propulsion cure

Discussion in 'Propulsion' started by pba, Nov 25, 2017.

  1. pba

    pba Active Member

    Joined:
    Feb 6, 2009
    Posts:
    202
    Location:
    dayton
    I have found that using 540 motors from rock crawlers( rc cars) has allowed me to lick all my problems.
    The standard 540 motor is 27 turn which on 6v no load will draw 1.9 amps.The crawler motors come in 35,45,55,65,80,100 turns. A 55 turn motor draws .4 amps on the same 6 volts has torque out the
    yeng-yang ( a technical term for lots) and a much lower RPM. The best and cheapest (9.95-15.95)
    can be found on ebay made by rc4wd or just type in rc crawler motor. Some of thes come with an ESC
    for under 40.00 bucks. Servo City has a load of different couplers including the solid aluminum
    1/8 to 1/8 for 4.95. They also carry stainless 1/8 shafts real cheap and all tubing .I have been using them for years and they ship fast. They also have every servo made by futaba and hi-tech with custom mods for rotation (180 ect) for 10 bucks extra
     
  2. SteveT44

    SteveT44 Well-Known Member

    Joined:
    Nov 1, 2009
    Posts:
    1,855
    Location:
    MD
    Are these three or five pole armatures?
     
  3. Caractacus Patt

    Caractacus Patt Member

    Joined:
    Jan 22, 2019
    Posts:
    70
    Location:
    Granite Falls, WA
    What "Turn" of motor do you use for your ships, and what are their speed? I'm considering a pair of 80T motors for a 26 sec ship in direct drive, wondering if they will be fast enough, or will I need the 65T or 55T to make speed...
     
  4. djranier

    djranier Well-Known Member

    Joined:
    Jul 24, 2007
    Posts:
    1,756
    I was using 3 of the 80 turns in my Bismarck at Nats. They just got a little warn. Center shaft was direct drive, 2 outer were 2:1 geared. Got a 38 pound ship turning 1, 2.40 inch center prop up to 24 sec no problem.
     
  5. Caractacus Patt

    Caractacus Patt Member

    Joined:
    Jan 22, 2019
    Posts:
    70
    Location:
    Granite Falls, WA
    Cool, thanks for the info; I expect that with my newbie combat prowess, my opponents should be providing plenty of water-cooling for my motors should they start to get warm...:)