INTRO
As their all-time best customer, I usually get the inside scoop from my LHS. Apparently, the new E-Flight UMX Carbon Cub is a retailer’s nightmare, attempted returns are rampant. The problem seems to be caused by low quality linear servos in the Carbon Cub’s application. 
SPECS
- Wingspan: 24.0 in (610mm)
- Overall Length: 15.7 in (398mm)
- Wing Area: 83.5 sq. in. (540 sq. cm.)
- Flying Weight: 3.17 oz (90 g)
FEATURES
- Motor: 180-size, 2500Kv brushless outrunner
- Flaps
REQUIRES
- DSM Radio
PRICE
- $220 MSRP, $170 Street
UPGRADES
- Floats Available: $30
While all Horizon micros use delicate, exposed gear linear servos with a few month half-life, it seems the Carbon Cubs problem is a lack of control surface throw requiring hyper extension of the servo. When users set 100+% travel, the worm gear drives the servo’s wiper past the intended endpoints of the contact strip.
This has been breaking elevator servos within a few flights, often catastrophically damaging/destroying the plane. The alternative: not enough elevator throw, seems equally defective.
Given a rash of quality problems with Horizon UMs and their known bad linear servos in particular, I am putting out an immediate AVOID recommendation on the UMX (what is the X for, again?)Carbon Cub.
The dysfunctional UM Carbon Cub continues a long line of UMs with unacceptable component quality, coupled with unacceptable over-pricing. Full sized PNP or RTF Cubs generally sell around $100.
This 55” EPO Super Cub sells for $149 including a 2.4Ghz radio
1.5 to 2 meter balsa and ply ARF Super Cubs also run for less than the Carbon Cub. Z8RC’s recommended competitive target street price for the UMX Carbon Cub is $79 MSRP, $69 Street price. I placed it on the high end of the current micro market price range, based on the inclusion of flaps and a decent motor.
GRADES
Appearance: B-
Funky windscreen. Lines slightly off. Ok, but not quite right.
Aerodynamics: Untested
Power System: C-
E-Flight 180 2500 kV = good, expensive motor. Predicted reliability of integral ESC and E-Flight batteries: Very poor.
Build Quality/Durability: F
Cheap Styrofoam micro at a giant scale scale balsa and ply ARF price. Cheap linear servo failures are rampant. Weak tail.
Value: F
Low end micro components at a giant scale price. Poor, non digital servos with exposed gears. Low amp, integral ESC. DSM Rx.
Overall Grade: F
Rip off pricing. Non-competitive component quality.
