Hamilton Standard 12D40 6101-12 blade limits?

[snj-5]

Anyone have blade measurement limits (station, thickness & profile) handy for a T-6 prop (12D40 6101-12)?

There's a couple of blades for sale locally and I'd like to measure them to determine if they are inexpensive
mailbox stands or if they are potentially serviceable blades that can be overhauled.

Thanks,

Bela P. Havasreti

[bdk]

Sta 12 = 4.840w 3.398t
Sta 18 = 6.150w 1.829t
Sta 24 = 7.510w 1.095t
Sta 30 = 8.120w 0.790t
Sta 36 = 7.840w 0.632t
Sta 42 = 7.030w 0.498t
Sta 48 = 5.720w 0.356t

[51fixer]

Sta 12 = 4.840w 3.398t
Sta 18 = 6.150w 1.829t
Sta 24 = 7.510w 1.095t
Sta 30 = 8.120w 0.790t
Sta 36 = 7.840w 0.632t
Sta 42 = 7.030w 0.498t
Sta 48 = 5.720w 0.356t

Blade stations are computed based on a complete assembled prop.
The blades need the tapered bore bushing attached otherwise you need to .250 to the blade.
I have forgotten the distance that separates the base of the blades on the spider. IIRC it is a little over 9" from the blade base that the 12" station is marked.
I will see if I have the datat when I get to work.

[snj-5]

Thanks Rich! I had wondered what datum point the measurements were taken from
after viewing bdk's scan.

Bela P. Havasreti

[51fixer]

Sta 12 = 4.840w 3.398t
Sta 18 = 6.150w 1.829t
Sta 24 = 7.510w 1.095t
Sta 30 = 8.120w 0.790t
Sta 36 = 7.840w 0.632t
Sta 42 = 7.030w 0.498t
Sta 48 = 5.720w 0.356t

Blade stations are computed based on a complete assembled prop.
The blades need the tapered bore bushing attached otherwise you need to .250 to the blade.
I have forgotten the distance that separates the base of the blades on the spider. IIRC it is a little over 9" from the blade base that the 12" station is marked.
I will see if I have the data when I get to work.

From my 1983 Blade Overhaul Book-

6101A D 56151 AMS4130 10'0"

The basic design of the 6101A Blade is a 10 foot dia prop when assembled. The designation of 6101A-12 means it is a 12" reduction from the 10' base dia or 6" from each blade. A -18 is 9" from each blade or 3" shorter than what is used on the T-6.
Further reductions are allowed up to an authorized amount.

From-
TABLE 411
DISTANCE FROM BUTT FACE TO 12-INCH STATION

SIZE (INCHES) THICKNESS (INCH) (INCHES)
SHANK(1) 12" STA(2) Flange(3) No Flange(4)
B 10. 00 No flange --
D 9.56 0.250 9.81
E 9.19 0.312 9.50
H (6959A) 9.19 0.312 9. 50
H (7121A) 8. 948 0. 430 9. 38

(1)BLADE SHANK SIZE- (Type of blade, for a T-6 it is D)
(2)DISTANCE FROM BUTT FACE TO 12-INCH STATION
(3)BUSHING FLANGE THICKNESS (T-6 is .250)
(4)BUSHING FLANGE FACE TO 12" STATION (Adding Bushing Flange Thickness onto the Bare Blade Dimension, T-6 is .250)

[snj-5]

Fantastic, thanks again Rich and bdk!

Bela P Havasreti

[51fixer]

Sta 12 = 4.840w 3.398t
Sta 18 = 6.150w 1.829t
Sta 24 = 7.510w 1.095t
Sta 30 = 8.120w 0.790t
Sta 36 = 7.840w 0.632t
Sta 42 = 7.030w 0.498t
Sta 48 = 5.720w 0.356t

Blade stations are computed based on a complete assembled prop.
The blades need the tapered bore bushing attached otherwise you need to .250 to the blade.
I have forgotten the distance that separates the base of the blades on the spider. IIRC it is a little over 9" from the blade base that the 12" station is marked.
I will see if I have the data when I get to work.

From my 1983 Blade Overhaul Book-

6101A D 56151 AMS4130 10'0"

The basic design of the 6101A Blade is a 10 foot dia prop when assembled. The designation of 6101A-12 means it is a 12" reduction from the 10' base dia or 6" from each blade. A -18 is 9" from each blade or 3" shorter than what is used on the T-6.
Further reductions are allowed up to an authorized amount.

From-
TABLE 411
DISTANCE FROM BUTT FACE TO 12-INCH STATION

SIZE (INCHES) THICKNESS (INCH) (INCHES)
SHANK(1) 12" STA(2) Flange(3) No Flange(4)
B 10. 00 No flange --
D 9.56 0.250 9.81
E 9.19 0.312 9.50
H (6959A) 9.19 0.312 9. 50
H (7121A) 8. 948 0. 430 9. 38

(1)BLADE SHANK SIZE- (Type of blade, for a T-6 it is D)
(2)DISTANCE FROM BUTT FACE TO 12-INCH STATION
(3)BUSHING FLANGE THICKNESS (T-6 is .250)
(4)BUSHING FLANGE FACE TO 12" STATION (Adding Bushing Flange Thickness onto the Bare Blade Dimension, T-6 is .250)

I added spaces and aligned columns in laying out my post but the electrons shrink the space between words.
SHANK(1) is D
12" STA(2) @ 9.56
Flange(3) is 0.250
No Flange(4) @ 9.81

[snj-5]

Thanks again guys for the information + help. Brought those blades home yesterday (its
always great to find parts right in your "back yard"). One of the blades is no good, but
the other one appears to be dimensionally acceptable. My favorite prop shop will no
doubt give me the real scoop on whether or not it will ultimately pass muster....

Bela P. Havasreti

[Enemy Ace]

Be very careful if you are using Atlanta Propellor, Since Sam Parker died the parts they find "unserviceable" has gone through the roof, especially blades AFTER they grind the pizz out of them with something that looks like it was originally designed to take barnacles off of ships.
I no longer send in props unless I have stripped the paint off myself. There is no good reason to remove so much material grinding/sanding prior to inspection.

[C.6-60]

Hello Bela,
This is a great thread you started here.
The WIX faithful are really a wealth of information.
One last measurement that I think would be handy for weeding out blades that you may stumble upon is:
The distance from butt face to tip for an individual blade that would make up a full length (9 feet or 108 inches, dash 12) 6101A-12 prop in a 12D40 hub.
I've never had the opportunity to split a hub and measure an individual full length T-6 prop blade.
If anyone has this info handy I would really appreciate it.
Thanks,
Vincent

[51fixer]

Hello Bela,
This is a great thread you started here.
The WIX faithful are really a wealth of information.
One last measurement that I think would be handy for weeding out blades that you may stumble upon is:
The distance from butt face to tip for an individual blade that would make up a full length (9 feet or 108 inches, dash 12) 6101A-12 prop in a 12D40 hub.
I've never had the opportunity to split a hub and measure an individual full length T-6 prop blade.
If anyone has this info handy I would really appreciate it.
Thanks,
Vincent

Info from the 12" station is given above and is used to determine this.
If you have the blade out of the hub and it is sitting there with the Taper bore flange on you have to use the published blade stations to measure.
Blade stations and O/A dia are based on a complete and assembled prop.

12" STA(2) @ 9.56 means the 12" sta is measured at 9.56" up the blade if it have the tapered bushing flange still installed. The flange is .250 thick.

No Flange(4) @ 9.81 means the 12" sta is 9.81" from the bottom of the blade.

Using this book info allows you to figure the blade length for an individual blade-
Book prop dia new and min allowable sizes divided by 2 gives you the center of the prop hub to the tip. Lets call this A1 for new length and A2 for min allowable
Whether the flange is installed or not use the above info where you subtract 9.56 or 9.81 from 12. Lets call this B1 Flange and B2 no Flange
B1 is 2.19"
B2 is 2.44"

FAA TCDS gives the following-

1. Propeller - Hamilton Standard, constant speed hub 12D40, 175 lbs. (-57)
blades 6101-12 to -14, incl.
Dia.: Max. 9'1", Min. allowable for repairs 8'10-5/8".
No further reduction permitted.

Max dia of 109"/2= 54.5" is A1
Min Allowable is 106.625/2= 53.3125 or 53 5/16" is A2


Doing some math-

Length of a bare blade (with the Flange) is-
New or Max dia each blade is 52.31" or 52 5/16"
Min blade length is 51.12 or 51 1/8".

If the Taper Bore Flange is removed-
New is 52.06 or 52 1/16
Min is 50.87 or 50 7/8

Length is just one measurement as width and thickness at each station are important as well.

Please do your own math to double check.

[C.6-60]

Thank you very much Rich!!
I've got it now.
You have been a wealth of information.
Vincent

[pilot06]

Thanks guys for the great resource.

PC

[Speeddemon651]

Are 6101A-12 blades interchangeable between the 12D40 and 2D30 hubs ?

[EW439]

Yes they are.