In front, on top, and behind the oil cooler, all
 kind of look like laminar flow airfoils.

 Tony

 That is the early P51. Models after the war had
 K&W curves as did the B36.

 Paul Lamar


 Hi!

 Constructing low turbulence wind tunnel and measured air
 flow separation. I guarantee that in expansion part of
 presented channel there will be a fluid flow separation
 which will parially shadow cooler. Please, put turbulators
 inside surfaces at the start of air expansion area. It can
 be any kind of parts cca 1-2mm in diameter. Make this
 surface section rough.

 B.r.

 Viktor

 Faculty of Mechanical Engineering
 University of Ljubljana
 Slovenia

 This is no longer necessary. In fact it slows the flow into the duct.
 Viktor, IMHO you have been isolated through no fault of your own
 for the years 1945 to 1990 and missed some developments
 in Aerodynamics. Two major books were published in English
 by German scientist that have become classics. "Fluid Dynamic
 Drag" by S. Hoerner in 1965 and The "Aerodynamics of Propulsion"
 by Kuchemann and Weber in 1953. These men did applied research
 on flow inside diffusers. I republished some of this work
 in my book "How to Cool Your Wankel". Some of these books
 are available from time to time used on the internet but
 quite expensive.

 Aerodynamics of Propulsion By Kuchemann and Weber is
 near impossible to find.

 There is only one copy of Fluid Dynamic Drag by S. Hoerner
 in bad shape for $75 on Ebay. 9 days left to bid.

 Item number:    130358647707
 Item location:    Palm City, Florida, United States
 Ships to:    United States, Europe


 Do you plan on attending Aero in April at Friedrichshaven
 this year? If so I will put the books in my luggage and
 we can get together and discuss them when I get there.

 Pipistrel, made in your country. is doing very well selling
 light sport aircraft world wide. They had a large presence
 at Aero last year.


 PIPISTREL d.o.o. Ajdovsc(ina
 GORISKA CESTA 50a
 SI-5270 AJDOVSC(INA
 SLOVENIA
 tel.: +386 5 36 63 873
 fax.: +386 5 36 61 263

 ----------------------------------------------------------------
 Have you seen this paper?

 http://protonet.org/doc/Liquid_cooling_5_LTR.pdf

 tonys longez

 ------------------------------------------------

 Yes. Good work.

 --------------------------------------------------

 On the whole it is good work but there is at least one
 error.

 The attached chart and the table do not correlate.
 a,b,c,d, etc.,etc.. are used to label the curves
 while numbers are used in the table.

 The curve labeled "a" in the lower graph is the K and W
 diffuser. The coordinates of which are in my book.

 Paul Lamar


 Hi!

 Read the paper. Exactly what I am talking about. Small surface curvature +
 high pressure
 gradient + unstable laminar boundary layer = separation. Sometimes helps
 tripping the
 laminar boundary layer with turbulator to turbulent boundary layer, which
 is more immune
 to separations. Separations are usually measured with hot-wire or lda/ldv
 but cheap
 visualization with smoke and strobe photography can help. On the picture
 red circles are
 recommended locations for turbulators and red curve is small correction to
 increase
 curvature radius and decrease probability of separation. Turbulators will
 increase drag by
 small amount but with shadows eliminations could increase cooling
 efficiency.

 Pipistrel (in Italian meaning flitter-mouse) is one of tree companies in
 Slovenia which
 produce general aviation airplanes. Their aircrafts are made from
 epoxy-fiberglass and
 carbon fiber. Aircrafts are made with sailplane philosophy in mind + small
 engine. Result:
 safe, light, laminar, long range, cheap (low drag - small engine) and low
 cost of
 ownership aircraft. Highly recommended.

 Kindly asking for help in drawing renesis 13b and 16x engines in 3D
 modeler software
 (Catia and SolidWorks). Need dimensions, locations of attaching points,
 intake and exhaust
 ports, and all data, which can improve quality of engines drawings. Even
 (planar)
 photographs can help. Accepting most of known graphic formats. Thank you
 very much.

 B.r.

 Viktor

 Slovenia

 Yes I read the paper professor :)
 That is obsolete thinking. K&W and K&L came up with something better
 after the war. That stuff is 70 years out of date. Where have you been? :)

 I have some 3D's of the Mazda rotary engines in igs zip file format that
 can be loaded into solid works. Can you receive zip files?

 Paul Lamar

Hello,

Paul if it's possible please send me some 3D's of the Mazda rotary engines
in igs zip file format that
can be loaded into solid works, maybe do You have some mazda engine parts
3D's?

Best Regards
Damian Jurczak

OK here is the basic block.

Paul Lamar