SOme Specs on Rare Bear

Discussion in 'Aviation' started by GregP, Sep 25, 2015.

  1. GregP

    GregP Well-Known Member

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    I found out some information on the Reno racer Rare Bear and thought the members might like to see it.

    A stock F8F-2 has a wing span of 35.5 ft and a wing area of 244 sq ft.

    Rare Bear’s specs are as follows:

    Span = 30.5 ft
    Area = 221.6 sq ft
    Effective Aspect Ratio = 4.20
    Root Airfoil = NACA 23015, Root Thickness to chord = 15%
    Tip Airfoil = NACA 23009, Tip Thickness to chord = 9%
    Wing Loading = 38.35 lbs. sq ft
    CL @ 540 mph = 0.045
    CL @ 490 mph = 0.055
    CL @ Landing = .807
    CL Max = 1.36
    CD = 0.0107 @ 540 mph

    Straight line top speed = 540 mph
    Closed course speed = 490 mph

    Found all this in a technical presentation by Dave Simon, Doug Hillson, and Chase Ashton. It was done right before Rod Lewis bought the aircraft. The only change since then that affects these is the fact that Rod Lewis doesn't use Nitrous Oxide during the race, but the system is still on the aircraft should he change his mind.

    I haven't seen this type of information for either Strega or Voodoo in this detail, but we can get some of the data over time.
     
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  2. drgondog

    drgondog Well-Known Member

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    Greg = CL at 5000 feet above SL? ------------> that will tell you GW
     
  3. drgondog

    drgondog Well-Known Member

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    #3 drgondog, Sep 26, 2015
    Last edited: Sep 27, 2015
    Voodo0 starts [when assuming P-51 Wing) with ~.016 for CDo at 9x10^^6 (about 160mph for MAC)way below compressibility drag rise from a stock P-51 airframe.. they could only do so much with canopy and new wing to take it down a little but for Rare Bear they had to peel 1/2 of their parasite drag to get the Cd figures claimed before compensating for compressibility.

    Thanks for the data Greg. I will play with simple calcs if you can get estimated HP or Thrust data for the 540mph runs?
     
  4. GregP

    GregP Well-Known Member

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    For anyone interested in it, the report I found can be seen at:

    http://www.dept.aoe.vt.edu/~mason/Mason_f/RareBear.pdf

    I'm afraid I can't say more than I posted because that's all there is ... but I could easily have missed it. It WAS late at night when I found this.
     
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