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  1. #1

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    Tach. readings OS 120 III Surpass w/pump

    Does anyone have tach. readings for OS 120 III Surpass with pump and 15% nitro fuel. I'm testing with ACP prop.size: 16x6 , 15x8 and 15x6. I have troble getting high rpm's, but I'm not sure what to expect...

  2. #2

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    RE: Tach. readings OS 120 III Surpass w/pump

    I have this engine and it will turn a APC 16x6 @ 8500rpm, 15x6@9800rpm on 10% nitro and 20% oil castor/syntetic blend.

    I liked the 15x6 better than the 16x6 for funfly aerobatics and hovering but a 16x6 can be used on a scale project.

  3. #3
    Super08's Avatar
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    RE: Tach. readings OS 120 III Surpass w/pump

    Just ran my fisrt tank though and I am showing 8500 on a Zinger 15 x 6-10 with the idle at 1950. I will post more results after I get it broke in. Plan on using Xoar 16 x 6 with it on a GP PT-17.
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  4. #4
    Super08's Avatar
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    RE: Tach. readings OS 120 III Surpass w/pump

    Update to my above post. Changed to a Xoar PJA 16x6. RPM is hitting 9,000 (peak) but will fly at 8800. Tthe idle is around 1800. I will have to pull the engine though as it has a leak around the pump. I think it is just the fuel line so I will put some keepers on them. Engine has 5 tanks of fuel run through it. The muffler vibrated loose and came off the end of the flex pipe when I was on the third tank. It gained over 200 rpms and wasn't much louder. I put it back on for now, but it got me thinking....
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  5. #5

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    RE: Tach. readings OS 120 III Surpass w/pump

    Mine is inverted in a Diabolic 3D and I had some time flying it today with APC 16x6 and it ran just fine and is very quiet with the 45-degree DuBro exhaust extension on the end of the muffler and it also helps keeping the airplane even cleaner.

  6. #6
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    RE: Tach. readings OS 120 III Surpass w/pump

    I've finally got my 1.20-E surpass (non-pumped) on the test stand. I purchased used from Motorman57, but I believe it was just broke in. Anyway, I put a MA K series 16x6 and got 9100rpm richened up a click or two for flying. Idled at 1800rpm. My numbers were better than I expected. I was hoping for upper 8000's. It was run with Omega 15% at about 150ft, 63 degrees outside.

    Regards,

    Dave


  7. #7

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    RE: Tach. readings OS 120 III Surpass w/pump

    There must be something seriously wrong with my motor. My tachometer-readings shows only 6300 rpm with 15x8, and 6100 rpm with 16x6, using fuel with 15 % nitro and 18 % oil............... I have ordered new ball-bearings, and that will hopefully solve the problem [&o]

  8. #8
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    RE: Tach. readings OS 120 III Surpass w/pump

    Yes it should be higher than that. I switched down to 10% and I am still getting about 8600 with an Xoar 16x6. Enige has less than a gallon of fuel through it.....
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