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  1. R

    UMS engines

    http://umstech.in/radial-engine/ums-5-125cc-radial-petrol-engine.html
  2. R

    Robart Onboard air pump?

    This is brand new so I doubt there is much feedback yet. I have this same style Robart pump for ground support and it works great. My only concern about this on board pump is its weight.... adds a POUND to your aircraft. No big deal for a really large plane.
  3. R

    Scale RCM 1/3 Scale Champ Build

    LOVE your Champ build. GREAT engine choice!
  4. R

    5 Cylinder radial glow driver

    Yes. Sullivan Products sells a 5 cylinder glow driver which works with LiPos. http://sullivanproducts.com/product/onboard-glow-plug-drive-five-c/
  5. R

    5 Cylinder radial glow driver

    Indeed! Spendy! So, to adequately regulate the current demanded by (in my case) 9 glow plugs, the regulator must handle minimum 20 amps. In the case of a 5 cyl., minimum 12 amps. Because of the way the McD works - it pulses the plugs at the input voltage, but for a limited duty cycle - it...
  6. R

    5 Cylinder radial glow driver

    I tried running a LiPo with a McDaniels (Sonic Tronics) 9 cylinder glow driver and burned up all 9 O.S. 'F' plugs! An EXPENSIVE lesson! The McD chops / pulses the output. No regulator can stay ahead of this pulsed output and when it cannot, you hit the plugs with far too high a voltage. Better...
  7. R

    Scale RCM 1/3 Scale Champ Build

    Beautiful build! Great info. The Roto 85 opposed twin will be more than enough power for this plane and the sound will be ideal. Have you already checked the fit of the engine in the cowl?
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