Just browsing the COPA magazine, they briefly mention
“Ten- year propeller overhaul: we are looking toward new data to reintroduce the topic with Transport Canada”
I think in the states it’s time on prop limit.
What about the rest of the world ? Is Canada a special place that props go flying apart after 10 years ?
10 Year Prop Overhaul Canada
- Scudrunner
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5 out of 2 Pilots are Dyslexic.
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Of course not.
They fly apart at 10 years and one day. That is why the limit of 10 years.
The life limit was determined by TC after a gender inclusive, equal rights assessment that Canadians expect and deserve.
What! Didyou think they just arbitrarily pulled that 10 year limit from out of the air.?
They fly apart at 10 years and one day. That is why the limit of 10 years.
The life limit was determined by TC after a gender inclusive, equal rights assessment that Canadians expect and deserve.
What! Didyou think they just arbitrarily pulled that 10 year limit from out of the air.?
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Jokes on you guys: the Twin Beech’s Ham Stan props are 5 years, so I guess it’s 10 years per airplane.
Thankfully I wasn’t dumb enough to buy the Spruce Goose.
Thankfully I wasn’t dumb enough to buy the Spruce Goose.
Twin Beech restoration:
www.barelyaviated.com
www.barelyaviated.com
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What's the weakest spot on constant speed props? Let's say you keep running them indefinitely, what kind of failure mode is to be expected first?
Is it a matter of not holding RPM properly anymore, desintegration of the blade due to centrifugal forces, the whole thing exploding, something else ... ?
Is it a matter of not holding RPM properly anymore, desintegration of the blade due to centrifugal forces, the whole thing exploding, something else ... ?
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The few I have seen fail their inspections had too much filed off of them. Props run on gravel if improperly handled can take a lot of wear.
The details of my life are quite inconsequential...
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I have an avoid range of 1850-2000 RPM (I think, it’d have to check the POH) on the Beech. So there’s is harmonic resonance in there too.
*caution thread derail*
Even though you asked about constant speed, my Stinson’s MET-L prop had an avoid range as well (2100-2300 RPM if is can recall).
Ground resonance is a pretty big thing for helicopters too (depending on the make up of the hub). A pretty well known example is in the opening scene to a McGyver episode when they get dropped off on the roof of an LA skyscraper.
*caution thread derail*
Even though you asked about constant speed, my Stinson’s MET-L prop had an avoid range as well (2100-2300 RPM if is can recall).
Ground resonance is a pretty big thing for helicopters too (depending on the make up of the hub). A pretty well known example is in the opening scene to a McGyver episode when they get dropped off on the roof of an LA skyscraper.
Twin Beech restoration:
www.barelyaviated.com
www.barelyaviated.com
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Well the one failure mode that created an AD on steel hub Hartzell props , had to do with corrosion . The props might be 20 years plus since overhaul in the usa , and they shed the odd blade....
They improved the blade clamp design to hold them together.... very small corrosion pits will condem a blade to scrap...
They improved the blade clamp design to hold them together.... very small corrosion pits will condem a blade to scrap...
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Speaking of props:
Twin Beech restoration:
www.barelyaviated.com
www.barelyaviated.com
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