Recent content by FinnFlyer

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    Minimum clearance from air scoop to fuselage

    I still need to understand the math, but inner radius can be smaller than outside radius. For an inlet designed for one angle of attack and optimized for airflow needed at one airspeed, it doesn't matter. But you'd design for full power at climbing AOA. Bigger outer radius lips then allows for...
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    Looking for best way to level airplane.

    That has not been my experience. Even with most of the tube flat on the floor, if I moved one end of the tube up or down, the water level at the other end also moved. In any case, Eugene did go back and looked at the wall each time and compensated for it. So that works. Just wanted to warn...
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    Looking for best way to level airplane.

    Does it? Now move the tube back to the other wing. (Perhaps I'm missing something here. Please enlighten me.) Finn
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    Looking for best way to level airplane.

    My takeaway from Bill's long post is that having one end of the tube fixed on the wall is not useful. As you move the tube around the volume containing the water will change. Yes, water will always be at same height at both ends, but height relative to floor will change. Example, hold tube at...
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    Looking for best way to level airplane.

    I repent. See edit of post #77. I guess I need to retake my basic physics classes :( Finn
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    Looking for best way to level airplane.

    Seriously?! Did you even read the post I was replying too?? "Take your clear tube and submerge many coils of it into a 5 gal bucket of water ..." You're telling me the laws of physics have changed and the level at the open end will not change as the ambient pressure changes? Never mind. Don't...
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    Looking for best way to level airplane.

    Be aware that you can't use that for day-to-day measurements (or even while a thunderstorm rolls though). In other words, the absolute level varies with air pressure. Finn
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    Looking for best way to level airplane.

    3/8" OD (1/4" ID) may be too small. I used 1/2" OD, 3/8" ID on my RV-4. Used 3/4" thin PVC for hangar/house leveling (60' +) Anyway, test by bringing ends together, move one end up/down slightly, should level out after a few oscillations. That should reveal if any big air bubbles exist and also...
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    Mazda 13b w/ Tracy Redrive

    Is it a 2.17:1 PSRU (RD-1B)? I think the original poster was looking for a RD-1C (2.85:1). Finn
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    My 13B engine configuration (tentative)

    I think one of the reasons Tracy stopped producing the PSRU was increased cost/lack of suppliers. Can't remember for which parts.
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    Big TV vs small TV

    Didn't read all the posts in this thread, but I don't think that TV size determination principles are applicable here. As mentioned, change of focus (outside/inside) would be the determining factor here. That becomes more pronounced as you get older. So, using any 'pad with different font sizes...
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    Mazda 13b w/ Tracy Redrive

    Actually 5W-50 Mobil 1 synthetic is hard to come by now. In any case, Tracy recommends at least 120 deg F oil temp before applying full power. Using the engine oil for the PSRU is a compromise. Ideally you'd have separate oil for the PSRU but that adds complexity with separate PSRU oil cooler...
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    Mazda 13b w/ Tracy Redrive

    I'll increase my coolant temp warning limit. Wasn't aware of stock injector issues. Thanks for the heads-up! Finn
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    Mazda 13b w/ Tracy Redrive

    "We consistently made best power at 210-215deg as measured by the AIM dash reading a calibrated sensor. It will live a very long time at 215deg. It will live a much shorter time at 230deg. At 230deg we noted a consistent tapering off of power. Below 205 deg the engine makes less power throughout...
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    Mazda 13b w/ Tracy Redrive

    Note that the one-bearing replacement is only rated for 6,000 to 6,500 RPM. Doesn't mean that it'll disintegrate if you run it above 6,500 RPM, but that its lifetime will drop. So if you routinely and consistently will be running above 6,500 RPM then check the bearing every 250 or so hours...
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