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Thread: OS 40VF Info


  1. #1

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    OS 40VF Info

    Just wonder is this a good speedy little engine? I haven't been able to find any info on it

  2. #2
    downunder's Avatar
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    RE: OS 40VF Info

    They're wonderful engines and the only OS I'll ever use but my application has nothing to do with speed even though I use a pipe with them. Their port timings are actually very mild which is exactly what I want, lots of low down torque. I've never seen any HP figures for them but judging by their port timings I'd suspect they get peak HP at around 15,000 revs.

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    RE: OS 40VF Info


    ORIGINAL: downunder

    They're wonderful engines and the only OS I'll ever use but my application has nothing to do with speed even though I use a pipe with them. Their port timings are actually very mild which is exactly what I want, lots of low down torque. I've never seen any HP figures for them but judging by their port timings I'd suspect they get peak HP at around 15,000 revs.
    Brian, I have some Venturi for you......
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    RE: OS 40VF Info

    In an old thread I dug up the futaba support guy called it essentially a rear exhaust .40 FSR, and recommended settting it for about 13k on the ground with a pipe, which I guess would put it in the low to mid-14's in the air..? Does this jive with what you've seen? Just curious as I am close to scoring a NIB .40 FSR.. more wheedling required.

    MJD

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    RE: OS 40VF Info

    OS rated the 40VF ABC at 1.25 HP @16,000 RPM. The 40FSR ABC was rated at 1.2HP@16,000RPM and the 40FSR was rated at 1.15HP@ 16,000RPM. This is off the OS engine spec sheet.

  6. #6
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    RE: OS 40VF Info

    There you go - they all sound mighty similar. So it's no giant-killer, but a decent strong .40 anyways.

    MJD
    Sorry I'm late dear, I had to help my uncle Jack off his horse.

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    RE: OS 40VF Info

    What airframe are you using the 40 VF in?

  8. #8
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    RE: OS 40VF Info

    ORIGINAL: Broken Wings
    Brian, I have some Venturi for you......
    Yeah, you know what I use the VF's for . Quite unknowingly to them, OS happened to make an engine that was superlative as a piped CL stunt engine when they first began to be used as a way of using a loophole in the American rules for line sizes. Large (.60 size) engines were beginning to ne used but those rules (for engines larger than a .40) called for larger diameter lines which were heavier and caused more drag. Enter the piped 40VF which was not only dead easy to set up with a pipe but gave roughly the same power as the ST 60's but could still use the thinner lines. Even today, the 40VF is the standard against which all other piped 40's are judged and they're quite sought after still. Apart from the extra power from the pipe, a side benefit was that the pipe acted as a speed regulator by holding the revs constant which helped keep airspeed more constant.

  9. #9

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    RE: OS 40VF Info

    The engine I am looking at has a carb on it. I do fly CL are venturies still out their? Also whats a good CL airframe for this engine

  10. #10
    downunder's Avatar
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    RE: OS 40VF Info

    Venturis are available from SSW and there's a good post on setting up a 40VF here at post #6.

    As for which model would suit, just about anything available . I'm using mine in an overweight (68 ounce) model with 680 sq inch wing and it has no problem at all.


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