Recent content by Vigilant1

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    B&S 49-series (810cm3/49ci) for aircraft use - TiPi's Q&A thread

    Here's a picture of an SD-1 with the 49-series engine driving a prop from the flywheel end. Given the prop pitch, it is turning CCW as viewed from the cockpit. If we turn the engine around so the PTO is in front (as TiPi plans to do), the engine would be turning the...
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    Power generating

    That's it. Proving it is more trouble than it is worth, IMO. But, you could spend a day in research to figure out the two-way total efficiency of this wind generator-into-battery-back-to-prop setup (expect a very dismal number). Figuring out the conversation efficiency of the...
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    Power generating

    Two major questions to answer I think: 1) How often would "extra" energy really be available? All that potential energy available at cruise altitude can be put to very good use with a well planned descent. If we are "harvesting free energy" with a later, draggier descent, then we stayed at...
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    Forum made EFI?

    Gonna drag out all that discredited Ideal Gas Law flimflam, are ye? :) I should have said: With decreasing temperature, the passing gasses take an increasingly large amount of heat from the hot wire in the MAF for the same air mass. This effect is larger than would be predicted based...
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    Forum made EFI?

    Any suggestions/ideas about suitable crank (aka "RPM") sensors for use in triggering a simple analog EFI system on a small industrial engine? One trigger per rev would be best, but every other rev is okay, too. There's a lot of magnetic "stuff" going on with the stock flywheel (magnets for the...
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    Forum made EFI?

    The Kawasaki system is what is commonly known as "staged injection," and the write-up looks to have a big dose of marketing mixed in. I don't know about the claimed particulars of the advantages of staged injectors in this high rev 2 stroke application. I do know that staged injection is well...
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    Garner's electro-fluidic autopilot - thermistor information

    Good find, really neat. I can't imagine Sport Aviation running anything like that today (updated to use Arduinos, etc). It is too bad. Analog circuits, fluidics, etc-- you had to be really smart and try a lot of things to make something work. In retrospect these devices are easy to...
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    Forum made EFI?

    I agree, for what that's worth. But an additional complication arises with temperature. In theory, any effects of temperature on the density of the incoming air volume would already be included in a measure of its mass. But, almost all modern MAFs work by detecting the air's cooling effect on...
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    Garner's electro-fluidic autopilot - thermistor information

    Wow, an esoteric subject fer sure! Fun. Fenwal Controls is still in business, maybe contact them and see if you can find out about their old thermistors--part numbers, alternate part numbers, old spec sheets or data sheets, if that product line was sold to another company, etc. Some old coot...
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    Forum made EFI?

    MAFs are good for OEM applications where it isn't hard to engineer a plenum to assure smooth airflow over the sensor. A lot harder under the right constraints of a cowl, and in the turbulent, high pulse world of a single cylinder runner. There's gonna be some flow reversal, maybe even with...
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    Forum made EFI?

    It seems to me that a significant challenge that might sound simple is figuring accurately how much air went in--the mass of it. And if we aren't using a fuel table, we need a formula that captures a lot of different variables-- no such formula is spot-on for real engines in the real world...
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    Forum made EFI?

    Thanks, and good to know. This might be appropriate to post in the Supplier and Manufacturer Announcements area. Also: - Could you include a link directly to the page on your site that covers this product? - What is the product's name? Is it the same or different from the ”Flame-power 4/4"...
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    What happened to the Ultravair?

    Right. And they are still making brand new parts for the VW Type 1, no need to cut anything if you want 75 HP. Still, apparently the idea of cutting up Corvair cases and heads has fans for various reasons. I'm just wondering if getting old parts to modify is easy and cheap.
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    What happened to the Ultravair?

    Are the 6 cyl Corvair cases, heads, camshafts, and cranks so common and so cheap that it makes sense to cut them up to make a 2 or 4 cyl engine?
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    WHIRLWIND PROP

    See the posts from TxFlyguy. Here's one thread, there are more:Whirlwind Propeller Company, El Cajon, CA I this a prop you'll need within the next 5 years?
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