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| DJ Aerotech
Makers of the Finest, High Performance Electrics & Sailplanes! |
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![[ROADKILL CLASSIC CIVILIAN SERIES PIPER J3 CUB]](roadkill_civ_img/rk_junior.jpg) |
And why did we call them ROADKILL???? They are just plain flat! ;-)
The original "Junior" was a classic 1930's tandem two-seat parasol monoplane, with the engine mounted above the
wing and driving a pusher prop just behind the trailing edge. It was Curtiss-Wright's attempt at a general aviation
sport and training airplane, and by all accounts flew very well. In addition to the obvious traditional uses, it
also excelled at some unconventional ones. The magnificent view from the front cockpit, no propeller in the way,
and the ability to easily mount a shotgun on a swivel mount on the nose, and short-field landing abilities made it one
of the best coyote-hunting airplanes ever built. Today there are a number of them still flying, as well as some
homebuilt designs inspired by it, such as the Woody's Pusher.
Our model began when Joe pointed out that we really needed some good training models in the RK Series.
Our Piper J-3 Cub is an excellent trainer, especially when built with the extra dihedral and no ailerons option,
but we wanted something with similar stability, handling and efficiency but that would protect the prop in a bad
landing. The Junior's pusher arrangement was ideal for this, one of the few cases where I'm in favor of pushers.
In addition, the profile fuselage arrangement minimizes the amount of disturbed airflow the prop has to deal with,
unlike some of the other parasol-pushers out there. Our Junior has similar efficiency to our J-3 Cub, typically
getting around 15-20 minutes of indoor economy cruise from a 120 mah 7-cell NiMH battery. Outdoors it also does
well, including its thermalling abilities. Turning radius is very tight, ans sink rate is quite respectable even
with a windmilling propeller. Penetration isn't quite in the same league as a good open-class sailplane, but then
there's always the throttle if you need a little more.
Like the Cub, it can be built with or without ailerons, for either training or sport flying. Roll response in both
versions is very good, and the no-ailerons version will level out by itself if the controls are released (i.e.: the
extra dihedral gives it positive spiral stability). We've tested it outdoors in measured winds up to 7 knots with
gusts to 11, including fairly strong turbulence from nearby large buildings. Both versions also do nice positive-G
aerobatics. Loops, rolls, hammerheads are all possible. It doesn't particularly like spins, it quickly tries to
recover and the maneuver turns into a simple spiral.
Power is from our new improved MPS-1A motor/prop/gearbox combo, and this is included in the kit. It uses a new frame
design for more secure holding of the motor and better control of the gear mesh, new tooling for manufacturing the
main drive gear for better concentricity, and a GWS 5-4.3 prop instead of the Gunther prop we used to use. We're
using this system now on all of the Roadkill Series models.
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| Junior Specifications |
| Wingpan |
Length |
Weight |
Wingloading |
# Servos |
Battery |
Price |
| 30.6" |
16.8" |
3.6oz (RTF) |
3.6oz/sq.ft |
2 or 3 * |
250mah Li-Poly / 120mah NiMH |
$51.95 |
* The Junior can be built with either a independent rudder servo or coupled to the aileron servo.
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| Kit Highlights! |
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Electric (MPS-1A) motor with gear reduction included! |
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Propeller and spinner are included! |
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Highly prefabricated for very short building times! |
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Laser cut wood parts for an accurate fit! |
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3 - Functions; Rudder, Aileron and Elevator.
(Rudder is/can coupled to Aileron servo) |
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Complete and accurate plans and building instructions! |
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Click HERE
to see a sample kit!!!
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What is needed to complete the kit!
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Two or Three servos. Such as the Pico, MX-30 or HS-50 |
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A lightweight receiver. Such as GWS-R4P |
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Electronic speed controller & Battery Eliminator Circuit.
Such as Castle Creations "Pixie 7P" |
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7 cell NIMH or 2 cell Li-Poly Battery pack. |
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Medium & Thin CA Glue |
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Building Tools, for example: (Knife, wire snips, needle nose, waxed paper,
soldering iron, X-acto knife, sanpaper, screwdrivers & tape for hinges) |
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DJ Aerotech carries the necessary items to complete your Roadkill kit. Please check
out the Accessories page. We offer a suitable Receiver, Electronic Speed Control
/ Battery Eliminator Circuit (ESC / BEC), Battery Packs, Charger and several Servos for the DJ Aerotech Roadkill models. |
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Photos
Click on thumbnail to enlarge image.
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| IMPORTANT BATTERY INFORMATION |
We are receiving numerous E-mails related to problems flying our Roadkill kits. In every case it is an weight issue
related to using a battery pack too large for the kit. We can't STRESS enough the proper sized battery pack should be used in all
the Roadkill kits. Larger packs WILL yield undesirable flight characteristics. For each of our Roadkill models we post a recommended
NiMH or LI-Poly battery size. These batteries packs have been extensively tested and proven to provide a flyable model based on the
stock motor configuration.
The Li-Poly battery packs MUST be charged with a charger designed to charge Li-Poly battery packs.
(For example: The Apache LiPoly Charger) Failure to do so could result with the battery pack (basement / garage etc...)
catching fire. Also make sure your ESC is compatible with a Li-poly pack, in particular that the cutoff voltage is correct.
The Castle Creations Pixie 7-P is our preferred choice for this.
PLEASE, PLEASE, PLEASE... If you have any questions at all about what is the best battery for your model, don't hesitate to send an
e-mail to Joe or Don.
| Do you have more questions?
Check out the ASK J & D section on Roadkill models. |
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