RCU Review: COX Extra 300 RTF electric R/C Aerobat

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    Contributed by: Burc Simsek | Published: February 2011 | Views: 36697 | email icon Email this Article | PDFpdf icon
    RCUniverse.com Review of the COX Extra 300

    Burc Simsek

    Distributed by
    Great Planes Model Distributors
    P.O. Box 9021
    Champaign, IL 61826-9021

    It seems lately that the micro sized airframes are taking over. There is definitely no lack of supply when it comes to airframes in this size. If you walk into almost any hobby shop today, you will no doubt see the new COX Extra 300 being displayed front and center.

    So what makes the COX Extra 300 deserving of your hard earned cash? Well the COX Extra 300 is marketed as an entry level 4-channel RTF sport aerobat that promises to provide the next step up from their Sky Ranger trainer which is only a 3 Channel. It promises to deliver fast and easy fun to allow you to perform rolls and loops right out of the box.

    The fact that it comes RTF with everything included out of the box and with a 2.4GHz transmitter no less will definitely make this quite appealing to anyone that is looking for an out of the box experience. So lets take a quick look at what is provided with the COX Extra 300 and see what she is capable of.

    • SafePropTM design
    • Adjustable Mode I/II radio 2.4 GHz Radio
    • FlightFlexTM foam design
    • Great looks

    • No LVC in ESC

    Skill Level:

    Time Required to Build:

    Frustration Level:

    What do these ratings mean?

    Name:COX Extra 300 RTF electric R/C Aerobat

    • Price: $99.99 (Accurate as of review date)
    • Stock Number: COXA6502
    • Wingspan: 20" (508 mm)
    • Wing Area: 62.4 sq in (4.02 sq dm)
    • Weight: 3.35 oz (94 g)
    • Wing Loading: 7.7 oz/sq ft (23.5 g/sq dm)
    • Length: 18" (457 mm)
    • SafePropTM 
    • 2.4GHz Radio
    • FlightFlexTM Foam
    • RTF
    • Mode 1 & 2 Adjustable Transmitter

    The COX Extra 300 arrives ins a colorful box that contains the pre-assembled airframe, transmitter, charger, battery and small accessories pack. Everything is packaged quite well within formed foam compartments. 4xAA batteries are also included to power the transmitter. 

    Taking everything out of the box, the RTF nature of the Extra 300 becomes evident. The blue on white foam decorated with silver/gray and black graphics is truly beautiful. This is one of the best looking micro airframes that I have to date laid eyes on. One of the unique features that catches your eye as you start looking over the components is the SafePropTM design. The prop and spinner simply clicks onto the motor shaft and promises to snap off in the event of a mishap saving you from replacing a shaft or a prop.

    The provided transmitter is 2.4GHz and has a very unique feature. When two screws are removed from the back, the antenna can be flipped over making it a mode 1 transmitter. Note that it has trim switches on both the bottom and top of the gimbles to allow you to trim the model when in Mode1. The transmitter also features an LCD display that shows the amount of battery remaining and the flight mode (i.e. low or high rates). The low or high rates are selected by pressing down on the right transmitter stick. A small bag contains the battery, the main landing gear and a small screwdriver. Power is supplied by a 2S250mAh battery which can be charged using the provided charger (at 400mAh) and the AC adapter. 


    The Extra 300 manual provides a good amount of detail that aims to help a beginner achieve success on their first flight. 

    Download the manual

    The assembly process of the Extra 300 takes only a few short minutes. The wing aileron worm geared servo lead is connected to the extension coming from the fuselage before the wing is inserted and screwed in place with a single screw. One additional precaution I took was to use a couple of small piece of tape to strap down any wire securely to the foam to make sure that they would not interfere with the servo mechanisms.

    Once that is done, the landing gear simply inserts in the slot of the bottom of the fuselage and the propeller can be snapped in place making the Extra 300 ready for flight. All that needs to be done is to wait for the battery to charge. The battery inserts into the fuselage via the small hatch on the bottom of the airframe. The hatch is held shut by a little rotating locking mechanism which works out quite well.

    The winter months in Houston are relatively mild in terms of temperature however with hotter weather comes the wind. The Extra 300 manual recommends that the airframe be flown outdoors in conditions with less than 5mph wind which is usually a rare event during these months here so it was a waiting game to find the right opportunity to fly the Extra 300. Luckily the weather cooperated and on a sunny and calm day I had the chance to fly the Extra and take some pictures against a perfectly blue sky.

    One of the first things that you will notice as you power on the Extra and check for the surface movements is that they move only a relatively small amount, even on high rates. This causes the Extra to have a little less than desirable ground handling characteristics. But that is not a problem as the Extra 300 can easily be hand launched and can take to air in only a couple of feet when rolling off the ground.

    Once in the air I had to apply a good amount of down trim to get the little Extra 300 to fly straight and also noticed that the Extra likes to be flow with a good amount of throttle. The Extra does not have a very long glide curve and when you back off the throttle, you have to be careful to watch for a potential tip or wing stall. However flying at mid throttle settings, the Extra is a pleasure to fly around and it does zip around quite well.

    The limited throw on the rudder and the power available from the motor does limit its flight envelope a little as I found I could not do any knife edge or snaps. However, I was surprised to see how agile the Extra 300 is when flown aggressively. It can do nice loops and rolls and looks beautiful as it performs them. Inverted flight requires a good amount of down elevator to be applied but the Extra can do outside loops just as well as inside loops.

    The provided battery allows you to fly the Extra 300 for about 8-10 minutes but you have to pay attention to your time and land before the battery gives out as when it does, it does so completely causing the Extra to drop out of the air.

    One of the biggest things that surprised me about the Extra 300 was its durability. During a break from the rain when the weather was perfectly calm, I took the Extra out to the small clearing in front of my house. This area is a small opening and is surrounded by trees and while filming its flight, I ended up crashing in the trees (and ground)  a little bit more than usual. However every time I struck something, the Extra seemed to bounce back and begged for more. The SafeProp design allows the prop to simply fly off the airframe saving it from damage and the FlexFoamTM that the Extra is made of was very durable and did not suffer any damage from the numerous times I crashed in the ground or got it caught in the trees. Just check out the video where I left in some of the less than memorable times to give an idea of what you might expect when you inevitably dumb thumb the Extra into the ground. In every event, I was able to simply snap the prop back and and toss the Extra back in the air with no damage.

    Check out the video to see her in action!

    COX Extra 300 (Pilot: Burc Simsek, Photos: David Smith, Video: Mugé Simsek)
    Or, Download the Video (24meg)

    I think that its great looks, durability and performance coupled with fact that it arrives completely ready to fly with a 2.4GHz transmitter, LiPo and charger makes it a very appealing product. I think COX is on the right track with the FlexFoamTM and SafePropTM technology. For someone that is stepping up from the COX 3-channel Sky Ranger, the Extra 300 should provide for a good challenge in terms of learning aileron control, coordinated turns, rools, loops, immelmans and such. Experienced flyers will definitely enjoy taking the Extra 300 to the limits of its flight envelope. 

    Overall, I can say that I was pleased with the time that I had behind the sticks of the Extra 300. I look forward to their next release which I can only hope will be even more powerful and maybe even 3D capable. All-in-all, it's a winner!

    Distributed by
    Great Planes Model Distributors
    P.O. Box 9021
    Champaign, IL 61826-9021

    Comments on RCU Review: COX Extra 300 RTF electric R/C Aerobat

    Posted by: djnsayne on 03/03/2011
    watch out for that tree!!!!!!
    Posted by: Branko Ljubetic on 05/09/2012
    I disagree about the throttle. Actually, i like to make low level fly-by`s with 1/3 throttle. About the throw on the rudder, i disagree about handling, i make staright run on the take off. Another tip is about rudder horn has 4 holes, and the plane comes factory settled in the second most-outside hole, so you can change the clevis to a inner one, but i love the fly of this little bird, so i use as factory setting.
    Posted by: Branko Ljubetic on 05/09/2012

    Posted by: radcon56 on 12/06/2012
    Hi Everyone! Have you seen anyone change the wheels to something a little larger while still keeping the weight down? Also, excellent work with the Camera!
    Posted by: radcon56 on 12/06/2012

    Posted by: dirk.matherne@att.net on 12/23/2012

    Posted by: dirk.matherne@att.net on 12/23/2012
    take landing gears off throw away now HAVE FUN! belly lands easy
    Posted by: f16man on 05/03/2013

    Posted by: f16man on 05/03/2013
    servos can hardly move control surfaces making airplane close to unflyable cox never sold junk like this back in the day!!!!!
    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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