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Horse Power Into Newton  
User currently offlineTOP From Germany, joined May 2000, 264 posts, RR: 0
Posted (14 years 6 months 1 day 16 hours ago) and read 12562 times:

Hello,
can anybody tell me which is the conversion of Horse Power in Newton?

Thank you,
Stephan


Duisburg,
GERMANY

11 replies: All unread, jump to last
 
User currently offlinePanman From Trinidad and Tobago, joined Aug 1999, 790 posts, RR: 0
Reply 1, posted (14 years 6 months 1 day 14 hours ago) and read 12383 times:

I've got it written down in my Piston Engine notes at home. Expect a reply in about 3-4 hours from now

PANMAN


User currently offlineAaron atp From United States of America, joined Mar 2000, 533 posts, RR: 2
Reply 2, posted (14 years 6 months 1 day 14 hours ago) and read 12379 times:

Power = (force * distance) / time

1 HP is 746 Watts, which is 746 newton.meters per second


aaron


User currently offlineSabenapilot From Belgium, joined Feb 2000, 2724 posts, RR: 46
Reply 3, posted (14 years 5 months 3 weeks 6 days 17 hours ago) and read 12344 times:

Carefull, there are two kinds of horsepower:
English: 746 W
French: 735 W (or simething close to that....)


User currently offlineDnalor From Australia, joined Mar 2000, 369 posts, RR: 0
Reply 4, posted (14 years 5 months 3 weeks 6 days 15 hours ago) and read 12343 times:

isnt it BHP and DIN

then on dyno's there are two distinct methods of measuring horsepower/kilowatts and torque:

one is where the engine is accelerating thru its rev range constantly and measured consatntly hence the engine has an accelerated momentum, then the other is where the computer allows the engine to accelerate in 1000 RPM increments then holds the engine under load and measures the power.

Bit of useless information there for you to chew on


User currently offlineAaron atp From United States of America, joined Mar 2000, 533 posts, RR: 2
Reply 5, posted (14 years 5 months 3 weeks 6 days 13 hours ago) and read 12347 times:

BHP = (Brake Horsepower = SHP - system losses), a measurement of useful horsepower: "power at the prop" or "power at the wheels." 746 Watts

SHP = (Shaft Horsepower) mechanical power produced by the engine with no system losses factored in. 746 Watts

Kilowatt = Standard metric measurement of mechanical power, 1000 Watts

[not Din, but Dyne = outdated measurement of force instead of power, compare to the newton]

Notwithstanding, there are two types of HP
Metric HP = (75 Kg.m)/s = 735 watts
English HP = (550 lb.ft)/s = 746 watts
-properly defined as 33,000 lb.ft per minute, but 33000/60 = 550

the terminology is damning in of itself...


Dnalor is certainly right about the methods, but here is a more specific way to get brake horsepower/torque measurements to be done....

to measure BHP:
1.load the propulsion system (a car for instance) on the dyno so that 100% of the rated RPM is reached at full throttle
2. measure the torque in ft.lbs
3. increase the load to reduce RPM by 500 RPM (or any increment you choose
4. measure the torque in ft.lbs
5. go to (3) until you reach idle RPM

Torque Produced * (RPM / 5252) = BHP at that RPM

Then you can plot a Torque-RPM scale and a HP-RPM scale to get your respective curves.





aaron




User currently offlineTOP From Germany, joined May 2000, 264 posts, RR: 0
Reply 6, posted (14 years 5 months 3 weeks 6 days 12 hours ago) and read 12325 times:

Thank you!

Stephan


Duisburg,
GERMANY


User currently offlineBuff From Australia, joined Mar 2007, 0 posts, RR: 1
Reply 7, posted (14 years 5 months 3 weeks 5 days 3 hours ago) and read 12311 times:

One of you guys needs to give NASA a good heads up!!!

Best Regards,

Buff from Mars


User currently offlineSabenapilot From Belgium, joined Feb 2000, 2724 posts, RR: 46
Reply 8, posted (14 years 5 months 2 weeks 6 days 16 hours ago) and read 12293 times:

When are Americans finally going to quit calculations in:
°F,
ft,
NM,
HP,
lbf,
GAL,
lbs.
...
There is no relation between those units!
Use:
°C (or K),
m,
km,
N,
W,
l,
kg
The relations between them are obvious.



User currently offlineDnalor From Australia, joined Mar 2000, 369 posts, RR: 0
Reply 9, posted (14 years 5 months 2 weeks 6 days 6 hours ago) and read 12287 times:

Aaron, sorry mate I'd have to disagree, if anyone lugged a my car down thru the rev range under boost in 500 rpm incraments they'd be building me a new motor, especially if its a turboed engine. Great way to detonate a motor.

I have sat in on many dyno sessions and the load must only be held briefly UP thru the rev range to allow the motor/turbo some respsite, heat soak is always a major consideration while on a dyno, I have witnessed engine failures due to higher stress levels on the dyno than on the track or road  


User currently offlineAaron atp From United States of America, joined Mar 2000, 533 posts, RR: 2
Reply 10, posted (14 years 5 months 2 weeks 6 days 5 hours ago) and read 12283 times:

sounds good to me...

sorry for the inacurracy guys, just trying to show the relationship between horsepower and torque... I've never used a dyno, and just sort of hypothesized the process...



aaron


User currently offlineDnalor From Australia, joined Mar 2000, 369 posts, RR: 0
Reply 11, posted (14 years 5 months 2 weeks 5 days 18 hours ago) and read 12271 times:

Cheers Buff and Aaron

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