Welcome to Club Bennington

An official club forum for Bennington boats

Login Register

Which Prop for New 23RSR with Yamaha F300XCA

Discussion in 'Members Zone: Props and Power' started by sunnyside360, Oct 10, 2017.

  1. sunnyside360

    sunnyside360 Well-Known Member

    Messages:
    247
    Likes Received:
    31
    Location:
    Central PA
    Picked up my new 2018 Bennington 23RSR with Yamaha F300 XCA outboard on Saturday 10/7/2017. Most options are shown in signature. Currently going thru the specified break-in process with dealer installed Yamaha Salt Water Series II prop with 16 inch pitch. Put the hammer down briefly with 2.8 hrs on the meter and recorded the data below. This was with two adults, full tank gas (54+ gal), and approx 50 lbs gear. Speed data was taken using factory Garmin GPS.

    2000 rpm 9.66 mph
    3000 rpm 19.7 mph
    4000 rpm 28.4 mph
    5000 rpm 38.2 mph
    5900 rpm(wot) 44.8 mph

    I thought WOT would be more like the performance test data on Yamaha website, i.e., 47.3 mph at 6000 rpm for near identical boat and motor.

    The boat is used for water skiing, tubing and cruising usually with 6 to 8 people on board (teen age grand kids).

    Looking for some critique on the above data along with advice on propping. Thanks.
     
  2. Jb75

    Jb75 Well-Known Member

    Messages:
    69
    Likes Received:
    25
    Location:
    Greenville SC
    First congrats on a great boat. Looks to me if you are trimmed properly at wot you are probably pretty close to perfect at that mounting height. You would be able to squeeze more speed with a higher pitch but will lose acceleration. Moving the motor up one hole will get you even more top end but may increase your chances of ventilation when cornering. I'd possibly consider a 15 1/2x17 pitch.
     
    sunnyside360 likes this.
  3. Jb75

    Jb75 Well-Known Member

    Messages:
    69
    Likes Received:
    25
    Location:
    Greenville SC
    I've tried a 151/4x18 and 151/2x16 on my 2250 gsr(smaller and lighter than yours) with a 250 yammie. The 18 ran around 46.5-47 at 5400. it wasn't very weight sensitive. (I.e. That was topend whether loaded up or empty). The 16 is more sensitive to weight. Loaded at max capacity I can muster 40 and empty (just me and 15gals) 48.4 at 6100. I like the 16 better for our uses. Better low end punch for towing water sports. Seems to be about a 45 mph boat at lowest
    Mounting and typical load. 4 adults, 2 kids, Labrador and a big yeti. I have a 17 pitch I'll throw on soon just to see how it does.
     
    sunnyside360 likes this.
  4. cwag911

    cwag911 Moderator

    Messages:
    4,938
    Likes Received:
    1,088
    Location:
    Denver, NC on beautiful Lake Norman
    You should really wait until you've finished the break in to start shopping for props.
     
    sunnyside360 and Spoiledrotten like this.
  5. Alicedream

    Alicedream Well-Known Member

    Messages:
    493
    Likes Received:
    385
    Location:
    Warsaw, MO
    I have 2017 RCW with a Yamaha 300 XCA and have Saltwater II 17 pitch. My top end ranges between 46 to 49 depending on conditions. Keep in mind once you get to 45 you have to trim 3/4 to get to top end. My motor is also in the 2nd hole from the top.
     
    sunnyside360 and Spoiledrotten like this.
  6. sunnyside360

    sunnyside360 Well-Known Member

    Messages:
    247
    Likes Received:
    31
    Location:
    Central PA
    The motor is mounted in hole #1, lowest position the motor can be mounted. Readings were all taken at 1/4 motor trim. I didn't experience any prop ventilation yet but didn't do much turning at higher speeds. Will do some more testing after break-in. These props are ultra expensive but hopefully the dealer will be willing to try a different prop. Thanks.
     
  7. sunnyside360

    sunnyside360 Well-Known Member

    Messages:
    247
    Likes Received:
    31
    Location:
    Central PA
    Agree with you 100%. I am just looking for advice on propping for this setup for best all around performance. I know more testing needs to be done. Thanks.
     
    Last edited: Oct 11, 2017
  8. sunnyside360

    sunnyside360 Well-Known Member

    Messages:
    247
    Likes Received:
    31
    Location:
    Central PA
    Great, near identical boat as mine. The dealer considered both 16 and 17 inch props and wound up installing the 16 inch prop (Bennington recommendation). The motor is mounted in hole #1 (lowest setting) and the trim was set at 1/4 for all above test data. I'll vary the trim as you suggested after the break-in.

    Do you use regular, mid, or high octane gas? My manual specifies mid (89 octane). Straight 89 octane is very hard to find in central PA. I know some folks use higher octane 91 or 93, and some use lower octane 87 all of which are easier to find. Thanks.
     
    cwag911 likes this.
  9. cwag911

    cwag911 Moderator

    Messages:
    4,938
    Likes Received:
    1,088
    Location:
    Denver, NC on beautiful Lake Norman
    Always go higher. Our new 2017 Explorer will run on 87 but likes 93 octane much better, much more power.
     
  10. Jb75

    Jb75 Well-Known Member

    Messages:
    69
    Likes Received:
    25
    Location:
    Greenville SC
    im guessing based off my boat you have quite a way to go with the trim. my guess is you will get the extra 100 rpm and extra speed with trim between 1/2 to 3/4. the 16 may be just right in that mounting location.
     
  11. sunnyside360

    sunnyside360 Well-Known Member

    Messages:
    247
    Likes Received:
    31
    Location:
    Central PA
    Good. I will try 93 octane when I fill.
     
  12. sunnyside360

    sunnyside360 Well-Known Member

    Messages:
    247
    Likes Received:
    31
    Location:
    Central PA
    Little better performance would be great if more trim will help with the 16" prop.
    My last Bennington (2014 RL, ESP) with Evinrude 225HO and 17" pitch prop had great hole shot and top speed of 46.6 mph with light load. I'm hoping this boat will at least equal that. Could not trim Evinrude 225HO past 1/4 w/o issues. However, good all around performance and economy are important to me which means getting the right prop. Thanks.
     
    Last edited: Oct 11, 2017
  13. Alicedream

    Alicedream Well-Known Member

    Messages:
    493
    Likes Received:
    385
    Location:
    Warsaw, MO
    I use 91 octane all the time and occasionally have used 93 octane.
     
  14. sunnyside360

    sunnyside360 Well-Known Member

    Messages:
    247
    Likes Received:
    31
    Location:
    Central PA
    Just for grins, I found this Prop Slip Calculator http://www.go-fast.com//Prop_Slip_Calculator.htm and determined my prop slip is 12%. That is with 44.8 mph actual speed, 5900 engine rpms and 1.75 gear ratio. Speed with zero slip is 51 mph. I calculated prop slip for a few others with test data on Yamaha website and found they run around 7% to 8% with light loads. At 7-8% slip, my actual speed should be 47 mph. Suspect trim and motor mounting height are major contributors to the difference between 12% and 7/8% prop slip. Can't wait to get out again to complete the break-in process and do some more testing with the trim.
     
    Jb75 and Spoiledrotten like this.

Share This Page