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Thread: Borer prop benefits pros/cons

  1. #41
    skywagon8a's Avatar
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    Quote Originally Posted by OLDCROWE View Post
    I understand that point and wouldn't disagree.

    I just would like an honest/direct answer because in person across a picnic table at the 2013 New Holstein Pig Roast, Craig told me they were working on it and it was two, maybe three years away.

    The good news in now there are several certified alternates really in the works.
    Perhaps since 2013 he changed his mind? In my reading of the certification requirements, it certainly doesn't appear to be very difficult to accomplish. Particularly for a wood core prop. Maybe he had a chat with his insurance agent?
    N1PA

  2. #42

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    Quote Originally Posted by skywagon8a View Post
    Perhaps since 2013 he changed his mind? In my reading of the certification requirements, it certainly doesn't appear to be very difficult to accomplish. Particularly for a wood core prop. Maybe he had a chat with his insurance agent?
    I should have noted that since then I and others have called and stopped in their booth at OSH but I gave up 3 years ago.
    Remember, These are the Good old Days!
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  3. #43
    Steve Pierce's Avatar
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    I spoke with them recently. They put it on hold to do a big project for Boeing and one for NASA I believe. I can guarantee those paid better and created more of a fun challenge than certifying a prop with the FAA.
    Steve Pierce

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  4. #44
    hotrod180's Avatar
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    Quote Originally Posted by skywagon8a View Post
    Perhaps since 2013 he changed his mind? In my reading of the certification requirements, it certainly doesn't appear to be very difficult to accomplish. Particularly for a wood core prop. Maybe he had a chat with his insurance agent?
    Getting anything accomplished with the FAA is difficult-- just ask Boeing re 737 Max.
    Try doing something simple like just getting a replacement airworthiness certificate sometime from a less-than-helpful FSDO rep,
    maybe it'll give you a different perspective.
    Somebody I know watched Bushwheel Bill's video about the QMI hockey-stick-repair kit,
    "wow, three thousand bucks seems like a lot".
    Considering the horror stories I've heard from people trying to get an STC or any other kind of FAA multiple-airplane approval,
    or even just a one-time field approval, $3K sounds very reasonable.
    Last edited by hotrod180; 02-12-2020 at 11:40 AM.
    Cessna Skywagon-- accept no substitute!
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  5. #45
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    Quote Originally Posted by hotrod180 View Post
    Getting anything accomplished with the FAA is difficult-- just ask Boeing re 737 Max.
    Try doing something simple like just getting a replacement airworthiness certificate sometime from a less-than-helpful FSDO rep,
    maybe it'll give you a different perspective.
    Somebody I know watched Bushwheel Bill's video about the QMI hockey-stick-repair kit,
    "wow, two thousand bucks seems like a lot".
    Considering the horror stories I've heard from people trying to get an STC or any other kind of FAA multiple-airplane approval,
    or even just a one-time field approval, $2K sounds very reasonable.
    I haven't done one but i'd imagine it would be labor intensive to replace the stringer. 2 guys needed to rivet, then touch up paint work on the fuselage, vs bills it seems like a one man job
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  6. #46
    Penguin's Avatar
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    Has anyone purchased a Borer in the last year or so? If so, can you verify the paint pattern of a factory new one? 2x 2" stripes? Or the fat stripe with the 1/2" below it. Mccauley doesn't seem concerned with my queries.

  7. #47
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    About a year oldClick image for larger version. 

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  8. #48

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    Catto would know. They paint a few with that same scheme.
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  9. #49
    Binty's Avatar
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    Anyone running a 84/43 Borer ?? on a 150?? Whats it like? Is this too much. Whats involved in cutting down to 82.
    If you force it, it will fit

  10. #50
    skywagon8a's Avatar
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    An old rough rule of thumb: adding one inch of pitch is equivalent to subtracting one inch of diameter and vice versa. So, cutting an 84/43 to 82 without changing the pitch should give roughly the same performance as an 82/45. Sounds like an intermediate to cruise prop to me.

    For an example I've used an 80/46 with good performance results. Using the above rule of thumb with your 84/43 cutting to an 80 would give you an 80/47 equivalent.

    Cutting is basically a hacksaw, file smooth and balance.
    N1PA

  11. #51
    PerryB's Avatar
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    That's going to be too much prop for a 150. For a standard/stock 150 hp O-320 an 82/42 is about all it wants to swing.
    After Monday and Tuesday, even the calendar says WTF !
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  12. #52

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    Quote Originally Posted by Binty View Post
    Anyone running a 84/43 Borer ?? on a 150?? Whats it like? Is this too much. Whats involved in cutting down to 82.
    Is there an 84” McCauley that bolts on a -320?
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  13. #53

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    I run an 82x 43 on a 160hp, runs good likely only loose a few RPM in climb and won't over-rev as quick ( one learns to pull it back as you're leveling off). I've heard rumor they can be cut down below 82 in a pinch, call a prop shop for 84" cut down options.

    What else ya need?
    Remember, These are the Good old Days!

  14. #54
    skywagon8a's Avatar
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    Quote Originally Posted by KevinJ View Post
    Is there an 84” McCauley that bolts on a -320?
    The 1A175GM which is the "Borer" prop, is approved by the Type Certificate P-857 on the 0-320 series up to 160 hp at a diameter of 78"-82".

    Why would you want more than 82"? That does a good job.
    N1PA

  15. #55

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    Borer prop benefits pros/cons

    i run a 82/41 on my 150 hp 18. Its static is 2425 and climbs at 2550
    It will exceed reline (2700) flat out at 3000 msl
    Seems perfect for my wants. Pitch is prop shop verified


    Sent from my iPhone using SuperCub.Org

  16. #56

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    Quote Originally Posted by skywagon8a View Post
    The 1A175GM which is the "Borer" prop, is approved by the Type Certificate P-857 on the 0-320 series up to 160 hp at a diameter of 78"-82".

    Why would you want more than 82"? That does a good job.
    Pete,
    I think you misinterpreted my question. I’ve never heard of an 84” Borer and was making sure it was a typo and not something I’ve missed. I’ve heard guys talk about Pawnee props on cubs but not an 84” Borer.

    That said, I’ll take an 84” Catto over an 82” if my mission is stump pulling. This is an apples to oranges argument when comparing Cattos to McCauleys so I won’t waste much time. If there was an 84” Borer you can bet I’d try it if it didn’t cost as much as gold and weigh more!

  17. #57
    Steve Pierce's Avatar
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    My 150 hp 320 swung an 8243 just fine.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers
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  18. #58
    skywagon8a's Avatar
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    Quote Originally Posted by KevinJ View Post
    I’ve heard guys talk about Pawnee props on cubs but not an 84” Borer.
    Kevin, I've heard this talk too. They may use what they wish, I tend to look at the type certificate and found some diameter vibration limitations with that prop which suggest it is not a good idea. Perhaps it is just a matter of what official testing was done?
    N1PA

  19. #59

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    Quote Originally Posted by J3Jim View Post
    Hey guys,

    I need an education on borer props and the benefits on a Pa-18-150. Is there a big ROC increase? What are measurable performance benefits?
    I know nothing about them. I’m also curious as to the prop clearance issues as i understand owners will add gear leg extensions or larger tires for prop clearance. And is it all worth it for a grass strip flyer!
    Thank you I appreciate it!
    Looks to me like it was worth it. Ought to be able do all those mods for less than $15k too.
    Catch the fish, to make the money, to buy the bread, to gather the strength, to catch the fish...
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