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  1. P

    newbie question re prop overspeed with constant speed prop

    Another question- Titan said the shaft the disintegrated bearing was on was damaged too, so the hardened surface of the shaft where it contacts the bearing was worn away. But instead of making a new shaft and having it hardened they somehow press fit the new bearing onto the shaft. Is that OK...
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    newbie question re prop overspeed with constant speed prop

    I'm thinking it would be best to install the new gearbox without the governor connected and ground run it until the initial fines are cleared. Then install the governor. Otherwise the governor and associated plumbing are going to get contaminated by the initial fines. Does that make sense?
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    newbie question re prop overspeed with constant speed prop

    I tried to say I was expressing my thoughts and was open to those thoughts being corrected. I guess I should have said it more often or more clearly. I'm not a pilot and will be hiring professional pilots to fly for me. Maybe if one is a CFI he can teach me to fly in it, but I think it unlikely...
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    newbie question re prop overspeed with constant speed prop

    OK, you guys have convinced me. I'll pull the gearbox, take it apart, and have a professional look at the innards. I can mount the new one, run it a bit, check the oil, and go from there. If it looks clean I'll mount the governor. The plumbing is very minimal and large bore, allowing...
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    newbie question re prop overspeed with constant speed prop

    Yes, the prop manufacturer states the degrees of overspeed and the steps that must be taken if those occur. The whole point of my removing the governor is to reduce the probability of overspeed to zero. Mine is not the only airplane that has experienced governor failure, and at least one of...
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    newbie question re prop overspeed with constant speed prop

    The gearbox was disassembled and the bad, cheap bearing replaced by Titan's professional aircraft mechanic.
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    newbie question re prop overspeed with constant speed prop

    My working hypothesis is that the gearbox MADE metal because an inferior quality bearing was used. That bearing has now been replaced, so it is no longer MAKING metal. And the governor WAS non-functional, but now has been cleaned up and removed, so it is moot. I don't really care about cruise...
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    newbie question re prop overspeed with constant speed prop

    As the plane flew from Ohio to California the fine pitch setting only generated 11" MAP at 1800 rpm. When viewed from the side the spinning prop was very thin indeed.
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    newbie question re prop overspeed with constant speed prop

    It is my plan to fly with different pitches to see what gives adequate takeoff and climb power and hopefully reasonable cruise speed. The pilot with the prop set as I describe (static 1800-2000 rpm and 14-16"MAP) sees 2500-3000 fpm climb, but I don't know what cruise speed that would give
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    newbie question re prop overspeed with constant speed prop

    This is a GM LS3 430 hp V8 and an Autoflight gearbox made in New Zealand. The governor shares oil with this and not the engine.
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    newbie question re prop overspeed with constant speed prop

    This is a continuation of this thread: https://www.homebuiltairplanes.com/forums/threads/reflections-on-the-2nd-anniversary-of-my-ownership-of-a-t-51.33910/ I had previously been told the metal debris in the gearbox was generated by the idler shaft bearing being installed 15 thou off center...
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    newbie question re prop overspeed with constant speed prop

    Several people have tried to figure out a way to eliminate the metal dust, and it seems there is no way to. There is no oil pump except at the base of the governor, so no way to have a proper filter The fines causing the problem are the very fine dust. The screen was clean despite the governor...
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    newbie question re prop overspeed with constant speed prop

    The governor on my Titan T-51 seems to be a definite weak point, probably because it shares oil with the gearbox and gets gummed up with metal dust. Anyway, my tentative solution is to treat it like a ground adjustable prop and set the pitch at a midpoint pitch. My question is whether my...
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    Insurance?

    One thing I have noticed is that I am not aware of a single accident that resulted in a fire. Probably much more survivable if you are knocked out, recover consciousness, and climb out than if you burn while you're unconscious.
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    Insurance?

    This is my main concern. No liability insurance, no airport use. I could eat the hull loss.
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    another Autoflight gearbox failure - this time after 34 hrs

    UPDATE-- It turns out the machinist / mechanic who said the bearing was installed 15 thou off axis actually has never even opened the gearbox and looked inside. He's had it for 6 months now. I gather it's common in Aviation to have mechanics do this kind of thing, but I find it astounding. I...
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    PSRU rating adjustment for RPM?

    The new gearbox is designed to take up to 600hp and is "considerably heavier". So far only one has been produced and that plane has not flown yet. So truly "experimental."
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    PSRU rating adjustment for RPM?

    The LS3 430 makes 300hp at 4000 rpm. While you could spin the engine to 4750 without overspeeding the prop with the 1.9 gearbox, at WOT you'd have about 380hp. (Cruise is 12" MAP at 3000 rpm for 180 mph IAS at low altitude.)
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    PSRU rating adjustment for RPM?

    Would it be excess hp or torque that would lead to the gearbox failing unexpectedly, that is, the temperature is fine but the housing, a gear, or a shaft suddenly fails when the throttle is opened on takeoff? According to GM, at 4000 rpm the LS3 430 is putting out 300 hp, the max for the box...
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    PSRU rating adjustment for RPM?

    The Autoflight "small V8, 1.9 ratio" PSRU as used on most Titan T-51s powered by LS3s is rated at 300hp at 6000 rpm. What is it rated at at 4500 rpm? Is it a linear relationship, so 240hp? I gather it is the strength of each pulse that matters, so you have to adjust the rating downward for...
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