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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_cub.jpg) |
And why did we call them ROADKILL???? They are just plain flat! ;-)
First built in 1938, the Piper J-3 earned its fame as a trainer. So successful was it that
the name "Cub" soon came to be a generic term for all light airplanes, and Piper Aircraft became the best known general
aviation manufacturer. By 1947, when production ended, 14,125 Piper Cubs had been built. The J-3 is now finding an ever-increasing
popularity among antique airplane buffs, and brand new Cubs are being constructed by homebuilders. Both an excellent trainer and
a delightful sport plane, which lends itself to lazy summer afternoons, the Cub might best be summed up by the words "simple,"
"economical." and above all "fun to fly."
The Cub is designed with both beginners and sport flyers in mind. It's big enough to carry a little more weight, such as a
third servo for independent rudder and aileron. The wing skins and tail surfaces are from slightly thicker balsa to make them
easier to work with for inexperienced fingers, and more durable for the inevitable bumps of training operations, but without
much increase in weight. The model can be built either with scale dihedral for "full house" controls, or with extra dihedral
for no ailerons (just rudder & elevator). We include laser-cut gauges to easily and precisely set the dihedral at either value
during construction.
With the extra dihedral, the plane will indeed return to level flight by itself when the controls are centered. With the
control throws limited it's very stable and easy to fly, but can be very aerobatic with larger control throws. It's also
very efficient, even with the optional scale wing struts installed - we've clocked it at about 18 minutes of economy cruise
flying indoors, using a 7-cell 120 mah NiMH battery. It also thermals well.
The motor+gearbox+prop is included, as with the other RK series models, but the Cub comes with our new improved MPS-1A
system. This uses a different frame design that holds the front end of the motor more securely and precisely for better
gear mesh and reliability, a propshaft gear that's bored on new improved tooling for better concentricity and mesh
(resulting in improved noise, life and efficiency), and uses a modified GWS 5-4.3 prop instead of the Gunther props we
used on the old MPS-1. This new design also allows us to offer other prop options, such as a modified GWS 6-5 for higher
altitude operations. The MPS-1A is standard on our new RK series models, and the older RK series models are available with
it as well. We also offer the MPS-1A as a stand-alone system, at the same prices as the old MPS-1.
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| Cub Specifications |
| Wingpan |
Length |
Weight |
Wingloading |
# Servos |
Battery |
Price |
| 29" |
17.8" |
3.5oz (RTF) |
4.2oz/sq.ft |
2 or 3 * |
250mah Li-Poly / 120mah NiMH |
$51.95 |
* The J3 Cub 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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