vtach688's blog View Details
Archive for April, 2019
Posted by vtach688 | Apr 05, 2019 @ 08:51 AM | 1,187 Views
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)