Page 1 of 5 1 2 3 ... LastLast
Results 1 to 10 of 47

Thread: Diversion ? Ski

  1. #1
    Thrust Whisperer Doc Nozzle's Avatar
    Join Date
    Aug 2009
    Posts
    36

    Diversion ? Ski

    Hi - I started this thread over in Sea Doo land but it was suggested I re-post here. I am not your normal PWC owner. I'm actually a jet boat owner. Like many of you guys, we jet boat enthusiasts are always trying to find the next trick to improve the performance of our jets. One of the challenges is how to try out a new idea or do a test on an 18+ foot, 2000+ lb, 650+ hp boat. Especially when it comes to intake ideas - because nobody wants to chop up the hull of their boat and fabricate an entire intake/inlet assembly just on the "hope" that it will work better.

    So a couple of us have decided that the best way to attempt to prove/disprove some of our ideas is to play with "scale models" first and then, IF any of the ideas seem to work at scale, try them out at full scale. I am going to "heavily modify" the hull of a wrecked SeaDoo GSX so that I can try out a few ideas and get some flow data.

    Basically I am creating a Test Sled that can be towed behind my boat at 20-30 mph while I play with different intake/gullet geometries and configurations.

    PS - I hope you all will forgive me for the radical surgery I have performed to one of your PWC hulls. It is for the greater glory of science!!!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Before1.JPG 
Views:	59 
Size:	79.1 KB 
ID:	145933   Click image for larger version. 

Name:	DSC00773.JPG 
Views:	48 
Size:	69.6 KB 
ID:	145934   Click image for larger version. 

Name:	DSC00774.JPG 
Views:	44 
Size:	77.3 KB 
ID:	145935  
    Last edited by Doc Nozzle; 08-16-2009 at 09:15 AM.


  2. #2
    Thrust Whisperer Doc Nozzle's Avatar
    Join Date
    Aug 2009
    Posts
    36

    Surgery Phase 1

    Here is the GSX hull after I did my thing with the sawzall. I was really impressed with how heavy the layups are on the three main sections of the hull. By 70's muscle boat standards this ski was 2X - 3X thicker than what I am used to seeing.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	DSC00777.JPG 
Views:	53 
Size:	71.0 KB 
ID:	145936  
    Last edited by Doc Nozzle; 08-16-2009 at 09:15 AM.

  3. #3
    Thrust Whisperer Doc Nozzle's Avatar
    Join Date
    Aug 2009
    Posts
    36
    Next I took my basic vision for the mods and sketched them out. I didn't want to cut too much off at once so it was a little bit of cut and study, plan, cut and study, plan...
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	ThePlan1.jpg 
Views:	51 
Size:	78.8 KB 
ID:	145937  

  4. #4
    Thrust Whisperer Doc Nozzle's Avatar
    Join Date
    Aug 2009
    Posts
    36

    Surgery Phase 2

    Next came the basic opening in the bottom of the hull. This will be the area where I bolt up different inlet configurations before I do a test tow and collect data. I don't want to have to spend a lot of time worrying about keeping things water tight, so the opening area will be open to the water.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	DSC00817.JPG 
Views:	43 
Size:	177.1 KB 
ID:	145939   Click image for larger version. 

Name:	DSC00820.JPG 
Views:	46 
Size:	191.0 KB 
ID:	145940   Click image for larger version. 

Name:	DSC00821.JPG 
Views:	41 
Size:	188.0 KB 
ID:	145941  

  5. #5
    Thrust Whisperer Doc Nozzle's Avatar
    Join Date
    Aug 2009
    Posts
    36

    Surgery Phase 3

    And then some final, minor trimming to clear off the interior floor mold from around the opening in the bottom. Later I will glass in a flange around here and also build up the interior sponsons and floor.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	DSC00827.JPG 
Views:	47 
Size:	201.4 KB 
ID:	145942   Click image for larger version. 

Name:	DSC00830.JPG 
Views:	41 
Size:	172.3 KB 
ID:	145943  

  6. #6
    Thrust Whisperer Doc Nozzle's Avatar
    Join Date
    Aug 2009
    Posts
    36

    Start of the Build Back

    Here is the plan for adding back some hull surface in the back. I started cutting and fitting in the new "stringers" that will box in this area and support the new floor.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	ThePlan3.jpg 
Views:	48 
Size:	141.5 KB 
ID:	145944  

  7. #7
    Thrust Whisperer Doc Nozzle's Avatar
    Join Date
    Aug 2009
    Posts
    36
    This is about as far as I will get for a couple of weeks. Have to go out of town for a biz trip.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	DSC00833.JPG 
Views:	46 
Size:	188.4 KB 
ID:	145945   Click image for larger version. 

Name:	DSC00834.JPG 
Views:	43 
Size:	139.8 KB 
ID:	145946  

  8. #8
    Hydrotoys's Avatar
    Join Date
    Jul 2005
    Location
    Mesa, AZ
    Posts
    16,712
    +1
    85
    Looks like a GSX-L, not a GTX hull.

    Plus one thing to consider... ALL watercraft HULLS, pulled behind another boat will behave drastically different, than being pushed by their own pump system. This is only, and without question, due to the down-force GENERATED by the impeller.

    I really am at a loss to see how you can get any meaningful data from this, but would love to follow along to see what you come up with.


  9. #9
    Thrust Whisperer Doc Nozzle's Avatar
    Join Date
    Aug 2009
    Posts
    36
    Quote Originally Posted by Hydrotoys View Post
    Looks like a GSX-L, not a GTX hull.
    Thanks for correcting me on that. I'm certainly not up on my model names! I fixed my posts.

  10. #10
    Thrust Whisperer Doc Nozzle's Avatar
    Join Date
    Aug 2009
    Posts
    36
    Update for all 2 or 3 of you that care! lol! The test sled passed leak check today. For now it seems to lay in the water OK. Won't really know how things are until I start towing and get into all that. Next phase is installing the flange or "window frame" that will allow me to bolt in different mockups of intakes. Once the flange is in and I have blended out the hull bottom where I had to add material, I will mount in a solid piece (window pane) to simulate a full hull bottom so I can tow it.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	IMG_3584.JPG 
Views:	47 
Size:	52.3 KB 
ID:	150533   Click image for larger version. 

Name:	IMG_3585.JPG 
Views:	38 
Size:	76.9 KB 
ID:	150534   Click image for larger version. 

Name:	IMG_3589.JPG 
Views:	37 
Size:	64.4 KB 
ID:	150535  

Page 1 of 5 1 2 3 ... LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Fastest ski's in the Nation getting together in my home town
    By Green Hulk in forum 4-Tec Performance
    Replies: 105
    Last Post: 05-20-2007, 10:00 PM
  2. What are the current records of the fastest ski's??
    By Therock in forum 4-Tec Performance
    Replies: 14
    Last Post: 05-20-2007, 06:39 PM
  3. What are you guys doing with stock parts off your ski?????
    By Jrsrxp in forum 4-Tec Performance
    Replies: 15
    Last Post: 09-30-2005, 05:57 AM
  4. The RXP is 10 times the ski the GPR is
    By LiquidDI in forum Sea Doo Open Discussion
    Replies: 23
    Last Post: 05-09-2005, 04:29 PM
  5. RXP's are great skis!
    By SuzanGPR in forum Sea Doo Open Discussion
    Replies: 3
    Last Post: 05-07-2005, 11:13 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
  •