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Q?
Why does the 700E have such a high operating RPM? Is this normal
for a four-stroke engine?
A.
The
700E was designed to get two-stroke like power output from a four-stroke engine. The way to get more power from a given size engine is to make
it do more work, meaning more RPM. The
operating RPM range of the 700E is normal for an engine using modern
motorcycle technology. The
Rotax 912 four-stroke has a similar
operating range.
Q?
Why does the HKS have a gearbox, isn’t direct drive lighter and
simpler?
A.
The
larger the propeller, the more thrust it will produce, particularly at the
relatively slow climb
speeds of light aircraft. More
low speed thrust means more climb. As
well, there is the great benefit of much lower propeller noise than
direct drive. The 700E
gearbox has two ratios available 2.58 and 3.47 to 1.
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Q? Can the gearbox be positioned up or down?
Is it a big deal to swap the position? Can the engine be run inverted?
A. The gearbox
can be positioned up or down. To change the position the front cover is
removed and rotated. The HKS 700E cannot be run inverted.
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Q?
Why does the HKS have separate oil tank? And what is a “dry sump”
engine?
A.
The 700E has
a separate oil tank to reduce the package size of the engine.
Most conventional aircraft engines are dry sump for the same
reason. A “wet
sump” engine has it’s oil supply in the oil pan at the bottom of the
engine. A “dry sump”
engine has a separate scavenge pump to take the oil from the bottom of the
mini-sump at the bottom and a supply pump to send oil under pressure
through the engine. top
Q? Can the HKS
engine be used in pusher installations?
A.
Yes. As a matter of fact the 700E has been designed to work
specifically in both the pusher and tractor configurations. A majority
of the hundreds of engines sold are operating in the pusher
configuration. top
Q?
What type of engine mount does the HKS have? Do you sell mounts?
A.
The 700E has a base mount similar to but slightly different than the
Rotax. There is also a requirement that the engine mount has a hole for
in the center for the sump to fit into. We can work with you with the
design requirements or send you to an HPower Approved Dealer or OEM for
more help. We have worked with the many airframe manufacturers to
develop mounts. We feel that this is the best way as they know their
planes requirements.
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Q?
What type of fuel does the HKS require? Can it use 100LL?
A.
Automotive
Unleaded-high test is best. 92
octane Unleaded is typical. 100LL
Avgas can be used during cross countries without worry.
Constant use of leaded fuels requires different lubricating oils to be used to
avoid lead deposits. top
Q?
What is the fuel consumption of the HKS?
A.
The fuel
consumption in typical operation is between 2 gallons and 3 gallons an
hour. In our testing, the fuel consumption we have noted is 2.5
gallons an hour @ 75%. The Dyno testing according to the JIS (Japanese Industry
Standard) requires the engine to be tested in a manner that does not
reflect propeller loading. This makes HKS’s consumption numbers very conservative.
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Q?
What type of propellers work best for the HKS? Are they readily available?
A. The
propeller we have the greatest experience with is the Powerfin "F" model
propellers. Another propeller we recommend is the GSC from Canada.
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Q?
What type of exhaust is required?
Can you run straight pipes?
A.
The 700E was designed as a complete system. There are requirements for
back pressure and length of the exhaust manifold as a part of the
system. Both the intake and exhaust manifolds are optimized for a flat
torque curve.
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Q?
Are the carburetors used on the HKS altitude compensating?
Why don’t they use Fuel injection?
A.
The Bing C.V. (Constant Velocity) carburetors are capable of 50% mixture
compensation to approximately 10,000 Ft. due to the CV design which uses
a diaphragm-slider to vary the mid range mixture. The Rotax 912
four-stroke uses the same carburetors.
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Q? How much does a complete engine package
cost?
A.
HPower
sells the 700E as a complete system. We have chosen the best accessory
components we could find to match the quality of the engine itself.
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Q? What is the warranty on the HKS 700E?
A.
The Warranty is one year or 100 hours of engine time.
(end of Q&As)
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