>
</div>
<p style=3D"text-align: left;"><span style=3D"font-size: 12pt;">The Human P=
ower Plant is a working prototype of a muscular power generator, manned by =
a group of people. We cooperated with makers and sports coaches to build ex=
ercise machines that are suited for different types of human power sources,=
 are fun and social to use, and produce a maximum amount of power.</span></=
p>
<p style=3D"text-align: left;"><span style=3D"font-size: 12pt;">The Human P=
ower Plant is an all-round off-the-grid solution. It can supply energy anyw=
here and anytime, provided that humans can be motivated to operate it. The =
power plant supplies energy in the form of electricity, water under pressur=
e, and compressed air. It is built from simple and durable parts.</span><sp=
an style=3D"font-size: 12pt;"></span></p>
<p style=3D"text-align: center;"><span style=3D"font-size: 12pt; background=
-color: #ffffff;">***</span></p>
<p style=3D"text-align: left;"><span style=3D"font-size: 12pt;">These days,=
 we have automated and motorised even the smallest physical efforts. At the=
 same time, we go to the gym to keep in shape, generating energy that's was=
ted. The Human Power Plant restores the connection between physical exercis=
e and energy use.</span></p>
<p style=3D"text-align: center;"><span style=3D"font-size: 12pt; background=
-color: #ffffff;"><strong>Hydraulic-Pneumatic System</strong></span></p>
<p><span style=3D"font-size: 12pt;">The human power plant consists of sever=
al exercise machines, which are set up around an energy storage and regulat=
ing device. Roughly half of the exercise machines are pumping water into a =
pressure vessel, while the other half are pumping air into a smaller tank.<=
/span></p>
<p><span style=3D"font-size: 12pt; background-color: #ffffff;">The air from=
 the smaller vessel then compresses the water in the larger one, increasing=
 the energy potential of the hydro-pneumatic accumulator (small + large tan=
k).&nbsp;</span></p>
<p><span style=3D"font-size: 12pt;">Next, water under pressure is led to a =
<a href=3D"https://en.wikipedia.org/wiki/Pelton_wheel" target=3D"_blank" re=
l=3D"noopener noreferrer">Pelton wheel</a>, which can supply mechanical ene=
rgy or electricity (if coupled to a generator). The water falls from the wa=
ter turbine into a receiving reservoir, from where it can be pumped into th=
e accumulator again.</span></p>
<p><span style=3D"font-size: 12pt;"> <a class=3D"asset-img-link" style=3D"d=
isplay: inline;" href=3D"http://krisdedecker.typepad.com/.a/6a00e0099229e88=
83301bb09c45c1d970d-pi"><img class=3D"asset  asset-image at-xid-6a00e009922=
9e8883301bb09c45c1d970d image-full img-responsive" alt=3D"Human Power Plant=
 How it Works Melle Smets Kris De Decker " title=3D"Human Power Plant How i=
t Works Melle Smets Kris De Decker " src=3D"http://krisdedecker.typepad.com=
/.a/6a00e0099229e8883301bb09c45c1d970d-800wi" border=3D"0" /></a></span></p=
>
<p style=3D"text-align: center;"><span style=3D"font-size: 12pt;"><strong>H=
uman Powered Jacuzzi</strong></span></p>
<p><span style=3D"font-size: 12pt;">The receiving reservoir of this closed =
water system is converted into a shower/jacuzzi, where power producers can =
cool down and relax after their effort.</span></p>
<p><span style=3D"font-size: 12pt;">The electricity produced by the Pelton =
turbine can be used to heat the water of the jacuzzi, while compressed air =
can generate bubbles and water under pressure can produce water jets</span>=
.</p>
<div id=3D"photo-xid-6a00e0099229e8883301b8d2ab7f75970c" class=3D"photo-wra=
p photo-xid-6a00e0099229e8883301b8d2ab7f75970c" style=3D"display: block; ma=
rgin-left: auto; margin-right: auto; width: 350px;"><a class=3D"asset-img-l=
ink" href=3D"http://krisdedecker.typepad.com/.a/6a00e0099229e8883301b8d2ab7=
f75970c-pi"><img class=3D"asset  asset-image at-xid-6a00e0099229e8883301b8d=
2ab7f75970c img-responsive" style=3D"width: 350px;" alt=3D"Human Power Plan=
t Melle Smets Kris De Decker" title=3D"Human Power Plant Melle Smets Kris D=
e Decker" src=3D"http://krisdedecker.typepad.com/.a/6a00e0099229e8883301b8d=
2ab7f75970c-350wi" /></a>
<div id=3D"caption-xid-6a00e0099229e8883301b8d2ab7f75970c" class=3D"photo-c=
aption caption-xid-6a00e0099229e8883301b8d2ab7f75970c">The receiving reserv=
oir of the system, ready to be used as a jacuzzi or shower. The Pelton turb=
ine is above the blue plastic sheet, which has small holes to create a show=
er.</div>
</div>
<p style=3D"text-align: center;"><span style=3D"font-size: 12pt; background=
-color: #ffffff;"><strong>A Sustainable Battery</strong></span></p>
<p><span style=3D"font-size: 12pt;">We opted for water under pressure and c=
ompressed air for several reasons. First, we want to make energy more visib=
le and audible. Electricity is used all around us, but these energy flows a=
re quiet and invisible. If we want to focus on energy, we first need to be =
aware of it.</span></p>
<p><span style=3D"font-size: 12pt;">Second, water and air allow us to produ=
ce electricity without the use of chemical batteries and electronics -- whi=
ch are not sustainable components. In our muscular power generator, the hyd=
ro-pneumatic accumulator takes over the role of the battery and the voltage=
 regulator.</span></p>
<div id=3D"photo-xid-6a00e0099229e8883301b8d2ab7f8e970c" class=3D"photo-wra=
p photo-xid-6a00e0099229e8883301b8d2ab7f8e970c" style=3D"display: block; ma=
rgin-left: auto; margin-right: auto; width: 500px;"><a class=3D"asset-img-l=
ink" href=3D"http://krisdedecker.typepad.com/.a/6a00e0099229e8883301b8d2ab7=
f8e970c-pi"><img class=3D"asset  asset-image at-xid-6a00e0099229e8883301b8d=
2ab7f8e970c img-responsive" alt=3D"Hydro-pneumatic accumulator for human po=
wer plant kris de decker melle smets" title=3D"Hydro-pneumatic accumulator =
for human power plant kris de decker melle smets" src=3D"http://krisdedecke=
r.typepad.com/.a/6a00e0099229e8883301b8d2ab7f8e970c-500wi" /></a>
<div id=3D"caption-xid-6a00e0099229e8883301b8d2ab7f8e970c" class=3D"photo-c=
aption caption-xid-6a00e0099229e8883301b8d2ab7f8e970c">Energy storage and r=
egulation: hydro-pneumatic accumulator.</div>
</div>
<p style=3D"text-align: left;"><span style=3D"font-size: 12pt;">In this way=
, small variations in human power production can be smoothed out, keeping t=
he voltage constant. Longer term energy storage is supplied by the humans t=
hemselves. Unlike solar and wind energy, <a href=3D"http://www.humanpowerpl=
ant.be/2017/05/how-to-motivate-human-power-1.html">human power is always av=
ailable</a>.&nbsp;</span></p>
<p style=3D"text-align: left;"><span style=3D"font-size: 12pt;">The human p=
ower plant is built from simple and mostly scavenged parts. The machine can=
 be maintained and repaired by a plumber. Unlike chemical batteries, which =
need to be replaced every few years, the human power plant can be operated =
for decades.</span></p>
<p style=3D"text-align: center;"><span style=3D"font-size: 12pt;"><strong s=
tyle=3D"font-size: 17.3333px; text-align: center;">Exercise Machines</stron=
g></span></p>
<p><span style=3D"font-size: 12pt;">Exercise machines for strength training=
 can <a href=3D"http://www.humanpowerplant.be/2017/05/power-potential-vario=
us-exercise-machines.html">produce a lot of power in a very short time</a>,=
 making them an interesting addition to stationary cycling machines for hum=
an power generation. Having the choice allows people to choose which bodily=
 advantages they gain from their efforts.</span></p>
<p><span style=3D"font-size: 12pt; background-color: #ffffff;"> <a class=3D=
"asset-img-link" href=3D"http://krisdedecker.typepad.com/.a/6a00e0099229e88=
83301bb09c45cac970d-pi"><img class=3D"asset  asset-image at-xid-6a00e009922=
9e8883301bb09c45cac970d img-responsive" alt=3D"Human power generator compre=
ssed air and water under pressure kris de decker melle smets" title=3D"Huma=
n power generator compressed air and water under pressure kris de decker me=
lle smets" src=3D"http://krisdedecker.typepad.com/.a/6a00e0099229e8883301bb=
09c45cac970d-500wi" style=3D"display: block; margin-left: auto; margin-righ=
t: auto;" /></a><br /></span></p>
<p><span style=3D"font-size: 12pt;">The human power plant is a work in prog=
ress. Each time the contraption is moved to another location, we improve, a=
dapt or replace modules. The exercise machines described below concern the =
set-up in Deventer, the Netherlands, where the human power plant was exhibi=
ted in July/August 2017.</span></p>
<p style=3D"text-align: center;"><span style=3D"font-size: 12pt;"><strong>1=
. Reverse Hack Squat</strong></span></p>
<p style=3D"text-align: left;"><span style=3D"font-size: 12pt;">The <em>Rev=
erse Hack Squat</em> is aimed at strength training. A person stands with cu=
rved knees below the bar and stretches his or her legs. The exercise mainly=
 builds leg muscles and strengthens the bones and the tendons.</span></p>
<p style=3D"text-align: left;"><span style=3D"font-size: 12pt;">This exerci=
se machine converts human power into compressed air, which is used to press=
urise water. The machine&nbsp;also produces a wonderful sound.</span></p>
<p style=3D"text-align: left;"><span style=3D"font-size: 12pt;"> <a class=
=3D"asset-img-link" style=3D"display: inline;" href=3D"http://krisdedecker.=
typepad.com/.a/6a00e0099229e8883301b7c9209cb3970b-pi"><img class=3D"asset  =
asset-image at-xid-6a00e0099229e8883301b7c9209cb3970b img-responsive" alt=
=3D"DSC00031" title=3D"DSC00031" src=3D"http://krisdedecker.typepad.com/.a/=
6a00e0099229e8883301b7c9209cb3970b-500wi" style=3D"display: block; margin-l=
eft: auto; margin-right: auto;" /></a></span><a class=3D"asset-img-link" st=
yle=3D"display: inline;" href=3D"http://krisdedecker.typepad.com/.a/6a00e00=
99229e8883301b7c9209522970b-pi"><img class=3D"asset  asset-image at-xid-6a0=
0e0099229e8883301b7c9209522970b img-responsive" alt=3D"Humen power reverse =
hack squat" title=3D"Humen power reverse hack squat" src=3D"http://krisdede=
cker.typepad.com/.a/6a00e0099229e8883301b7c9209522970b-500wi" style=3D"disp=
lay: block; margin-left: auto; margin-right: auto;" /></a><a class=3D"asset=
-img-link" style=3D"display: inline;" href=3D"http://krisdedecker.typepad.c=
om/.a/6a00e0099229e8883301bb09c3c6d0970d-pi"></a><a class=3D"asset-img-link=
" style=3D"display: inline;" href=3D"http://krisdedecker.typepad.com/.a/6a0=
0e0099229e8883301b8d2aaec5e970c-pi"></a></p>
<p style=3D"text-align: left;"><span style=3D"font-size: 12pt;">Our legs ar=
e roughly four times stronger than our arms, and this exercise machine is o=
ur most powerful producer of compressed air. The effort that's required to =
lift the bar increases as the pressure vessel fills up.</span></p>
<p style=3D"text-align: center;"><span style=3D"font-size: 12pt;"><strong s=
tyle=3D"font-size: 17.3333px; text-align: center;">2. The Cross Trainer</st=
rong></span></p>
<p><span style=3D"font-size: 12pt;">The <em>Cross Trainer</em> is the arche=
typal exercise machine, aimed at endurance training. The exercise strengthe=
ns the heart and the lungs. </span></p>
<p><span style=3D"font-size: 12pt;">Almost all the muscles are used, but th=
e load on the body is the heaviest on the legs and the shoulders. The muscl=
es of the torso are also used, especially for maintaining stability.</span>=
</p>
<p><span style=3D"font-size: 12pt;"> <a class=3D"asset-img-link" href=3D"ht=
tp://krisdedecker.typepad.com/.a/6a00e0099229e8883301bb09c45d00970d-pi"><im=
g class=3D"asset  asset-image at-xid-6a00e0099229e8883301bb09c45d00970d img=
-responsive" style=3D"width: 350px; display: block; margin-left: auto; marg=
in-right: auto;" alt=3D"Human power generator compressed air water under pr=
essure" title=3D"Human power generator compressed air water under pressure"=
 src=3D"http://krisdedecker.typepad.com/.a/6a00e0099229e8883301bb09c45d0097=
0d-350wi" /></a></span></p>
<p><span style=3D"font-size: 12pt;">The arms push the levers forward and ba=
ckward. This movement pumps water into the pressure vessel. The legs are mo=
ved up and down as if walking up the stairs. This movement is pumping air i=
nto the pressure vessel.</span></p>
<p><span style=3D"font-size: 12pt;">Arms and legs are moving at the same ti=
me, somewhat similar to the movements during cross-country skiing. Two peop=
le can operate the machine while looking at each other, which creates an in=
timate atmosphere. The machine makes a lot of noise.</span></p>
<p style=3D"text-align: center;"><span style=3D"font-size: 12pt;"><strong>3=
. Biceps and Triceps Extension</strong></span></p>
<p><span style=3D"font-size: 12pt;">This exercise machine, which produces c=
ompressed air, can be operated by four people simultaneously. </span></p>
<p><span style=3D"font-size: 12pt;">One person operates the foot pedals, wh=
ich work similar to the foot pedals of the <em>Cross Trainer</em>&nbsp;that=
 we described above.&nbsp;Two persons train their biceps and triceps by mov=
ing the handles on each side up and down.</span></p>
<p><span style=3D"font-size: 12pt; background-color: #ffffff;"> <a class=3D=
"asset-img-link" style=3D"display: inline;" href=3D"http://krisdedecker.typ=
epad.com/.a/6a00e0099229e8883301bb09c3cf1d970d-pi"><img class=3D"asset  ass=
et-image at-xid-6a00e0099229e8883301bb09c3cf1d970d img-responsive" alt=3D"C=
ompressed air human power" title=3D"Compressed air human power" src=3D"http=
://krisdedecker.typepad.com/.a/6a00e0099229e8883301bb09c3cf1d970d-500wi" st=
yle=3D"display: block; margin-left: auto; margin-right: auto;" /></a></span=
></p>
<p><span style=3D"font-size: 12pt;">A fourth person turns the wooden wheel =
that operates an air compressor. The latter produces delicious farting soun=
ds and is very popular with children and adults who refuse to grow up.&nbsp=
;</span></p>
<p><span style=3D"font-size: 12pt;">The manually operated air compressor is=
 surprisingly effective. We aim to improve it further by adding a better fl=
ywheel that is turned by a smaller hand cranked wheel.</span></p>
<p style=3D"text-align: center;"><span style=3D"font-size: 12pt;"><strong>4=
. Heavy Pull Drag</strong></span></p>
<p><span style=3D"font-size: 12pt;">The <em>Heavy Pull Drag</em> produces a=
 large amount of power in a short time. The machine is inspired by <a href=
=3D"http://www.notechmagazine.com/2011/10/barge-haulers-on-the-volga-1870-1=
873.html" target=3D"_blank" rel=3D"noopener noreferrer">human drawn canal b=
oats</a>&nbsp;from earlier times. As an exercise device, it appeared in the=
 1990s, aimed at American football players.</span></p>
<p><span style=3D"font-size: 12pt;">To produce power, the operator puts on =
a harness with a cable attached to it. The cable is wound around an old car=
 rim, which is fixed to a powerful membrane pump.&nbsp;</span></p>
<p><span style=3D"font-size: 12pt;"><a class=3D"asset-img-link" style=3D"di=
splay: inline;" href=3D"http://krisdedecker.typepad.com/.a/6a00e0099229e888=
3301b7c9209b24970b-pi"><img class=3D"asset  asset-image at-xid-6a00e0099229=
e8883301b7c9209b24970b img-responsive" style=3D"width: 700px;" alt=3D"Heavy=
 pull drag" title=3D"Heavy pull drag" src=3D"http://krisdedecker.typepad.co=
m/.a/6a00e0099229e8883301b7c9209b24970b-700wi" /></a></span></p>
<p><span style=3D"font-size: 12pt;">The operator walks forward or backward =
while wearing the harness, keeping his/her body as low to the ground as pos=
sible.&nbsp;Walking forward trains the muscles in the back, walking backwar=
d trains the quadriceps in the legs, and pulling sidewards trains the muscl=
es of the hip.</span></p>
<p><span style=3D"font-size: 12pt;">The&nbsp;<em>Heavy Pull Drag</em>&nbsp;=
is our most powerful water pump. Although it works very well, it needs some=
 further improvements. The most important one is a mechanism that rolls the=
 cable in automatically.</span></p>
<p style=3D"text-align: center;"><span style=3D"font-size: 12pt;"><strong>W=
here is the Human Power Plant?</strong></span></p>
<ul>
<li><span style=3D"font-size: 12pt; background-color: #ffffff;">June 2017: =
<a href=3D"https://www.youtube.com/watch?v=3DuSIBynnA5QE" target=3D"_blank"=
 rel=3D"noopener noreferrer">Zero Footprint Campus</a>, Utrecht, the Nether=
lands.</span></li>
<li><span style=3D"font-size: 12pt; background-color: #ffffff;">July/August=
 2017: <a href=3D"http://www.overuit.nl/museum/expositie-human-power-plant-=
kunstenlab-deventer/detail.aspx?id=3D990530" target=3D"_blank" rel=3D"noope=
ner noreferrer">Kunstenlab</a>, Deventer, the Netherlands.</span></li>
<li><span style=3D"font-size: 12pt; background-color: #ffffff;">September 2=
017: <a href=3D"http://rooftoptiger.com/archipel/" target=3D"_blank" rel=3D=
"noopener noreferrer">Archipel</a>, Antwerp, Belgium.</span></li>
<li><span style=3D"font-size: 12pt; background-color: #ffffff;">...</span><=
/li>
</ul></div>
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