Paul,
             Thanks for the cooling book which gives so many practical ways
  to
  cure my problem.  The wedge, does it taper to be flush with the rear of
  the Rad,
  or should it be up say a half inch?  I assume that the inlet is to be the
  magical 1/3 of the area of the Rad ?  I expect that my actual inlet will
  only be
  about a foot before the rad, so is it better to go wider with the inlet
  rather
  than higher?
      THe curve before the outlet on the firewall, I have heard of this
 many
  times, but have never been able to get a drawing.  Have you dimentions
 etc
  available ??
      Thanks for a great book.  Met Fred Moreno at an Saaa meeting only a
  month
  or two ago.  His Lancair is flying at last but with a Lyc!!.   What
  happened? He
  now lives south of Perth which you probably know.
      Neil.

  ----------------------------------------------------------
  I think that may be a different Fred Moreno. Did he say he was on our
 news
  letter? If I had known he was there I would have tried looking him up
 when
  I was
  in Perth early this year.

  The end of the wedge must be right down on the core. In fact Ian out in
  Perth
  claims it is well worth doing the S curve trick. Second attachment Fig 4.
  He has
  reduced the size of his scoop drastically on his second RV6 and it is not
  cool
  in Perth during the summer time :)

  http://www.youtube.com/watch?v=uZ4NqGv6SwQ

  To answer the question on the size and shape of the scoop I need to know
  how
  fast your airplane flies. Slower airplanes can use larger openings to
 cool
  at
  lower climb out speeds. Also the use of a cowl flap is a factor. A nice
  cowl
  flap will allow a smaller scoop. I assume you have an RVx something or
  other.

  BTW folks don't be taken in by the supposed need  for a smaller pulley on
  the
  e-shaft to cut down the water pump speed. That may be true on a racing
  engine
  that is going 11,000 RPM but we never see more than 7500 with a 2.85:1
  gear box
  and 6500 with a 2.17:1 gear box.

  Also there is a remote possibility that taxi cooling can be helped by
 more
  water
  flow. Some body needs to do a little data taking on that subject one way
  or the
  other.

  Paul Lamar


 paul,
         First I fly a sportsman with a climb speed of 90 kts and a cruise
 speed of 135 kts.
 Yes I have a cowl flap but advice on clearances front and back closed and
 open will help. I have a 4inch stroke on the actuator at the back of my
 cowl
 flap.
    page 50 just above Cowl flaps,  "A large radius must be used on the
 firewall"---   Have you any drawings or specs please.
    The "S curve trick ??   Cannot find the attcahment. Page?? or
 descritpion please
         Neil

 Make the radius as large as you can comfortable fit on there. Something
 like 5
 inches would be pretty good. Increase the cowl flap angle to 45 degrees
 wide
 open. It will not affect the climb rate. Here are a few pictures.

 In the book the S curve  is on page 36 Fig.4. No coordinates yet so you
 have to
 eyeball it. Also there is a furnace blower test duct S curve picture on
 page 89
 next to Mikey. Not a real good picture but you will get the idea. You can
 use an
 array of pitot tubes to survey the velocity distribution of the air flow
 coming
 out if your inclined. We always appreciate new data.

 Paul Lamar



Paul,
         so far so good, can you give me an idea as to the size opening of
the duct to the rad allowing that the rad is between 2 and 2.5 sq feet ??
Neil;


I would go for 30%. If it cools OK that you can try reducing it.

Here are some more pictures of cowl flaps.

Paul Lamar