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Thread: New Twin Cheetah build

  1. #1
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    Default New Twin Cheetah build

    Transom reinforced with two layers of 1.5mm coremat, hard angles filled with thickend epoxy, all seams under the deck have been reinforced with 4” CF, inlay done. Sponson nose filled with epoxy. Motor mounts,servo
    Mount and stuffing tube supports done. 8AB8B8EF-271C-45A5-8F58-2BA59B91909C.jpg8B432B9E-9BCB-424C-95AA-4F7002B7DD05.jpg2F51350A-D4CF-4928-94B2-7E5068505554.jpg38350C97-C879-4579-9C1A-C66FF2E9CED1.jpg
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    Last edited by royalcasa; 09-29-2018 at 07:30 AM.

  2. #2
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    Great start

  3. #3
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    Great start indeed.
    The hull seems to have anti gravity properties. An unfair advantage, methinks.
    But seriously, looking forward to the progress on this build.
    We have a few Cheetahs racing at our club. Not many twins though.
    Any ideas on motors & props at this stage?

  4. #4
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    Default Hardware

    ESC. Seaking 180 V2
    Motors 4050 2310
    Stingers MTC
    Rudder Speedmaster
    Servo low profile Sevox
    Props 447 2 blade by Andy Brown
    No spark connectors from OSE

    I opened up the water lines in the rudder as much as possible, I also bought the cooling jacket that would be for the 4060 TP it fits perfect on my 4050. Trying to do what ever I can to make it run cooler.

    66748D23-D226-4923-8AAC-229005781428.jpgF593C58D-86D9-48E5-A8D0-F7F5317F437E.jpg4204EB94-D7CC-4946-B7FD-403D05A1C551.jpgF1C5227B-9CC1-47CF-8C79-CCB329C72522.jpg
    Last edited by royalcasa; 09-30-2018 at 05:40 AM.

  5. #5
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    Does that Coremat actually add that much rigidity to the hull?

  6. #6
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    It does once it’s soaked with epoxy and dry. The area were the stingers will be mounted are about 1/4 thick and it’s hard, Some use a piece of CF and that’s fine to
    Last edited by royalcasa; 09-30-2018 at 06:32 AM.

  7. #7
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    Default

    Quote Originally Posted by Prodrvr View Post
    Does that Coremat actually add that much rigidity to the hull?
    If it is used as a core, to space 2 materials with high tensile strength appart, then yes hugely.

    As it has a very high compressive strength it actually does better in areas with bolts passing through it, than more modern cores that offer much better stiffness to weight ratios.

    With only one side of it covered, not so much, it has added 3mm of resin on top which will certainly give extra stiffness, but it will be a fraction of the stiffness that would be gained for the same weight, by using 2mm coremat and putting a few layers of glass over it.
    Paul Upton-Taylor, Greased Weasel Racing.

  8. #8
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    Oh ok. What I do is where the rudder and drives are mounted, I fit a piece of 3mm cf sheet and epoxy it in.

  9. #9
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    I guess I'm old school;
    I epoxy in a piece of 3mm or 4mm aluminium plate. Then drill & tap the hardware on. No need to fiddle about in confined spaces with nuts & washers.

  10. #10
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    Quote Originally Posted by 785boats View Post
    I guess I'm old school;
    I epoxy in a piece of 3mm or 4mm aluminium plate. Then drill & tap the hardware on. No need to fiddle about in confined spaces with nuts & washers.
    How big of a piece? That sounds heavy.

  11. #11
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    Heavy? No mate.
    The same size pieces that you would fit in carbon sheet for the mounting of stingers , struts or rudders in a cat.
    Those motors have the capability of delivering 6hp constant or 13hp max in total. Do you really think they will notice a couple of grams of aluminium?
    Absolutely not in my experience.

    I do the same for the hardware & turnfins on riggers & hydroplanes. Never an issue.

  12. #12
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    Very good

  13. #13
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    2F538F7C-4C74-45E4-BE32-8D8A8257F099.jpgTP vs HRC cooling Jackets, HRC jacket should be more efficient in cooling the motors

  14. #14
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    412502DA-0951-4FE3-AF66-C97DC970D573.jpgAnother piece of the puzzle arrived

  15. #15
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    4C23B379-175E-47B4-8EB6-C42A8A49FFEB.jpgNew 447 props Sharpened and Balanced by Andy Brown

  16. #16
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    This is a awesome build. I have a carbon fiber cheetah that I’m starting to collect all the parts for now to do a twin build. I have a question. Where did you get the carbon fiber motor mounts and the flex shaft tube supports from? That’s what I’m looking for to use in my build. Thanks

  17. #17
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    I had a OSE member, tickeman (Scott) make them for me PM him
    Or you can go to Facebook and look him up at Scottski Racing

  18. #18
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    Where did you get the stingers?

  19. #19
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    Awesome. Thank you. And ya I second on where can I find some stingers like that.

  20. #20
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    The stingers came from MHZ Powerboats in Germany great company to deal with.

  21. #21
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  22. #22
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    6221DD70-1B05-4342-9A44-9334F1CCC33E.jpg[ATTACH=CONFIG]162513[/ATTACHWater lines done. I have two like new SPC 4s 5000m for the Cheetah. They weigh 16oz each they r lighter than the Revo and Turnage.
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  23. #23
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    Did you get the SPC packs recently?

  24. #24
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    No, I got them before they stoped seling them

  25. #25
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    Quote Originally Posted by royalcasa View Post
    No, I got them before they stoped seling them
    Ahhh, ok thanks.

  26. #26
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  27. #27
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    TFL Zonda (124mph), Miss Geico Zelos 36 (108mph), Veles 29 (91mph), Zelos Twin 36 (90mph), Miss Geico 29v3 (83.5mph), Sonicwake 36 V2 (83mph), Blackjack 42 (81mph), TFL Pursuit (79mph), UL-19 (75mph), Sonicwake 36 (73mph), Motley Crew (47.5mph), AquaCraft Rescue 17

  28. #28
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    That’s a awesome build !!! I have a brand new carbon fiber cheetah that has never been drilled. If I didn’t have another boat I was building I would build it. But for now I’m going to sell it to compleat my current twin build

  29. #29
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  30. #30
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    Quote Originally Posted by Tsoltero19 View Post
    That’s a awesome build !!! I have a brand new carbon fiber cheetah that has never been drilled. If I didn’t have another boat I was building I would build it. But for now I’m going to sell it to compleat my current twin build
    Thank you

    What r you building love to see it. I like this hull so much that I was thinking of getting a CF Cheetah from MarineFe

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