CORVUS 70E V2 User manual

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Corvus Racer 70 Electric V2
Instruction Manual

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Dear Customer,
Thanks for purchasing this newly designed CORVUS 70E V2 aerobatic RC airplane. With an
approximate flying weight of 5.5 Lbs., the new Corvus was designed for IMAC and free style flying. It
was developed with unique appearance and extreme flight performance in mind. The new Corvus 70E
V2 was covered with genuine Monocote film, and equipped with good quality accessories, including
carbon fiber wing tube, anodized 6061 aluminum landing gear or carbon fiber landing gear as an
upgrade option. We hope you enjoy this plane as much as we do.
The new V2 version of CORVUS 70E has the following improvements from previous versions:
•Control surfaces is larger than V1 version. Up to 50 degrees of throw on all control surfaces.
Best for more vibrant aerobatic flight.
•Improved wheels with more durable materials, and filled with rubber.
•High quality cap head screws included.
•Improved ball link assembly.
•Stainless steel wheel axle.
•Newly designed fiberglass control horn assembly
•Side Force Generators (SFG) included
•Air exit opeing behind the rudder servo for electric set-ups.
•Longer tale moment improves tracking of the airplane, giving it rock solid precision flight.
SAFETY ISSUES OF RADIO CONTROL FLYING MODELS
With radio control aircraft, like any hobby or sport, there are certain risks. The operator of these
models is responsible for these risks. If misused or abused, you may cause serious bodily injury and/or
damage to property. With this in mind, you will want to be certain that you build your model carefully
and correctly. If you are not an experienced flier, have your work checked and ask for help in learning
to fly safely. This model aircraft is NOT a toy and must be operated and flown in a safe manner at all
times. Always perform a pre-flight check of the model including all control surfaces, proper function
of the radio gear, structure, radio range, and any other area relating to the safe operation of this aircraft.
Models are not insurable but operators are. You can obtain coverage through membership in the
Academy of Model Aeronautics (AMA). For an AMA information package call 1-800-435-9262, ext.
292 or visit the AMA website at "www.modelaircraft.org"

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By the act of using the final assembled model, the purchaser/operator accepts all resulting liability
ARF MODELS WARRANTY AND RETURN POLICY
We guarantee that the plane is in perfect condition at purchase. The warranty will be voided after
modifications and usages. If you have any questions or find any issues, please contact the distributors
in your area. For US customers, please contact General Hobby. Their website is
www.generalhobby.com. Their phone number is 909-581-8873. Customers in other areas please
contact the sellers you purchased it from.
Specifications and Recommended Power Setup
•Wingspan: 59"(1500mm)
•Length: 57"(1450mm)
•Wing Area: 741sq in (47.8sq dm)
•Flying Weight: 4.8-6 lbs. (2200-2700g)
Electric Power Setup：
•Hacker A40-10S with 4S 3300-4200mAh, 14x7 prop
•Hacker A40-12S with 5S 3000-3700mAh, 13x6.5 prop
•Hacker A40-12S with 4S 3300-4200mAh, 14x7 prop
•Hacker A40-14S with 5S 3000-3700mAh, 14x7 prop
•DUSKY XM5050EA-9 6S 3300-4400mAh, 15x8prop or other 1000-1200 watt, 300g class
electric motors
•ESC：70-100A
•4 or 5 Mini size high torque servos, Hitec HS5245 or 7245 recommended
*please note that you may 1 or 2 servos for elevators
•Aircraft radio and receive of your choice, 4 channels minimum
Features and Photo Gallery
•Newly designed structure
•Aerofoil tail wings
•Two pieces removable wings
•Carbon fiber wing tube
•PVC canopy

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•Larger ailerons and elevator designed for extreme 3D aerobatic flying
•Air exit opeing for cooling
•Side Force Generator’s (SFG) Included
•Canopy extended into cowl for easier battery access

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•Quick release canopy latch
•Light weight C.F. tail wheel assembly
•High-quality durable rubber wheels
•Improved new wheel axle (stainless steel)

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•Landing gear options : anodized 6061 Aluminum or carbon fiber
*Carbon fiber *Anodized 6061 aluminum
•Honeycomb Board carton packing for safer transportation

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Scheme A: white/yellow/black

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Scheme B:red /white/ / black

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Items Required to Complete This Model
•1000-1200 Watt, 300g class electric motor
•70-100A ESC
•4 or 5 mini size high torque servos (Hitec HS5245 or HS 7245)
*1 or 2 servos for elevators
•Appropriate servo arms
•Servo wire extensions. two 6”, two 12”
•Appropriate Lipo batteries (6S 2600-3300mah)
•Receiver of your choice (minimum 4 channels)
•RCradioofyourchoice
Shop Supplies/Tools
•Covering Iron and heat gun
•Hobby tools such as screwdrivers, hobby knife, drill and drill bits, piers, etc.
•Thick and Thin CA adhesives
•30 minute Epoxy
•Isopropyl alcohol
•Ruler or tape measure
•Blue thread-lock or equivalent
•Adhesive backed Velcro and Velcro strap for battery retention
Note: please read all the instructions before you begin construction. Handle the parts of this kit with
care so you do not damage any of the structure or covering. Inspect all the parts for any shipping
damage and report any issues to as soon as you can. Make sure you have a flat and sturdy workbench
and follow all safety advice for the tools and adhesives you plan to use.
Aircraft Covering
Varying temperatures and storage delays can cause covering material to loosen over time and
transportation. We recommend lightly going over all the covering with a covering iron set at
medium temperatures. Be sure to use a soft cover over your iron so you do not scratch the covering
surface. Be sure you go over all seams and edges of the covering to assure it is secure to the airframe

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and other covering. Be careful not to apply too much heat or you may cause bubbles or damage to the
covering. A heat gun may also be used along with a soft cotton cloth to shrink and adhere the
covering. Again, be extremely careful when using a heat gun.
Some modellers prefer to seal the hinge gaps using strips of appropriate covering or clear trim tape.
We have found this to be helpful with models intended for higher speed flight or models with unusually
large hinge gaps. Aircrafts that utilize a very tight double beveled hinge line and do not normally
require this step. Sealing the hinge gaps is therefore left as an option formodellers.
Please verify the accessories before assemble:
•4 fiber glass servo horns: 2 single horns for ailerons, and 2 for elevators (if you choose to use
single servo to control elevators, you only need to install one control horn and joint the
elevators with a fiber glass bar, please see instruction in “Elevators Assembly” section). 1 dual
horns for rudder.
*There is a layer of protection film on the horns. Please remove the film before installation.
•Pushrods: 4 2x65mm pushrods for aileron & elevator.

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•Pull-pull hardware set for rudder
•Ball links: 8 for aileron and elevator
•4 Servo extension safety connector clips

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•Main rubber wheels：2 Pcs
•Stainless steel Axle kits: 2 Pcs
•Tail wheel assembly
•Side force generators (mounted with four 3x12mm Hexagon bolts & 2 Washers)

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•4 (3x16mm) hex-head bolts for landing gear mounting
•Screws for cowl: 4(3x12mm) tapping screws
•Motor mounting hardware set
•3 Hex keys

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Construction
1. Wing Assembly
1.1 Locate two wing panels with ailerons, and two set of control horns and base plates.
1.2 Locate the slot for control horn on aileron, remove the covering over the slot with heated
soldering iron or sharp hobby knife, and make sure you do it on the bottom side of the aileron.
Insert control horn into base plate then into the slot, trace the edge of base plate with hobby
knife then remove the underlying covering.
1.3 Use some fine sandpaper to roughen up the root of control horn where will be glued into the
slot.
1.4 Fill the slot and coat the root of control horn and the bottom of base plate with 30 minute epoxy,
insert the horn into the slot, press it down firmly. Wipe off excessive epoxy with alcohol wipes.
Set aside until cured.

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1.5 The slots for CA hinges are pre-cut. Insert CA hinges half way into the hinge slots on aileron,
apply a drop of thin CA to secure the hinges. Then insert all hinges into slots on the wing at
once, align aileron with the wing, move the aileron up and down a few times to reach the
minimal hinge gap while still allowing full deflection of the aileron. When satisfied, apply
more think CA on both top and bottom sides of each hinges.
1.6 Cut the covering from the aileron servo slots from corner to corner and iron down inside the
openings. Connect servo wire extensions to your servos and secure the connections with the
supplied clips. Feed the servo wires into the wing and out the root. The screw holes for servo
mounting are laser pre-drilled, it is advisable to apply some thin CA to strengthen them, Install
the servos and screw firmly in place.

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1.7 Use your radio to set the centers of each servo and then assemble and adjust the length of each
control rod. The servo arm should be as close to perpendicular to the control rod as possible
while the aileron is at neutral. Double check all screws, bolts and nuts to assure proper
installation and operation without binding.Once satisfied, permanently attach the ball links to
the servo arms and horns with the supplied screw and nut.
1.8 Check the final radio operation of the ailerons and make sure there is no binding or servo
fighting of each other. Also check to make sure all linkage bolts and nuts are secure.
1.9 Repeat this process for the other wing half.
2. Landing Gear Installation
2.1 Locate the landing gear set
2.2 Install the wheel axles to the landing gear and tighten the nylon-insert lock nut. Install one
wheel collar onto the axle. Use a second wheel collar as a guide to leave a gap on the inboard
of the axle. Use a small drop of thread-lock and tighten in place. Slide the wheel onto the axle
and install a second wheel collar also using thread-lock on the set screw.

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2.3 Fit the wheel pant in place and install using the two supplied screws. Use thread-lock to secure
the screws in place. Repeat the above steps for the other main gear.

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2.4 Bolt the main gear to the bottom of the fuselage using the supplied bolts
3. Elevators Assembly
3.1 Find the control horn slots on bottom side the elevators, use the method described in 1.2-1.4 to
install control horns for elevators. Please note that if you are using dual servos, you need to
install horns on both elevator halves, if you are using signal servo, install horns on one
side only.
3.2 Remove covering over the hole for horizontal stabilizer on fuselage. Removing covering on the
central part of horizontal stabilizer is recommended for better glue bonding. Insert the
horizontal stabilizer into fuselage, make sure it’s centered. Apply thin and gap-filling medium
CA to glue it in place.

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3.3 Glue the CA hinge for the elevator the same way as the main wings
3.4 There is an option to use one servo or two servos for the elevator. If using one servo, the
twohalves of the elevator need to be connected by the included fiberglass bar with glue as
shown below. The picture is for illustration only. Actually, the connection of the 2 parts needs
to be performed before the hinges are connected.
3.5 Locate the slots for elevator servo(s), remove covering. Connect wire extension to your servos
before feeding the wire into fuselage. Install servo(s) with screws supplied by servo
manufacturer.

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3.6 Use your radio to set the servo center position and install the large control horn onto the servo.
Assemble the control rod and ball links and adjust the control linkage for proper geometry.
When satisfied, screw the ball link to the servo arm and control horn. The servo arm should be
as close to perpendicular to the control rod as possible while the elevator is at neutral. Double
check all screws, bolts and nuts to assure proper installation and operation without binding.
4. Rudder Assembly
4.1 Locate pull-pull linkage set for rudder.
4.2 Install the double-arm fiberglass control horns in the same way as you did the elevator and
aileron horns.
4.3 Connect CA hinges for rudder.