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  • Re: Marvel Schebler float to replace Bing floats

    by » 5 years ago


    Not sure it's quite that straight forward. It seems to me that the key parameter is the depth of the horizontal float pins below the top edge of the bowl, actually the depth below the float lever arms. That's a function of the displacement of the float, the material used (buoyancy), position of the pin in the float body, etc. The 7 gram Rotax limit is their way of combining all that into something we can measure to determine good/bad with their floats.

    I'm frankly tired of replacing my floats - my 4th set just went bad (almost 600 hrs on the engine). I'm certainly not impressed with the quality of the Bing floats, or rather, I'm highly negatively impressed.

    I'm actually experimenting with the MS floats. I measured the pin depth of known good Bing floats and the MS floats and found that the MS pin depth was approx. 1/32" lower than the Bing floats which means a slightly higher fuel level in the bowl - I wasn't sure how that would affect engine running. I've just recently started test flying the MS floats. I've been approaching it carefully and only have about 5 hrs on the MS floats. Various power settings from low RPM to WOT, altitudes, attitudes, multiple take-offs, etc. So far I don't see any difference between the MS floats and the Bings. Power, temperatures, etc. all seem perfectly normal so far.

  • Re: Marvel Schebler float to replace Bing floats

    by » 5 years ago


    Hi,

    There are many problems to use too heavy floats so I think it's not a good idea to take this risk. Like you I'm not please with the Bing/rotax parts sure if MS can do a litle bit light it will be the solution but I have an idea because of the material (epoxy) may be it's possible to file them lighten?

  • Re: Marvel Schebler float to replace Bing floats

    by » 5 years ago


    There are many problems to use too heavy floats so I think it's not a good idea to take this risk. Like you I'm not please with the Bing/rotax parts sure if MS can do a litle bit light it will be the solution but I have an idea because of the material (epoxy) may be it's possible to file them lighten?


    I suppose removing material is a possibility. My MS floats were 7.3 g and 7.49 g. That would be about a 4% & 7% reduction respectively just to get to the maximum weight of 7 g. I still believe that pure weight isn't the real critical parameter but rather the fuel level in the bowl which is a function of the needle valve activation which is a function of the float pin height and float lever arm position. We have no way to measure bowl fuel level so the Rotax folks gave us another way to check: <= 7 g WITH THEIR FLOATS. We don't know how that applies to the MS floats. Maybe analogous, maybe not.

    You're right, though, there is some risk that the MS floats won't improve the situation but, even if that was the case, it's no worse than what I've experienced when my Bing floats sunk in the bowl. I'm approaching these flight carefully so I can detect any abnormalities as soon as possible. So far, after almost 7 hrs of operation, everything seems normal. YMMV

  • Re: Marvel Schebler float to replace Bing floats

    by » 5 years ago


    The level is mastered by the weiht so if you remove material and get the right position for the fork float it will be ok.

  • Re: Marvel Schebler float to replace Bing floats

    by » 5 years ago


    Whatever happened to hollow, very light weight, no way they will sink, brass floats?

    Alan

    Thank you said by: Wayne Fowler

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