Dynam RC Messerschmitt BF-109

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Bf beauty1.JPG
Bf-109 in flight.jpg

The Dynam RC Messerschmitt BF-109 is an all-EPO R/C scale electric warbird manufactured by Shenzhen Dynam Industry & Trade Co., Ltd. of Shenzhen, China. It is distributed in North America by online discount hobby retailer Nitroplanes of City of Industry, California USA and is available as a near-RTF version with a Dynam five-channel sport radio system and a Dynam 2200mAh 4S lithium polymer battery or as an ARF less radio and battery.

Both versions come with full hardware, a small phillips screwdriver, a 1.5mm allen wrench, a spare three-blade propeller, two tubes of contact cement, diecut pressure-sensitive decals and a predecorated pilot figure with its own foam-safe CA for mounting it. Servos are 9g analog versions from Dynam's Detrum brand.

Supplied as well is a small amplifier which plugs in between the ESC and receiver. This is intended to eliminate a stutter at the motor under low throttle applications and does in fact aid with smooth throttle control.

A notable feature of the model is a pair of preinstalled Dia brand self-contained retractable landing gear, which look and operate like those on the full-scale version.

Prototype

The model represents Rote Sieben or Red Seven, a restored Hispano HA-1112 M-1L Buchón. This is a BF-109 built under license in Spain in 1950 and currently registered under the German civilian ID sign D-FWME. It is owned by Messerschmitt Stiftung, a German charitable organization which strives to preserve German heritage and which has restored D-FWME to full WWII-era BF-109 specifications.

Flight characteristics

The overall flight characteristics of the BF-109 are excellent. The scale three-blade propeller and 4S lithium polymer battery make for dramatic vertical takeoffs in moderate wind, but takeoffs during calmer conditions are more scalelike. Speed is scalelike as well despite the four-cell battery.

The radio provided with the RTF version has no provision for end point adjustments or exponential, resulting in somewhat limited aileron and elevator throw and quite a bit more rudder throw than recommended in the manual. A computerized radio system will allow for both more throw as well as exponential as shown in Nitroplanes' YouTube video linked below. That model is shown doing loops, rolls and inverted flight which are difficult to achieve with the stock radio.

Landings performed under gradually reduced power result in smooth touchdowns on the mains. As speed is reduced, slight application of up elevator will bring down the tail.

Ground handling is good, but the narrow track of the mains make the BF-109 prone to plowing into a turn if too much power and rudder are applied.

Specifications

  • Wingspan: 50" (1270mm)
  • Length: 45.8" (980mm)
  • Wing loading: .19 oz/sq. ft. (50g/sq dm)
  • Flying weight: 49.5 oz (1250g)
  • Servos: Four Detrum 9g analog with two Dia 3.6 75 self-contained retract systems
  • Battery (RTF): Dynam 2200mAh 25C 3S 14.4V lithium polymer with proprietary connector and JST-XH balancing plug
  • ESC: Detrum 40A brushless with proprietary connector
  • Motor: Dynam BM3720-A-KV500 brushless outrunner
  • Propeller: Dynam 13x7 three-blade electric
  • Transmitter (RTF): Dynam 2.4GHz five-channel sport radio with servo reversing, analog trims, aileron sub trim, non-proportional fifth channel for retracts and a throttle hold switch
  • Receiver (RTF): Dynam seven-channel with gear control channel and two auxillary channels
  • Operator skill level/Age: Intermediate/14+
  • Catalog number (both versions): DY8951
  • PNP/RTF prices through Nitroplanes: US$129.00/$219.00

External links and references