New Books on Engine cooling - read "Cooling for
Pushers"!

Posted by: "jimlopresti38" jimlopresti38@yahoo.com   jimlopresti38

Sun Jun 7, 2009 5:45 am (PDT)



New Design Text Books Are Now Available!

Learn all about Drag Reduction!

Hello! This is Jim LoPresti. I am the principle designer
behind all of

LoPresti Speed Merchants speed cowls, wing tips and wheel
pant mods.

I have been studying cooling drag and drag reduction full
time for more than 25
years. My father was a big believer in research and he
funded all my
flight testing.
I have logged over 100 cowl manometer flights, 25 prop wake
studies
and 24 induction
system surveys. I was granted the privilege of full time
study of the
results. All
thru my years as I would uncover some new pearl of wisdom I
would say "This
would make a great book someday!" Well, the day
finally came and I wrote my
first text; "Principles of Engine
Cooling". I got so excited
I sat down
and wrote five others! Did you know cooling drag can be a
full third of drag?
Reducing cooling drag delivers the biggest speed gain
possible of any other mod!
Speed gain from improved air induction is so potent that
its speed
gain cannot be
ignored!



Would you like to know cooling like I know cooling? You
can! Just read
my book and
all my gifts will be yours! Read "Principles of
Engine
Cooling". You want
15 solved examples with and without speed cowls? Read
"Cooling Drag ? Fleet
Summary"; all proven by flight test.

"Principles" is all about the tractor
configuration; I did not want to
leave all you pusher guys out in the cold so I wrote
"Cooling for
Pushers"
Which presents all the design differences of pushers and a
proven drag
definition.
You can cut your drag in half with two simple mods!

You say you want a speed cowl but you don't want to be
bothered with
math or a bunch
of analysis? There is hope for you too! Read
"Simplified Cooling
Analysis For
Homebuilders". No math required! Just read a few
carefully
designed graphs and
charts and end up with a cowl definition that will deliver
proven drag
reduction.

You might already have a speed cowl but you want to add a
high-performance Induction
System for some extra speed but don't know what to change
or how much speed to
expect from the mod. Just Read "RAM Air
Induction" and know
all you need
to know to maximize MAP and critical altitude. It's all
carefully documented and
ready for you.

There is also a book on Speed Testing. Want to measure
airspeed
changes like the big
boys? 25 pages, $30!



Book Synopses by Jim LoPresti



"Simplified Cooling Analysis for
Homebuilders"

A simple to use, graphical design procedure to allow
any-one to
quickly define inlet
and exit sizing which will deliver low drag for any popular
engine. No math is
required! All you have to do is pick design airspeed,
select from one of eight
popular engines and solve for areas. You can tailor climb
cooling to any desired
level; you can chose any exit speed you want but advise is
given as to
what works
the best for low-drag. The method ends up with a very
useful rule ?of-thumb that
can be used with confidence for any popular air-cooled
engine and can
be fine-tuned
to meet any desired specifications. The solution is
independent on
airspeed, solve
for one speed point and both climb and lean cruise will be
satisfied
by definition.
It is that easy! Includes a long discussion on cowl flaps,
why they
are needed and
how they reduce cooling drag. Many popular myths and
miss-conceptions
are debunked.
A great read! A must have! It just might be all you need
to

 know. 75 Pages, $65 list



"Principles of Engine Cooling"

A complete and though presentation on combustion waste
heat, Engine
Thermodynamics
and Aerodynamics with special focus on drag. All virgin
material never before in
print. The most comprehensive text available. All methods
proven with
flight test.

The chapter on waste heat shows the impact of all pertain
ate
variables on heat; the
most important being induction air temperature. Discover
the truth
about designing
for hot day conditions for minimum airflow.

The chapter on air-cooled thermodynamics presents a simple
yet
accurate method of
predicting flow rate, head and oil temperature for any
flight condition, power
setting or pressure drop. See the effect of oil cooler size
on engine temps.
Includes example calculations on 8 popular engines.

Does liquid-cooling offer any drag savings over air-cooled?
Read my chapter on
liquid cooled thermodynamics and find out. Learn the impact
of radiator core
geometry on thermal performance. Starts with the same 8 air
cooled
engines, cylinder
water jackets are sized and coolant pump speed is selected.
An
in-depth discussion
on radiator design and configuration with impact on drag.
Ends up with
a simple yet
accurate method of predicting head, oil and coolant
temperatures for any flight
condition, power setting or pressure drop. Size your own
custom radiator with
confidence!



The propeller has profound impact on engine cooling.
Slipstream energy
is different
for left, right or centerline. The chapter on propeller
effects
presents some very
simple yet accurate method of predicting these values using
a fundamental
relationship all the way down to stall speed! Slipstream
energy decays
rapidly as
the flow travels aft. The chapter presents easy methods for
predicting
energy levels
anywhere on the cowl surface. Static pressure right at the
prop disc and the
firewall can be predicted with assurance. You get methods
to predict
total pressure,
static pressure or velocity anywhere in the slipstream. You
cannot
accurately define
cooling flow if you do not know your boundary conditions.
The method
also presents a
simple yet accurate way to measure propeller efficiency in
flight using only the
airspeed gauge and a single total pressure measurement. It
really works!

The chapter on Inlets begins by dispelling major myths and
miss-conceptions that
abound in published documents. The truth behind inlet
behavior is
shown to follow
Bernoulli's equation. The concept of inlet loss is
presented along with measured
flight data. The correct equation defining diffuser tubes
and its
impact on design
is presented. This information has never been in print
before.

The Chapter on exits shows that they behave with zero loss.
All you need is exit
pressure drop and exhaust density to define accurate exit
speeds.
There is in-depth
discussion on cowl flaps and how they work.

The rubber meets the road in the chapter called
"Ideal Systems". This
chapter discusses how to tie everything together and run a
complete system. Both
direct and iterative solutions are presented and proven to
be
accurate. Discussions
of drag begin and the notion of "Cheek
Drag" is presented along with
"Jim's Law". This chapter is the meat of
the book and is a must read!

There is an in-depth chapter on Meredith Effect which
proves the
effect to be false;
indisputable results.

The Text ends with concluding remarks. 200 pages, I will
sell each
chapter for $50
or a complete bound book for $179



Principles Chapter List

Combustion Waste Heat

Air-Cooler Thermodynamics

Liquid-Cooled Thermodynamics

Propeller Effects

Ideal Inlets

Ideal Exits

Ideal Systems

Concluding Remarks

Meredith Effect

About The Author

"Cooling Drag ? Fleet Summary"

All the methods of "Principles" are put
to the test in" Fleet
Summary". Detailed drag analysis of 15 popular
airframes are discussed in
detail. There is special focus on cooling drag. Each model
includes
both the stock
and a special "Speed Cowl" Each and
everyone was actually
built and flight
tested. The methods of "Principles" are
proven accurate 15
times! Fleet
Summary is an invaluable collection of work and is a
treasure trove of
information
on the workings of production cowlings. Includes an
informative
summary chapter. 275
pages, $25 per airframe, Summary Chapter $50 or complete
bound book for $179



"Cooling for Pushers"

Does the pusher configuration offer any significant savings
in cooling
drag? Read
"cooling for Pushers" and find out!
Includes detailed drag
discussion on
five examples which show that every pusher is designed
around a flawed
philosophy.
The typical pusher cowl has significant moment losses,
terrible
recovery and very
high pressure drag. Making two simple changes can cut
cooling drag in
half! A LongEZ
will pick up 12 KTAS! It is a must read for any pusher
pilot! An Addendum to
"Principles" 75 pages, $65 list



"RAM Air Induction"

Increases in manifold pressure deliver more power and
airspeed! A simple yet
accurate method of gauging the performance level of your
present
system along with
simple fundamental method which shows the limit of
available power!
Includes methods
for predicting increases in both critical altitude and
airspeed. In
depth discussion
on how to maximize pressure recovery and reduce system
losses. The extra speed
cannot be ignored! This is a must read! 80 pages, $65
list.



Send check or money order (no credit cards please) to:

LoPresti Aero

5760 36th in

Vero Beach FL 32966

772/643-1879

JimLoPresti


And I thought SAE papers were expensive!!!!
I think I got all I need to know from Pauls' How to Cool Your Wankel.
C. Smith

I offered and Even Steven trade for my book :)

Paul Lamar