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  1. #1
    liquid_TR's Avatar
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    OS 56 Alpha FS - RPM readings

    I've just broken in my 56 alpha a week ago with 10% Nitro CoolPower fuel using 11x7 MA 3-blade prop.

    Initial rpm readings during 3rd tank just before first flight is 11500 RPM peak.
    I suspect its going to get a *little* higher after the first gallon as this engine really likes to rev. (lightning fast transitions from idle to max rpm).

    If the weather permits, tomorrow I will try it with APC 12x6 and APC 13x6 props and report back.

    So far I cannot believe how *smooth* and *CLEAN* this engine is running..

    If there are others who have some rpm readings for this baby please chime in.
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    LiQuid TR

  2. #2
    TimC's Avatar
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    RE: OS 56 Alpha FS - RPM readings

    I'm looking forward to the readings with the 12x6 APC. Your new O.S. sounds pretty strong on the top end.

  3. #3
    liquid_TR's Avatar
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    RE: OS 56 Alpha FS - RPM readings

    10% CP fuel
    APC 13x6 -> 10500+ peak , 10000 rpm flying. no lag in spool up.
    LiQuid TR

  4. #4
    liquid_TR's Avatar
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    RE: OS 56 Alpha FS - RPM readings

    just tried APC 11x9 prop on same fuel. --> 10000 RPM dead on.
    LiQuid TR

  5. #5

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    RE: OS 56 Alpha FS - RPM readings


    ORIGINAL: TimC

    I'm looking forward to the readings with the 12x6 APC. Your new O.S. sounds pretty strong on the top end.

    Did you ever try the 12x6 APC?

  6. #6
    CustomPC's Avatar
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    RE: OS 56 Alpha FS - RPM readings

    I jut got mine delivered today.

    I have props in 11x7-8, 12x6-8, 12.5x6 & 13x6-9, mostly APC's with a few bollys and MA's

    I'm planning on breaking the motor in this coming weekend and testing the 12" props. I'm hoping the 12x7 or 8 give me the performance i'm looking for on a little pattern plane.

  7. #7
    CustomPC's Avatar
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    RE: OS 56 Alpha FS - RPM readings

    I broke my motor in today and recorded the following figures.

    All are on 20/20 Fuel after about 10oz if the rich-lean-rich-lean break in cycle suggested in the manual.

    APC 12x6 10,900
    APC 12x7 10,300
    APC 12x8 9,600
    APC 13x6 10,000
    APC 14x5 narrow 10,000

    Out of the box i couldn't get a reliable idle below 3,000 but after about 30ozs of fuel i leaned the low need 1/8th of a turn and it idled around 2,100 with great transition.

  8. #8
    TimC's Avatar
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    RE: OS 56 Alpha FS - RPM readings

    That engine is a winner CustomPC.

  9. #9
    CustomPC's Avatar
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    RE: OS 56 Alpha FS - RPM readings

    We had a club fun fly this weekend just gone so i mounted my .56 onto a ModelTech Magic and put a 13x4 APC prop on it.
    I tached it a 11,200 peaked and and flew it at 10,900.

    There were 10 other Magics at the fun fly and the other 9 were all .46 2-strokes. The .56 had enough power to beat most of 46's on the vertical climb. It just went straight up and was almost a dot at the 10 second cut off.

    Such a sweet little motor.

  10. #10
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    RE: OS 56 Alpha FS - RPM readings

    The Magic is a funny bird some props the run up nice on the ground don't do so hot in the air
    I found the 13x4 works best with the magnun 52 4 stroke I have a os56 that I'm going to use was hoping the 13x6 would work for better vertical and hover power
    land of the FREE: you\'re free to get a JOB not a handout.
    home of the BRAVE: they paid for it and you\'re enjoying it

  11. #11
    Super Splatter's Avatar
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    RE: OS 56 Alpha FS - RPM readings

    60 some degrees, 900 ft eleavation, dry , 56a on a sportester with a APC 13-6

    10,000 r's on the nose, idles at 2800

  12. #12

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    RE: OS 56 Alpha FS - RPM readings

    Hi Super Splatter,

    What fuel are you using?

    Regards

  13. #13
    Super Splatter's Avatar
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    RE: OS 56 Alpha FS - RPM readings

    Omega 15% - half the lube is castor. I have run just a half a gallon and I can tell the idle is getting better. It does have a narrow range of needle adjustment. It needs to be needled fairly close to lean on the high speed to have a mid range that's workable without being rich. The low speed had to be leaned about a 1/3 turn. I do have the baffle in the muffler. Runs too nice to fuss with, very economical on fuel and leaves a small mess to deal with.

  14. #14
    liquid_TR's Avatar
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    RE: OS 56 Alpha FS - RPM readings

    Removing the baffle wont really increase performance much, wont affect the needle settings or the way it runs but the sound is much better IMO.
    LiQuid TR

  15. #15

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    RE: OS 56 Alpha FS - RPM readings

    I live in Vegas not sure of the alt and did test today at about 90 degrees

    15% Cool Power around 1/2 gallon through motor in the last two weekends. 1.5-2 hrs total time on engine. Just started timing this weekend. 50 mins today.
    13x6 apc sport
    10,100 RPM operating RPM

    Idle is about 2800 right now had to tweek the low end needle.
    Steven AMA# 737516
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  16. #16

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    RE: OS 56 Alpha FS - RPM readings



    Hello:



    Is anyone running a 3 bladed prop on this engine, if so the RPM's,



    Thanks,



    Mark.


  17. #17

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    RE: OS 56 Alpha FS - RPM readings



    Does anyone have tested this engine with a Graupner 12,5x6? I'm curious to compare it to my TT F-75s...because it looks that this engine gives more power than mine, I'm getting about 9600 RPM....but the Graupner according to Pe's spreadsheet, has a greater prop constant...





    Saludos,





    Jorge

    Jorge Andres Estrada

  18. #18

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    RE: OS 56 Alpha FS - RPM readings



  19. #19

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    RE: OS 56 Alpha FS - RPM readings

    Yes, runs the 12.5-6 very well, can't give RPM's , but runs very good with nice verticals and that is not on a 3D airplane.

    L.
    Cherokee Flyer
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  20. #20
    gkamysz's Avatar
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    RE: OS 56 Alpha FS - RPM readings

    The TT-75 is weak based on the numbers I've found here. The FSa-56 out performs it, but haven't run mine yet.
    Greg

  21. #21

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    RE: OS 56 Alpha FS - RPM readings

    Yes...absolutely....I run my TT F75s about at 9650 RPM with a Graupner 12.5x6....

    And accordign to that, the 56 alpha is a way much better than many 70 4 stroke engines including magnums, and the engines around the same displacement...

    I'm really impressed that a 56 can turn a 13x6 so good.


    @Cherokee flyer.

    Can you tach your engine?,.... that runs very good and etc...does say that it is a good engine, but doesn't tell much about power and doesn't work to comapre engines...because the flight performance you get is with the combo engine, plane you have...
    Mine runs very good, no flame outs, do a great job on my plane...but...


    Saludos,

    Jorge
    Jorge Andres Estrada

  22. #22
    Kostas1's Avatar
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    RE: OS 56 Alpha FS - RPM readings

    Really ,

    10k RpM with an APC 13x6 ?

    That's
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