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  1. #1

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    O.S 1.20AX Owners. Post your tach readings

    My 120AX run at

    8400RPM , APC 16X8
    7700RPM , APC 10X10

    10% nitro , sea level

  2. #2
    seanychen's Avatar
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    RE: O.S 1.20AX Owners. Post your tach readings


    ORIGINAL: vlado

    My 120AX run at

    8400RPM , APC 16X8
    7700RPM , APC 10X10

    10% nitro , sea level
    Try Master Airscrew Classic 16x8. I got 9400 with that prop.
    E_Total = M*G*H + 1/2 M*V^2
    When H=0, all of airplane\'s velocity becomes crash energy!

  3. #3

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    RE: O.S 1.20AX Owners. Post your tach readings

    i got 9400rpm with APC 15X8 10% nitro , but i think is better to know the thrust.

  4. #4
    chrisri01's Avatar
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    RE: O.S 1.20AX Owners. Post your tach readings

    I just started breaking my 120AX in last weekend... only 1 tank so far:
    APC 17X6, Byron 10% nitro / 20% oil, Sea Level
    8800 RPM
    9100 RPM peak (cold)

  5. #5
    Zippi's Avatar
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    RE: O.S 1.20AX Owners. Post your tach readings

    I'm using the same prop and fuel on mine and have about one gallon through it so far. Hopefully I'll maiden my Laser in a couple weeks to see how this engine runs and pulls the plane.
    ORIGINAL: chrisri01

    I just started breaking my 120AX in last weekend... only 1 tank so far:
    APC 17X6, Byron 10% nitro / 20% oil, Sea Level
    8800 RPM
    9100 RPM peak (cold)
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    "It Ain't Lookin Good"
    http://www.evansvillercclub.net

  6. #6
    seanychen's Avatar
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    RE: O.S 1.20AX Owners. Post your tach readings

    chrisri01

    How did you photo the thermal map of your 120 AX, as in your avitar?
    E_Total = M*G*H + 1/2 M*V^2
    When H=0, all of airplane\'s velocity becomes crash energy!

  7. #7
    chrisri01's Avatar
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    RE: O.S 1.20AX Owners. Post your tach readings

    I used a Flir E25 infrared thermal camera that I was able to borrow. I posted a few more in my gallery. Can't wait to fly it!

  8. #8

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    RE: O.S 1.20AX Owners. Post your tach readings

    hi , i got 8500RPM on Zinger 16X6 , 5% nitro , sea level

  9. #9

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    RE: O.S 1.20AX Owners. Post your tach readings

    Running very rich, with 3 or 4 tanks through it, I got 9600 RPM , APC 16X6

    10% nitro , sea level

    Malcolm

  10. #10
    RoughLandin's Avatar
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    RE: O.S 1.20AX Owners. Post your tach readings

    Update on the OS 120 AX in the H9 Showtime.

    Amazing engine, still only have about 6 full tanks through it but very happy. I'm spinning an APC 17x6 prop.


    Exhaust report:
    I was using a shortened Bisson muffler specifically made for this engine I then chopped down the expansion chamber about 2 inches to make it fit in the cowl, then narrowed the exhaust diameter to replace the lost of back pressure. With this combo I was getting about 8400 RPM far less than the reported 9200. This combo will hover at about 3/8 throttle and has great pull out even at these lower RPM numbers.

    I then switched to the stock Powerbox muffler with the pitts adapter and immediately got 8900 RPM. I figure this will improve closer to the 9200 as the engine completes break-in phase. The sound is improved (quieter but deeper), at lower RPM it now doesn't have that irritating 2 stroke rattle/ratatattat sound that it had with the Bisson though full throttle does not sound as impressive. I figure the increase in backpressure will help transition performance (still breaking in) but I'm really excited about the extra 500 instant RPMs. I have not flown this combo yet.

    All figures are using 15/15 PowerMaster fuel at sea level.

    I may also try the APC 16.5x5W prop and switch to a plastic spinner to reduce weigh and improve transition performance. How are every one elses transitions, last several engines were 4 strokes which seam a little better in this area... [&o]
    When she comes down, just hope it\'s still under control

  11. #11

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    RE: O.S 1.20AX Owners. Post your tach readings

    New reading

    Mertz wood 16x10

    10% Nitro, 20% syntetic-castor oil

    1800 ft

    RPM 7,550

    Regards

  12. #12
    CGAV8R's Avatar
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    RE: O.S 1.20AX Owners. Post your tach readings

    8900 with APC 17X6, muffler baffle in, coolpower 20/20, sea level, 90 degrees, 6 tanks through it. I have the idle set at 2250 and the transition is good.

    Aaron D.

  13. #13

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    RE: O.S 1.20AX Owners. Post your tach readings

    APC 14x12, 10% Nitro 20% oil, peaked @ 9000rpm, richened down to 8700rpm for flights.

  14. #14

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    RE: O.S 1.20AX Owners. Post your tach readings

    ¿ anyone with APC 18x6 ?

  15. #15

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    RE: O.S 1.20AX Owners. Post your tach readings

    I added a four chamber quiet pipe to my 120AX and now it is turning that same APC14x12 @9800rpm[sm=thumbup.gif][sm=teeth_smile.gif] The plane is going like crazy[sm=wink_smile.gif]

  16. #16

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    RE: O.S 1.20AX Owners. Post your tach readings

    WOW , what pipe do you have ?

  17. #17

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    RE: O.S 1.20AX Owners. Post your tach readings

    I have the flatdisk pipe made by the Just engines for the 160-180 engines. It is called "Purple Pipe" but is also available in aluminium finish.

    I forgotten to attach the link to the JE, here it is now.

    http://www.justengines.unseen.org/pipesjen.htm

  18. #18
    Moderator Hobbsy's Avatar
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    RE: O.S 1.20AX Owners. Post your tach readings

    Graupner 15x8, Fox 5% fuel/20% castor=9,475
    Farmall 240 the final issue of the Farmall C, Super C, 200, 230 series.
    122 Cu. In. 22 hp. A small tractor that would do big work due to its 10x36 inch rear tires.

    As competition improves products, the differences between them get smaller and smaller

    Club Saito member #5

  19. #19

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    RE: O.S 1.20AX Owners. Post your tach readings

    APC 16x6 on Powermaster 5% with the new version of the Bisson pitts which has been changed to deliver more pressure to the tank. I got an easy 9600 but didn't want to push it any more. I tuned it to fly at 9200. I would like to try a lighter wood prop to see if I can get closer to a 4 stroke transition but it wasn't bad. Does anyone know what the upper RPM limit of this motor is?


    ORIGINAL: RoughLandin

    Update on the OS 120 AX in the H9 Showtime.

    Amazing engine, still only have about 6 full tanks through it but very happy. I'm spinning an APC 17x6 prop.


    Exhaust report:
    I was using a shortened Bisson muffler specifically made for this engine I then chopped down the expansion chamber about 2 inches to make it fit in the cowl, then narrowed the exhaust diameter to replace the lost of back pressure. With this combo I was getting about 8400 RPM far less than the reported 9200. This combo will hover at about 3/8 throttle and has great pull out even at these lower RPM numbers.

    I then switched to the stock Powerbox muffler with the pitts adapter and immediately got 8900 RPM. I figure this will improve closer to the 9200 as the engine completes break-in phase. The sound is improved (quieter but deeper), at lower RPM it now doesn't have that irritating 2 stroke rattle/ratatattat sound that it had with the Bisson though full throttle does not sound as impressive. I figure the increase in backpressure will help transition performance (still breaking in) but I'm really excited about the extra 500 instant RPMs. I have not flown this combo yet.

    All figures are using 15/15 PowerMaster fuel at sea level.

    I may also try the APC 16.5x5W prop and switch to a plastic spinner to reduce weigh and improve transition performance. How are every one elses transitions, last several engines were 4 strokes which seam a little better in this area... [&o]

  20. #20
    Moderator Hobbsy's Avatar
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    RE: O.S 1.20AX Owners. Post your tach readings

    From the Tower- OS specs. Practical RPM: 1,800 - 9,500
    Farmall 240 the final issue of the Farmall C, Super C, 200, 230 series.
    122 Cu. In. 22 hp. A small tractor that would do big work due to its 10x36 inch rear tires.

    As competition improves products, the differences between them get smaller and smaller

    Club Saito member #5

  21. #21
    Berwyn Bill's Avatar
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    RE: O.S 1.20AX Owners. Post your tach readings

    APC 17x6
    Omega 15%
    Stock Muffler
    600' ASL
    8900 rpm

    Best prop I've found yet for my 1.20. The prop-braking on downlines is just about perfect for my taste. Would like to try a 17x6 Xoar though.

  22. #22

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    RE: O.S 1.20AX Owners. Post your tach readings


    ORIGINAL: Berwyn Bill

    APC 17x6
    Omega 15%
    Stock Muffler
    600' ASL
    8900 rpm

    Best prop I've found yet for my 1.20. The prop-braking on downlines is just about perfect for my taste. Would like to try a 17x6 Xoar though.
    Hi Bill,

    I am running a Menz wood 16x6 and getting 10K on 10% with the pits muffler. I find that the spool up is really quick with the lighter prop and the performance is really similar to APC's. I tried Zingers and they were really bad. Do you get a super strong hover pullout with the 17x6. I was going to try it but thought it might kill off too much speed. Wood is definitely the way to go on this engine though.

    If you check out the new OS 200 four stroke it puts out 2.9HP at 9000 RPM. Were getting the same on a much lighter and less expensive engine. I love this thing.

  23. #23
    Berwyn Bill's Avatar
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    RE: O.S 1.20AX Owners. Post your tach readings

    ORIGINAL: rino


    ORIGINAL: Berwyn Bill

    APC 17x6
    Omega 15%
    Stock Muffler
    600' ASL
    8900 rpm

    Best prop I've found yet for my 1.20. The prop-braking on downlines is just about perfect for my taste. Would like to try a 17x6 Xoar though.
    Hi Bill,

    I am running a Menz wood 16x6 and getting 10K on 10% with the pits muffler. I find that the spool up is really quick with the lighter prop and the performance is really similar to APC's. I tried Zingers and they were really bad. Do you get a super strong hover pullout with the 17x6. I was going to try it but thought it might kill off too much speed. Wood is definitely the way to go on this engine though.

    If you check out the new OS 200 four stroke it puts out 2.9HP at 9000 RPM. Were getting the same on a much lighter and less expensive engine. I love this thing.
    Rino,

    I like wood props on a lot of my planes but the APC is available at my LHS and not too pricey (club discount is nice too). The hover pullout is astounding on my Fusion 90 (7# 7 oz), Estes rocket-like. With the 17" dia. the surfaces really come alive and it smooths out everything. As far as killing off speed, iot does have considerable braking power but I like that for practicing IMAC and keep my figures smooth and clean.

    I'm sure the Menz is great but the APC is damn good too, wood or not. Spool up on the APC is very nice and overall transition is smooth and linear.

  24. #24

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    RE: O.S 1.20AX Owners. Post your tach readings

    9,500 dead on, cool power 5%, really owns, apc 17x6, stock muffler, lovin it.

  25. #25

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    RE: O.S 1.20AX Owners. Post your tach readings

    Malcolmm--What muffler are you running ???


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