REFLECTOR: Water Cooling

[Bob Kuc]

Could the use of a electric fan (as in cars) be of any help with the NACA downdraft?
  ----- Original Message ----- 
  From: Alex Balic 
  To: Velocity Aircraft Owners and Builders list 
  Sent: Wednesday, October 20, 2004 8:50 PM
  Subject: RE: REFLECTOR: Water Cooling


  Kurt,

  It is true that you can not use the NACA'a to best effect with a watercooled type radiator.  They do not develop the type of pressure differential that ram scoops do- the air tends to pile up on the ramp, and spill out of the scoop- not to say that you will not get enough airflow, just not too much pressure- this could, or could not effect the installation- I am using them to cool my turbocharger intercooler (also probably not the best application fro a NACA) an oil cooler (flat plate type with high bypass, so that should work fine) and general cooling of the engine compartment in general. For my single radiator, I am going to have a ram scoop-   Dave Bertram is using the armpit ram scoops for his 383 Chevy installation, the only problem there being that they are not really out of the boundary layer, but hopefully, there will still be plenty of airflow.  You might have enough airflow anyway, hopefully will not be a problem for you, but please keep all of us watercooled guys informed!!!

  Alex
    -----Original Message-----
    From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On Behalf Of NMFlyer1 at aol.com
    Sent: Wednesday, October 20, 2004 6:32 PM
    To: reflector at tvbf.org
    Subject: Re: REFLECTOR: Water Cooling


    I am using the big NACA ducts on the top of the fuselage, one feeds a radiator, The other is for induction and flow air. I have another NACA inderneath that feeds the lower radiator (with a little more ram pressure when climbing).  The upper is situated so that it drains "around" critical items, and out the weep hole in the bottom of the cowl.  

    I recently bought a cabin cover from bruces custom covers for my 235. I noticed that they have one for the Velocity. If the quality of the one I have is the same as the Velocity one, that would be very nice protection for "on the ramp" rain and sun, since it would cover the cabin and the naca inlets. 

    I know AL said that Naca's weren't the best for use with radiators. Im hoping that he isn't 100% right on that one. I have an upper and lower NACA, but also have a boost cooler/heater in the nose.  With some luck, it will be enough. (keep in mind that "they" said the big NACA's wouldn't work on the top of the Velocity too :) Im not flying yet, and I do have a backup plan/mod if I need it. All in the name of Lowwwwwdrag. 

    Kurt Winker


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