November 23, 1998
Pulsar weight and balance
Pulsar II and III aircraft
SkyStar Aircraft Product Development
factory prototype Pulsar III aircraft is equipped with a Rotax 914
engine and Hoffmann hydraulic constant-speed propeller. For a variety of
reasons including prototype construction techniques, heavy bodywork and
paint, and an elevator bob-weight, our aircraft is slightly tail heavy.
The builder’s manual directs lighter and more efficient construction
methods and proper elevator balancing, and encourages attention to
minimum bodywork and paint weight on the tail surfaces. We therefore
felt that in terms of balance, our aircraft was not representative of
the machines our customers would be building.
the course of completing the engine installation section of the
builder’s manual preliminary weight and balance calculations were run,
and it appears that with the lighter engines and propellers, such as the
Rotax 912 or 912S with a fixed-pitch or electric adjustable-pitch
propeller, Pulsars may be balancing out with an aft CG. We therefore
recommend that during the course of construction that the battery,
master solenoid, strobe power supply, ELT, and any other moveable
component be placed as far forward in the aircraft as possible. Just
behind the firewall is probably the farthest forward these items can be
realistically moved. The engine installation section of the builder’s
manual will soon be revised to reflect these changes.
we would like to re-emphasize the importance of keeping the tail of the
ship as light as possible. These measures should preserve the baggage
compartment capacity and help avoid the installation of ballast.