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Thread: Joysway Razor 37 inch bare hull mono assembly

  1. #1

    Default Joysway Razor 37 inch bare hull mono assembly

    I picked up an old, unused fiberglass hull and hatch that was the Joysway Invincible Razor mono. The hull is 950mm/37in. x 255mm/10in. I found the original instruction manual online from years ago when it was out. I also found some reviews of it at the time. This boat has lived in a few different configurations including most recently the Joysway Alpha/Hobbyking HydroPro Inception (although these are now ABS hulls with outrunner motors, but very similar to the Razor from what I can tell).
    For $55 for the hull I figured, what they heck, I'll make this my first Fast Electric build/assembly (I have a few other boats, some FE RTRs and some scale models I built). Through some research on the forums and looking at the original instruction manual, I put together a parts list. Steve V. was kind enough to review my setup and made a few suggestions so now I have all the parts and I'm ready to build/assemble!
    Here are some pictures of the hull and parts. I'll list all the parts out in a separate post along with a few questions for you more experienced modelers. My objective is to make this a sport boat that I can play with at the lake with my kids and our other boats. Speed is not my main concern. I was looking at 6S power and RPM up to 30k. 40mph is, I think, an achievable goal and for the ponds and lakes we run in, that should be fast enough. Faster might be more fun, but it needs to handle the high winds and waves we see most of the season in Northwest IL.
    Invincible Razor assy4a.jpgInvincible Razor assy2a.jpgInvincible Razor assy1a.jpg
    Last edited by sciesielka; 01-05-2021 at 09:25 PM.
    Info and pictures about our Lindberg PT Boats; Playtron Candy; Racing Runabout; Pro Boat Stealthwake and more! Plus videos of our boats including upgrades, repairs, etc.

  2. #2

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    As mentioned above, here are the components for my 6-cell powered FE (the items with * I don't have yet)
    Leopard 4082 1250KV 2.5Y Motor w/water jacket
    TFL Carbon fiber heavy duty motor mount for 40mm motors
    OSE Raider 6s 150amp ESC with connectors
    Speedmaster Stinger Strut for 3/16"(.187") prop shaft (although I may swap this to my son's Stealthwake and use the Speedmaster strut I recently put on instead)
    Joysway Invincible Razor stock rudder replacement
    ProBoat Stealthwake rudder pushrod assembly
    OSE .187 (3/16") cable : 3/16" prop shaft : 2.75" long
    Speedmaster 1.5" x 1.5" Adjustable Metal Trim Tabs
    Metal Turn Fins (1 Pair) : Medium : 68mm Long
    OSE 5mm to 4.75mm (.187") Coupler
    Graupner K Series Prop 42mm – 3/16” bore
    Graupner K Series Prop 45mm – 3/16” bore
    *** I'll use these props for testing and then I'll get a CNC one of the right size ***
    1/4 OD K&S brass tubing #8131 for stuffing tube (I'm not using a Teflon liner)
    13/32 OD K&S brass tubing #8136 for the wet well tube (the transom is already drilled for this size tube)
    OSE Aluminum Small Water Outlet Black
    OSE Tow Hook / Cleat Size- Small tow hook
    Flex cable saver : .187 size
    * Cowl locks OSE 4 piece hatch screw down kit
    * Proboat drain plug hh-PRB0307 (maybe, maybe not)
    * 5mm Thrust Bearing (maybe, if it fits in the TFL motor mount)
    * Power HD 20MG waterproof metal gear, digital servo 20 Kg torque
    RoaringTop LiPo (I have 2): 55C 6500mAh 3S2P (Hard Case)
    Info and pictures about our Lindberg PT Boats; Playtron Candy; Racing Runabout; Pro Boat Stealthwake and more! Plus videos of our boats including upgrades, repairs, etc.

  3. #3

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    Last post for now and the questions ...
    1) The hull is a LOT more flexible than I expected. My ABS RTRs are stiffer. So I want to put in a layer of heavy fiberglass cloth. The inside of the hull is rough, so do I need to sand it first or just clean it and apply a layer or 2 of cloth? And what should I clean it with? This hull is old, so do I need to go with something heavy duty like acetone or alcohol or something else?
    My fiberglass experience is limited, but it's inside so I'm not expecting perfection. I just want to keep this hull from snapping if it flips or crashes!

    2) I would love to be able to add a flood chamber and have seen a few posts about how people have done it, but any links to how-to articles anyone has would be appreciated. Or any thoughts for or against is also appreciated!

    3) The original RTR of this boat has the batteries on both sides of the hull mostly in-line with the motor which seems that the Center-of-Gravity (CG) would be way forward, but it must have worked. Assuming I do a flood chamber I would put the batteries in the middle like the Pro Boat Sonicwake either towards the bow or closer to the stern depending. Or, even if I don't do a flood chamber, is it better to keep the batteries centered and low?

    4) With the target CG at 25% to 30% of the length [235mm/9-1/4in. to 282mm/11-1/8in.], I assume I need to rough lay out all the components AND batteries to figure out where to put everything. Does this sound correct?

    Thank you in advance for any and all assistance!
    My webpage with videos and additional info on this boat is at: http://myplace.frontier.com/~sv_design/jsirbuild.html
    Info and pictures about our Lindberg PT Boats; Playtron Candy; Racing Runabout; Pro Boat Stealthwake and more! Plus videos of our boats including upgrades, repairs, etc.

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