Maxford USA Hughes H-1 V2 User manual

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ELECTRIC 50-INCH WINGSPAN
Hughes H-1 V2
INSTRUCTION MANUAL
Entire contents Copyright 2015 Maxford USA
Congratulations on your purchase of Maxford USA’s scale Hughes H-1 !
We invite you to enjoy the pride of ownership and the joy of flying this high
quality balsa, composite, and light-ply Almost-Ready-to-Fly aircraft.
TABLE OF CONTENTS
History of the Hughes H-1 ............ .........................2
Important safety precautions .................................. 2
Warranty, liability waiver, and return policy ......... 4
Special features of this Hughes H-1 ARF .............. 4
Specifications ......................................................... 5
Parts List ............................................................ 5
Assembly instructions ........................................ 5
Setup and adjustments ..................................... 12
Preflight checks ............................................... 13

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HISTORY
This is a scale model of the famous Howard Hughes H-1 from the Golden Age of
Aviation, the 20 year period between the end of World War I and the beginning of World
War II. Though originally designed simply for speed, the H-1 had many new features
that influenced the design of high- performance aircraft for years, including retractable
landing gear, gently curving wing fillets, rivets and joints that were flush with the
aircraft's skin, and ailerons that could be drooped when the flaps were fully extended,
improving lift along the full length of the wing for takeoffs and landings.
The original H-1 is now on display in the Golden Age of Flight gallery in the Smithsonian
National Air and Space Museum.
The 1st version of Maxford USA H-1 was released after nearly 2 years in development
and true to the original design, it is stable at both low and high speeds, features
concealed rudder and elevator controls, the new developed Max Cowling fiberglass
cowl, magnetic battery hatch, spring loaded tail wheel and optional retractable landing
gear.
Version 2 is the new improved version make this unique ARF even better than the 1st
version and now the retracts are included and fully installed.
IMPORTANT SAFETY PRECAUTIONS
TO PROTECT YOUR MODEL, YOURSELF & OTHERS
1. This product should not be considered a toy, but rather a sophisticated, working model that
functions much like a full-scale airplane. Because of its performance capabilities, this
product, if not assembled and operated correctly, could cause injury to you or spectators and
damage to property. Maxford USA provides you with a high-quality, thoroughly tested model
airplane kit with assembly instructions. However, the quality and capabilities of your finished
model airplane depend on how you build it, and your safety depends on how you use and fly
it. Any testing or flying of this model airplane is done entirely at your own risk.
2. Assemble the model airplane according to these instructions. We recommend that you do
not alter or modify the model, as doing so may result in an unsafe or unworkable model. In a

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few cases the instructions may differ slightly from the photos; in those instances the written
instructions should be considered as correct. If you have any question or concern about
these instructions, before you proceed with assembly of this product, contact us at (562)
529-3988, Monday through Friday, except national holidays, between 8:30 AM to 5 PM
Pacific time.
3. It is your responsibility to install the R/C system and other components in such a way that
this model airplane passes all applicable safety/range tests and that the power system and
controls operate smoothly and correctly.
4. Recheck the operation of this model airplane before every flight to ensure that all equipment
is still operating correctly and that the model has remained structurally sound. Also, before
every flight check all clevises and other connectors; do not fly without replacing any that you
find damaged or defective.
5. If you are not an experienced R/C pilot or have not flown this type of model before, we
recommend that you get the assistance of an experienced R/C pilot.
6. Throughout the lifetime of this model, use only the Maxford USA-recommended or same-
sized engine or equivalent electric power system and a new or well-maintained R/C radio
system and batteries recommended by the maker of the engine (or motor) and radio system.
7. LITHIUM BATTERY HANDLING & USAGE: WARNING!! If you use LiPo batteries, read the
battery’s instruction sheet or on-line information. Failure to follow all instructions could result
in permanent damage to the battery, its surroundings, and bodily harm! If you crash this
model airplane, check for battery damage. Do NOT use or charge a damaged Li-Po battery.
ONLY use a LiPo approved charger. (NEVER use a NiCd/NiMH charger!)
ALWAYS set the charger’s output to match the battery’s voltage and mAh ratings.
ALWAYS charge through the battery’s “charge” connector. (NEVER charge through the
“discharge” leads.)
ALWAYS charge in a fireproof location.
NEVER place on combustible materials or leave unattended during charge or discharge.
NEVER charge a LiPo battery in excess of 4.2V per cell.
NEVER discharge a LiPo battery below 2.5V per cell.
NEVER allow battery temp. to exceed 150° F (65° C).
NEVER charge at a current greater than 1C (for example, in the case of a 900 mAh battery,
that’s 0.9 amps).
NEVER trickle charge.
NEVER disassemble or modify pack wiring in any way or puncture cells.
KEEP BATTERIES OUT OF CHILDREN’S REACH
8. While this kit has been flight-tested to meet or exceed our rigid performance and reliability
standards in normal use, if you plan to perform any extremely high-stress flying, such as
racing or advanced aerobatics, or if you plan to install a larger engine (or motor) than
specified, you (the buyer or user of this product) are solely responsible for taking any and all
necessary steps to reinforce the high-stress points and/or substitute hardware that is more
suitable for such increased stresses.
9. This model may include fiberglass and/or carbon-fiber reinforced plastic parts that may
require some cutting or sanding. Carbon-fiber and fiberglass dust may cause eye, skin and
respiratory tract irritation. If you ever grind, drill or sand such parts, always wear safety
goggles, a particle mask and rubber gloves; never blow into such a part to remove fiberglass
or carbon-fiber dust, as the dust may blow back into your eyes.

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WARRANTY, LIABILITYWAIVER,AND RETURN POLICY
Maxford USA guarantees this kit to be free from defects in material and workmanship at the time
of purchase. All of our products have been inspected in our factory and are checked again when
shipped from our warehouse.
However, Maxford USA cannot directly control the materials you may use nor your final-
assembly process. Therefore, Maxford USA can NOT in any way guarantee the performance of
your finished model airplane. Furthermore, in purchasing this product, you (the buyer or user of
this product) exempt, waive, and relieve Maxford USA from all current or future liability for any
personal injury, property damage, or wrongful death, and if you (the buyer or user of this
product) are involved in any claim or suit, you will not sue Maxford USA or any of its
representatives.
If you do not fully accept the above liability and waiver, you may request a return merchandise
authorization number (RMA#) as explained in item 2, below.
If you think there is a missing part or any shipping damage, please read our after-sales service
and return policy as outlined below.
1. Inspect your order upon delivery for any shipping damage or missing part. If you find a
problem you must contact us within 10 days from receipt of your purchase by calling (562)
529-3988, Monday through Friday, except holidays, between the hours of 8:30 AM and 5 PM
Pacific time. During this telephone conversation, and with your support, we will determine
how to resolve your concern. (NOTE: Maxford USA Li-Po batteries are sold without warranty
and are not eligible for return or credit.)
2. To request an RMA#, call [phone], Monday through Friday, except holidays,
between the hours of 8:30 AM to 5 PM Pacific time. If we elect to issue you an RMA#, you
must clearly mark this RMA# on the outside of the package. (No return or exchange will be
authorized after 10 days from the date of your receipt of the product; any package delivered
to us without a Maxford USA RMA# is subject to being returned to the sender, as received,
with return postage payable upon delivery.) Returned merchandise must be in its original
condition as received from Maxford USA, with no assembly or modification, in the original
packing materials, complete with all manuals and accessories. Return shipping and
insurance charges must be prepaid by you, the buyer.
3. Returned merchandise that is accepted by Maxford USA for credit is subject to a 10% to
20% restocking fee (the final amount will be determined by Maxford USA upon receipt and
examination of the returned merchandise).
Return Address:
Maxford USA Distribution Inc.
15939 Illinois Ave., #C
Paramount, CA 90723
IMPORTANT: Print the RMA# issued by Maxford USAon the package near the above address.
SPECIAL FEATURES OF THIS HUGHES H-1
Fits full assembled in most vehicles.
All assemblies are precovered and required openings are predrilled and/or precut.
The cowl and tail fairings are prefinished.
Each aileron is separately operated by its own servo.
True to scale stick-on markings.
Large hatch provides easy access to the battery and radio equipment.
.

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SPECIFICATIONS*
Wingspan ............................................................................................................ 50 inches
Wing Area .................................................................................................... 490 sq. inches
Overall Length ..................................................................................................... 41 inches
Flying weight ....................................................................................................... 5 pounds
Wing Loading ................................................................................................ 23.5 oz/sq. ft.
Power System (Not included) .............. Maxford U35425 and U60 amp ESC or equivalent
Propeller (Not included) ...................................11x7e (or as-recommended for your motor)
Battery (Not included) ....................................................................4s, 3300-4000mAh LiPo
Radio system (Not included) ................................ Minimum of 5 channels, 4 micro servos
*(All dimensions and weights are approximate.)
PARTS LIST
Items included with this Hughes H-1
Precovered fuselage, wing panels, and tail surfaces.
Prepainted fiberglass cowl with dummy engine.
Prepainted plastic tail fairings.
Precut hinge openings and all needed CA hinges.
Retractable landing gear assembled and installed.
Composite wing joiner tube, installed pushrods, and all related hardware (except
those items normally supplied with servos and the electric motor).
Items you must supply to complete this Hughes H-1
5- and 30-minute epoxy glue, thin and thick Cyanoacrylate (CA) adhesives,
and a few common hand tools (such as long-nosed and diagonal or side-cutter
pliers, Phillips screwdriver, etc.).
A 600 to 750 watt brushless outrunner electric motor.
An Electronic Speed Control and propeller to suit your motor.
Four micro size servos, two 12-inch extensions, two short Y-connectors and a
5 or more channel radio control system.
A 4s LiPo battery.
ASSEMBLY INSTRUCTIONS
BEFORE YOU START:
Open the box and look over the parts. Check everything against the parts list and
make sure everything is there and undamaged. If anything is missing or broken,
contact Maxford USAat the address given on the last page of this manual within 10
days of receipt of the kit
If necessary, use a covering iron to go over the covering material on all of the parts
to eliminate any loose edges or air bubbles, then re-shrink the covering over all the
open areas using the iron or a heat gun.
Note: References to left and right are as if you were standing behind the airplane.

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INSTALLTHE AILERONS:
Push a T-pin or straight pin through the
center of each of the provided hinges.
The hinge slots are precut in the
leading edge of the ailerons and the
trailing edge of the wing. Push the CA
hinges into the slots in the ailerons so
that the pin is against the leading edge.
DO NOT GLUE THE HINGE IN YET.
Fit the ailerons by pushing the hinges
into the precut slots in the trailing edge
of the wing. NOTE: There are holes
drilled in the bottom of each aileron for
the control horns.
Bend the aileron down and then drip 2
drops of thin CAonto each hinge.
Remove the pins, then turn the wing
over and drip 2 more drops of thin CA
onto each hinge.
ASSEMBLE THE WINGS:
Remove the aileron servo hatches from
the bottom of the wing panels and
locate the small square hardwood
servo mounting blocks.
Position the blocks as needed for your
servo and glue them to the inside of the
hatch.
Use your transmitter to center the
servo. Use a long servo arm so that the
pushrod will not hit the wing surface
when it travels and be sure to install
the screw that holds the arm to the
servo.
After the glue has set, install a servo on the back of each hatch using the hardware
that came with your servos.
Attach an 12 inch extension to the servo wire and secure the connection by tying,
taping, or shrink tube so that it won't come apart.
Feed the end of the extension through the wing and out through the center hole of
the root rib. Install the hatch in the wing using the M 2x10 self-tapping screws

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provided.
Using a hobby knife, cut away the small
amount of covering between the holes in the
bottom of each aileron. Locate the 2 control
horns with the spikes on the bottom and glue
them into the ailerons with medium CA.
Re-center the aileron servo and then slip the
aileron pushrod through the outer hole in the
servo arm. Put an adjustable
pushrod connector in the outer
hole of the control horn. Adjust
the length of the pushrod by
sliding the pushrod through the
pushrod connecter until the
aileron trailing edge at the inside
end is level with the wing trailing
edge. Tighten the screw in the
pushrod connecter to lock in the
adjustment.
Install and adjust the aileron servo, control horn and pushrod on the other wing the
same way..
ASSEMBLE THE LANDING GEAR STRUT BRACES AND GEAR DOORS:
Locate the black painted plywood strut brace pieces and the two 5 1/2" long plywood
wedges. The gear should be
retracted for the first two steps.
Assemble the three flat pieces
as shown in the photo..
The wedge goes in between the
upright pieces with the wide part
at the retract end of the brace
assembly. Try this step first without glue. If the wedge is installed correctly, the
brace should be flush with the surface of the wing when it is pushed onto the gear
strut.
Glue the wedge in place and then, using epoxy, glue the brace onto the strut,
making sure that the brace is
flush with the surface of the
wing. CAUTION: Make sure
that no glue runs into the gear
retract mechanism while you
are doing this or the next
step. Use a minimal amount of
glue and make sure it has all set
before you put the wing into a
position that would allow the glue to run toward the retract mechanism. We

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recommend epoxy for these two
steps because it is less likely to
run and the set up time is more
predictable than CA.
Now extend the gear and glue
the plywood cap over the
exposed metal strut.
Retract the gear again. Locate
the two plastic gear doors and
cut off the bottom half of the
round part. Glue them to the
plywood strut brace.
Locate the fiberglass wing joiner
tube, test fit it into the wings to
make sure the wing tube
sockets are not obstructed.
Slide the tube through the
fuselage and test fit the wing in place.
INSTALLTHE MOTORAND ESC:
The twist-on "Max-Cowling" is a Maxford exclusive.
Notice the three small screws and one magnet near the
edge of the front of the fuselage. Test fit the cowl by
positioning it so that the magnet on the fuselage lines up
with the magnet in the cowl and then pushing the cowl
over the screw heads and twisting the cowl a few
degrees clockwise. If the cowl won't turn, loosen the
screws. If it goes on but is loose, tighten the screws.
Remove the cowl and the sliding
motor mount box. Mount your
motor onto the box, centered on
the X that is scored on the firewall.
Carefully measure back 5 3/8"
from the rear of the propeller and
put a mark on the side of the box.
Slip the box into the fuselage but
DO NOT GLUE IT IN YET.
Install the cowl and verify that the
prop clears the cowl by about 1/2
inch and that the prop shaft is near the center of the opening in the dummy engine.
If you chose to use a different motor and it is longer or shorter than the Maxford
U35425 that we used in the prototypes, you can slide the motor box back or forward
to make prop shaft come out nearer the center of the hole. When you are happy with
the fit go ahead and glue the box into the fuselage.

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Mount the ESC under the motor box by sliding it through the hole in the lower
firewall.
NOTE: Assembling the rear end of the fuselage is not difficult, but you must follow the
steps below in order to avoid problems.
INSTALLTHE STABILIZER:
Temporarily mount the wings on
the fuselage. Slide the
stabilizer into its slot in the rear
of the fuselage and measure
from the back of the wing to the
tips of the stab to make sure the
stab is aligned properly with the
wing. Draw a line along the
sides of the fuselage on the top and
bottom of the stab. Then pull the
stab back out and remove the
covering material from the center of
the stab between the lines. (Leave
1/8 or so of the covering inside the
lines so that the bare wood won't
show after you glue the stab in
place.)
Use epoxy to glue the stab into its slot, using the lines to position it correctly.
INSTALLTHE REAR FUSELAGE EXTENSION:
Locate the preassembled rear fuselage extension/ tail wheel, remove the tailwheel
and set it aside.
Put an adjustable pushrod connector through the hole in the right side of the
tailwheel steering arm.
Slip the top of the tail wheel strut through the hole in the stabilizer and glue the
extension assembly into the slots in the rear former. (See photo.)

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There is a 3" piece of 1/4" square balsa provided in the kit which you can use to
reinforce the lower joint between the extension assembly and the rear former of the
fuselage.
Locate the top rear fuselage extension and
The [ shaped wire elevator joiner. Slide the
top extension on with the elevator joiner
between the extension and the stabilizer.
Glue the extension in place. (See photo.)
INSTALLTHE FIN AND RUDDER AND
THE ELEVATOR:
Slide the vertical fin into its slot, draw a line
on each side and remove the covering as
you did on the stabilizer. Glue the fin in
place.
Slide the rudder onto the tail wheel strut and
install the rudder to the fin as you did the
elevators. You may have to loosen the set
screws on the steering arm and the wheel
collar so that the strut can move up or down
to set the rudder at the right height.
Don't forget to retighten the set screws.
Insert the elevator joiner wire into the factory
drilled holes and install the elevators to the
stabilizer using the same hinging techniques
that you used for the ailerons. NOTE: The elevator with the predrilled holes for the
control horn goes on the left side.

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HOOK UPTHE RUDDER/TAILWHEEL PUSHROD:
Install micro servos in the outer holes of the
servo tray in the fuselage using the
mounting hardware that came with your
servos.
Locate the shorter of the two long pushrod
wires. Slide the pushrod through the
preinstalled guide tube on the right side of
the fuselage and through the pushrod
connecter on the tailwheel steering arm.
Put the Z bend of the pushrod through the
outer hole of the arm on the right servo.
Center the servo and the rudder, then
tighten the pushrod connecter.
INSTALLTHE PLASTIC TAIL FAIRINGS:
Locate the top fairing and check its fit. Trim it if necessary to clear the rudder. You
can use the provided M2x10 self tapping screws to attach it, but we have found that
clear glossy tape is the easiest way.
Slip the bottom fairing over the tailwheel strut and trim the fairing as needed. The
part of the bottom fairing that is beside the elevators should slip under the top fairing.
Again, tape is the easiest way to hold the fairing in place.
Now you can reinstall the tailwheel.
HOOK UPTHE ELEVATOR PUSHROD:
Attach an adjustable pushrod connecter to
the outer hole of the remaining control horn.
Use the provided M2x10 machine screws to
attach the horn to the elevator.
Slide the remaining pushrod through the

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preinstalled guide tube on the left side of the fuselage and through the pushrod
connecter on the elevator control horn. Put the Z bend of the pushrod through the
inner hole of the arm on the left servo. Center the servo and the elevator, then
tighten the pushrod connecter.
Make sure the elevators and rudder are moving in the right direction.
ADD THE CANOPY:
If you wish, you can glue a
cockpit floor (not included) to the
bottom of the hatch and add a
pilot of your choice.
Glue the canopy in place with
"canopy glue" or contact
cement. Do not use CA
because it will leave a white firm
inside the canopy after it sets.
SETUPAND ADJUSTMENTS:
Plug all of the servos and the ESC into your receiver and mount the receiver in the
area behind the battery tray. Use Y-connectors for the ailerons and retract landing
gear.
Install your battery (do not install a propeller yet) and use your transmitter to re-
center all of the servos . Adjust the pushrod connectors on the ailerons, rudder and
elevators so that all of the control surfaces are centered.
Set the initial control travels as follows: (Measured at the widest point of the control
surface.)
High Rate Low Rate
Ailerons 5/8" up 5/8" down 80%
Elevator 1/2" up 1/2" down 70%
Rudder 1 1/4" left and right 70%
If you use exponential, add 25% on the high rates.
Install the propeller and set the Balance Point (C/G) at 3 1/2 to 3 3/4 inches behind
the leading edge, at the side of the fuselage, with the stabilizer level to the ground.
NOTE: The Hughes H-1 is a short nosed airplane. You will need to mount he battery
as far forward as possible and you will probably need to add 2 to 3 ounces of lead to the
front of the motor box.
PRE-FLIGHT CHECKS
1. Make certain that all screws, clevises and other connections throughout the air frame are secure.

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2. Double-check the control travel directions of the throttle, ailerons, elevator and rudder.
3. As with all radio-controlled model airplanes, this model must pass the radio range ground check
recommended by your radio’s manufacturer, or you may not safely fly.
4. Get into the habit of turning on your transmitter and moving the throttle to minimum before plugging in your
battery, and operate your electric power system according to the manufacturer’s instructions.
REMINDER: An important notice to our customers!
THIS PRODUCT IS NOT A TOY.
The quality and capabilities of your finished model airplane depend on how you build it.
Your safety depends on how you use and fly it.
Any testing or flying of this model airplane is done entirely at your own risk.
We thank you for choosing Maxford USA and
we sincerely wish you many happy landings!
Manufactured by:
MaxfordUSARCModelMfg,Inc.
Distributed by:
MaxfordUSARCDistributionInc.
15939IllinoisAve.#C
Paramount,CA90723
Telephone (voice) ............................. 562-529-3988
Fax .................................................... 562-562-6988
Toll free (orders only) ...................... 866-706-8288
Web site: www.maxfordusa.com
Order replacement parts, servos, batteries, gas engines, brushless motors,
electronic speed controls,
and a wide variety of other high-quality RC hobby items online at
www.maxfordusa.com