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Thread: NP propellor vs Wirlwind

  1. #1

    Join Date
    Jul 2018
    Location
    albury australia
    Posts
    14

    Default NP propellor vs Wirlwind

    Hi All,

    I am currently in the process of shopping for a new 3 blade ground adjustable prop. I was sold on the WW 75'' stol but have now been exposed to the 75'' NP 3 blade. The NP is a very nice looking swept blade design at a fraction of the cost of the WW. I am seeking any experience with either of these two props. I have a series 5 round cowl 100 hp 912. The reason for my choice of 3 blade is simple looks on the round cowl KF.
    James Doyle
    Aussie aircraft engineer
    Series 5 barn find in repair
    912ULS-Kiev 3 blade-round cowl

  2. #2
    jonstark's Avatar
    Join Date
    Nov 2013
    Location
    Ashfield, MA
    Posts
    149

    Default Re: NP propellor vs Wirlwind

    Where are you seeing info on the np prop? Iím looking at props too.

    Jon
    Kitfox IV 1050, C180. Now I have two backcountry planes! WooHoo!

  3. #3

    Default Re: NP propellor vs Wirlwind

    Are you referring to NR/Luga propellers or is there also a NP prop? I just received my 2 blade NR 81" scimitar prop that will eventually go on my Yamaha Apex, but I ordered an adapter to run it on my model 5 with the Lycoming O-290. I currently run a 72" Whirl Wind ground adjustable GA200L. I am very happy with the compromise performance of the GA200L, but would like more STOL performance and less cruise speed, so I'm going to try the NR this week. I'll report back. I did a static pull test with the GA200L 72" and it pulled 400 lbs, I then tried a GA200L-STOL 78" and it pulled 461 lbs, but I lost 5 mph in cruise. Interested to see what the NR prop pulls.
    Bryan
    Project Kitfox
    Bowen Aero LLC
    Kitfox Model 5 Lycoming O-290 D powered
    Building a Model 7 Apex powered
    Redding, CA
    http://www.youtube.com/c/ProjectKitfox

  4. #4
    Senior Member
    Join Date
    Dec 2017
    Location
    Mapleton,UT
    Posts
    888

    Default Re: NP propellor vs Wirlwind

    You run the NR prop yet?
    Dustin Dickerson

    Building 7ss STI x 2
    Oratex
    29" shock monster
    EP912STI 155hp
    Garmin
    N33TF......FLYING!
    N53TF......FLYING!

  5. #5

    Default Re: NP propellor vs Wirlwind

    I did. So here are some interesting numbers. It weighs 8.576 Lbs less than the Whirl Wind GA 200 72." The static pull with the Whirl wind set at a static RPM of 2400 was 400 lbs, the NR prop was 485 lbs at the same RPM. I will fly it more on Tuesday and report back with better cruise and fuel burn numbers, but I saw maybe a 2-3 mph drop in cruise speed. Climbs crazy good and brakes real good at idle in a decent.
    Bryan
    Project Kitfox
    Bowen Aero LLC
    Kitfox Model 5 Lycoming O-290 D powered
    Building a Model 7 Apex powered
    Redding, CA
    http://www.youtube.com/c/ProjectKitfox

  6. #6
    Senior Member
    Join Date
    Dec 2017
    Location
    Mapleton,UT
    Posts
    888

    Default Re: NP propellor vs Wirlwind

    Cool thanks for the numbers. How are you doing static thrust test? What scale and where are you attaching at?
    I plan to move my plane coming up soon to the airport and I am going to do some full power runs and want to do some static test.
    Dustin Dickerson

    Building 7ss STI x 2
    Oratex
    29" shock monster
    EP912STI 155hp
    Garmin
    N33TF......FLYING!
    N53TF......FLYING!

  7. #7

    Default Re: NP propellor vs Wirlwind

    It is a pull scale attached to the ground and then to the airplane with a tow strap. It would be great to get a comparison chart together with the different engines and prop combinations to see how much each pulls.
    Bryan
    Project Kitfox
    Bowen Aero LLC
    Kitfox Model 5 Lycoming O-290 D powered
    Building a Model 7 Apex powered
    Redding, CA
    http://www.youtube.com/c/ProjectKitfox

  8. #8

    Join Date
    Oct 2017
    Location
    St. George, UT
    Posts
    85

    Default Re: NP propellor vs Wirlwind

    Any updates on the NR props comparison? Looking at the 107.

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