Results 1 to 18 of 18

Thread: Climb or cruise prop?

  1. #1

    Join Date
    Jul 2019
    Location
    O’Fallon, MO
    Posts
    16
    Post Thanks / Like

    Climb or cruise prop?

    Can someone tell me if this prop, on pa18-160, is a climb or cruise prop, or something in between. Thanks.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	C51409CD-1F29-49F7-AAA3-0A5C2FD093CD.jpeg 
Views:	103 
Size:	160.2 KB 
ID:	44054  

  2. #2
    skywagon8a's Avatar
    Join Date
    Mar 2008
    Location
    SE Mass
    Posts
    9,267
    Post Thanks / Like
    That prop is for a Cherokee C. The S5 denotes that there is an integral spacer which pushes the prop 1-1/4" away from the crankshaft flange for cowl clearance on the PA-28-160 C. Since it is now a 56" pitch it would be a standard prop if on a stock PA-18-150 in between climb and cruise.
    This is Sensenich's prop application chart:
    http://www.sensenich.com/wp-content/...1349891787.pdf
    N1PA
    Thanks womblesd thanked for this post
    Likes ron, mike mcs repair, Brandsman liked this post

  3. #3
    PerryB's Avatar
    Join Date
    Aug 2007
    Location
    Northern Calif.
    Posts
    1,797
    Post Thanks / Like
    From a practical standpoint, I think that's leaning more towards the "cruise" end of the spectrum. Officially the cruise prop is 58", but that's a LOT of pitch for a 150 on a SC. For typical SC applications, I think you'd like it even better if it was a 54, but if I'm interpreting things correctly it started life as a 60, so it's already maxed out on re-pitching.
    After Monday and Tuesday, even the calendar says WTF !

  4. #4
    Steve Pierce's Avatar
    Join Date
    Mar 2002
    Location
    Graham, TX
    Posts
    18,633
    Post Thanks / Like
    Quote Originally Posted by PerryB View Post
    From a practical standpoint, I think that's leaning more towards the "cruise" end of the spectrum. Officially the cruise prop is 58", but that's a LOT of pitch for a 150 on a SC. For typical SC applications, I think you'd like it even better if it was a 54, but if I'm interpreting things correctly it started life as a 60, so it's already maxed out on re-pitching.
    Where does this come from? I have heard it for years but never had an issue getting a prop pitched to whatever I wanted.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers
    Likes mike mcs repair, Cattle cub liked this post

  5. #5
    PerryB's Avatar
    Join Date
    Aug 2007
    Location
    Northern Calif.
    Posts
    1,797
    Post Thanks / Like
    I always thought there was a limit of either 3 or 4 inches of allowable pitch movement in the life of a prop. I've never seen any documentation either, just heard it said more than once. Now I have a homework project.
    After Monday and Tuesday, even the calendar says WTF !

  6. #6

    Join Date
    Jan 2007
    Posts
    1,655
    Post Thanks / Like
    Thanks BC12D-4-85 thanked for this post

  7. #7
    PerryB's Avatar
    Join Date
    Aug 2007
    Location
    Northern Calif.
    Posts
    1,797
    Post Thanks / Like
    That's a lot more (8") than I expected. When I had my Borer (different mfg. I realize) bumped from 41 to 42, I'd swear the man at the prop shop said 3" was the cumulative limit. I'll have to call them back to get my memory refreshed.
    After Monday and Tuesday, even the calendar says WTF !

  8. #8

    Join Date
    May 2017
    Posts
    454
    Post Thanks / Like
    When I had my TriPacer, I had the 60” pitch prop repitched to either 53”, one inch less than the max allowed. Boy could that thing climb! Didn’t cruise very well though, but that’s what you want for banner towing.


    Sent from my iPhone using Tapatalk

  9. #9
    Steve Pierce's Avatar
    Join Date
    Mar 2002
    Location
    Graham, TX
    Posts
    18,633
    Post Thanks / Like
    Found some pictures of my last visit to the prop shop and the tool used to repitch.
    Click image for larger version. 

Name:	IMG_20180823_102638.jpg 
Views:	571 
Size:	92.3 KB 
ID:	44060

    Click image for larger version. 

Name:	IMG_20180823_102628.jpg 
Views:	569 
Size:	106.8 KB 
ID:	44061
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  10. #10
    Eddie Foy's Avatar
    Join Date
    Dec 2014
    Location
    South Florida
    Posts
    3,401
    Post Thanks / Like
    Where is the BFH?




    Quote Originally Posted by Steve Pierce View Post
    Found some pictures of my last visit to the prop shop and the tool used to repitch.
    Click image for larger version. 

Name:	IMG_20180823_102638.jpg 
Views:	571 
Size:	92.3 KB 
ID:	44060

    Click image for larger version. 

Name:	IMG_20180823_102628.jpg 
Views:	569 
Size:	106.8 KB 
ID:	44061
    "Put out my hand and touched the face of God!"
    Likes RaisedByWolves liked this post

  11. #11
    hotrod180's Avatar
    Join Date
    May 2008
    Location
    Port Townsend, WA
    Posts
    2,621
    Post Thanks / Like
    Don't go into the prop shop when they're repitching your prop!
    Just like don't go into the kitchen of your favorite restaurant.
    Cessna Skywagon-- accept no substitute!

  12. #12
    PerryB's Avatar
    Join Date
    Aug 2007
    Location
    Northern Calif.
    Posts
    1,797
    Post Thanks / Like
    I called American Propeller in Redding CA. this morning, and the tech said Sensenich has a limit of 8" cumulative (as Denny's info indicated) and McCauley has no stated limit.
    After Monday and Tuesday, even the calendar says WTF !

  13. #13

    Join Date
    Jan 2007
    Posts
    1,655
    Post Thanks / Like
    Back to the original question. In Alaska that prop would be called a "Ferry prop" to get your PA 18-160 back home so you can get your spare 82-43 Borer.
    DENNY

  14. #14
    skywagon8a's Avatar
    Join Date
    Mar 2008
    Location
    SE Mass
    Posts
    9,267
    Post Thanks / Like
    Quote Originally Posted by PerryB View Post
    I called American Propeller in Redding CA. this morning, and the tech said Sensenich has a limit of 8" cumulative (as Denny's info indicated) and McCauley has no stated limit.
    For what it's worth, I have heard that the reason for the two manufacturers having different re-pitching and repairing limits is because they use different alloys of aluminum. They seem to keep this alloy close to the vest as the following is the best I could do in researching the question.


    • High-strength, corrosion-resistant aluminum alloy
    • Today, aluminum propellers are often strengthened through the use of advanced aluminum alloys. For instance, the use of copper and zinc mixed with aluminum will alter its properties so that it may be both hardened and softened through the application of heat. Aluminum alloys may contain copper, manganese, magnesium, silicon, and/or chromium to increase strength and durability.
    N1PA
    Thanks PerryB thanked for this post

  15. #15
    hotrod180's Avatar
    Join Date
    May 2008
    Location
    Port Townsend, WA
    Posts
    2,621
    Post Thanks / Like
    Quote Originally Posted by skywagon8a View Post
    That prop is for a Cherokee C. The S5 denotes that there is an integral spacer which pushes the prop 1-1/4" away from the crankshaft flange for cowl clearance on the PA-28-160 C. Since it is now a 56" pitch it would be a standard prop if on a stock PA-18-150 in between climb and cruise.
    This is Sensenich's prop application chart:
    http://www.sensenich.com/wp-content/...1349891787.pdf
    FWIW that same prop is also used on at least some C150/150 conversions.
    Mine had a 52 pitch when I bought it, too flat.
    Borrowed a friends 58 pitch, too much prop,
    Took my 52 in for a repitch but had some paperwork issues with it, so I ended up buying a new one ordered at 56.
    It didn't want to turn up, so took it in for a repitch.
    Turns out my new "56" was more like 57 from the factory.
    I had them twist it down to about 54-1/2, which was a perfect compromise--
    good takeoff & climb, and good cruise too.
    My C150TD was a little cleaner (& heavier) than a SC, but I think a 54 or so would be a good all-around pitch for one of those too.
    Cessna Skywagon-- accept no substitute!

  16. #16
    skywagon8a's Avatar
    Join Date
    Mar 2008
    Location
    SE Mass
    Posts
    9,267
    Post Thanks / Like
    Quote Originally Posted by hotrod180 View Post
    FWIW that same prop is also used on at least some C150/150 conversions.
    With the spacer??
    N1PA

  17. #17
    hotrod180's Avatar
    Join Date
    May 2008
    Location
    Port Townsend, WA
    Posts
    2,621
    Post Thanks / Like
    Quote Originally Posted by skywagon8a View Post
    With the spacer??
    Yes, a 74DM6S5.
    I think the whole FWF package came off a Cherokee.
    An engine driven fuel pump (with electric backup) is part of the STC,
    mine even still had the cooling shroud & connected scat as per a Cherokee.
    Dunno why they stuck with the S5 prop, a standard spacer-less prop fit just fine with no clearance issues.
    Cessna Skywagon-- accept no substitute!
    Thanks skywagon8a thanked for this post

  18. #18
    Cubswede's Avatar
    Join Date
    Aug 2009
    Location
    Sweden
    Posts
    52
    Post Thanks / Like
    We modified our cub to 160 two years ago. The prop is a 56" sensenich. Before, when it was 150 hp it felt quite weak during takeoff, but after the mod to 160 in my opinion this pitch is spot on. We get 2500 static and 2600 on climbout. it "feels" strong and the cruise is really good for a super cub, just below 90 KT on wheels at 2400 RPM, and around 83 KTS on floats. We are really pleased with the 56". We tried a 53" also, but this pitch is too small. It jumps up on the step during takeoff on floats, but for a decent Cruise we need at least 2450 RPM.
    Thanks Steve Pierce thanked for this post

Similar Threads

  1. Cruise Prop vs. Climb Prop
    By j3jm in forum Cafe Supercub
    Replies: 7
    Last Post: 04-24-2019, 01:50 PM
  2. Cruise vs Climb Prop Takeoff Performance
    By scrappyf16 in forum Products, Purchases, Reviews & Prices
    Replies: 10
    Last Post: 06-08-2018, 09:55 AM
  3. Replies: 4
    Last Post: 03-31-2018, 08:52 AM
  4. Climb prop C-90
    By RaisedByWolves in forum Everything Else (formerly:My Other Plane Is A....)
    Replies: 63
    Last Post: 11-29-2016, 06:56 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
  •