Does anyone know the owner of this Prius?

Discussion in 'Gen 3 Prius Fuel Economy' started by boywander, Feb 14, 2019.

  1. boywander

    boywander Junior Member

    Joined:
    Jan 24, 2019
    37
    7
    0
    Location:
    Washington
    Vehicle:
    2012 Prius
    Model:
    V
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    91,766
    41,395
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    that would be me :oops:
     
    VFerdman, m.wynn and davecook89t like this.
  3. boywander

    boywander Junior Member

    Joined:
    Jan 24, 2019
    37
    7
    0
    Location:
    Washington
    Vehicle:
    2012 Prius
    Model:
    V
    I actually thought of it when I got Prius fever lol.
     
  4. davecook89t

    davecook89t Senior Member

    Joined:
    May 10, 2016
    979
    714
    0
    Location:
    Washington State, Florida
    Vehicle:
    2017 Prius
    Model:
    Four Touring
    Nice try at gaining some more respect, @bisco, but the car has a PA license plate. I'm not buying it.;)
     
  5. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    91,766
    41,395
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
  6. Pluggo

    Pluggo Senior Member

    Joined:
    May 23, 2016
    604
    526
    0
    Location:
    Folsom, Pennsylvania
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Advanced
    It looks a bit over-designed in the rear. They eliminated the Kamm-tail and threw away decades of aerodynamic theory. Here's an excerpt from Wikipedia at Kammback - Wikipedia The key here is that "cutting off the tail resulted in minimal increase in drag." Everyone does it now.

    "The ideal shape to minimize drag is a teardrop. However researchers including Kamm found that abruptly cutting off the tail resulted in minimal increase in drag.[3] The reason for this is that a turbulent wake region forms behind the vertical surface at the rear of the car. This wake region mimics the effect of the tapered tail in that air in the free stream does not enter this region (avoiding boundary layer separation), therefore smooth airflow is maintained which minimises drag.[9]

    Kamm's design is based on the tail being truncated at the point where the cross section area is 50% of the car's maximum cross section,[3][11] which Kamm found represented a good compromise—by that point the turbulence typical of flat-back vehicles had been mostly eliminated at typical speeds.

    The Kamm tail presented a partial solution to the problem of aerodynamic lift, which was becoming severe as sport car racing speeds increased during the 1950s. The design paradigm of sloping the tail to reduce drag, carried to an extreme on cars such as the Cunningham C5-R, resulted in an airfoil effect lifting the rear of the car at speed, that could result in instability or loss of control. The Kamm tail decreased the area of the lifting surface while creating a low pressure zone underneath the tail."
     
  7. El Dobro

    El Dobro A Member

    Joined:
    Jul 12, 2011
    6,658
    3,029
    1
    Location:
    NJ
    Vehicle:
    Other Electric Vehicle
    Model:
    N/A
    Porsche tried it with their Langheck tail racers.
    [​IMG]
     
  8. boywander

    boywander Junior Member

    Joined:
    Jan 24, 2019
    37
    7
    0
    Location:
    Washington
    Vehicle:
    2012 Prius
    Model:
    V
    I’m curious to know what’s mpg is the Prius is getting.
    Even though Pluggo wrote about Kamm’s aerodynamic theory, seeing it believing in case of the aerocivic. Imagine that..
     
  9. ALS

    ALS Active Member

    Joined:
    Jul 15, 2009
    574
    282
    0
    Location:
    Pittsburgh
    Vehicle:
    2010 Prius
    Model:
    III
    I'd say with all those mods the owner probably hangs over on Ecomodder.com
     
    m.wynn likes this.
  10. Vman455

    Vman455 Senior Member

    Joined:
    Feb 8, 2014
    499
    513
    0
    Location:
    Champaign, IL
    Vehicle:
    2013 Prius
    Model:
    Two
    He or she isn't throwing away any aerodynamic theory; Kamm's design (actually invented by Koenig-Fachsenfeld for buses three years before Kamm published his first description of the design in 1939) was intended to maximize usable interior volume while minimizing drag, not to be the lowest-drag form possible at any cost. As Wolf-Heinrich Hucho described it in his monumental Aerodynamics of Road Vehicles:

    "In essence the result was as follows: Beginning at the maximum cross-section, the downstream contours of the body are carefully tapered so as to keep the flow attached. This produces a steady increase of static pressure in the flow direction. Just ahead of the location where the flow would want to separate, the body is truncated vertically, resulting in a plane base whose cross-section is small in comparison to the frontal area. The wake behind the vehicle is narrow, and negative static pressure on the flat base is moderate due to the upstream pressure recovery. Both contribute to low drag. Looking at Fig. 1.34 the advantages of this so-called "Kamm-back" (or in an often used abbreviation, K-back) becomes evident at once. In comparison to the shape of Lay, the headroom in the rear is far higher; compared to the contour of Klemperer, a good part of the length is saved" (Hucho, W-H. Aerodynamics of Road Vehicles, 4th ed. Warrendale: Society of Automotive Engineers, Inc., 1998, 29).

    Kamm's designs were still high drag by modern standards. He estimated his K3 (1939) at Cd .24, but testing the car (which still exists) in the VW wind tunnel in the 1980s indicated its actual drag coefficient is .37. The ideal length:depth ratio for low drag is somewhere around 4:1 to 5:1, much longer than K-form cars; this is evident when you look at low drag production and concept cars:

    [​IMG]
    Mercedes C111 III, 1977: Cd .18

    [​IMG]
    Volkswagen XL1, 2014: Cd .189

    [​IMG]
    GM Aero 2002, 1983: Cd .14

    [​IMG]
    Ford Probe V, 1985: Cd .137

    [​IMG]
    Mercedes-Benz Concept IAA, 2015: Cd .19 (tail extended)

    It's really, really hard--if not impossible--to get Cd numbers like that without a long, tapered tail.
     
  11. Zeppo Shanski

    Zeppo Shanski Active Member

    Joined:
    Feb 5, 2019
    226
    119
    0
    Location:
    Chicagoland
    Vehicle:
    2005 Prius
    Model:
    Base
    One of my favorite cars ... it's original model to the U.S.. ... In addition to its hybrid drive system, the Insight was small, light and streamlined — with a drag-coefficient of 0.25. At the time of production, it was the most aerodynamic production car, ever.

    HondaInsight.jpg Honda_Insight_Back.jpg
     
    DLC82SV and KennyGS like this.
  12. KennyGS

    KennyGS Senior Member

    Joined:
    Mar 28, 2014
    1,243
    1,040
    1
    Location:
    Keystone State
    Vehicle:
    2014 Prius
    Model:
    Five
    I agree, and always compliment the owner when I have an opportunity. (y)
     
  13. orenji

    orenji Senior Member

    Joined:
    Aug 17, 2013
    5,865
    3,461
    0
    Vehicle:
    2010 Prius
    Model:
    Three
    I had one for a few years. Liked it but kept have smog equipment failures.
     
  14. KennyGS

    KennyGS Senior Member

    Joined:
    Mar 28, 2014
    1,243
    1,040
    1
    Location:
    Keystone State
    Vehicle:
    2014 Prius
    Model:
    Five
    What was the issue?
     
  15. DLC82SV

    DLC82SV Member

    Joined:
    Jul 16, 2018
    241
    118
    0
    Location:
    81212
    Vehicle:
    2008 Prius
    Model:
    ----USA----
  16. orenji

    orenji Senior Member

    Joined:
    Aug 17, 2013
    5,865
    3,461
    0
    Vehicle:
    2010 Prius
    Model:
    Three
    Smog senors would fail. Honda always covered the repair, but if I had to pay it was like $800.00. So that was the reason I sold it.

    Original Honda Insight.
     
    #17 orenji, Mar 2, 2019
    Last edited by a moderator: Apr 9, 2019
  17. Judgmental Kitty

    Judgmental Kitty New Member

    Joined:
    Apr 9, 2019
    1
    1
    0
    Location:
    Fresno, TX
    Vehicle:
    2012 Prius c
    Model:
    Four
  18. ALS

    ALS Active Member

    Joined:
    Jul 15, 2009
    574
    282
    0
    Location:
    Pittsburgh
    Vehicle:
    2010 Prius
    Model:
    III
    Someone asked on a board if you were to convert a car to a hybid what would you use. Well if I was under six foot tall I would choose a SAAB Sonett III. It had a .32Cd and weighed in around 1900 Lb's. The reason I said IF I was under six foot tall is this car is tiny.

    Saab_Sonett_III_1.jpg
     
  19. Prodigyplace

    Prodigyplace Senior Member

    Joined:
    Nov 1, 2016
    11,603
    11,171
    0
    Location:
    Central Virginia
    Vehicle:
    2017 Prius
    Model:
    Two
    How about a fiberglass bodies Bricklin SV-1?

    [​IMG]
     
Loading...