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  1. Replies
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    Update - Still suspicious but no further engine...

    Update - Still suspicious but no further engine stumbles after adding ram air to the cowl tank and baffling to the gascolator and fuel line insulation. I do see a change in EGT with cowl tank fuel...
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    8,342

    3M makes weather proof white address labels that...

    3M makes weather proof white address labels that seem to stick like all fury. They come as an 8 1/2 by 11 inch sheet of 30 individual labels per sheet, and can be imprinted with a computer word...
  3. Minnesota had such a license fee many years (like...

    Minnesota had such a license fee many years (like 45+) ago and then dropped it when there was some ruling that said there was no legitimate reason for them to be charging such a fee for a federal...
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    My opinion is that I would rather use a tired old...

    My opinion is that I would rather use a tired old but still running OK engine on a first flight than a freshly overhauled one. The well used engine won't surprise you with infant mortality failures,...
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    Log-Log and Semi-Log graph paper is dangerous...

    Log-Log and Semi-Log graph paper is dangerous stuff to put in the hands of long range planners without an engineering or math degree:rollseyes:.....
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    If you are looking for the ~2.5 mm dia plug on...

    If you are looking for the ~2.5 mm dia plug on the end of about a 5 ft cord, and just plain tinned wires at the other end, PM me. I have three left over from my ICom conversion project. I used...
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    52,199

    I installed a Piper ground service plug and...

    I installed a Piper ground service plug and receptacle on the instrument panel & use that for electric starting on my J4A. On the ground at my hangar, I use an Odyssey PC680 (I could use a boat...
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    21,915

    Use one or more large leaf blowers to drive it. ...

    Use one or more large leaf blowers to drive it. From the prop I'd guess it spins maybe 3000 rpm at max output. It has to be a really draggy thing though.
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    . Agree - except it is not credible from E10...

    . Agree - except it is not credible from E10 suppliers until unavoidable water is included in the E10 mixture. The boat people probably have the most relevant experience.
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    Yes there is definitely a substantial octane...

    Yes there is definitely a substantial octane reduction, plus the fuel is now saturated with dissolved water. Assuming the octane is still adequate it would work, but the residual dissolved...
  11. Ceconite / Randolph product dope & thinner surplus

    Having finished my J4A project, I still have roughly 7 gallons of Randolph product butyrate thinner, 3 gallons of Randolph Butyrate original Piper Yellow (Lock Haven yellow) dope, 5 gal of butyrate...
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    27,306

    The C-85 really puts new life in the old girl. I...

    The C-85 really puts new life in the old girl. I can't imaging the original J4s having a 65hp (even some with 55 hp) with full old electric (6 V yet). I wonder what the empty weight that was...
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    I can't find the original thread that pointed it...

    I can't find the original thread that pointed it out, but someone noted the nice soft J-4A oleo gear & that I should appreciate it. Wow! Have I ever learned in spades as this old 172 driver had to...
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    37,249

    A very belated update - I ended up epoxying a 1/4...

    A very belated update - I ended up epoxying a 1/4 inch od curved pitot tube to the vent of the cowl tank cap. I also added a metal box around the firewall-mounted gascolator after I found the...
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    16,302

    I find it works well to first just hand prop and...

    I find it works well to first just hand prop and let the engine bounce thru compression with closed-throttle-switch-off-mixture-rich to "juice" up the engine, maybe using a little prime only for a...
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    A quick update on my J4A fuel supply with a C-85...

    A quick update on my J4A fuel supply with a C-85 and cowl tank.

    I added a 1/4 dia forward facing pitot tube to the fuel cap using epoxy, added an aluminum doghouse around the firewall-mounted...
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    That list is a gross simplification. It assumes...

    That list is a gross simplification. It assumes only ethanol and presumably a hydrocarbon, but not the simultaneous presence of water. Compatibility with water has to be included in any system...
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    Engines can certainly all operate with E10. But...

    Engines can certainly all operate with E10. But maybe the real issue is that E10 cannot be made compatible with float type carburetors because they let the fuel be exposed to air. Fuel injection...
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    My hangarmate's C-140 had his fuel line swell...

    My hangarmate's C-140 had his fuel line swell nearly closed running on partial (~E5) ethanol laced fuel. Turns out the airport had been getting "certified E0 loads" that were actually E10. He...
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    Does anyone know what the octane of typical E10...

    Does anyone know what the octane of typical E10 Mogas would be if the ethanol iss striped out of it? Certainly it could be used in a lawnmower etc but it would definitely require further...
  21. I use 160 differential degF to give .001 in/in...

    I use 160 differential degF to give .001 in/in expansion difference between steel and aluminum. Same in mm/mm or ft/ft for 160 degF.

    Remember the parts also have to be straight and...
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    Good point. The problem with a fillet weld is...

    Good point. The problem with a fillet weld is that it is already precracked on the invisible side. That crack will propagate if there is flexing from tension-compression. Worse, the cracked side...
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    If you have access to a milling machine, there...

    If you have access to a milling machine, there are 3 inch dia slitting cutters as thin as .005 inch, & maybe even thinner. You'd have to hold it by the flanges, or with a saddle type fixture on the...
  24. OK that passes the theoretical test. A single...

    OK that passes the theoretical test. A single offset weight will work for both static and dynamic balance - providing it is properly located along the axis of rotation. I'm still surprised...
  25. I'm surprised the Hummel 1/2 VW engine can be...

    I'm surprised the Hummel 1/2 VW engine can be balanced with only only a single predetermined offset weight. Given the amount of engine modification (i. e. cutting away 1/2 of it!) theoretically I...
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