RCU Review: Wild Hare R/C Edge 540T ARF - 40cc

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    Contributed by: Richard Poe | Published: May 2006 | Views: 74275 | email icon Email this Article | PDFpdf icon


    Manufacturer Info

    Wild Hare RC
    8608 Doral Ct.
    Flower Mound, TX 75022

    Ease of Assembly
    Aerobatic ability

    • Great looking scale plane, light weight and strong.

    • Wing tube developed a slight bend after multiple aggressive flights and needed to be replaced.


    A Note from Wild Hare:
    I hear it all the time. "what we need is a high performance aerobatic plane that can do all the 3d stuff like torque rolling and walls that I can throw in my car. I like glow engines but I can't find anything in that size that's truly professional grade".
    Well here it is. Most everyone reading this is probably familiar with Wild Hare's line of 28% scale airplanes. These planes were designed to be just like the larger competition planes with removable wings and stabs on aluminum tube spars, capable of doing everything a 40% plane can do.

    But as popular as they have been (and you can see them at just about any flying field) some guys just can't afford $1,500 to $2,000 for an airplane.

    So we shrunk the 28% Edge down to 25% and took out some of the stuff that was not needed for a glow powered plane and what we've got now is a 3d and IMAC capable Edge 540T ARF kit that can be purchased for under $320.

    The Edge 540T described above is gentle and easy to fly in "normal mode" or on low control rates. The light weight and large wing area make this plane as easy to land as anything on the market. You shouldn't close your eyes landing, but you probably could!

    In 3D mode on high rates it's as capable as anything flying. Of course larger planes have an advantage in being easier to see, but none of them can do more than this plane will do.
    Rolling harriers, walls, flat spins, tip spins, waterfalls, all are within the reach of this new Edge. With a 2-pound glow engine this plane weighs in right at 11 pounds. This is a featherweight aircraft yet strong enough that it won't fold up at the first rough landing. It shares most of its structural design with our larger 28% planes.

    And IMAC type aerobatics are a snap, even at the advanced level. As we said before, larger planes have the advantage in visibility but this plane is one up when it comes to fitting in your car.

    It has counterbalanced and oversized elevators and rudder. Its sheeted foam wings are extremely light yet brutally strong. With the wings on it has a roll rate that can be so fast it's just a blur. With the wings and stabs off it can be carried in even the smallest vehicles.

    Suitable engines that have been used are Thunder Tiger 1.20, Super Tiger 2300, OS 1.60, YS 1.20 4 stroke. Other good choices are Saito 1.50/1.80, OS 1.20 FS, etc. There are also several small gas engines that may be suitable such as the 3w 24/28 or MVVS 1.6, but these have not been tested yet.

    Packaging: Each piece comes individually wrapped in a layer of thin foam covered with a clear plastic wrap. Every part was well packaged and neatly placed. No damage was sustained to any of the parts or pieces during shipping.

    The Edge has a great scale look and colorful covering scheme. The quality of the parts and covering look really good. The cowl and wheel pants are rugged and have a painted finish.


    Model: Wild Hare Edge 540T 25%
    Distributed by: Wild Hare R/C
    Web site: www.wildharerc.com
    Price: $319.00
    Hardware Kit: $50.00
    Wingspan: 73"
    Length: 70" rudder to spinner
    Weight: 11-12 lbs
    w/ Brison: 13.2 lbs
    Wing Area: 1090 in2
    Prop used: MSC 20 x 8
    Radio used: Futaba 7C
    Battery used Receiver: 1500ma NiMh 6volt
    Battery used Ignition: 1500ma NiCad 4.8volt
    Recommended Engine: 1.20-1.60 2-stroke glow, 1,20-1.80 4-stroke glow
    Engine used for review: Brison 2.4ci & OS 1.60
    Muffler: J&H wrap around (Brison) / Pitts Muffler (OS)

    Servos used:

    • 2 -Hitec 6635HB - 83oz (1 for each aileron)
    • 2- Hitec Digital 5475HB - 76oz (1 for each elevator half)
    • 1- Hitec Digital 5945MG - 181oz (Rudder)
    • 1- Hitec HS81 - 42oz (throttle)

    Receiver used:

    • Futaba PCM 1024


    • Balsa sheeted foam removable wings mounted on 1" aluminum tube spar.
    • Wings are secured to the fuselage by 2 screws through the side of the fuse into a blind nut mounted in the wings.
    • Removable aluminum h-stab tube.
    • Robart style pin hinges.
    • Aluminum landing gear mounts on aircraft ply plate with aluminum angle reinforcement.
    • Aircraft ply firewall mounted on motorbox.
    • Wing tube engaged by motor box sides for rigid stress carrying structure.
    • Fiberglass cowl and wheel pants.
    • Tail wheel assembly included.
    • Fuselage built up from balsa and lite ply.
    • Covered in Oracover/Ultracote.
    • Two tank mounts support both non-pumped and pumped engines.
    • Available hardware kit completes the plane with top quality hardware.
    • Very simple assembly, requires only a few hours and simple tools.
    • Tail mounted dual elevator servos work off simple Y cable.
    • 4 channel radio is required.

    Items purchased separately:

    • 1 Du-Bro Fill It fueling system (Cat# 840) filler for fuel tank
    • 1 Du-Bro 20oz fuel tank (Cat #420)
    • 1 Du-Bro Gas stopper (Cat #400)
    • 1 Du- Bro Large Scale in-line Fuel Filter (Cat #341)
    • 3" Great Planes Spinner
    • 1 package Du-Bro Super Lite Wheels (Cat #275SL)
    • 1- 16" servo lead extension for the elevator
    • 2- 12" servo lead extensions for the ailerons
    • 1- short Y-harness (to join the elevator servos )
    • 2- 6" extensions from Ch 1-6 from the receiver for aileron plug-in
    • 1-12" extension for the throttle mounted behind the firewall
    • 2 Hitec Heavy Duty switch harness system
    • 2-Du-Bro universal Kwik-switch Mount (Cat #203)

    Optional items purchased separately:

    • 2-Du- Bro Adjustable control horn (Cat# 913)
    • Du-Bro Ball Links #900
    • Du-Bro heavy-duty control Horn # 882
    • 1- 36" Carbon Fiber rod for Linkage
    • Sullivan Tail Wheel
    • 2- (4-40 x 12") long threaded rods for linkage hookup

    Getting Started


    Wing- Top LS
    Wing- Top LS
    Wing- Top RS

    Wing- Top RS
    Wing- Bottom LS
    Wing- Bottom LS

    Wing- Bottom RD

    Wings and Elevator Tubes
    Elevator and Stabilizer
    Top LS
    Elevator and Stabilizer
    Bottom RS

    Elevator and Stabilizer
    Top RS
    Landing Gear

    Wheel Pants
    Hinge the control surfaces:

    Robart hinges are supplied for all the control surfaces and are easy to install. I used 30-minute epoxy for gluing all hinges. Make sure you lubricate the knuckle of the hinge so the epoxy won't penetrate into the knuckle. Light oil or petroleum jelly will do.
    Before you begin gluing, test fit all the surfaces to make sure the hinges seat properly in both control surfaces.

    The best method for installing the hinges is in two steps. Glue the hinges in one side of all the surfaces. Wipe off any excess glue that bulges around each hinge before it sets up. Then let the glue dry before gluing them into the other side of the surface.

    When you glue the hinge into one side of the surface, you also need to make sure the knuckle is in proper alignment, meaning that when you deflect the hinge 45 degrees or more, it will be perpendicular (Square) to the hinge line. The control surfaces at the hinge lines are beveled allowing you a snug fit with lots of deflection.

    I seam seal the hinge line of both top and bottoms of each surface. The advantage of sealing the seams will reduce the chance of flutter and eliminate any air lost through the hinge-line gap for optimal performance of the control surfaces. It also allows you to leave a wider gap at the hinge line, to achieve more deflection if desired. Another nice feature of seam sealing is it's easy to keep the hinge line clean.

    I seam seal the hinge line using ¾"-1" strips of clear ultracote. I fold the ultracote along the length of the hinge line, ironing it to each side of each bevel while the surface is fully deflected. Repeat the same procedure for each side. Using clear ultracote is virtually invisible and won't block different color patterns that flow into the hinge line. You could also use monocote of the same color and type as your covering to achieve the same results.

    Mount the Canopy:

    Cut the canopy mold for proper fit and attach with glue, tape, or screws. Use whatever method is most suitable for you.
    It's a good idea to attach the canopy while the hatch is mounted to the fuselage. This ensures everything will line up and fit properly.

    Mounting the horizontal Stabilizer:

    Trim the covering around the holes in the fuselage for the spar tube and the retaining bolts on each side. Insert the spar through the fuselage and slide on the stabilizers.

    The stabilizers are secured in place by (2) 4mm bolts, washers and lock washers.

    Install control horns and linkage:

    MVC-041S-2.JPG (38407 bytes)

    Install all your control horns and hook up linkages in the wings, ailerons and rudder. I installed Du-Bro horns and linkages because of personal preference. The optional hardware kit you can purchase separately would work just fine. For my push rods I used 4-40 threaded rods with a carbon fiber tube, slid over the threaded rod for added strength and looks.

    MVC-023S.JPG (37381 bytes)
    MVC-015S.JPG (38359 bytes) MVC-035S.JPG (38998 bytes)

    The fuel tank was mounted as close to the CG as possible and tie strapped into place. A tank support was added between the fuselage sides to support the front of the tank.

    Here's a look at the ignition switch, along with the fuel dot location. The receiver was installed on the underside of the fuselage support at the back of the canopy.

    The Wings:
    The wing is secured to the fuselage with (1) bolt and washer for each wing.
    Optional: As added piece of mind, I drilled small holes through the wing alignment dowels and used a washer and retaining clip for added holding power. With the retainer clip you could probably eliminate the bolts for an quicker wing hook-up.

    The CG was set at 5" back from the leading edge of the wing. In order to achieve a 5" CG, the battery had to be mounted in the tail section of the fuselage. A hole was cut in the covering and the battery was placed in the hole and secured by foam padding. A new piece of covering was ironed on over the hole.

    Engine Testing

    Engines tested

    The O.S. 1.60 was installed prior to the Brison. This engine provided loads of power. That?s the way I like it. The cline regulator was also used for this setup because the fuel tank was mounted near the CG next to the wing tube. The engine fit completely within the cowl. The performance of the 1.60 was very good. You had unlimited vertical with more than enough power for 3D and less engine weight than the Brison. The only thing I didn?t like about the O.S was the sound of the 2 strokes. I decided to convert to Gas and try the Brison, after I read on RC Universe forums that someone with favorable results had done it. Owning a few other Brison that have run great over the years made this a no brainier.

    The Brison fit completely within the cowl and was easier to mount than the O.S. The biggest concern switching to the Brison was how it would affect the performance of the plane with the added weight of a gasser. My concerns were put to rest after flying the plane. In my opinion the sound and power of the Brison are a great match for this plane. The Brison engine preformed flawlessly from the start.

    The Engine:

    Brison 2.4 Gas engine - Brison now offers the 2.4 with Automatic timing advance.

    The engine used in this review has the Mechanical throttle coupled advance.

    Recommended Fuel

    higher octane rated gasolines between 91 through 93.

    Fuel Used

    Premium Gas, 93 Octane

    Recommended oil and Mixture

    ratio of gas to oil depends on the oil type, such as petroleum or synthetic based. Brison recommends a 64:1 ratio for petroleum-based oils. (2 ozs. of oil to 1 gallon of gasoline.) Synthetic oils are much lower, 80:1. (1.6 ozs. per gallon.)

    Oil Used

    Klotz 2-Cycle Synthetic mixed at 80:1 (part# KL-310)

    Technical Specifications:


    Brison R/C Engines Inc. is proud to announce the addition of "AutomaticTiming Advance" to the 2.4ci/40cc engine. The improvement will eliminate the need of 20 moving parts and will greatly improve the reliability and longevity of the engine. We at Brison are ever searching to bring the modeling community the very best in R/C products, the addition of "Automatic Timing Advance" is a major step in the right direction. Look for many more innovations from Brison in the near future.

    Brison (2.4 ci/40cc) Specifications






    Prop Sizes





    2.75 lbs

    21 lbs

    18X10 18X12

    20X8 20X10


    All Engines Include:

    • NIKASIL Lined Cylinders
    • Custom made, one piece, steel cantilever crankshafts with 3/8-24nf thread (except 4.8 & 6.4 c.i. twins)
    • High quality ball & needle bearings throughout
    • Electronic spark advance
    • Detachable engine mount
    • Walbro pump type carburetor
    • Cases drilled and tapped for smoke
    • Twins all have three main bearings
    • Two year conditional warranty on parts & labor
    • Three year warranty on crankshaft

    Muffler used:


    Part Number



    J & A


    Brison 2.4


    Mounting the engine

    The firewall is equipped with right thrust built in to the motor box.

    The cowl has (4) pre-drilled mounting holes and adjoining blind nuts installed in the fuselage. Proper mounting of the engine is critical for the output shaft to exit the center of the cowl. The best way to ensure proper alignment is to temporarily mount the plane vertically to the side of a 6 foot stepladder or whatever method you may find easier. This way you can set the engine on the face of the firewall, mount the cowl with the supplied screws, and move the engine within the cowl so the shaft is perfectly centered within the cowl. Then carefully remove the cowl and mark the location of the engine mounting holes.

    Plywood shims ¼ inch thick were needed behind the mounting plate to set the 1/8 inch clearance off the cowl to the back of the spinner plate.

    MVC-009S.JPG (38336 bytes) MVC-011S.JPG (37678 bytes)
    MVC-006S-1.JPG (38062 bytes) MVC-004S.JPG (38759 bytes)

    Futaba 7C Setup

    CH 1

    CH 2

    CH 3

    CH 4

    CH 6
















    EPA Up-Down



    57%- 73%



    EPA Left-Right




    113%- 97%


    Sub trim Value






    D/R - Low






    D/R - Medium






    D/R - High






    Expo U/D on Low/Rate






    Expo L/R on Low/Rate






    Expo U/D on Med/Rate






    Expo L/R on Med/Rate






    Expo U/D on High/Rate






    Expo L/R on High/Rate






    Throttle Cut (Switch F)


    FLAPRN- > ON (activated)


    DIFF> 0%

    ELE-FLP (Spoilerons)

    Spoilerons activated by

    Switch (E)

    RT> -100%





    Deflection in inches:

    Low Rate

    ¾? U&D

    1-1/8" U&D


    2-7/8" L&R

    Deflection in inches: Medium Rate


    2-1/4" U&D


    Deflection in inches: High Rate

    1-3/8? U&D

    3-3/4" U&D


    6-1/8" L&R

    CG: 5" Back from leading edge of wing

    Timer: 15 minutes (Count down activated after you pass 1/8 throttle SW>3^)





    Deflection in Degrees:

    Low Rate

    18 degrees U&D

    16 degrees U&D


    22 degrees L&R

    Deflection in Degrees: Medium Rate


    34 up

    38 down


    Deflection in Degrees: High Rate


    degrees U&D

    48.5 up

    53 down


    44 degrees L&R

    Test Flying

    Flight Performance:

    Initial take off on low rates was uneventful and didn?t require much runway considering I had snow skies on the plane instead of the wheels. The reason the snow skies were used is the condition of our field is quite bad this year and has claimed a lot of landing gear from our early season flyers because of the rough field conditions. The skies allowed the plane to glide across the rough conditions without claiming my gear so we could at least provide the video.

    I?m sure the drag of the skies had some small effect on the flight, but you wouldn?t know it from the great aerobatics? the plane offered.

    On low rates it flew like a trainer, switch to high rates and you have a great 3D performer. While doing large loops the plane tracked pretty good with very little correction needed. Hammerheads were a breeze.

    Inverted flight revealed the CG is right where I like it. The plane had a very slight tendency to fall towards the canopy. The MSC 20 x 8 prop is a great combo for this engine and provided unlimited vertical and good braking on the down lines.

    Snap rolls were responsive and quick. Blenders were easily done. I noticed dropping the power down to an idle once you enter the inverted flat spin in the blender provided a better flat spin than with added power.

    Knife-edge flat spins were good, but I was looking for a tighter spin around its axis, which could probably be achieved with a little more elevator throw (My elevator throws are maxed out right now)

    Knife-edges are very good with little coupling. I was able to, for the first time, perform some Hi Alpha knife- edges. The only limits on doing some slow, Hi Alpha knife-edges were my lack of experience performing them. With a little more practice I will be able to add that maneuver to my list of others.

    Upright harriers were ok. I did get a little wing rocking while small amounts of power were applied. The harrier had less wing rocking if you let it drop down to the deck while maintaining an idle or very little power.

    Inverted harriers were better than upright ones. There was very little wing rocking that was easily controlled with the ailerons while the heading of the plane was controlled with small amounts of rudder input.

    Rolling circles are really impressive when you get the timing locked in. I never seem to get tired of doing a rolling circle, when your timing falls into place, and the roll rate is perfect giving you a smooth steady circle.

    The hover/torque roll was done at about half throttle and pretty easy to maintain. I noticed during the torque roll, when you hit that sweet spot, the plane had a slight tendency to want to lean towards the canopy as it rotated. Adding 1 degree of down thrust to the engine during installation would most likely eliminate that tendency. For me to add I degree of down thrust now, would throw the output shaft off center in the canopy. The torque rolls were easy enough to hold that it isn?t worth it to me at this point.

    Watch the Wild Hare Edge 540T 25% in Action


    The WildHare is a very capable 3D performer at a good size and great looks, yet not large enough to create transportation problems in most vehicles. The looks of an Edge are hard to beat, and the quality of the plane speaks for itself. This plane is also IMAC capable for those of you who want to hone in your IMAC skills. One of the nice things about the plane is the overall cost compared to the cost of the larger scale planes. The plane is a quick setup at the field, easy to transport, and is capable of doing all the maneuvers that you may like to try or practice. You won?t be disappointed.

    Manufacturer Information

    Wild Hare RC
    8608 Doral Ct.
    Flower Mound, TX 75022

    Comments on RCU Review: Wild Hare R/C Edge 540T ARF - 40cc

    Posted by: computermonkey on 03/02/2014
    Are you still flying this plane
    Page: 1
    The comments, observations and conclusions made in this review are solely with respect to the particular item the editor reviewed and may not apply generally to similar products by the manufacturer. We cannot be responsible for any manufacturer defects in workmanship or other deficiencies in products like the one featured in the review.

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