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  1. F

    Diesel direct drive and flat

    Yes, I think so. BTW I think that your 30% superiority of diesel engines vs. gasoline might a bit high. I guess it around 20%. And diesel fuel is somewhat heavier than gasoline. Taking weight as a base the diesel advantage might come in at 10%. I don't know a cure for the diesel pest...
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    Diesel direct drive and flat

  3. F

    Diesel direct drive and flat

    Sorry, I have no DV6 at hand – only 3views of the engine. As with diesel pest propagating with bio-fuel additives I keep my eyes open to gasoline engines too – which might give comparable power even without turbo. The Honda R18 engine is an example: 140hp, single camshaft, collector integrated...
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    Diesel direct drive and flat

    The higher wear of the engine at 3600rpm compared to 2500rpm is not significant, as in car operation the life expectancy of these engines is some 200000km - or more. Installing the engine on a 70°inclination gives you the combination of a centered installation of the drive train, the...
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    Diesel direct drive and flat

    Turning an inline engine on its side with modified oil pan: You might consider a Mercedes A class engine which comes already lying on its side with suitable oil pan. Yes, this area is burnt by Thielert, but the underlying problem was not engine, but reduction adaptation strategy solved later 0n...
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    Honda R18Z9 DIY proof of concept build comment thread

    Hello Keith, I almost know by heart the engine specifications you mention ;-) I found even kits for removing balance shafts (you have to block the lubrication orifices) on these engines – but no indication of the actual weight of the shafts for decision making whether their weight would pay off...
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    Honda R18Z9 DIY proof of concept build comment thread

    Hello Keith, I am happy to discover your thread 3 days ago: For me the Honda R engine is the latest (last?) single camshaft engine suited for AC conversion. There is a thread by Charlie Rosenzweig who is flying a RV6 behind a Honda R engine with SDS EFI and a reduction drive he could get from...
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    Belt drive with elliptical cog wheel?

    Billksy, thank you again for your clear categorization in our latest post which confirms my physical understanding. It is all about preventing the resonance catastrophe coming from one or the other direction. Your comment to the Volkswagen argument shows me that the knowledge of the author is...
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    Belt drive with elliptical cog wheel?

    Once more thank you for your patience, explanations and comments. @Billski I think I will have to re-read your suggested reading. Oh, life is so short... Your impression is correct: I had followed an old thread of commercial gear redrives for Subaru engines from Florida, and the Thielert story...
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    Belt drive with elliptical cog wheel?

    After these well – founded comments I think I can end this path which originated from a constant rpm – frog perspective. My idea came up when I discovered a Volkswagen description of their new engine 211evo series. They use this concept for camshaft drive with a toothed belt claiming some...
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    Belt drive with elliptical cog wheel?

    As we know most of the time a 4 stroke engine is driven by the flywheel. In a 4 cylinder there are 2 power strokes per revolution which keep the thing running – and give rise to the omnipresent torsional vibrations. They might be greatly reduced in a belt drive by using an elliptical (e.g...
  12. F

    motor mount offset for "P" factor

    At least when the airstream reaches the empennage the lever arm is real great; that may be an essential point. Another contribution will result from the fact that a lot of airflow originating from the right half of the prop circle will be shielded by the cowling, reducing the p-factor – but...
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    motor mount offset for "P" factor

    Maybe a dumb question: Instead of keeping (more or less) the spinner tip on the symmetry line of the AC and tilting the engine for some degrees, why not shift the engine some inches to the left without horizontal tilt? With alternative / asymmetric engines that might sometimes simply things. Yes...
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    Is this the lightest ultralight?

    In France I saw a side-by side 2seater which could swing its wing parallel and over the fuselage. It weighs 70 kg (80 kg with fairings)! http://www.ulminimalist.sitew.com/Projet_minimaliste.B.htm#Projet_minimaliste.B Richard
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    OV-10 Bronco - information wanted

    You are right, I re-checked with drawings from POH. Flat-head engine D-motor LF39 ultralight aircraft engine dimensions would easily fit, not much cheating necessary for ULPower Six Cylinder Engines Available Now! - ULPower Blog I shifted the Project to my personal "hanger flying" folder...
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    Hot wired wing plug

    AR, thank You for that hint :) -Richard
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    Hot wired wing plug

    I fully agree with You that best practice is shaping the plug and avoiding to correct concave curves even on the mould. I would however be in the lucky situation to have simple curvatures only. Of course I would try to avoid gaps on the plug first: my intention is to fix the individual foam...
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    Hot wired wing plug

    It is only recently I found this detailed log of hot wiring for mould construction in man carrying AC. However I don't recall the density of foam used. Blue foam (DOW Chemical) or green foam (Styrodur, in Europe) has some 40 kp/m³. From the pictures however I had the impression that white XPS...
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    gas powered planes?

    It is only a few day agothat I discovered that they are just about to convert an ultralightfor LPG use in France: L Would be interesting tofind out how they cope with the weight limitations to 450kg MTOW.
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    gas powered planes?

    I followed the discussion with interest, for at least in Europe LPG cuts fuel cost in half. At present, this is influenced by tax politics (as with Diesel fuel, too), on the long run it is abundant and will have advantages for long term availability. Converting an AC to Diesel requires complete...
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