I have designed and assembled
no less than 40 variations of the Flyer.
During these design iterations, I have
been able to create a somewhat
modular frame design. For instance,
the aluminum booms can be used on
the 430 mm reference build, or on a
extended 560 mm platform.
To create the 560 mm booms, I designed a set of
extensions that attach to them. These boom extensions
allow the motors to hang off the ends of each of the
booms as shown in Figure 1. These extend the motors
out an additional 65 mm on each side.
Extending the booms this way will present more
motor and prop options at very little cost in weight.
These extensions will allow you to increase the prop size
to 9" when using the original Flyer reference motors.
Expect flight times to be around five minutes when using
the 8 x 4. 5 slow fly props and a three-cell 2,200 mAh
I also created a set of extensions that can be used
with the popular hex Tronik DT700 and DT750 motors
available from HobbyKing. These motors are very efficient
and offer longer flight times when utilizing larger props.
When using the DT700 motor, I recommend a
10 x 4. 5 prop and three-cell battery. I have achieved seven
minutes of flight time using the DT700 motors and a
three-cell 2,200 mAh battery with this configuration, and
flight times of 12 minutes when using a three-cell
3,300 mAh battery.
The DT7xx extensions shown in Figure 2 have a larger
cutout and a different hole pattern for the motor mount.
Once you have added the boom extensions, your craft
will look much like the one in Figure 3. You will also find
that your craft won't be as agile as it was with the shorter
booms. It will however, be more stable.
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