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Doug Riley
Doug Riley
Platinum Member
Last Activity: 10-11-2018, 07:52 AM
Joined: 01-11-2004
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  • I don't see a problem with the shallow bends under discussion, in non-heat-treated metal such as 4130 N, 1018-1020, etc. The hardened stuff is apt to to crack.

    Dominator landing gears (welded 4130 tubing) are "fine tuned" for toe and camber with a torch on assembly....
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  • Doug Riley
    replied to Extracting Ethanol
    Bill, your analysis arguing against the "fuel-tank-as-dehumidifier" theory (and the jar experiment) are convincing.

    My experience, however is that, for whatever reason, considerable water used to accumulate in the 15-gallon fuel system of my Dominator over a Vermont winter. ...
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  • Doug Riley
    replied to McCutchen Teeter Block Setup
    Everything Jake has said matches my experience with my Air Command.

    Look for out-of-track by flying and watching the tips out at 10 o'clock/2 o'clock. (Don't do this in traffic.) Hold the stick still. Once I spotted an out-of-track condition, I'd detect the high blade on the ground...
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  • Doug Riley
    replied to Hang Test
    The hang-test procedure serves two purposes. The first, as Jake said, is to center the controls at cruise. The second is to allow the fuselage to ride at its designed stance (neither nose-up nor nose-down) at cruise.

    The second goal is deeply affected by prop thrustline position relative...
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  • A bit of a footnote:

    I started AEROTEC, Inc. here in VT in 1988.

    Why (I already had a job...)?

    I'd found it ridiculously hard to source clean, certified and unscratched 1x2 x 0.125 6061-T6 "redundant mast" tubing. I was unwilling to fly my newly-purchased...
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    Last edited by Doug Riley; 09-26-2018, 08:10 AM. Reason: Disambiguated Doc Watson and Doc Severenson

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  • Doug Riley
    replied to Rotor blade flexing video
    It's true! It makes you wonder why we don't see more aluminum blade spars failing in fatigue. Aluminum has pretty poor fatigue resistance. Many extruded spars are just plain old commercial 6061-T6 -- not even the most fatigue-resistant member of the aluminum-alloy family.

    But it's hard...
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  • Brian: Sounds like you want to know what the "doomsday" situation looks like. What happens if your RRPM goes too low in flight?

    Well, I'm still here, so the simple answer is I don't know. We can predict with some confidence, based on what many, many observers have seen in...
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