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Thread: Blackjack 29 V3 .187 upgrade shaft

  1. #1
    Join Date
    Sep 2016
    Location
    KY
    Posts
    2

    Default Blackjack 29 V3 .187 upgrade shaft

    I purchased the upgrade strut and the .187 upgrade flex shaft for my blackjack 29 v3, can I use the 9/32 brass tubing with the .187 Teflon liner or do i have to use the 1/4 tubing without the liner? Is there enough material to mill the strut or tubing for fitment of the 9/32?

  2. #2
    Join Date
    Jul 2016
    Location
    IL
    Posts
    3,046

    Default

    for a 3/16" (.187) flexshaft use 9/32" tube w/ .187 liner or 1/4" tube w/o liner. Seems like a lot of work to replace the 1/4" tube already in the hull. I would just pull the teflon liner and run the .187 OSE shaft that way. Looking at the strut on my V3, the nose cone tapers down from 11/32" OD to just a hair over 1/4", so you could probably modify the strut if you felt inclined to go the difficult road.
    Vac-U-Tug Jr (13mph)

  3. #3
    Join Date
    Sep 2016
    Location
    KY
    Posts
    2

    Default

    The bare shaft on brass tube won't produce too much heat to cause a shaft failure?

  4. #4
    Join Date
    Jun 2015
    Location
    Wi
    Posts
    734

    Default

    Quote Originally Posted by Rayzor31 View Post
    The bare shaft on brass tube won't produce too much heat to cause a shaft failure?
    Not if the cable is well greased every run and the motor is aligned perfectly with the stuffing tube. I have 5 boats they all run 3/16 cables with no liners

  5. #5
    Join Date
    Feb 2014
    Location
    In
    Posts
    20

    Default

    Just remove the Teflon liner and run the 3/16th/.187 shaft on the stock tube. Been doing this for over a year at speeds of nearly 80mph on GPS....

    BlackJack-Miss Geico 29 V3 Leopard 4074 2200KV 78mph on GPS so far- FE Fun boat
    JAE 21GT B Hydro outrigger, Whiplash B Sport Hydro-Nitro Race Boats District-14
    www.ABMods.com

  6. #6
    Join Date
    Nov 2016
    Location
    MI
    Posts
    37

    Default

    what prop are you using looks crazy fast and stable

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