2 Min Tuesday: Constant Speed Propellers

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[iVince]

It depends on the prop manufacturer is correct answer.

[durwoodhibbard]

Holy cow a 2min Tuesday that was actually under two I'm not sure what I should do with my extra time now. LOL. As always great video, great info.

[MrAlwaysBlue]

That makes sense. I guess if you have a loss of oil pressure you would want prop to default to fine pitch?

[saratogapilot]

I thought for sure I knew the answer, for non-feathering props, but I appreciate it that you made this video to answer the question once and for all.

[landonwightman]

I love that turbocharged 195!!! Looking good....

[ThisIsLukes]

Not trying to disagree just wishing to open up the conversation but it somewhat depends on the aircraft no? I was under the impression that on some aircraft (perhaps larger?) That if you were to lose oil pressure the prop would go fine on its own whereas on others in the same situation it would go coarse.

[guasmonorte]

That was a great video! Please talk more about constant speed props!

[elgrigorio]

I love your videos, I learn so much from you

[tm]

Which way the blade pitch change mechanism works is very aircraft/ propellor/engine/mission dependent and there is no "one size fits all" answer as implied by this demonstration. For example, many propellors designed for aerobatic aircraft which suffer frequent, short duration loss of oil pressure will use positive oil pressure to drive to fine pitch in order to prevent the engine overspeeding during low-G manoeuvres.

[AeroNerd]

Hey Jon! I'm going to meet you one of these days! I've watched your CFI oral videos and many others and I'm about to take my CFI initial. If I pass, I owe you a case of beer man truly!! I fly in the KDAB, KFIN, KSGJ area. I don't know if you seen any videos on my channel yet, but if I do pass I will definitely give you a shout out on my next video!

[BoBjjjjs]

1 minute 34 seconds on a two minute Tuesday! We have been robbed!!! lol

[JoshuaJackson]

Is it just me or does that 195 look great. Some of the ladies might be checking out John but I'm checking out that 195😁😂

[andrewalexander]

This video is pretty badly flawed in that it gives the impression that there is one single answer, and that everything other than that is a myth. There is no "myth" to be busted here. The reality is that some props are driven toward low pitch by some combination of springs, gas pressure, and centrifugal twisting moment (CTM) and are moved toward high pitch by oil pressure. Other props are moved toward high pitch by Springs, gas pressure, and sometimes counterweights, and are moved toward *low* pitch by oil pressure. Still others (Many Hamilton-Standard models, for example) are moved both toward low pitch and toward high pitch by oil pressure. You video is a disservice to those viewers who might not have a sufficient base of knowledge to understand that you're making invalid generalizations.