Science Forums Biology Forum Molecular Biology Forum Physics Chemistry Forum B52 bomber; converting thrust to horse power...?

 Physics Forum Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.

# B52 bomber; converting thrust to horse power...?

## B52 bomber; converting thrust to horse power...? - Physics Forum

### B52 bomber; converting thrust to horse power...? - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.

#1
06-01-2004, 12:47 AM
 **bg** Guest Posts: n/a
B52 bomber; converting thrust to horse power...?

There was an experimental aircraft developed by Germany in WW2, the Ju390
V2, which flew non-stop from Europe to US east coast and back again. It's
ceiling was in the low 20k.

It had six engines developing 1700 hp each, currently under discussion at
the moderated group soc.history.war.world-war-ii, subject 'German Bombers to
NYC'.

I want to compare the 390's power to the 17000 pounds thrust available from
each of the eight Pratt & Whitney engines TF33-P-3/103 turbofans on the B52.

How does this 17000 pounds translate to hp?

BTW, a most fascinating site for the B52, especially in the charts appearing
about 2/3 of the way down is
[Only registered users see links. ]

TIA.

-bg-
[Only registered users see links. ]

#2
06-01-2004, 02:48 PM
 DaveL Guest Posts: n/a
B52 bomber; converting thrust to horse power...?

There is no direct conversion between hp and thrust. These are two
different things. It basically depends on the efficiency of the propellers.
That would help determine how many pounds of thrust they would make.

Horse Power is the indication of how much power the engine makes. Pounds of
thrust is how much pushing force the engine imparts to the aircraft. As you
can see, the difference between the two is the propeller for the prop
engine.

DaveL

"**bg**" <[Only registered users see links. ]> wrote in message
news:JmQuc.632435\$oR5.519689@pd7tw3no...
to
from
B52.
appearing

#3
06-01-2004, 05:37 PM
 Mark Fergerson Guest Posts: n/a
B52 bomber; converting thrust to horse power...?

**bg** wrote:

<snippage>

Dimensional analysis. In what units (M,L,T etc) are the
two quantities expressed?

Remember that pounds of thrust is a force, and that you
have to take the drag (another force) on the aircraft into
account. (There are four forces operating on an aircraft;
lift vs. weight, and thrust vs. drag.)

The hp applied as thrust is only useful in telling you
how fast the aircraft will move at a constant velocity _if_
you know the drag (assuming lift and weight also balance).

Mark L. Fergerson

#4
06-03-2004, 06:41 AM
 wavelength Guest Posts: n/a
B52 bomber; converting thrust to horse power...?

news:JmQuc.632435\$oR5.519689@pd7tw3no...
to
from
B52.
appearing

Nevertheless the ' effective power ' can be calculated by knowing how heavy
the planes are and how fast they accelerate
although this takes into the opposing forces of drag.

Best

#5
06-03-2004, 11:07 PM
B52 bomber; converting thrust to horse power...?

"**bg**" <[Only registered users see links. ]> wrote in message
news:JmQuc.632435\$oR5.519689@pd7tw3no...

Wrong.

[Only registered users see links. ]

Only one Ju390 was ever completed and flown, (Prototype V1) in the bomber
configuration. A second was started but not completed. The designed range
was 9700 km in the Reconnaisance version, but that was ever actually
performed. Given a bomb payload, the Ju390 version 1 would never have
completed the Berlin-New York round trip. Given only one completed test
flight, the "service ceiling" was never established. It probably would have
been limited by Germany's available human factors technology - how high
could the *crew* stand to go and remain for 20-30 hours (without pressure
suits and with limited O2 availability)?

The revelation that Germany *was* working on a long-range heavy bomber that
*could* have reached NYC from Berlin caused a lot of sweaty American palms,
however:
[Only registered users see links. ]

Make that 1970 hp.

from
B52.

It doesn't. Apples aren't oranges. Horsepower is "power" - energy times
time. Thrust is force - energy per unit distance. Given a good hydraulic
jack I could generate 17000 pounds of thrust with my personal 1/4 horsepower
body. Just don't expect it *fast*.

Tom Davidson
Richmond, VA

#6
06-04-2004, 09:06 PM
 Gordon Guest Posts: n/a
B52 bomber; converting thrust to horse power...?

On Thu, 3 Jun 2004 19:07:32 -0400, "tadchem" [snip]
I think what he is talking about is this constant force from each
of 8 engines, sustained at some constant velocity and altitude
(cruising conditions). This would be force X distance/time, and
would equate to power. The choice of units could give an answer
in hp. 33,000 foot pounds per minute is one hp.

Or, stated differently, 33,000 pounds applied to an object, in
the direction of its velocity, and moving it at one foot per
minute is producing one hp.

One engine, producing 16,500 pounds of thrust and moving an
object 2 feet per minute would equate to one hp.

All 8 engines moving this object 2 feet per minute would produce
8 hp.

Now, increase the speed to 36,900 feet per minute (450 mph) and
you get 147,600 hp equivalent...unless I miss keyed my
calculator.
#7
06-05-2004, 08:23 PM
 The Boerg Guest Posts: n/a
B52 bomber; converting thrust to horse power...?

"**bg**" <[Only registered users see links. ]> wrote in message
news:JmQuc.632435

Thrust and power ratings are probably done at a standard altitude and
velocity. The two are not constant and depend on many variable. But the
instantaneous power of an engine is basically the thrust it produces
multiplied by the planes air speed.

17000 pounds at 300 mph would equate to 13,600 hp. I don't think they push
that hard, but that's an example.

 Tags b52 , bomber , converting , horse , power , thrust

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home General Science Forums     Biology Forum     New Member Introductions Forum     Chemistry Forum         Organic Chemistry Forum     Physics Forum     General Science Questions and Layperson Board         Science and Religion Forum         Zoology Forum     Environmental Sciences and Issues General Forum     Chit Chat         Science and Lab Jokes     Article Discussion     Molecular Biology News and Announcements         Conferences , Symposiums and Meetings         Molecular Station Suggestion Forum         Instructions for Posting, Help, and Frequently Asked Questions     Science News and Views         Molecular Biology Lectures and Videos     Science Careers         Post-doctoral         Medical School         Ph.D Doctor of Philosophy         Science Jobs Forum Molecular Research Topics Forum     PCR - Polymerase Chain Reaction Forum         Real-Time PCR and Quantitative PCR Forum     Bioinformatics         BioStatistics Forum     Molecular Biology Techniques         Molecular Cloning Forum         Electrophoretic Mobility Shift Assay Forum         Agarose Gel Electrophoresis Forum         BioPhysics Forum         Gene Therapy     Cell Biology and Cell Culture         Apoptosis, Autophagy, and Necrosis Forum         Flow Cytometry Forum         Transfection Forum         Confocal - Microscopy Imaging Techniques         Immunology and Host-Pathogen Interactions         Signalling Biology         Stem Cell Forum     Basic Lab Protocols and Techniques         SDS-PAGE Gel Electrophoresis Forum     DNA Techniques         DNA Extraction Forum         cDNA Forum     Epigenetics Forum: DNA Methylation, Histone and Chromatin Study         ChIP Chromatin Immunoprecipitation Forum     Protein Science         Antibody Forum             Immunoprecipitation Forum         Western Blot Forum         Protein Crystallography Forum         Recombinant Protein Forum         ELISA Assay Forum         Protein Forum     Proteomics Forum         Peptide Forum         Mass Spectrometry Forum         2-D Gel Electrophoresis Forum     Omics and Genomics Forum         Microarrays Forum         Genomics Forum     RNA Techniques Forum         RNAi and SiRNA Forum     Histology Forum         Immunohistochemistry Forum         Immunocytochemistry Forum         Electron Microscopy Forum         Immunofluorescence Forum     Protocols and Methods Forum     Molecular Biology Articles and Protocols     Animal and Molecular Model Systems         Drosophila Forum         Yeast Forum         Zebrafish Forum         Botany Forum         C Elegans Forum         Arabidopsis and Plant Biology         Microbiology Forum         Knockout Mouse Forum     Chromatography Forum Products and Vendor Discussion     Molecular Biology Products and Vendors         Bad Product/Service? Post Here         Lab Equipment Discussion and Reviews Regional Molecular Biology Discussion     Forum Chemie     Forum Biologie     Forum Biologia     Forum Chimica     Forum Physik     Forum De Chimie     Forum De Physique     Forum Chemia     中国人分子的生物学论坛 Chinese     Greek Molecular Biology Forums     分子生物学のフォーラム Japanese     ميدان فارسى. Persian Molecular Biology     [أربيك] علم ساحة- Arabic     Forum de Biologie Moleculaire     Forum Biologia Molecolare     Forum die Molekularbiologie     Foro Biologia Molecular

 Similar Threads Thread Thread Starter Forum Replies Last Post Peter Van Osta Cell Biology and Cell Culture 1 08-01-2010 02:18 PM Bjay Physics Forum 1 01-04-2004 01:17 AM Mike Darrett Chemistry Forum 169 08-02-2003 04:14 PM

All times are GMT. The time now is 08:24 PM.

 Contact Us - Molecular Biology - Archive - Privacy Statement - Top