Results 1 to 23 of 23

Thread: PA-11 C85-12 Prop recommendations

  1. #1

    Join Date
    Sep 2020
    Posts
    3
    Post Thanks / Like

    PA-11 C85-12 Prop recommendations

    Looking for recommendations on metal Prop combinations on a PA-11 C85-12, thanks in advance.
    Last edited by Navalav8tor; 01-02-2021 at 08:33 PM.

  2. #2
    cubdriver2's Avatar
    Join Date
    Apr 2003
    Location
    upstate NY
    Posts
    11,670
    Post Thanks / Like
    Welcome, climb? Cruise? Midrange? What are you trying to improve?

    Glenn
    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"

  3. #3
    cubman's Avatar
    Join Date
    Apr 2002
    Location
    BNW (Boone IOWA)
    Posts
    54
    Post Thanks / Like
    I have a McCauley CM7146 on my PA11/C-85. It is a cruise prop and I typically fly at pressure altitudes between 900-3000 feet. Static RPM is about 2500 - a little below redline. Hope this data point helps.

  4. #4
    supercrow's Avatar
    Join Date
    Dec 2008
    Location
    Smith Pond near Millinocket, Me
    Posts
    705
    Post Thanks / Like
    If your tach is accurate, you are doing a really good job with that prop.

  5. #5
    cubman's Avatar
    Join Date
    Apr 2002
    Location
    BNW (Boone IOWA)
    Posts
    54
    Post Thanks / Like
    I misspoke. Static RPM is ~2200. Full throttle is 2500.
    Thanks supercrow thanked for this post

  6. #6

    Join Date
    Sep 2020
    Posts
    3
    Post Thanks / Like
    Glenn, mostly climb. Hopefully that will allow me to continue to fly during our summer months in Texas...
    Thanks
    Last edited by Navalav8tor; 01-02-2021 at 10:21 PM.

  7. #7
    cubdriver2's Avatar
    Join Date
    Apr 2003
    Location
    upstate NY
    Posts
    11,670
    Post Thanks / Like
    Quote Originally Posted by Navalav8tor View Post
    Glenn, mostly climb. Hopefully that will allow me to continue to fly during our summer months in Texas...
    Thanks
    What prop are you flying now?

    Glenn
    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"

  8. #8

    Join Date
    Sep 2020
    Posts
    3
    Post Thanks / Like
    Glenn,
    Currently do not have one is why I'm soliciting the information, then I'll be faced with finding one...
    I bought the PA-11 as a project and am ready to assemble the engine and install the wings, then ready for a prop. Thanks

  9. #9

    Join Date
    Aug 2020
    Posts
    38
    Post Thanks / Like
    I’m a new owner of a PA-18-95 that has a C90-12 and came with two props. One is a Mac 71-46 cruise prop and the other is a Sen 76-2-42 climb prop. The Sen is new with only 100hrs. The Mac is fresh overhauled. I’m going to be flying a bit with both of them to decide which I prefer and then will likely part with one or the other. PM me or text me at 641-529-0420 if any interest.


  10. #10

    Join Date
    Feb 2006
    Location
    Maine
    Posts
    848
    Post Thanks / Like
    Are you stroking the engine? that will make a huge difference in your performance.
    Likes Hardtailjohn liked this post

  11. #11

    Join Date
    Sep 2002
    Posts
    1,026
    Post Thanks / Like
    Quote Originally Posted by Douten View Post
    Are you stroking the engine? that will make a huge difference in your performance.
    I do wipe the oil off occasionally, but..........
    Likes cubdriver2 liked this post

  12. #12

    Join Date
    May 2008
    Location
    Upper Peninsula of Michigan
    Posts
    878
    Post Thanks / Like
    C85 best climb prop in my experience (if stock) is Mac 71-42
    Thanks Navalav8tor thanked for this post
    Likes Hardtailjohn, 39-J3 liked this post

  13. #13
    Hardtailjohn's Avatar
    Join Date
    Jan 2007
    Location
    Marion, MT
    Posts
    950
    Post Thanks / Like
    I had 46 on my Tcraft and it was great for cruise, but I couldn't get off the ground with 2 people on skis, so had it repitched to 42 and it's awesome! Lost a few mph in cruise, but it was a whole different animal on takeoff.
    John
    Thanks Navalav8tor thanked for this post

  14. #14

    Join Date
    May 2015
    Posts
    17
    Post Thanks / Like
    Might be apples and oranges C85 to a stock O-200 but.

    I am in a PA11 with a O-200 and I have friends that let me try a couple of props so I tried 3 different McCauley props. Noting it's a cub so I not worried about cruse speed at this point just overall engine RPM's. Working from memory here is what I got, cruse is strait & level in a long downwind pattern except for the last one that I am sticking with for now.
    47 Pitch gave me about 1950 Static and 2300 Cruse, a little low for my liking at full throttle.
    44 Pitch gave me about 2050 Static and 2450 so in cruse again full throttle.
    42 Pitch (the one I am using now) gave is giving me 2350 Static, 2550 initially in clime out, then I have the throttle back to about 3/4 or less as soon as my airspeed passes about 70 or 80 indicated, at 2500 RPM I am settling in at about 90 Miles an hour indicated 6500' MSL, flying out of Broomfield CO. Just north of Denver, Field Elevation is about 5675 MSL. I like this one because it does give me more in the climb if I need it. I expect it would easily pass redline full throttle in any decent but haven't had the need to check that out yet.

    Dan M

  15. #15
    mvivion's Avatar
    Join Date
    Jun 2003
    Location
    Bozeman,MT
    Posts
    12,944
    Post Thanks / Like
    Quote Originally Posted by Andy Meyer View Post
    I’m a new owner of a PA-18-95 that has a C90-12 and came with two props. One is a Mac 71-46 cruise prop and the other is a Sen 76-2-42 climb prop. The Sen is new with only 100hrs. The Mac is fresh overhauled. I’m going to be flying a bit with both of them to decide which I prefer and then will likely part with one or the other. PM me or text me at 641-529-0420 if any interest.

    What basis are you going to use to install the 76 inch prop? Or are you experimental?

    MTV

  16. #16
    BC12D-4-85's Avatar
    Join Date
    Feb 2016
    Location
    Fairbanks, AK.
    Posts
    4,713
    Post Thanks / Like
    Hey Mike it's ok...Sen 76AK-2-** = 74" diameter. It's on Piper's 1A2 TCDS under Item 1(d) for C-90 engines. Also approved under TCDS 1P2 vibrationwise by Sen for the C-90 for 90 hp @ 2475 or less.

    Gary (-40F this morning so bored at the keys)

  17. #17
    cubdriver2's Avatar
    Join Date
    Apr 2003
    Location
    upstate NY
    Posts
    11,670
    Post Thanks / Like
    Quote Originally Posted by mvivion View Post
    What basis are you going to use to install the 76 inch prop? Or are you experimental?

    MTV
    -2 means it was cut 2" shorter after being factory made

    Glenn
    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"

  18. #18
    BC12D-4-85's Avatar
    Join Date
    Feb 2016
    Location
    Fairbanks, AK.
    Posts
    4,713
    Post Thanks / Like
    Sometimes 2" longer makes all the difference......I'm still looking for a 76AK-0-**

    Gary
    Likes Hardtailjohn liked this post

  19. #19
    mvivion's Avatar
    Join Date
    Jun 2003
    Location
    Bozeman,MT
    Posts
    12,944
    Post Thanks / Like
    Quote Originally Posted by cubdriver2 View Post
    -2 means it was cut 2" shorter after being factory made

    Glenn
    Yup, duh!

    MTV

  20. #20
    skywagon8a's Avatar
    Join Date
    Mar 2008
    Location
    SE Mass
    Posts
    13,237
    Post Thanks / Like
    Quote Originally Posted by cubdriver2 View Post
    -2 means it was cut 2" shorter after being factory made

    Glenn
    Almost, It was the factory which made it a 74. The 76 is the basic length of the design. The dash number is the amount the factory reduces the diameter from the basic design.
    NX1PA

  21. #21

    Join Date
    May 2008
    Location
    Upper Peninsula of Michigan
    Posts
    878
    Post Thanks / Like
    I once put a tape on my 76AK-2-40 prop on my C90 and it measured almost exactly 75” rounded tip to rounded tip. I also once swapped that prop onto my stock C-85-8 (removing the 71-42 mc ) it wouldn’t turn past 2100 rpm. Too much prop for a stock 85. It only had 200 hrs smoh so it wasn’t a tired motor. That 76AK IS “The” prop on the C90 though. Results may vary I guess, but the 71-42 was the sweet spot for my C-85
    Thanks BC12D-4-85 thanked for this post
    Likes Hardtailjohn liked this post

  22. #22

    Join Date
    Oct 2012
    Posts
    450
    Post Thanks / Like
    Dan, I had same experience with 76AK-2-42 Sensenich prop on C-85., but worked great on C-90.

    Andy, I don’t think you will find the -42 a climb prop on the c-90. -40 might be better for climb or at least that is what I experienced.
    Last edited by DavePA11; 02-11-2021 at 01:46 AM.

  23. #23

    Join Date
    Oct 2008
    Location
    Johannesburg, South Africa
    Posts
    115
    Post Thanks / Like
    I run the 76AK-2-42 on my J-3 which has an ex PA-18 C-90. The airfield I fly from is at 5440 amsl and it seems like the perfect prop although you have to be careful in any descent as it easily reaches red line


    Sent from my iPhone using SuperCub.Org
    'There can be no liberty unless there is economic liberty".
    Margaret Thatcher

Similar Threads

  1. C180 - PPONK -- Engine Mount and Prop Recommendations
    By CranelakeMN in forum Cafe Supercub
    Replies: 22
    Last Post: 02-09-2018, 09:12 AM
  2. Prop Shop Recommendations in/near Southern NY
    By Bluebear in forum Cafe Supercub
    Replies: 2
    Last Post: 02-13-2014, 11:55 AM

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •