TOP
Topic Author
Posts: 250
Joined: Wed May 10, 2000 5:22 am

### Horse Power Into Newton

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

Thank you,
Stephan

Duisburg,
GERMANY

Panman
Posts: 603
Joined: Mon Aug 09, 1999 8:25 pm

### RE: Horse Power Into Newton

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

PANMAN

aaron atp
Posts: 517
Joined: Sun Mar 19, 2000 1:17 pm

### There Isn't

Power = (force * distance) / time

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

aaron

sabenapilot
Posts: 2450
Joined: Sat Feb 26, 2000 6:18 pm

### RE: There Isn't

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

dnalor
Posts: 346
Joined: Fri Mar 10, 2000 7:58 pm

### RE: Horse Power Into Newton

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

aaron atp
Posts: 517
Joined: Sun Mar 19, 2000 1:17 pm

### Measuring Power

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[not Din, but Dyne = outdated measurement of force instead of power, compare to the newton]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

TOP
Topic Author
Posts: 250
Joined: Wed May 10, 2000 5:22 am

### RE: Horse Power Into Newton

Thank you!

Stephan

Duisburg,
GERMANY

Buff
Posts: 1066
Joined: Fri Mar 16, 2007 1:29 pm

### RE: Mars Polar Orbiter Program Needs You!

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

Best Regards,

Buff from Mars

sabenapilot
Posts: 2450
Joined: Sat Feb 26, 2000 6:18 pm

### RE: Mars Polar Orbiter Program Needs You!

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.

dnalor
Posts: 346
Joined: Fri Mar 10, 2000 7:58 pm

### RE: Aaron Atp

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

aaron atp
Posts: 517
Joined: Sun Mar 19, 2000 1:17 pm

### ...

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

dnalor
Posts: 346
Joined: Fri Mar 10, 2000 7:58 pm

### RE: Horse Power Into Newton

Cheers Buff and Aaron

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