Eflite Clipped Wing Cub 250

Eflite Clipped Wing Cub 250

Current Power Setup

  • Motor: Eflite Park 300 1380Kv, 7A/9A max, 85W, 24g
  • ESC: Eflite 10A Pro, 10g
  • Prop: APC 7×6 on Eflite prop adapter
  • Batteries: ElectriFly 3S 600mAh 20C, 55g
  • Batteries to try: Kinexsis 3S 450mAh 50C, 48g

Current Radio Gear and Setup

  • Transmitter: Spektrum DX18 G1
  • Receiver: Spektrum AR6335 with AS3X, 2g
  • Servos (4): Turnigy TGY-D1290P digital, 2.9g
  • AS3X Rates: 50% Roll, 40% Pitch and 30% Yaw
  • Aileron Differential: 6mm or 57%

Previous Radio Gear

  • Receiver: Spektrum AR6310 (non-AS3X)

Current Specs

  • Wingspan: 30.7″ or 780mm
  • AUW: 10.5oz or 298g with 600mAh battery
  • CG: 1.75″ or 45mm aft of wing leading edge
  • Flight Time: 6.5-7 minutes with 600mAh battery

Manuals, Specs and Instructions

Original Receiver Swap (to AS3X)
I had a Spektrum AR6310 receiver before ordering my Eflite Clipped Wing Cub 250 ARF but when selecting servos I made sure to get digital just in case I wanted to go with AS3X later on. And sure enough, after flying the CWC 250 with a non-gyro receiver–even with my heavier than normal build, I opted to swap out to the AR6335 with AS3X. The difference is considerable. The gyro makes the CWC 250 feel like a much larger airplane and is considerably less affected by wind gusts. AS3X makes the landings smoother as well.

Eflite Clipped Wing Cub 250 Prebuild
I ordered my Eflite Clipped Wing Cub 250 ARF direct from Horizon Hobby and received it June 06, 2015. Man, was the build quality ever horrible! Most of the laser cut edges under the covering were burnt and show through the covering. Most of the control surfaces were very poorly glued (over-glued). Most the entire elevator control surface was glued solid to the horizontal stab. The elevator didn’t even move! I used CA debonder on cotton swabs and rubbed along the hinge line until the glue balled up and then picked it out with tweezers. What a freakin’ job! In addition, the covering and graphics were very poorly cut along hinge lines. See photo below. I should have just sent it back to Horizon but I decided to try and correct the issues. In the past few years I have purchased 12 Eflite models and this one has the poorest quality build that I’ve ever seen on an Eflite model.

Over-glued hinges and poorly cut graphics
Over-glued hinges and poorly cut graphics

Eflite Park 300 Motor & Mount
To fit the Eflite Park 300 motor to the Clipped Wing Cub 250, I epoxied 3/8″ basswood extensions on top and bottom of the motor box and shaved them down for cowl clearance.

Basswood extensions epoxied on top and bottom of motor box
Basswood extensions epoxied on top and bottom of motor box
Fitting the Eflite Park 300 motor X-mount on the CWC 250
Fitting the Eflite Park 300 motor X-mount on the CWC 250
Eflite Park 300 motor mounted to the CWC 250
Eflite Park 300 motor mounted to the CWC 250

Eflite Park 300 Prop Shaft
The Eflite Park 300 motor has a built-in prop saver which worked out well to support the 1/8″ or 3.17mm prop shaft out forward while keeping the weight aft. The Park 300 motor comes with the shaft protruding from the mount side so I pressed the shaft so it protrudes from the prop saver end.

Mounted Eflite Park 300 motor with prop adapter and prop
Mounted Eflite Park 300 motor with prop adapter and prop

Fitting the Cowl
With the cowl pushed back slightly, a little clearance was needed for the battery hatch.

Cowl clearanced for battery hatch
Cowl clearanced for battery hatch

Cowl Alignment
I enlarged the prop shaft hole in the cowl slightly to allow more clearance for the prop adapter. I used smaller screws to attach the cowl to the fuselage than what came with it.

Prop shaft alignment and prop adapter clearance
Prop shaft alignment and prop adapter clearance

Alternative Servos
At the time I built my Eflite Clipped Wing Cub 250, the recommended Eflite DS35 3.5g digital servos had not-so-good reviews of less than 2 out of 5 stars and cost a whopping $15.99 each! So like many, I looked around for alternatives. I went with Turnigy TGY-D1290P 2.9g digital servos at $6.25 each from HobbyKing. The Turnigy 2.9g digital servos have JST-ZHR 1.5mm connectors which are compatible with the Spektrum AR6310 and AR6335 receivers. I glued the aileron servos to the hatches with my tried-and-true Goop Automotive Adhesive & Sealant. Goop Automotive holds tight, remains flexible, and can be removed when needed. Canopy glue would have worked too but Goop Automotive is more flexible and has a lot better adhesion.

Turnigy TGY-D1290P 2.9g digital servos glued to aileron hatches
Turnigy TGY-D1290P 2.9g digital servos glued to aileron hatches

Tail Servos
The Turnigy TGY-D1290P 2.9g digital servos fit the stock tail servo mounts with just very minor clearancing.

Turnigy TGY-D1290P 2.9g digital tail servos installed
Turnigy TGY-D1290P 2.9g digital tail servos installed

Poor Build Quality Still Haunts Me
I found a broken spare in the nose of the fuselage on the left side below the window stanchion. The black graphics over one of the servo hatches was not completely cut out and I inadvertently pulled up part of it. Thankfully both were fairly easy fixes. After trial-fitting the wings to the fuselage, I am again reminded of the horrible build quality. Nothing straight and true about them. After thinking about this model for a while, I think it would have been better to be produced in foam.

Pilot Figure
I had a couple AirBorne Models Ultralite foam pilot figures, which are 39mm tall by 45mm wide and weighs less than a gram. I changed the ethnicity of the figure slightly from Chinese to American by repainted the eyes to make them slightly larger! 😆 The pilot figure is lightly glued to the top of the control rod sheaths.

AirBorne Models Ultralite foam pilot figure installed
AirBorne Models Ultralite foam pilot figure installed

Receiver Accessibility
When I first built my Eflite Clipped Wing Cub 250, I used Pacer 560 Canopy glue on the windshield and tape on the top deck skylight window. After switching out the receiver to AS3X, I learned that it’s a lot easier to have the windshield removable as well. Luckily it came off without damage so I was able to tape it back on with thin crystal clear tape.

Hangar 9 UltraStripe used to attach top deck skylight window
Hangar 9 UltraStripe used to attach top deck skylight window

Top Deck Skylight Window
On the top deck skylight window I used Hanger 9 Cub Yellow 1/4″ UltraStripe after cutting it the same size as the opening so it sits flush.

Top deck skylight installed with Hangar 9 UltraStripe
Top deck skylight installed with Hangar 9 UltraStripe

Wheels and Suspension Boots
Because I fly from a park with tough Bermuda grass and uneven ground, I nixed the stock wheels and wheel pants and went with 1/2″ larger wheels. I painted the hubs black. The wheels are ParkZone T28, Stinson, etc. The suspension boots are just two pieces of 5mm Depron foam glued together, rounded out, and painted black.

ParkZone wheels with blacked-out hubs and suspension boots
ParkZone wheels with blacked-out hubs and suspension boots

Battery Fitment
The larger of my two batteries, 3S 600mAh, fits nicely and stays put with just Velcro on the battery and battery tray. No battery strap needed. I shaved down the hairy side of the Velcro slightly to make it easier to remove the battery. I use Velcro brand hook-and-loop fastener because it’s stronger and lasts longer than most other brands, and available at my local hardware and craft stores. With the 3S 600mAh battery, there’s roughly a 1/2″ space to adjust for CG and about 3/4″ with the 3S 450mAh.

3S 600mAh battery in compartment, no hatch or cowl
3S 600mAh battery in compartment, no hatch or cowl

Prop Ground Clearance
With a 7″ prop and 1/2″ larger wheels, prop clearance is 1-3/8″ with the fuselage level and 2-1/8″ with the tailwheel on the ground.

Prop clearance with fuse level and tailwheel on ground
Prop clearance with fuse level and tailwheel on ground

Close-ups, Feedback and Reviews
To be more mobile friendly, photos on TazRC are limited in size. I would be happy to post any close-up photos on request. Just leave a comment below. Also, feel free to leave your feedback or personal review on the Eflite Clipped Wing Cub 250. Registration not required.

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