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Thread: Sensenich Ground Adjustable Prop

  1. #201
    Steve Pierce's Avatar
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    Quote Originally Posted by SJ View Post
    Those are some little tiny tires!

    sj
    They make it challenging with a cross wind, shimmying Baby Bushwheel tailwheel 250 lb passenger at gross weight. No shimmy today with the 3200 and the landings were a piece of cake but you better not drop it in cause it'll jar your teeth. Add in the comments from the back seat FAA test pilot when the landing isn't so smooth.
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    Steve Pierce

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  2. #202
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    Quote Originally Posted by KevinJ View Post
    Starter button!? The cub gods are trying to send you a message. You donít need the button or the starter attached. What you need is a good shoulder surgeon
    Keeping my starter and foregoing the shoulder surgery at this point. I'll leave that hand propping to you young bucks.
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  3. #203
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    Quote Originally Posted by Steve Pierce View Post
    Add in the comments from the back seat FAA test pilot when the landing isn't so smooth.
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    I think you can probably throw a comment or two back
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  4. #204
    Steve Pierce's Avatar
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    LOL, he has been good, I have gotten some interesting sounds when I pull the stick all the way back in the flare.
    Steve Pierce

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  5. #205
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    Quote Originally Posted by RaisedByWolves View Post
    Iíve had a few people try and order some for exp, sensnich must be really busy already. They never got back to them.


    Sent from my iPhone using Tapatalk
    I have had my 82Ē GA prop for several months, but then I figured once the certification happened (long over due obviously) they would be hard to get. Hence I ordered mine a LONG time ago.

    I like having things in hand even well before I need them.
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  6. #206
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    Steve why is your gear splayed soooo far OUT??? Can't imagine how far that must tilt those tires when your at GW??? Is that being caused by the shocks not having correct tensions; to hold the weight of the plane?? Not being critical here, just an honest question?
    The new Cub looks great.
    E
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  7. #207
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    Earle, it will be interesting to get Steve's take on this but I think you will find it works best for the type of off airport landings he is making down his way. The developers of the shock systems we are seeing the last few years refer to the travel limits of there systems as compression and sag. Most recommend exactly what you are referring to as preferable because it increases the overall distance the unit is allowed to travel which simply means more usable shock absorbtion in particularly rough ground. And I suspect the slight splay out might also increase stability at touch ground on very rough areas? Interested to hear the take others have on this. The monster shock system I use talks about setting them up to allow that extra movement. I prefer a more level stance for mine, but i am not generally using like Steve does down along the river.

  8. #208
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    Quote Originally Posted by TurboBeaver View Post
    Steve why is your gear splayed soooo far OUT??? Can't imagine how far that must tilt those tires when your at GW??? Is that being caused by the shocks not having correct tensions; to hold the weight of the plane?? Not being critical here, just an honest question?
    The new Cub looks great.
    E
    Spinning it around and it wasn't bottomed out.
    Steve Pierce

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  9. #209

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    Quote Originally Posted by SJ View Post
    Those are some little tiny tires!

    sj
    Somewhere in Graham Texas there's a BBQ Grill up on blocks...
    Remember, These are the Good old Days!
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  10. #210
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    Quote Originally Posted by TurboBeaver View Post
    Steve why is your gear splayed soooo far OUT??? Can't imagine how far that must tilt those tires when your at GW??? Is that being caused by the shocks not having correct tensions; to hold the weight of the plane?? Not being critical here, just an honest question?
    The new Cub looks great.
    E
    This is just pushing it straight back, Burl's AOSS.
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    Steve Pierce

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  11. #211

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    Yes, but what's with the tiny tires on "Double-Oh-Six" in the back corner ? The Sensenich prop should work great on a Scout.

    Thanks. cubscout

  12. #212
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    Gotcha

  13. #213
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    Concluded the landing test yesterday with 6 landing starting at dawn. Will schedule the noise testing in a few weeks and we are hoping to use my airplane since I have approval for the prop and would save switching the airworthiness certificate from standard to experimental which involves a DAR coming from Waco twice to do. I will have to take off and climb over the microphone at a certain altitude. This is the last step and hopefully the data will get processed and submitted and an STC granted soon.
    This is the test airplane with the ground adjustable prop.
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    Flight test briefing with the FAA and Sensenich. Alley was the supervisor.
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    The crew. I learned a lot about props from Jon Bristol and Steve Boser at Sensenich and a lot about test flying procedures from Tom Bryant. Bob Brock kept all the i's dotted and t's crossed.
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    Steve Pierce

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  14. #214
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    Debating on which prop to put on my project. So once this prop becomes certified how long before they’re available?

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    A friend of mine has a PA 12 with an O320 on the front and is looking for a prop. When this prop is certified for O 320 will it only be for the PA18 or will the certification include other piper taildraggers with similar type certification PA11-PA12-PA18?

  16. #216
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    Quote Originally Posted by Steve Pierce View Post
    Concluded the landing test yesterday with 6 landing starting at dawn. Will schedule the noise testing in a few weeks and we are hoping to use my airplane since I have approval for the prop and would save switching the airworthiness certificate from standard to experimental which involves a DAR coming from Waco twice to do. I will have to take off and climb over the microphone at a certain altitude. This is the last step and hopefully the data will get processed and submitted and an STC granted soon.
    Just curious, but why wouldn't the noise test be conducted in the same configuration (same aircraft) as the other performance testing?

  17. #217
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    Quote Originally Posted by Supercubrancher View Post
    A friend of mine has a PA 12 with an O320 on the front and is looking for a prop. When this prop is certified for O 320 will it only be for the PA18 or will the certification include other piper taildraggers with similar type certification PA11-PA12-PA18?
    The STC will be for the PA18 with an O-320 engine installed both 150 and 160 hp. The prop is type certified on the O-320 and O-360 engines and that data along with the STC data for the PA18 can be used to get a field approval or DER approval of the prop on other aircraft. It has gotten approval via that route on a 180 hp C172 converted to tail wheel and on a Pacer. I was considering pursuing an STC for the Pacer but having seen what this project took I don't think I have the time, patience or money to do it.
    Steve Pierce

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  18. #218
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    Quote Originally Posted by frequent_flyer View Post
    Just curious, but why wouldn't the noise test be conducted in the same configuration (same aircraft) as the other performance testing?
    The performance data has to be interpolated to come up with the altitude at which the altitude the airplane has to climb over the microphone on take-off. The aircraft would again have to be put into the Experimental category and then back to standard which takes a DAR two trips, expense etc. If I use my airplane which has approval to run the prop it can be one trip to prove compliance.
    Steve Pierce

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  19. #219
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    Quote Originally Posted by Steve Pierce View Post
    The performance data has to be interpolated to come up with the altitude at which the altitude the airplane has to climb over the microphone on take-off. The aircraft would again have to be put into the Experimental category and then back to standard which takes a DAR two trips, expense etc. If I use my airplane which has approval to run the prop it can be one trip to prove compliance.
    Ok, thanks. I was assuming the test aircraft would be dedicated to the program and stay experimental until the program was completed.

  20. #220

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    Problem if you leave the airplane in Experimental R&D/Show Compliance is based on 91.319, it can ONLY be used for the purpose for which it is Certificated. If it stays Experimental, it can only be used for the testing and nothing else.


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  21. #221
    Steve Pierce's Avatar
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    That is why it was returned to standard and to it's owner. We never know how long these things are going to take.
    Steve Pierce

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  22. #222
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    (deleted post about unrelated cert programs)
    Last edited by frequent_flyer; 10-02-2022 at 07:45 AM.

  23. #223

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    Hey Steve:

    Do you have any experience with the 3 blade 78Ē STOL prop? I debating whether to get that or the 82Ē two blade. Itís for a Carbon Cub EX1 Iím building that will have the CC363i engine.

    Thanks,
    Gregg

  24. #224
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    Quote Originally Posted by Yeti_MN View Post
    Hey Steve:

    Do you have any experience with the 3 blade 78” STOL prop? I debating whether to get that or the 82” two blade. It’s for a Carbon Cub EX1 I’m building that will have the CC363i engine.

    Thanks,
    Gregg
    I do not. I will ask about it though.
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  25. #225

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    I see on the Sensenich website that they have a ground adjustable prop for lower hp engines. Anyone here heard anything about those, good, bad, or otherwise? I'd like to try one on my C90.
    Last edited by 1934A; 10-08-2022 at 08:55 AM.

  26. #226
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    There is a good prop coming for the C90. Molds are made but be a year or so. C76AF is available now.
    2F0K6 C76AF: 76" diameter in a 2 blade hub, wide blade to meet inertia requirements for C-90/O-200


    2F0K6 C78CFF: 78" diameter in a 2 blade hub, new design (mold should be getting cut within the next couple of weeks), composite layup redesigned to meet C-90/O-200 inertia requirements, anticipated ~100-150 RPM higher static engine speeds for similar cruise settings



    C78CFF-2 is the tip trimmed to 76" diameter.
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  27. #227
    BC12D-4-85's Avatar
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    I've been watching this Sen 2FO prop for my C-85 Stroker, a C-90 equivalent. It will revolutionize the performance especially on floats.

    Steve, what are the inertia requirements mentioned above?

    Gary
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  28. #228

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    Got one on a 0-235. Great performer on floats, wheels, wheel skis. The water takes a little finish off but otherwise no problems at all.

    Jim
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  29. #229
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    Quote Originally Posted by BC12D-4-85 View Post

    Steve, what are the inertia requirements mentioned above?

    Gary
    Not sure, I will find out.
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  30. #230

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    So this will be the same prop for C90, O200, O235?

  31. #231
    BC12D-4-85's Avatar
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    I see page 6 here re Installation Instructions notes Mass Moment of Inertia = 3900-4000 kg/cm^2 Not sure what that means except it'll not blow apart yet?

    https://www.sensenich.com/wp-content...2021-11-12.pdf

    Gary

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    Question Different pitch pin markings?

    Pitch pin question:
    I have the 2GOM8 C82BGF installed on a PA-18-150 O-360. Pitch pins marked 2-7. Chart from included instructions below.
    I also have the 2GOM6 C82F installed on a PA-18-150 O-320. Pitch pins marked 0-5. No chart included for PIN number to pitch. Do pins 0-5 = 2-7 and are the corresponding pitches the same??
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  33. #233
    BC12D-4-85's Avatar
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    You might measure the diameter of each pin where it contacts the blade stops. See if they are the same for similar Gage# ? Also, https://www.sensenich.com/wp-content...1297966148.pdf

    Gary
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  34. #234
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    Quote Originally Posted by See_ya View Post
    Pitch pin question:
    I have the 2GOM8 C82BGF installed on a PA-18-150 O-360. Pitch pins marked 2-7. Chart from included instructions below.
    I also have the 2GOM6 C82F installed on a PA-18-150 O-320. Pitch pins marked 0-5. No chart included for PIN number to pitch. Do pins 0-5 = 2-7 and are the corresponding pitches the same??
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    Pins are 0-7 incrementally increasing pitch. Same blades, different hub. There will be a chart when the prop for the PA18-150/160 is STC'd I am almost certain.
    Steve Pierce

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  35. #235

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    Quote Originally Posted by Steve Pierce View Post
    Pins are 0-7 incrementally increasing pitch. Same blades, different hub. There will be a chart when the prop for the PA18-150/160 is STC'd I am almost certain.
    pins are stamped 0-5. But I get it.
    thanks much. I assumed they were the same otherwise.

    best, Brett Click image for larger version. 

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  36. #236
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    O-320 prop comes with 0-5 pins and O-360 prop comes with 2-7 pins.
    Steve Pierce

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  37. #237
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    Looks like we will be able to use my airplane for the noise testing and hoping to do that before Thanksgiving. From what I know that is the last step in obtaining the STC.
    Steve Pierce

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  38. #238

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    I just broke down and got an other borer prop for the ski flying season -- just cant wait any longer.

  39. #239

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    Quote Originally Posted by Steve Pierce View Post
    Looks like we will be able to use my airplane for the noise testing and hoping to do that before Thanksgiving. From what I know that is the last step in obtaining the STC.
    Any sign of the noise testing?

  40. #240
    Steve Pierce's Avatar
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    Quote Originally Posted by BritishCubBloke View Post
    Any sign of the noise testing?
    No, more ideocracy. I update this thread as progress is made.
    Steve Pierce

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