Lighter Weight JAE 21

Discussion in 'Outrigger Hydroplane Forum' started by BobBonahoom, Dec 2, 2019.

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  1. Dec 2, 2019 #1

    BobBonahoom

    BobBonahoom

    BobBonahoom

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    We recently attempted to build a lighter JAE 21, but have not been able to test it since the water got hard here. I wanted to build a light boat but still be able to paint it with PPG Concept single stage car paint even though that adds a few ounces of weight.

    It came out fairly good at 3.40 lbs, with everything but fuel. We used a GT kit because I really like how easily it goes together with the laser cut and notched parts, but we think the G2 geometry has some advantages. So we cut the bait box off the GT, used the Tommy David mods on the front sponsons, and made the ski a little wider at 1-1/4". I have had very good success with a strutless 0.062" wire drive setup in my 12 JAE, so I set the 21 up with a strutless 0.078" wire drive and ball bearings. Its using small high voltage servos from Pro Modeler and a high voltage Futaba S-Bus receiver. That allows use of a small and light 200 mahr LiPo RX battery with no voltage regulators.

    A 3.0 lb 21 hydro still eludes us, but we are getting closer! Of course getting it too light may create a whole new set of handling problems on the course.
     

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  2. Dec 2, 2019 #2

    Lay26

    Lay26

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    why not make a Carbon fiber hull?
     
  3. Dec 3, 2019 #3

    BobBonahoom

    BobBonahoom

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    Good question. Not sure how to do that. Is it lighter than 1/16", 1/32" and 1/64" wood?

    Let's hear from others on how to do that and where you get the materials, thickness, areal densities of the carbon fiber, etc. compared to wood, etc.
     
  4. Dec 3, 2019 #4

    KenOlvis

    KenOlvis

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  5. Dec 3, 2019 #5

    KenOlvis

    KenOlvis

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    20191202_200220.jpg

    Use both carbon fiber an wood!!
    .21 size hull less than 3lbs is very do able base on the info I'm getting for my Glen Quarles Twin Texan .12 glen told me its is .21 size boat just wider for the twin .12
     
  6. Dec 3, 2019 #6

    Nigtmare

    Nigtmare

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    this boat is 2.75 lb ready to run.
    upload_2019-12-2_23-20-51.jpeg
     
  7. Dec 3, 2019 #7

    Richard Dahlheimer

    Richard Dahlheimer

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    Hello Bob, i like your build. I have the same motor, just heat cycled and the wind came up so never ran it. I hope to see your new hydro next season. Richard
     
  8. Dec 3, 2019 #8

    Butch Londrigan

    Butch Londrigan

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    Just ordered a boat from Mini craft rc Roman Sergeevich Agafonov from Siberia. All carbon fiber! Even carbon fiber turn fin.
     

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  9. Dec 3, 2019 #9

    Lay26

    Lay26

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    thats a pretty light build.....i was watching some artists on YouTube got alot of ideas on how to approach this.
     
  10. Dec 3, 2019 #10

    brad nichols

    brad nichols

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    Nice looking boat Butch!

    Brad
     
  11. Dec 3, 2019 #11

    Greg Bonahoom

    Greg Bonahoom

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    Looks Awesome Butch! Looking forward to racing against it next year. Do you know if Roman sells the turn fins separately? If so, do you have his contact info?

    Thanks!
     
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  12. Dec 3, 2019 #12

    Butch Londrigan

    Butch Londrigan

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    Yes he does Greg. He is on Facebook. They are real nice (stiff as heck)
     
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  13. Dec 4, 2019 #13

    BobBonahoom

    BobBonahoom

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    Butch, how much do you think it will weigh when its all done?
     
  14. Dec 4, 2019 #14

    ALLAN YUEN

    ALLAN YUEN

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    Look nice but turn fin doesn’t show ? Or only SAW?
     
  15. Dec 4, 2019 #15

    Butch Londrigan

    Butch Londrigan

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    Haven't received boat yet Bob. Will let you no. Pic of turn fin Allan.
     

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  16. Dec 4, 2019 #16

    Butch Londrigan

    Butch Londrigan

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    They fit right on a jae and 1/2 wt of aluminum fin.
     
  17. Dec 4, 2019 #17

    Butch Londrigan

    Butch Londrigan

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    Bob i see some work on the cooling fins and are you running 3ed channel?
     
  18. Dec 4, 2019 #18

    BobBonahoom

    BobBonahoom

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    Butch,
    Yes, I milled some off the fins on both sides and between the mounting holes to take out a little weight. The engines are running too cold anyway.

    I'm going away from 3rd channel needles on my smaller boats. I just set it by ear and its usually right where I want it. The 3rd channel just tempts me to go to lean, adds weight and more stuff that's heavy and can fail. I'm probably the only one who thinks that way about 3rd channel needles, just old school I guess.
     
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  19. Dec 4, 2019 #19

    brad nichols

    brad nichols

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    I have built a couple of boats out of carbon sheet with an end grain balsa core as the tub sides and bottom and top sheet was ply. One had an OPS 90 and ran very well until it lost it's life, running at speed a dog distracted the driver. His 67 powered boat is very fast, boats are the JAE 90-101. They say you should not bend the cloth at 90 degrees because it breaks the fibres.

    Brad
     
  20. Dec 5, 2019 #20

    timwhalen

    timwhalen

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    Yep, have a couple coming.
     

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