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Thread: Zenoah G-62SL


  1. #1

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    Zenoah G-62SL

    APC 22x10: 7400rpm
    APC 24x8: 7100rpm

    Toni Clark rear-mounted 3-chamber silencer.
    Toni Clark carb manifold and trumpet (velocity stack??) intake.
    Toni Clark Hydromount (softmount).

    New engine. 4 gallons

    Temp: About 80°F

    Very quiet ΄bout 94dB measured at 10ft
    Regards
    Tinus

    Flying:
    BUSA 1:3 scale Super Cub / Zenoah 80

    Building:
    Frisch 1:3 scale PZL Wilga / King 140RV
    Own design 1:3 scale Yak-50 / Geared Zenoah 124 inline

  2. #2

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    RE: Zenoah G-62SL

    Update.

    Since this 02 post I have been running a few G-62Β΄s, mostly on Menz props, but recently I had the good fortune of trying out the Fiala line of props. http://www.vrtule-fiala.cz/index.php?lang=en

    My current G-62 is mounted on a 1:3 scale Hostetler Tri-Pacer, weighing in at about 37lb. Engine is a stock G-62, outfitted with the newest type of stock silencer with both outlets fed into a single 15mm stainless pipe leading out the cowl, and a Toni Clark 90Β° carb elbow, making the carb face to the rear, and a carb stack.
    This setup spins a Fiala 26x8 at 6100 rpm, and power is comparable to the Menz 24x10 that was used previously.

    Most takeoffs are performed at about 2/3 power, with cruise being around 1/3 to 1/2 power. Full power results in a 40Β° climb which is a LOT more than the full size Tri-Pacer is capable off...:-)

    Since power is more than plenty I have ordered a Fiala 26x10 prop to lower the rpm a bit, but being a lightly loading prop I may try a 26x12 to get the rpm down to about 5000 on full power.

    Oh, and by the way, idle is rock steady at about 1000 rpm with almost no vibrations, and starting is the easiest I have ever tried. One or two flips with choke on, and one to three flips to start. When the engine has been run recently, one single flip usually has it puttin away again....:-)

    And yes, I DO know that the ZenoahΒ΄s likes to spin up to put out the most power, but over the years I have developed a taste for quiet, smooth engines, both of which are aided by low rpm and large props. And personally I like the low humming at 5K much better than a screaming engine powering away at 7 to 8K.
    And if I need the extra power, IΒ΄ll mount a bigger engine, also running a large prop..:-)
    Regards
    Tinus

    Flying:
    BUSA 1:3 scale Super Cub / Zenoah 80

    Building:
    Frisch 1:3 scale PZL Wilga / King 140RV
    Own design 1:3 scale Yak-50 / Geared Zenoah 124 inline

  3. #3

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    RE: Zenoah G-62SL

    Tinus,

    Can the G62 handle the Fiala 26x10-12? I have been running my G62 with an apc 22x10. If I can run it with a Fiala 22x12 or a 24x12 without overheating then it would be better.

    Ton2di

  4. #4

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    RE: Zenoah G-62SL

    I have not recieved the Fiala 26x10 yet, so I donΒ΄t know how it runs with it, but my guess is that max rpm will be around 5.500, which should suit me slightly better.
    Even though I have always run my G-62Β΄s with rather big props, I have yet to experience any overheating issues. Not even when I used one on a towplane, going full tilt for several minutes, pulling heavy gliders.

    Do you know PΓ© Reivers prop calculator spreadsheet?
    http://www.mvvs.nl/prop-power-calculator.xls
    According to this the Fiala only loads with a prop constant of 0,8, although my own limited experiences indicate closer to 0,98, but both values are lower than the APC which means that you can mount a bigger prop and still get the same rpm as with your current APC, or mount a similar size prop and see a rise in rpm.
    Personally I would go for the bigger prop, which also has the advantage of making starting much easier, as well as lowering, and smoothing, the idle.
    Regards
    Tinus

    Flying:
    BUSA 1:3 scale Super Cub / Zenoah 80

    Building:
    Frisch 1:3 scale PZL Wilga / King 140RV
    Own design 1:3 scale Yak-50 / Geared Zenoah 124 inline

  5. #5
    MetallicaJunkie's Avatar
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    RE: Zenoah G-62SL

    great numbers but if a bigger prop look is what you are after Fiala props are OK...they load very lightly on my DLE55 on a 22x8 i got over 8k rpm, and about 7500 or so on the 23x8....i would have to look back in EFFing Gints to be for sure

    keep us posted

    where did you find a prop power calc with Fiala props programmed in it? *edit got it thanks!
    \"Propellers are notorious for inflicting serious bodily harm while vigorously defending their space\" George Aldrich

  6. #6

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    Did a few testruns with my old G-62 sporting RCexl ignition and a Mick Reeves Torquemaster unit. No exhaust.

    3W 32x12 2-blade: 4100 rpm (7200 rpm on the crank, perfect)
    Menz 26x12 4-blade: 4600 rpm (a bit too small, 8000 rpm on the crank)
    Fiala 28x10 2-blade: 5150 rpm (too small, 9000 rpm on the crank)

    I have a second G-62 available which will be used to make a 124cc inline with the Torquemaster unit fitted onto the front engine. I΄m 90% finished with the coupling part. Just need to cut the keyway and drill the holes so that it can be mounted to the rear engine flywheel.
    Eventually it will be fitted with a single tuned pipe, and according to my informations the power should be comparable to that of a Moki 250 radial. Same props at almost the same rpm, so that΄s what I΄m shooting for.
    When the engine is finished I΄m hoping to be able to swing a 32" 3-blade prop with enough pitch to provide good speed. Something around 18-22" hopefully.


    __________________________________________________ __________________________________________________ _______________________________
    Updated numbers with tuned pipe and with canister.

    KS 1060 pipe, header 22 cm (8,66 in) / total tuned length 69 cm (27,16 in)
    SEP (Wilga) 32x10 2-blade: 4000 rpm
    3W 32x12 2-blade: 4300 rpm (7,9 hp according to Pι΄s calculator)
    Menz 26x12 4-blade: 4350 rpm (5,8 hp, header much too long I think)

    Toni Clark DA-50 canister, header 22 cm (8,66 in)
    SEP (Wilga) 32x10 2-blade: 3900 rpm
    3W 32x12 2-blade: 4200 rpm (7,1 hp)
    Menz 26x12 4-blade: 4350 rpm (5,8 hp)
    Fiala 28x10 2-blade: 4950 rpm

    The power delivery is much smoother with the canister, and the install much easier, so I will most likely settle on this solution.
    When the inline engine is ready I will test with both tuned pipe and canister again though.
    Last edited by Pelle Gris; 09-28-2013 at 08:16 AM. Reason: Updated data
    Regards
    Tinus

    Flying:
    BUSA 1:3 scale Super Cub / Zenoah 80

    Building:
    Frisch 1:3 scale PZL Wilga / King 140RV
    Own design 1:3 scale Yak-50 / Geared Zenoah 124 inline

  7. #7

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    After removing the reduction drive, I did a few test runs with both canister and pipe. Numbers below.

    Menz 24x8: 7.000 / 7.100
    Menz 24x10: 6.550 / 6.700
    Fiala 26x8: 6.300 / 6.600
    Fiala 26x10: 5.900 / 6.300

    Header and tuned length as above.
    The numbers seem to suggest, that the header is too long for high rpm direct drive, as the performance gain was biggest in the low rpm region.

    The parts for the inline should be ready within a few weeks, and I΄m looking forward to running it, and see if the performance is as expected.
    Regards
    Tinus

    Flying:
    BUSA 1:3 scale Super Cub / Zenoah 80

    Building:
    Frisch 1:3 scale PZL Wilga / King 140RV
    Own design 1:3 scale Yak-50 / Geared Zenoah 124 inline


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