[NSRCA-discussion] Engine cooling

[Lance Van Nostrand]

Paul,
This is a good idea.  We sell the scoops but I can vouch for the nasa duct idea.  It is on the plane I flew at Nats.  There's a picture on our website (www.aeroslave.com).  Go to the Symphony page and scroll to the bottom.  Also take a look at the chrome rendering picture.  On this you can see how the nose of the fuse curves so that a hole cut in the right spot is actually going to gobble some air from the oncoming freestream.  One thing I like about the nasa duct is it gives me a finger hold for my pointer finger because the Symphony fuse front is so wide you can't really grab it well.  Also, I put a black CF reverse scoop under the duct hole so you can't look in and see the crankcase.  Remember the incoming wind doesn't need to blow on the crankcase.  It will blow around the engine and be drawn into the faster moving air moving over the head.  This draws the heat from the whole crankcase area.

--Lance

  ----- Original Message ----- 
  From: Rex LESHER 
  To: NSRCA Mailing List 
  Sent: Saturday, September 15, 2007 1:34 PM
  Subject: Re: [NSRCA-discussion] Engine cooling


  Paul

  There are a few options...  If you don't like the looks of having a scoop on top of the fuselage nose, you can use a nasa duct.  All you will see
  is a somewhat teardrop shaped hole in the fuse....  The other way is to place a scoop on top.  Aeroslave has scoops you can order, or make one
  yourself and bond it on.  I like the nasa duct because you can simply grind the duct hole in the fuse and reseal the raw edges without  making
  a mess of the paint job.  The air directing scoop is bonded on the inside of the plane and directs air onto the crankcase.   I don't  have any
  pics of the ones I've used.  Maybe someone out there can help.  If not, I could sketch it out for you....  It's pretty simple to do, and doesn't take 
  much time.

  Rex
    ----- Original Message ----- 
    From: plachance at cox.net 
    To: NSRCA Mailing List 
    Sent: Saturday, September 15, 2007 8:38 AM
    Subject: [NSRCA-discussion] Engine cooling


    Hello all,

    Well after about 20 flights or so I finally solved my engine problem.  The engine was getting hot but only the crankcase half of the engine.  The head had good cooling but air could not get to or away from the crank case.  The problem is I now fly 5-6 flights one after the other with no down time between flights.  Last time I flew the plane the field was always packed so I would fly a flight and not fly again for a half hour or so, so the engine had a chance to cool down even though there was little to no airflow to the bottom half of the engine.

    The question of the day is...How are people putting scoops on the top of the engine compartment to get cooling air in to the crankcase?  I have a makeshift scoop made from the plastic lackaging from a hotwheels car but need to make and install a permanent scoop.  The plane is really ugly with the makeshift scoop but I have flown it and it proved to keep the engine cooler and the engine seems to be getting better with every flight as opposed to worse like it was.  

    Thanks in advance for the help.  My guess is I will need to fabricate something as I am leaving for a contest on the 21st.  It will be my first contest in about 10 years and I cannot wait.

    Paul LaChance
    Va Beach, VA
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