FMA - HydroHawk Suppliment Manual
Please read this entire manual suppliment first before starting
the assembly of your FMA HydroHawk ARF.
We have found several improvements for the positioning of
components like the battery pack and motor.
Cutting the foam canopy for the improved battery placement
is easiest done before gluing it to the deck.
In the Box:
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Box Top with Decals
& Manual
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ARF Parts Grouped &
Wrapped
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Pre-Installed Floats
& Runners
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Parts from the Box:
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Top of Boat
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Brushless Power System
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Bottom of Boat
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Pre-made Control Surfaces
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Top Elevator and Stab
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Decals
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Manual and Foam Canopy
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The power system was tested using two different size Cellpro
Kokam packs. The packs measured as follows with the stock GWS 8x4.3 prop.
Assembly:
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The slot in the foam
canopy may need to be cut longer as shown above.
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Note:
The canopy slot may need to be lengthened as
shown to move the motor mount and battery forward to obtain the proper
CG of 3.0".
This longer slot may already be cut on your
version.
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The foam slot shown
above is cut for proper CG of 3.0"
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Position and insert
elevators, glue with thin CA on each side
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Cut away covering using
a sharp razor knife
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Glue foam canopy to
body using 5-minute epoxy
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Position the lower elevators using the supplied hinges and then secure in
place with several drops of thin CA on both sides
to soak the fiber hinge material. Epoxy the foam canopy onto the main body.
Before doing so, you may want to test fit
the motor mount assembly and cut away a thin amount of inner foam, if needed.
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Epoxy the 3 Vertical
Stabs
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Attach rudder hinges
using thin CA
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Epoxy the top stabilier
in 3 places
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Epoxy the top stabilier in 3
places
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Epoxy the vertical stabilizers in place making sure that they are at right
angles to the main body.
Attached the rudder using the supplied hinges and soak with thin CA
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Test fit the motor mount
and cut away inner foam wall, if needed
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Attach the motor mount
using either white glue or epoxy
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Secure the motor as
shown on the stick with the two supplied screws
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The motor mount can be glued with either white glue or epoxy.
The inner foam wall of the canopy may need to be widened with a razor knife
before the motor mount fits.
Press the motor in place on the stick and secure with the two supplied screws.
Note that the motor assembly must be positioned above the stick for improved
flying performance and prop ground clearance.
Linkages:
Note that the left and right pairs of elevators require an elevon
mix either at the receiver using a tiny external device
or at the transmitter if it has an elevon mix feature. The
mix allows the four elevator control surfaces to act as both
elevators and ailerons; called elevons. The elevon mix is required
to fly this model properly.
When viewed from the rear of the model, all 4 surfaces go up
for up elevator (down stick).
For right aileron stick, both right surfaces on the top and
bottom decks go up and the left two surfaces go down. This is reversed for
left aileron stick.
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Mount the rudder linkage
and servo
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Mount the right elevon
linkage and servo
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Position M5 receiver,
switch, motor, and ESC as shown
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Connect top deck to bottom
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Top deck linkage uses
"Z" bend
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Apply decal as shown
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The M5v2
receiver fits nicely in the rear of the foam canopy
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The servos were mounted to a small piece of balsa using servo
tape and then the balsa was CA'ed to the body.
The M5 v2 receiver fits nicely in the rear of the canopy with
the antenna wire routed through the rudder servo opening.
The three brushless motor wires are secured to the motor post
which holds the ESC in place from the rear. The ESC is held from the front
by the power connector into the body of the boat.
The top deck linkage uses the "Z" bend end of the
metal rod after first removing the quick link.
The ESC ends were sealed with silicone paste to prevent water
getting in.
Finishing the HydroHawk:
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The Cellpro 3-cell 910mAh
battery pack slides into position
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Final Steps
The battery position shown on the left works
fine and is easiest to build.
The battery position shown on the right improves
flight performance as the weight is closer to balanced on both sides.
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Note new battery and
motor positions for improved flying performance.
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FMA HydroHawk
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Ready-To-Fly
The components fit very well and the proper
CG of 3.0" was right at the step in the floats.
The FMA HydroHawk ARF was ready to fly at 15oz
with the 3oz Cellpro Kokam 910mAh pack.
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FMA HydroHawk
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Note: If the 3.0" CG cannot be obtained, add 1/4oz lead weights
to the tips of the foam floats. The weights can be glued in flush
with the inside surface of each float near the tip.
Test Flying:
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HydroHawk
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Video
1 (4.5meg)
The first video was taken during 10mph winds.
The HydroHawk needed to keep the speed up so the wind wouldn't push
it around.
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HydroHawk
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HydroHawk
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Video
2 (6.7meg)
The second video was taken in calmer conditions
with about 5mph winds. It was easier to slow fly the HydroHawk and
we had a blast taking off the grass and performing loops and rolls.
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HydroHawk
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HydroHawk Rocks!
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We are very happy with the performance of the FMA HydroHawk. It flies great
and is very rugged. Another great value from FMA Direct!
