Topic: Emcotec MPS RV

Blue Laser ready

The second Laser is ready to fly. I’m not sure about the weight but it should be lighter than it’s red sibling.
Here’s the list of goodies:
– OS 2.0 FS w/ Perry pump
– Hatori header and pipe
– Emcotec DPSI-mini RV dual magnetic switch w/regulator
– 2x Kokam 800Mah LiPo
– Graupner SMC-16 Scan SPCM receiver
– Hitec Servos
– Tettra 560ml Crank tank

It balanced perfecly without any adjustments. The spinner from Dave Brown will be substituted for a light backplate tru-turn after the next Central Hobbies order. And on tuesday this week, it flies. Wish me luck.
Pictures are here

Laser (blue) specifications

The list of items to go into the Laser is getting pretty complete:

  • Servos
    • Hitec HS-6635HB x2 (Wings)
    • Hitec HS-5985MG x2 (Elevator, Rudder)
    • Hitec HS-475HB (Throttle)
  • Battery
    • Emcotec DPSI mini dual power with magnetic switch
    • Graupner (Kokam) 2S 800mAh LiPo x2
  • Receiver
    • Graupner SMC-16 Scan 7 channel SPCM synth
  • Radio
    • Graupner MC-22

I’m missing tailgear, wheels, tank and spinner. The Elevator will be actuated by an MK dual BB coupler and a carbon pushrod. The rudder will use control-line wire as a pull-pull system. Other bits and pieces like rudder horns and aileron pushrods will be homemade.

Post will be updated with pix and more info.

Weight saving Laser RX Battery

Something had to be done about the overweight Laser so I’ve invested a bit in replacing the heavy GP 2000 mAh NiMH battery. The weight saved was 84 grams, not bad for more than 130 euros worth of kit… That’s F3A nuts for you. I didn’t need the 5-cell 2000 mAh battery in the first place but my wallet hurts trying to follow that thought. Still, in the interest of safety the Emcotec MPS RV LiPo voltage regulator has a built in magnetic switch that is 100% shake, wear and tear proof unlike the old mechanical system. It keeps the servos happy pumping out a steady 5,9 volts and is very light and robust. Shown in the picture is the switch/regulator unit including magneto for switching on/off.

Here’s the original battery pack/switch unit which weighs in at 209 grams.

The DPS RV unit with all mounting hardware and a Graupner 2S 1500 mAh LiPo battery weighs 125 grams.

The DPS RV and battery mounted in the fuselage. Mounting is very easy due to the sticker which also acts as a drill guide and a soft sticky pad is included that will keep the unit safe from vibrations.

Outside view of the fuse. The LED is extremely bright and gives signals of LiPo or NiCD/NiMH modus, low voltage etc.