Where (engine, stage) do these HPC blades come from?
Posted by arizonadeux@reddit | aviation | View on Reddit | 10 comments
I bought these on eBay, allegedly they were a part of a Lufthansa limited edition gift collection some 20 years ago.
Features of earring blade "BD":
- "BD" printed on the inside of the endwall
- "P1" followed by 3-4 missing characters, then "18" printed on one side of the dovetail
- "CG", 3-4 missing characters, then "66" on the other side of the dovetail
- a dark etching 5 mm wide at the blade tip
Features of earring blade "M":
- "M" or possibly Greek "Σ" printed on one side of the inside of the endwall
- "10" or possibly "16" printed on the other side of the inside of the endwall
- "P1", 3-4 missing characters, then "19" printed on one side of the dovetail
- a dark etching 20 mm wide, starting from the blade tip
Features of necklace blade "07":
- "07" or possibly "27" or "97" printed on the inside of the endwall
- a notch, possibly for a locking feature on the suction side of the endwall, 6 mm wide and 2.5 mm deep
Here are some dimensions: - blade mass: 11 g - blade height: 22 mm - blade chord length: 20 mm - blade axial length: 16 mm - 50% chord blade thickness at tip: 1 mm - blade circumferential length: 17 mm - length, base of dovetail to blade inner diameter: 7 mm
Droidy934@reddit
Short blades are close to the combustion chamber I was going to say stage 8, not surprised it's stage 9.
OuchBag@reddit
Sir, that's jewelry.
Fickle_Force_5457@reddit
Rough guess would be a CFM56, Stage 9. One is a locking blade, it's the one with the square notch out of the platform to allow the lock to be tightened.
arizonadeux@reddit (OP)
Yeah, I feel like I got lucky with the locking blade.
How can you tell it's from Stage 9?
Fickle_Force_5457@reddit
It's purely by the size of the blade. They look as if they've been rejected at inspection. The locking blade has a mirror version if memory is okay.
OriginalGoat1@reddit
Is the necklace one the same size or bigger as the earrings ? The earrings with P1xxx part numbers are CFM HPC blades. Probably stage 9
arizonadeux@reddit (OP)
They're all the same size.
Thanks for confirming that they're from a CFM56!
Silkdrum@reddit
BD could be the forging symbol - this could tell you where the parts were forged. I don’t know what BD is though.
Guadalajara3@reddit
Kinda looks like it's off a GE or PW. The part number would be right where the chain connects. Pratt numbers are i think numbers, letter then 5 numbers and GE numbers are 4 numbers, a letter, 2 digits, a letter and 2 digits
Looks like a late stage HPT compressor blade but I can't find any good reference pics online to see what stage
arizonadeux@reddit (OP)
I bought these on eBay, allegedly they were a part of a Lufthansa limited edition gift collection some 20 years ago.
Features of earring blade "BD":
- "BD" printed on the inside of the endwall
- "P1" followed by 3-4 missing characters, then "18" printed on one side of the dovetail
- "CG", 3-4 missing characters, then "66" on the other side of the dovetail
- a dark etching 5 mm wide at the blade tip
Features of earring blade "M":
- "M" or possibly Greek "Σ" printed on one side of the inside of the endwall
- "10" or possibly "16" printed on the other side of the inside of the endwall
- "P1", 3-4 missing characters, then "19" printed on one side of the dovetail
- a dark etching 20 mm wide, starting from the blade tip
Features of necklace blade "07":
- "07" or possibly "27" or "97" printed on the inside of the endwall
- a notch, possibly for a locking feature on the suction side of the endwall, 6 mm wide and 2.5 mm deep
Here are some dimensions: - blade mass: 11 g - blade height: 22 mm - blade chord length: 20 mm - blade axial length: 16 mm - 50% chord blade thickness at tip: 1 mm - blade circumferential length: 17 mm - length, base of dovetail to blade inner diameter: 7 mm
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