Tanaka pf4000 powered tadpole trike

Discussion in 'Motorized Trikes' started by AltonKeel, Feb 2, 2012.

  1. AltonKeel

    AltonKeel New Member

    I just finished putting together a kmx typhoon tadpole trike with a staton axle mount chain drive with a tanaka 40 cc two stroke. The bike came with 16 in fronts and a 20 in rear, I used a 26 in rear from staton and put maxxis hookworms all the way around.


    Here are some pics in my intro thread

    http://www.motoredbikes.com/showthread.php?t=36634
     
    Last edited: Feb 2, 2012

  2. AltonKeel

    AltonKeel New Member

    Pictures

    here are some pictures
     

    Attached Files:

    Last edited: Feb 7, 2012
  3. AltonKeel

    AltonKeel New Member

    So I've had the chance to break in the trike a bit and here is my first impression.

    Handling- The KMX with hookworm tires has extremely fast and precise handling , ok i'd even go so far as to say twitchy. I may put a steering damper on it . I did that to my last trike and it helped a lot . By using the Staton axle mount kit the center of gravity is low and the trike oversteers without any tendency to roll. It is light though and you wouldn't have to slide into much of a ripple to high side it.

    Propulsion - I really like the Staton axle mount chain drive system. The mount is low and very rigid . It will take all the horse power I dare to mount to it. I've started with a tanaka pf-4000. I have a 47r in storage somewhere in a another state but this will do for now. I did order the 15mm carb and a stalker free flowing muffler for it. I really like the tanaka, the bottom end is really well built. I need to work out a pipe that fits this bike , mount combination.

    I really wish that I could figure out a way to drive a nuvinci hub through the transmission from the left side. That would let me build a peaky engine and get it to the ground.
     
  4. AltonKeel

    AltonKeel New Member

    a picture of my first trike

    here is a picture of the sun with the tanaka 47r on it

    I put a tall gear on it and went to a deserted long perfectly flat road in central florida and clocked 73 mph on it.
     

    Attached Files:

  5. ollicat

    ollicat Member

    Keep posting your driving impressions. Also, how did the install go?
     
  6. AltonKeel

    AltonKeel New Member

    The install was a breeze, just had to drill three holes in the mount, two to mount the torque bar and one to attach the plate to the chain stay. The rest was not much more than a rear tire change. The mount ensures chain alignment to the gearbox so no tedious adjustments like the rack mount.
     
  7. ollicat

    ollicat Member

    Gotcha, tell me more about acceleration, comfortable cruising speed and top speed. How loud is the engine at cruising speed? Is the sound uncomfortable?

    How loud is the gearbox? What is peddling like with the engine off? Sorry for so many questions.
     
  8. AltonKeel

    AltonKeel New Member

    Top speed about 35 mph should add a bit more with the carb and silencer.
    As far as sound it's a weed eater ,but I ride with my motorcycle helmet with built in headphones so I don't notice. It pedals like stock you don't notice the motor. It will pull from a dead stop and acceleration is ok but should be better when the engine breaths better

    This ones not really for performance but I would like a little better acceleration

    If I want speed I ride my 170 hp turbocharged canam Spyder :)
     
  9. ollicat

    ollicat Member

    That is great news. I bought the kit for my Sunray SX and hope to install it soon. It looks so simple to operate and hides better than a rack or frame mount from the profile
     
  10. ollicat

    ollicat Member

    73 mph? I didn't think that was even possible
     
  11. 5-7HEAVEN

    5-7HEAVEN Member

    Ok, I'm interested, since I run a 47R.

    I'm presuming the gearbox had 18.75:1 ratio. What were your sprocket sizes?

    Is that the Tanaka-specific 3-piece pipe, and did you have to modify it to fit?

    How's your gas mileage?
     
  12. AltonKeel

    AltonKeel New Member

    5-7
    The sun is in storage up in Pa now and I haven't run it in a while. It had 20 in wheels all the way around. I don't remember what gear I had on it when I did that speed run but it was way tall, had to pedal to get started and it took about 3/4 of a mile to get to top speed.

    It was totally impractical but i just wanted to give it a try since I had some big sprockets laying around.
     
  13. AltonKeel

    AltonKeel New Member

    The pipe is the three piece and I didn't have to mod it just twisted at the existing joints to fit the sun. My ex is sending that pipe and the 47r to me and I'm gonna try to put it on the kmx but some modding maybe required
     
  14. AltonKeel

    AltonKeel New Member

    If you look at the picture of the sun you'll see that the top sprocket is bigger than the guard and it's the smaller one I ran day to day.

    As I remember I was running the 47r around 9300 rpm for the speed run, maybe a little more and the chain ratio was around 2.5 ( overdrive) ,the tire was 20in and the gear box was 18.75.

    Here is the math

    9300/18.75*2.5*pi*20*60/12/5280 = 73.78 mph

    So I think that's about right

    It was about a 40 tooth sprocket on the gear box and a 16 on the axle
     
    Last edited: Feb 8, 2012
  15. AltonKeel

    AltonKeel New Member

    Here is interesting data

    * Roadster Touring Racing Recumbent HPV
    Frontal Area(sq.m) 0.5 0.6 0.3 0.2 0.1
    Drag Coefficient (Cd) 1.2 1.4 0.9 0.5 0.2
    Rolling Resistance (Cr) 0.008 0.004 0.003 0.003 0.003
    Bicycle Mass (kg) 15 25 10 10 22
    Rider Mass(kg) 75 75 75 75 75
    Total Mass(kg) 90 100 85 85 97
    "Resistances of Cycling Machines Chart"

    Reproduced with permission from Bike Cult: The Ultimate Guide to Human Powered Vehicles by David Perry.**Published by Four Walls Eight Windows.
     
  16. AltonKeel

    AltonKeel New Member

    Vehicle weight: 72.6 kg / 160 lbs
    Crr: .003
    Cd: .5
    A: 0.2 m2 / 2.1527820833419 ft2
    Fuel energy density (Wh/US gal.): 33557
    Engine efficiency: .22
    Drivetrain efficiency: .95
    Parasitic overhead (Watts): 0
    rho: 1.22 kg/m3
     
  17. AltonKeel

    AltonKeel New Member

    Giving these results


    MPH KM/H Aero (a) Rolling (b) Total % Aero % Rolling Watts HP HP Aero HP Rolling MPG(US) L/100km
    5 8 0.30 2.14 2.44 12.49% 87.51% 5.46 0.01 0.00 0.01 6,428.05 0.04
    10 16 1.22 2.14 3.35 36.34% 63.66% 15.00 0.02 0.01 0.01 4,676.27 0.05
    15 24 2.74 2.14 4.88 56.22% 43.78% 32.71 0.04 0.02 0.02 3,215.70 0.07
    20 32 4.88 2.14 7.01 69.54% 30.46% 62.69 0.08 0.06 0.03 2,237.36 0.11
    25 40 7.62 2.14 9.75 78.10% 21.90% 109.02 0.15 0.11 0.03 1,608.27 0.15
    30 48 10.97 2.14 13.11 83.70% 16.30% 175.79 0.24 0.20 0.04 1,196.93 0.20
    35 56 14.93 2.14 17.07 87.49% 12.51% 267.07 0.36 0.31 0.04 919.11 0.26
    40 64 19.50 2.14 21.64 90.13% 9.87% 386.97 0.52 0.47 0.05 724.96 0.32
    45 72 24.69 2.14 26.82 92.04% 7.96% 539.57 0.72 0.67 0.06 584.92 0.40
    50 80 30.48 2.14 32.61 93.45% 6.55% 728.95 0.98 0.91 0.06 481.06 0.49
    55 89 36.88 2.14 39.01 94.53% 5.47% 959.20 1.29 1.22 0.07 402.14 0.58
    60 97 43.89 2.14 46.02 95.36% 4.64% 1,234.41 1.66 1.58 0.08 340.89 0.69
    65 105 51.50 2.14 53.64 96.02% 3.98% 1,558.67 2.09 2.01 0.08 292.47 0.80
    70 113 59.73 2.14 61.87 96.55% 3.45% 1,936.07 2.60 2.51 0.09 253.58 0.93
    75 121 68.57 2.14 70.71 96.98% 3.02% 2,370.68 3.18 3.08 0.10 221.88 1.06
    80 129 78.02 2.14 80.16 97.34% 2.66% 2,866.61 3.84 3.74 0.10 195.73 1.20
    85 137 88.08 2.14 90.21 97.63% 2.37% 3,427.93 4.60 4.49 0.11 173.91 1.35
    90 145 98.74 2.14 100.88 97.88% 2.12% 4,058.73 5.44 5.33 0.12 155.52 1.51
    95 153 110.02 2.14 112.16 98.10% 1.90% 4,763.11 6.39 6.27 0.12 139.88 1.68
    100 161 121.91 2.14 124.04 98.28% 1.72% 5,545.14 7.44 7.31 0.13 126.48 1.86
    105 169 134.40 2.14 136.54 98.44% 1.56% 6,408.91 8.59 8.46 0.13 114.90 2.05
     
  18. AltonKeel

    AltonKeel New Member

  19. 5-7HEAVEN

    5-7HEAVEN Member

    Man, that's FLYING! If the forum had a face off, you'd prolly win!

    I was lucky enough that same pipe fit in my center-framed bike. Like you, I twisted the joints. The head pipe was 90* off, so I used the kart's headpipe. Everything bolted on, even the OEM muffler.
     
  20. ollicat

    ollicat Member

    Too much math. My head hurts
     
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