I was unaware that Pratt & Whitney also toyed with the turbo
compound in addition to Allison and Curtiss Wright. Unfortunately
a lot of this data remained secret for far too long.
The Wright Turbo Compound was never secret and was used in at least one
commercial airplane, which I believe was the Boeing Stratocruiser. It is
well documented in the contemporary technical literature.
See e.g.: Wiegand, F.J. and W. R. Eichberg: Development of the Turbo
Compound Engine. SAE Transactions, Vol. 62 (1954) pp 265-279.
Marc de Piolenc
Compound and Free-Piston Engine Nut - certified
I am very well aware of the CW R3350TC Marc :) I was referring to the Allison
and Pratt & Whitney versions which were strictly military. Here are a couple of
shots from NACA reports 786, 822 and a list of NACA papers from that era.
The Strato Cruiser was powered by the P&W R4360.
Paul Lamar
The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/
Copyright 1998-2004 All world wide rights reserved.
NACA did a lot of applied research during WW II
on piston engines, cooling drag and props that is pertinent to our use.
Unfortunately it is not well organized and difficult to search
for subjects of interest. The reason is the title nomenclature was
not standardized and turbo compound engines could be called
anything from blow down turbines to compound engines in the
titles of the tech papers. Also unfortunately you cannot search
the internal parts of the pdf's by key words of interest
on the NACA web site.
I spent some time going through the entire list from 1940 through
about 1948 when all of this kind of research stopped. From then
on it was all turbines and jet airplanes.
I down loaded all the pdf papers of interest which amounted
to about 100 meg of data in the form of pdf's and dozens of
papers. I then did a bit of data processing to build an index
of just those tech papers that should be of interest to us.
Here is a partial index with summaries. I will expand this
list when I have time.
Paul Lamar
The AirCraft Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/
Copyright 1998-2002 All world wide rights reserved.
117.Brevoort, M J Joyner, U TThe problem of cooling an air-cooled cylinder on a
n aircraft enginenaca-report-7191941
118.Stickle, George W Naiman, Irven Crigler, John LPressure available for cooli
ng with cowlingflapsnaca-report-7201941
124.Biermann, Arnold E Ellerbrock, Herman H , JrThe design of fins for air-cool
ed cylindersnaca-report-7261941
162.Robinson, Russell G Becker, John VHigh-speed tests of conventional radial-e
ngine cowlingsnaca-report-7451942
163.Silverstein, Abe Wilson, Herbert A , JrDrag and propulsive characteristics
of air-cooledengine-nacelle installations for large airplanenaca-report-7461942
302.Sanders, J C Wilsted, H D Mulcahy, B AOperating temperatures of a sodium-co
oled exhaust valveas measured by a thermocouplenaca-report-7541943
318.Johnston, J FordReview of flight tests of NACA C and D cowlings on the XP-4
2 airplanenaca-report-7711943
408.Goett, Harry J Delaney, Noel KEffect of tilt of the propeller axis on thelo
ngitudinal-stability characteristics of single-engine airplanesnaca-report-7741
44
409.Theodorsen, TheodoreThe theory of propellers I : determination of the circu
lation function andthe mass coefficient for dual-rotating propellersnaca-report
7751944
410.Theodorsen, TheodoreThe theory of propellers II : method for calculating th
e axialinterferencenaca-report-7761944
411.Theodorsen, TheodoreThe theory of propellers III : the slipstream contracti
on with numericalvalues for two-blade and four-blade propellersnaca-report-7771
44
411.Theodorsen, TheodoreThe theory of propellers III : the slipstream contracti
on with numericalvalues for two-blade and four-blade propellersnaca-report-7771
44
418.Reuter, J George Valerino, Michael FIntercooler cooling-air weight flow and
pressure drop forminimum drag lossnaca-report-7841944
420.Turner, L Richard Desmon, Leland GPerformance of blowdown turbine driven by
exhaust gas ofnine-cylinder radial enginenaca-report-7861944
475.Shames, Sidney JAir-consumption parameters for automatic mixture control of
aircraft enginesnaca-report-8041945
477.Benser, William A Moses, Jason JAn investigation of backflow phenomenon in
centrifugalcompressorsnaca-report-8061945
483.Bellman, Donald R Evvard, John CKnock-limited performance of several intern
al coolantsnaca-report-8121945
484.Sanders, J CCorrelation of exhaust-valve temperatures with engine operating
conditions andvalve designnaca-report-8131945
485.Perl, W Tucker, MA general representation for axial-flow fans and turbinesn
aca-report-814naca-report-8131945
489.Manganiello, Eugene J Bogatsky, DonaldAn experimental investigation of rect
angular exhaust-gasejectors applicable for engine coolingnaca-report-8181945
258.Ribner, Herbert SPropellers in yawnaca-report-820December 1943
752.Pinkel, Benjamin Manganiello, Eugene J Bernardo, EverettCylinder-temperatur
e correlation of asingle-cylinder liquid-cooled enginenaca-report-8531946
754.Miller, Cearcy DRelation between spark-ignition engine knock, detonation wa
ves, andautoignition as shown by high-speed photographynaca-report-8551946
760.Bullock, Robert O Wilcox, Ward W Moses, Jason JExperimental and theoretical
studies of surgingin continuous-flow compressorsnaca-report-8611946
1917.Crigler, John LApplication of Theodorsen's theory to propeller designnaca-
report-9241949
