User Tag List

Page 1 of 2 1 2 LastLast
Results 1 to 15 of 25

Thread: Dual pvs holes

  1. #1
    Join Date
    Feb 2004
    Location
    Belgium
    Posts
    1,986
    Thanks (Given)
    17
    Thanks (Received)
    9
    Likes (Given)
    10
    Likes (Received)
    20
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    Dual pvs holes

    I'm going to have some PVS vent holes milled in my scorpion prop.

    I'm thinking about getting dual PVS vent holes.

    Any one with a bravo xs or other dual vented prop that can measure how close the holes are to each other? Might like to get the distance center to center and also the distance between them on the max diameter (so not the hole but the milled surface).

    Is dual venting necessary on the scorpion?

    Thanks
    http://www.geocities.com/fletcher_arrowbeau

    Fletcher 17F6
    Hydrostream HST 20F

  2. #2
    Join Date
    Jun 2006
    Location
    Silverton section of Toms River, NJ/Stuart, Florida
    Posts
    10,316
    Thanks (Given)
    318
    Thanks (Received)
    262
    Likes (Given)
    723
    Likes (Received)
    1787
    Mentioned
    1 Post(s)
    Tagged
    1 Thread(s)
    I have drilled 7/8" holes in my 27p and its got an ok hole shot, you couldnt ski off it but you can run 100

  3. #3
    Join Date
    Feb 2004
    Location
    Belgium
    Posts
    1,986
    Thanks (Given)
    17
    Thanks (Received)
    9
    Likes (Given)
    10
    Likes (Received)
    20
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    So an extra vent hole would probably be a good idea. I would like to use it for skiing.

    How much rpm before it grabs and go?
    http://www.geocities.com/fletcher_arrowbeau

    Fletcher 17F6
    Hydrostream HST 20F

  4. #4
    Join Date
    Jun 2006
    Location
    Silverton section of Toms River, NJ/Stuart, Florida
    Posts
    10,316
    Thanks (Given)
    318
    Thanks (Received)
    262
    Likes (Given)
    723
    Likes (Received)
    1787
    Mentioned
    1 Post(s)
    Tagged
    1 Thread(s)
    It doesnt vent like this. Kinda just like a regular boat

  5. #5
    Join Date
    Jun 2014
    Location
    Columbus, OH
    Posts
    114
    Thanks (Given)
    23
    Thanks (Received)
    3
    Likes (Given)
    20
    Likes (Received)
    28
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I have a 3 blade with single PVS so not able to help with dims...

    But I'd like to add a question if that's ok:
    Could adding PVS holes to a balanced and blueprinted prop throw off the balance/ blueprinting?

    *Edit* Spoke with machinist, impact edm or milling and coolant will minimize heat, symetric locations about OD retain balance.
    More risk in fixturing/ handling
    Real question is do you drill your shiny new b&b prop or keep it pristine and buy another one with PVS..
    Last edited by NeedOne; 10-04-2017 at 09:25 AM.

  6. #6
    Join Date
    Oct 2004
    Location
    slough, england, united kingdom
    Posts
    1,318
    Thanks (Given)
    57
    Thanks (Received)
    62
    Likes (Given)
    200
    Likes (Received)
    151
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Yes it could throw the balance off, but not the blue printing of the blades.. easy to re-balance it afterwards

    about the largest size hole is 1 inch as from what I have seen.
    I would go for 3 holes of 1 inch diameter max size on a 3 blade then try it before going double holes.
    as for using it as a water ski prop its like using a prop with 2 inch lower pitch for pulling away.
    so if 2 inches less pitch will pull your skier up then you just might be on the right track, once on the plane it reverts back to being normal prop.

    best thing to do if you want to have pvs plugs is get the plugs first and drill to the size of the plugs.
    bottom of the vent need to be atleast 1/4 inch away from gearcase to work good. and do check there is no webs that would be hit with the drill.

  7. #7
    Join Date
    Oct 2004
    Location
    California
    Posts
    2,716
    Thanks (Given)
    721
    Thanks (Received)
    240
    Likes (Given)
    10719
    Likes (Received)
    2318
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by bigboy View Post
    I'm going to have some PVS vent holes milled in my scorpion prop.

    I'm thinking about getting dual PVS vent holes.

    Any one with a bravo xs or other dual vented prop that can measure how close the holes are to each other? Might like to get the distance center to center and also the distance between them on the max diameter (so not the hole but the milled surface).

    Is dual venting necessary on the scorpion?

    Thanks
    Don't know the numbers but here's one to look at.

    Wriggleys gum makes me think of boating, "Double your engines, Double your fun"



  8. #8
    Join Date
    Oct 2004
    Location
    slough, england, united kingdom
    Posts
    1,318
    Thanks (Given)
    57
    Thanks (Received)
    62
    Likes (Given)
    200
    Likes (Received)
    151
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    thats is a great pic of the double vents.
    Very nice looking propeller too/

  9. Thanks NICE PAIR thanked for this post
  10. #9
    Join Date
    Mar 2015
    Location
    Southeast Texas
    Posts
    136
    Thanks (Given)
    21
    Thanks (Received)
    16
    Likes (Given)
    38
    Likes (Received)
    39
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by phillnjack View Post
    about the largest size hole is 1 inch as from what I have seen.
    Bought a 30 pitch bravo one (4 blade) with (4) 1.25" holes in it last Friday. Still haven't spun it yet but it'll get ran this week...
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	FullSizeR.jpg 
Views:	60 
Size:	192.2 KB 
ID:	390028   Click image for larger version. 

Name:	529379879.jpg 
Views:	66 
Size:	330.3 KB 
ID:	390027   Click image for larger version. 

Name:	IMG_7033.jpg 
Views:	50 
Size:	305.1 KB 
ID:	390029  
    Last edited by Bullet 20cc; 10-17-2017 at 10:41 PM.
    96 Bullet 20cc, Yamaha OX 250+, 10" jack, labbed 30" Bravo LH w/1.25" exhaust pipes, counter rotating Bob's lower...it goes faster when you spin it the other way...

    02 Dodge Cummins 2500 reg cab 4x4, converted long to short bed, up a foot, twins, injectors, fully built auto, dyno'd 582hp/1015tq

    99 Dodge Viper GTS Coupe, 8.0L V-10, lowered 1", Corsa pipes/no cats, 450hp/500tq

  11. #10
    Join Date
    Oct 2004
    Location
    slough, england, united kingdom
    Posts
    1,318
    Thanks (Given)
    57
    Thanks (Received)
    62
    Likes (Given)
    200
    Likes (Received)
    151
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    1.25 inch vent holes seems very extreme,

    nice looking prop again, and a lefty too

  12. Thanks Bullet 20cc thanked for this post
  13. #11
    Join Date
    Mar 2015
    Location
    Southeast Texas
    Posts
    136
    Thanks (Given)
    21
    Thanks (Received)
    16
    Likes (Given)
    38
    Likes (Received)
    39
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks, I completely agree with very extreme. is exactly what my face looked like when I learned of it. Hoping for something similar to this face when it goes in the water. We will soon see...
    Last edited by Bullet 20cc; 10-19-2017 at 04:50 AM.
    96 Bullet 20cc, Yamaha OX 250+, 10" jack, labbed 30" Bravo LH w/1.25" exhaust pipes, counter rotating Bob's lower...it goes faster when you spin it the other way...

    02 Dodge Cummins 2500 reg cab 4x4, converted long to short bed, up a foot, twins, injectors, fully built auto, dyno'd 582hp/1015tq

    99 Dodge Viper GTS Coupe, 8.0L V-10, lowered 1", Corsa pipes/no cats, 450hp/500tq

  14. #12
    Join Date
    Oct 2004
    Location
    slough, england, united kingdom
    Posts
    1,318
    Thanks (Given)
    57
    Thanks (Received)
    62
    Likes (Given)
    200
    Likes (Received)
    151
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    well if that dont jump out the hole nothing will ha ha .

    what prop do you normally run ?

  15. #13
    Join Date
    Mar 2015
    Location
    Southeast Texas
    Posts
    136
    Thanks (Given)
    21
    Thanks (Received)
    16
    Likes (Given)
    38
    Likes (Received)
    39
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Haha...exactly! We will see today what she does...bout to head to the ramp.

    I got this LH30 as a package deal with another bravo LH24 (drag application) and a LH Bob's lower from a super good dude on here (Engineermike). So LH is a new world to me...so are Bravo props btw. Previously I spun a RH Hpdi case (factory cle) with several different props...3, 4 and even a 5 blade in 25 to 28 pitches. My favorite RH was a 28 trophy plus...has the holes but not this big.

    I did run the 24 Bravo already...extremely violent out of the hole and just keeps pulling hard all the way to the limiter...
    96 Bullet 20cc, Yamaha OX 250+, 10" jack, labbed 30" Bravo LH w/1.25" exhaust pipes, counter rotating Bob's lower...it goes faster when you spin it the other way...

    02 Dodge Cummins 2500 reg cab 4x4, converted long to short bed, up a foot, twins, injectors, fully built auto, dyno'd 582hp/1015tq

    99 Dodge Viper GTS Coupe, 8.0L V-10, lowered 1", Corsa pipes/no cats, 450hp/500tq

  16. #14
    Join Date
    Mar 2015
    Location
    Southeast Texas
    Posts
    136
    Thanks (Given)
    21
    Thanks (Received)
    16
    Likes (Given)
    38
    Likes (Received)
    39
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    OP...sorry for hijack. I would tune your scorpion for the main thing you want to do with it...scream and fly! And then pick up a very inexpensive/older used 4 or 5 blade in a lower pitch for skiing only. You will be much happier with a prop for each activity. Those stump pulling props are much better for your boat and motor too when only skiing. Prop changes are easy enough at the ramp and even on the bank as long as don't drop anything. I carry spare prop hardware in case I do that...I learned to do that the hard way...
    96 Bullet 20cc, Yamaha OX 250+, 10" jack, labbed 30" Bravo LH w/1.25" exhaust pipes, counter rotating Bob's lower...it goes faster when you spin it the other way...

    02 Dodge Cummins 2500 reg cab 4x4, converted long to short bed, up a foot, twins, injectors, fully built auto, dyno'd 582hp/1015tq

    99 Dodge Viper GTS Coupe, 8.0L V-10, lowered 1", Corsa pipes/no cats, 450hp/500tq

  17. #15
    Join Date
    Mar 2015
    Location
    Southeast Texas
    Posts
    136
    Thanks (Given)
    21
    Thanks (Received)
    16
    Likes (Given)
    38
    Likes (Received)
    39
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    phillnjack...ran the LH 30 bravo today with the 1.25" holes and I was amazed at the holeshot. Slips no more than half a second (perfect) and rpm's come up to upper 4k's then it grabs and jumps out of the water. If I floor it coming out I'll get another half second slip right after the boat leaves the water, rpm's come up again and then it lands and hooks up hard. Both hookups are bordering violent. If I just baby it coming out I'll only get the first slip and then I'm out and running clean. I think the second slip is only caused by the blades getting high on the water line. Night and day difference from my vented RH 28 trophy II...especially holeshot and acceleration.
    96 Bullet 20cc, Yamaha OX 250+, 10" jack, labbed 30" Bravo LH w/1.25" exhaust pipes, counter rotating Bob's lower...it goes faster when you spin it the other way...

    02 Dodge Cummins 2500 reg cab 4x4, converted long to short bed, up a foot, twins, injectors, fully built auto, dyno'd 582hp/1015tq

    99 Dodge Viper GTS Coupe, 8.0L V-10, lowered 1", Corsa pipes/no cats, 450hp/500tq

  18. Likes NICE PAIR liked this post
Page 1 of 2 1 2 LastLast

Similar Threads

  1. Replies: 24
    Last Post: 08-15-2016, 08:14 PM
  2. WTB 28p Bravo with dual pvs holes
    By KCBrains in forum Propellers Wanted
    Replies: 9
    Last Post: 06-06-2016, 08:05 PM
  3. 28" Bravo I with Dual PVS Holes
    By 1122 in forum Propellers
    Replies: 3
    Last Post: 09-09-2014, 02:45 PM
  4. 28 Bravo One with dual holes
    By bretter in forum Propellers
    Replies: 4
    Last Post: 03-23-2014, 04:24 PM
  5. Replies: 11
    Last Post: 12-31-2013, 08:12 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Spinelli Props