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Apr 05, 2019, 08:51 AM
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Build Log

Great Planes J3 Cub ARF

I was looking for a Cub as my next project and was looking for a kit, but I came across this ARF on Amazon. I've built and flown the Great Planes .40 kit back in the 90's and loved it. So here are some detail of the ARF. This is the fabric covered version and looks pretty scale.

Great Planes GPMA1310
Wingspan: 81 in (2055 mm)
Wing Area: 984 inē (63.5 dmē)
Weight: 8.5 lb (3.86 kg)
Wing Loading: 19.9 oz/ftē (61 g/dmē)
Fuselage Length: 49 in (1245 mm)
Requires: 2-stroke .40-.65 cu in (6.5-10.5 cc) or 4 stroke .52-.70 (8.0-11.5 cc)

I chose to go electric and used a Rimfire 55 motor and 60A esc with 6s 4000 mAh battery, with a 5A bec.

The assembly was straight forward and no issues where found. It has a one piece wing with two servos for the ailerons ( nice because you can mix in flap-arons ). I use standard Hitec HS 311 servos all around, a ZTW 60A esc, and hobby king flight batteries. I also put on the bigger Kavan 5in wheels, they where a lot lighter than the Dubro's and it makes it look way cool (IMO)

I fabricated a door to change out the flight batteries.

The plane flies great! Flies like a Cub, it will ground loop so you have to walk the rudder (like the real airplane), and rudder input is needed on turns ( to make it look scale). I first put on a 15x4 Xoar prop and she flew slow, and steady, doing nice lazy 8's and stall turns. The 13x6 APC flew it more sporty with loops, rolls, and simple maneuvers. It flies well at 30% power.

I put it on the watt meter and had 800-1000 watts @ 35 amps with the 13x6 APC, with a 70% charge on a 30c batt. I haven't checked the 15x4 prop. It also had 50% charge left after a 7 min flight. The 15x4 prop drained the battery quicker ( 15% left after a 6 min flight). Over all I'm very happy with the plane.

here's link to the short youtube video.

J3 Cub (1 min 21 sec)

Great Planes J3 Cub ARF (4 min 22 sec)
Last edited by vtach688; Jun 07, 2019 at 10:27 AM.
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Apr 05, 2019, 02:55 PM
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Flight update

I took the Cub out today and did some more flying.

Having the field to myself gave me time to really fly and focus on the new plane. I took my time to learn its habits, stall characteristics, and shot a ton of approaches. Once i started getting comfortable, i started to do touch and goes, which is fun with this airplane.

This plane is not a beginner plane and you have to fly it, from take off to landing, but it's not too difficult and I find it a pleasure to fly. Coordinating turns with rudder and ailerons is fun and side slips look super cool and are a blast.

Forgot to mention but mine came in at 8.3lb overall and the CG was dead on at 4 in back from the leading edge.
Apr 06, 2019, 07:01 AM
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Nice! Not a small plane.
Apr 06, 2019, 03:09 PM
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No its not, i believe it's close to 1/4 scale. Thanks
Apr 11, 2019, 08:04 PM
Stay out of my junk drawer
Razer8811's Avatar
Originally Posted by vtach688
No its not, i believe it's close to 1/4 scale. Thanks
This is still considered a .40 size or around 1/5th scale. My Sig Cub is 1/5th scale and 84" wingspan. My quarter scale Balsa USA Cub is 108" wing span. My 1/5th scale looks tiny compared to the 1/4 scale Cub.

Great info on the electric setup...
Apr 11, 2019, 08:44 PM
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Yes I believe your right.

And thanks

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