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  1. #1
    Luxuswaffe's Avatar
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    Super Tigre GS-45 ABC Readings

    10x6 APC 13,600
    10x9 MA 12,300
    11x7 APC 10,400

    Sealevel (Florida)
    90 degree F
    60% humidity
    15% Nitro/18% Oils PM
    Macs Muffler, not tuned
    BalsaUSA Brotherhood #49
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    "They're called missiles." Revver Bro #181

  2. #2

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    RE: Super Tigre GS-45 ABC Readings

    ST .45 Italian made with torpedo muffler and exhaust deflector

    10 x 7 APC
    12,800
    2900/3000 idle - If left idling it would drop to 2200 rpm without dropping dead.
    4# 15 oz to 5# 2 oz thrust

    10 x 7 MA Simitar
    13,800
    2900/3000 idle
    5# 6 oz to 5# 9 oz thrust

    10 x 7 MA old style
    12,300
    3200/3400 idle - seemed to need a higher idle than other props
    5# 7 oz to 5# 8 oz thrust

    The results were surprising and unexpected. Usually I expect APC to outperform old style MA. However in the 10 x7 size it appears that MA has a strong advantage. Similar data for an OS .46 shows the same trend, lower rpm but more thrust.

    Bill

  3. #3
    P-40 DRIVER's Avatar
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    RE: Super Tigre GS-45 ABC Readings

    It will in the air. The MA turn up higher due to decreased pitch caused by flexing and design etc.

  4. #4
    Moderator blw's Avatar
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    RE: Super Tigre GS-45 ABC Readings

    The rpms taken on the ground are misleading. This is only applicable for conditions on the ground, and not when flying. Any means of measuring performance for props for flying conditions must include the models airspeed into things. This means that static measurements are only half of the numbers needed. If the MA is flexing (or coning) then efficiency will drop as larger diameters increase prop efficiencies.

    If one has to look for tradeoffs in prop efficiency, increased diameter is more effective than prop rpm.
    The ultimate responsibility of pilots is to fulfill the dreams of the countless millions who can only stare skyward...and wish.

    "It's a new day for Auburn" - Gus Malzahn

  5. #5

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    RE: Super Tigre GS-45 ABC Readings

    APC 12x4
    500ft above sea level
    5 degrees C

    10% nitro, 18% synth oil

    13,500rpm

    Z

  6. #6
    Lille-bror's Avatar
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    RE: Super Tigre GS-45 ABC Readings

    China-model, stock muffler, Rossi 4 plug, 0% nitro, 3% castor, 15% Aerosynth2 (this mix gave the best performance, when I wanted no nitro and 3% cator). Cylinder modified (+180 rpm). Sparybar turned 90 degree to avoid rich middle range. Very good throttle response with all props.
    Weather: 16 degree Celsius, showers, sea level.

    11/5 APC:
    Idle 2700 rpm.
    Top 10680 rpm.

    - Best HP of the testes props. Tried higher compression (tested by Downunder) but stopped it, due to leak in the manifold.

    !0/8 APC:
    Idle 3400 rpm.
    Top 10300 rpm.

    - 32% less HP than the 11/5.

    9/8 APC:
    Idle 3300 rpm.
    Top 12400 rpm.

    - 19% less HP than the 11/5.


    The 10/8 is too big. Will try a 10/7 APC, also 12/4 and 9/7.
    Look forward to test a tuned pipe, some time in the future.

    Do you have the muffler as close to the engine as possible or the opposite?
    0% nitro in car fuel? That works! :-)
    http://www.youtube.com/watch?v=ykiffCV4xgk

  7. #7
    Lille-bror's Avatar
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    RE: Super Tigre GS-45 ABC Readings

    Downunder has modified several of his engines, to obtain more power when using 0% nitro. This has been done, by raising the compression.

    I’m also not using nitro, and tried it myself:
    Out of the box, the Super Tigre GS 45 has a clearance of 0,6 mm from the piston to the head – simply measured with a piece of solder, and the engine turned one time over the top dead centre. In the top of the cylinder, there is a cab of 0.25 mm from the inside to the outside. My theory is that some of the effect from the explosion therefore is going outside instead of downside and pressing down the piston. A friend of my took the β€œoutside” ring of, and there bye lowered the cab with .25 mm. Now the total cab is 0.35 mm.

    Tested on bench using 9/8 APC prop, Rossi 4 plug, 0% nitro, 3% castor, 15% Aerosynth2, stock muffler.

    Before modification:
    Max RPM: 12400
    HP (Only on my test stand): 1,27

    After modification:
    Max RPM: 13200
    HP (Only on my test stand): 1,67

    Now, that’s something!!! An increase of 800 RPM and a HP-increase of 24%!!!

    If I can get some 0,05 mm shims, I’ll try to make a more accurate modification.

    When using the stock muffler I could measure a little decrease in torque, if the muffler was pushed as closed towards the engine as possible, than the opposite.
    0% nitro in car fuel? That works! :-)
    http://www.youtube.com/watch?v=ykiffCV4xgk


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