13
making thrust adjustments for high power, use very minimal changes. When consistent
flights are achieved at maximum power (8-9 in/oz. torque), finalize the thrust setting by
sanding the front of the fuselage to match the angle established by the temporary shims, or
build in permanent shims to allow repeat of the thrust setting on each flight. If trimmed
correctly, your model will spiral up in a right hand turn under power, level off and continue to
orbit to the right as the motor expires it’s energy and the prop begins to freewheel. The glide
at this point should be very flat and sustained-if the model picks up speed and appears to fly
fast, adjust the incidence screw out about 3/4 turn until the glide flattens to a minimum sink
speed (just above stall). If the glide transitions into a roller coaster stall and recovery, tighten
the incidence screw in about 3/4 turn until the glide flattens and becomes smooth and slow. It
may take 8-10 full power flights to observe the model and get it adjusted for maximum
performance.
Make sure your D/T setup is functional before attempting powered flights. This model will
disappear easily if the D/T does not release! Put your name and phone number on the model
too-you may get it back.
Esaki covered models will fade quickly if left exposed to light. For maximum protection from
fading and warping, it is suggested to store the model in a cardboard box or other storage
container. Models stored in this manner will look fresh for many months and perform
consistently.
Motor setups
If you have never built and flown rubber powered models, visit our website to view an article
concerning the methods of making motors, installing and maintaining them. Otherwise, some
basic recommendations for motors follow:
13 grams of 3/16 SuperSport rubber (included in kit) formed into two loops is a very
serviceable motor to start, and will provide fairly long runs. Wind this to 8-9 in oz. torque for
a motor run of approximately 80-90 seconds. Four loops of 1/8 SuperSport wound to 9-10 in
oz torque offers a powerful climb but run time about 53 seconds. Experiment with other
motor sizes and weights to obtain a long duration run and moderate climb performance for
maximum cruise time to stay in lifting air. Overpowering the model may not improve
performance, as it is possible to overspeed the prop and reduce efficiency with excessive
power.
This model has been flown with a balsa folding prop quite successfully. A free download plan
for a folding prop is available on our website.
Good luck with your model. If you need further assistance, contact us at
www.cbmodeldesigns.com
This construction manual is also available to view and download
on line at our website.
Resources
IKARA
viscous timers,
Tan SUPERSPORT
rubber,
Crocket
hooks, dental bands, other FF
model supplies and tools all available from:
FAI Model Supply
P.O. Box 366
Sayre PA 18840-0366 USA
phone or FAX 570-882-9873
or contact at:
www.faimodelsupply.com
