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Thread: ML GSX338 V2 P Sport Hydro 1st Build

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    Fitting the hatches:

    The front fiberglass hatch comes with pre etched lines on the long sides. I scribed over these with a pencil, as well as the front and rear cut points. The carbide wheel Dremmel tool made easy work of cutting the fiberglass. The front of the fiberglass hatch needs some retention tabs. I made the 3 you see from some plywood scraps. I ground the wood thinner with a sanding block to form a step. This now fits perfectly under the front deck.
    The rear hatch is just a piece of plywood. Minimal fitting was required.
    Attachment 158631Attachment 158632Attachment 158633Attachment 158634
    Bob Zola
    Owner Mojo Racing Products/Giant Power USA
    NAMBA 212/IMPBA 21206S

  2. Default

    Fitting the hatches:

    The front fiberglass hatch comes with pre etched lines on the long sides. I sribed these with a pencil, as well as the front and rear cut points. The carbide wheel Dremmel tool made easy work of cutting the fiberglass. The front of the fiberglass hatch needs some retention tabs. I made the 3 you see from some plywood scraps. I ground the wood thinner with a sanding block to form a step. This now fits perfectly under the front deck.
    The rear hatch is just a piece of plywood. Minimal fitting was required.
    116.jpg117.jpg117.jpg119.jpg
    Bob Zola
    Owner Mojo Racing Products/Giant Power USA
    NAMBA 212/IMPBA 21206S

  3. #63

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    What a great build! thanks for posting everything in such detail, really good stuff! looking forward to the finished product. Man, You really blew through this.

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    Steering and driveline:
    Installed a Hitec water proof servo on a TFL mount. I used a 440 rod with ball joint connector on the Speedmaster rudder.
    Set the strut for a flat 0 degree setting for a base line. Installed a 1/4" tube through a 5/32nd shaft log. I mount the motor first and cut a sloppy slotted hole. Then I use CA glue to hold the shaft log, tweaking the log until I get a nice alignment. Once in position, I used epoxy and fiberglass cloth to secure. Bee sure to scuff up your outer shaft log tubing so the adhesives stick! The shafttube was annealed and bent with the 3/16" flex shaft inside. After the bend was satisfactory, I re-tempered the brass with my torch and quenched.
    I also installed the hard line 3/16th tubing plumbing. Aluminum tube makes great durable light weight water lines! The thick transom and sides were drilled with a 3/16th bit. Just slide the tube through and secure with epoxy.

    121.jpg123.jpg122.jpg124.jpg
    Last edited by mojoracer; 04-17-2018 at 01:39 PM.
    Bob Zola
    Owner Mojo Racing Products/Giant Power USA
    NAMBA 212/IMPBA 21206S

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    I installed a Mojo racing Products 40 size stainless steel turn fin on a custom made bracket. The back end of the bracket will have a cross brace to the center section. More about this later. The very first GSX 338 will be racing at the IMPBA Spring Nationals next week!
    125.jpg120.jpg
    Last edited by mojoracer; 04-15-2018 at 07:35 AM.
    Bob Zola
    Owner Mojo Racing Products/Giant Power USA
    NAMBA 212/IMPBA 21206S

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    Quote Originally Posted by R2315 View Post
    What a great build! thanks for posting everything in such detail, really good stuff! looking forward to the finished product. Man, You really blew through this.
    Thanks for the kind words. I'm motivated! I think this will be the right tool for the P-Sport job!
    Bob Zola
    Owner Mojo Racing Products/Giant Power USA
    NAMBA 212/IMPBA 21206S

  7. #67

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    you don,t think the bend in the shaft log isn,t too tight ?

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    Finishing it up:
    Installed front motor support and ran all the water lines. Found packaging the Castle ICE 240 across the front of bulkhead #4 worked pretty well. Laid the batteries in front of the ESC. CG is about 1.25" back from the sponson heels. Room to move batteries forward if need be. Installed RX and ran the wires. Put some reinforcements around the shaft log. Put a half ass spray bomb paint job over the primer. Temporary job until the lousy weather in Michigan breaks. The boat is about ready to test! Boat with all equipment installed weighs in at 8.5 lbs.
    126.jpg127.jpg128.jpg130.jpg
    Bob Zola
    Owner Mojo Racing Products/Giant Power USA
    NAMBA 212/IMPBA 21206S

  9. #69

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    Man you knocked this one out in a hurry! Looking forward to seeing it run next weekend!
    TOY BOAT RACER
    Sponsored by Smock Racing
    IMPBA National Records Director
    IMPBA Dist.13 Director
    IMPBA 19887CD
    NAMBA 1169

  10. Default

    Quote Originally Posted by Doug Smock View Post
    Man you knocked this one out in a hurry! Looking forward to seeing it run next weekend!
    Hope it works! Looking forward to racing with you guys next weekend!
    Bob Zola
    Owner Mojo Racing Products/Giant Power USA
    NAMBA 212/IMPBA 21206S

  11. #71

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    you would knock off a pound by fitting an f.e. cowl as those gp cowls are too heavy so I found.

  12. #72

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    They are not that heavy, trimmed down they don't even weight a pound! Weight is not as big of a deal as a lot of people think it is. Weight helps stabilize in rough water. Now P-Limited, yes, weight could be a factor, but with full P, there is far to much power to worry with cowling weight. If it is balanced, and moving, the air takes control of the boat, and proper trimming. I have seen the to much weight idea many times, and when you ask people who race week in and week out..they never have weighted their setups, because they know it is setup that creates speed!
    Laser cut, birch plywood rc race boat kits- WWW.MLBOATWORKSRC.COM WWW.WOODRCBOATKITS.COM

  13. #73

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    Isn,t the GP Cowl more suited to the lighter glow powered sport hydro ?

  14. #74

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    When you are running in the low 70's with a "P" Sport Hydro in race trim, Weight is your friend.

    Larry
    Past NAMBA- P Mono -1 Mile Race Record holder
    Past NAMBA- P Sport -1 Mile Race Record holder
    Bump & Grind Racing Props -We Like Em Smooth & Wet

  15. Default

    Quote Originally Posted by rol243 View Post
    you would knock off a pound by fitting an f.e. cowl as those gp cowls are too heavy so I found.
    The trimmed cowl weight is 7.5oz.
    This boat is of similar weight of the other P sports that run in our club in MI. My old P-Sport was 11 lbs and did 69 MPH on the 1/6th mile oval with a 545 2 blade prop.
    Last edited by mojoracer; 04-17-2018 at 01:47 PM.
    Bob Zola
    Owner Mojo Racing Products/Giant Power USA
    NAMBA 212/IMPBA 21206S

  16. Default

    Quote Originally Posted by cybercrxt View Post
    They are not that heavy, trimmed down they don't even weight a pound! Weight is not as big of a deal as a lot of people think it is. Weight helps stabilize in rough water. Now P-Limited, yes, weight could be a factor, but with full P, there is far to much power to worry with cowling weight. If it is balanced, and moving, the air takes control of the boat, and proper trimming. I have seen the to much weight idea many times, and when you ask people who race week in and week out..they never have weighted their setups, because they know it is setup that creates speed!
    This 338 cowl trimmed up was 7.5oz
    Bob Zola
    Owner Mojo Racing Products/Giant Power USA
    NAMBA 212/IMPBA 21206S

  17. #77

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    Quote Originally Posted by TRUCKPULL View Post
    Bob is this your first wood build?

    Have fun with it.
    You will never ever again buy a glass hydro.

    Larry
    is wood better than glass?

  18. #78

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    Quote Originally Posted by urbs00007 View Post
    is wood better than glass?
    If build right, with sharp edges, YES.
    Also the glass hull makers can not keep up with the changes in hull design.

    You can also make your own changes to try something out, or incorporate a change that someone else has done that works.

    Larry
    Past NAMBA- P Mono -1 Mile Race Record holder
    Past NAMBA- P Sport -1 Mile Race Record holder
    Bump & Grind Racing Props -We Like Em Smooth & Wet

  19. #79

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    Nice job!! I hope to see some video.

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    The new boat ran good right out of the box in Atlanta. By the 2nd run the GSX 338 was fast and cornered great. Started with ABC H-5 and positive strut angle. The boat hopped down the straight. Doug Twaits helped me on the set-up. We leveled the strut angle and tried an ABC 1815 17 2 blade and the boat aired out and ran great. Pretty much ready to race. The strut dept was set so the bottom plane of the hull was parallel with the set-up board. Played with fin angle to settle the boat down a bit more. Ran 4 runs on Friday practice and was satisfied with the performance.
    The 338 behaved pretty well in 7 boat heat race water. I tried a 1914-17 ABC 2 blade in the 3rd heat and flipped it. Boat was stupid fast, but the nut behind the wheel pushed it too hard after nailing the start. Lots of glare late in the day is tough to race in. Ended up in 3rd place for the class. Will be tuning on it a bit more before Sundays MMEU club race #1 next weekend. I have a video of a test run I will post later today.

    DSCN0537.jpg
    Last edited by mojoracer; 04-26-2018 at 01:28 PM.
    Bob Zola
    Owner Mojo Racing Products/Giant Power USA
    NAMBA 212/IMPBA 21206S

  21. #81

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    Those ML are fast when setup. You may try a ABC 1816 2 blade prop.

  22. #82

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    Just saw a video of the GSX338 over on the Pearl page running in the same heat. These P sport hydros are really running fast these days!
    Laser cut, birch plywood rc race boat kits- WWW.MLBOATWORKSRC.COM WWW.WOODRCBOATKITS.COM

  23. #83

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    Yes, they are really hauling it. I kinda ducked out of P sport, can't keep up.
    Club Galvatron

  24. #84

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    Boat looks good as usual, Bob! Although, I kinda like the old 'Mojo Racing' sticker with the flags better!

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    Test run #2
    Bob Zola
    Owner Mojo Racing Products/Giant Power USA
    NAMBA 212/IMPBA 21206S

  26. #86

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    Vary nice!!

  27. #87

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    Bob

    In the video you were running about lane 4-5
    But your lap times were still 13 -14 - 14 seconds for the three laps.

    Now that is quick.

    Two lap record coming up?

    Larry
    Last edited by TRUCKPULL; 04-28-2018 at 11:06 AM.
    Past NAMBA- P Mono -1 Mile Race Record holder
    Past NAMBA- P Sport -1 Mile Race Record holder
    Bump & Grind Racing Props -We Like Em Smooth & Wet

  28. #88

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    What size motor and kv is in this boat?

    Trev

  29. #89

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    Looks good!!

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    Quote Originally Posted by racerr73 View Post
    What size motor and kv is in this boat?

    Trev
    NEU 1521 2050Kv
    Bob Zola
    Owner Mojo Racing Products/Giant Power USA
    NAMBA 212/IMPBA 21206S

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