Troquemeter Calibration

[Swissmatt]

Mornin, I have a question that I seem unable to find an answer to in my textbooks.

 

Here it goes:

 

Torquemeters are usually calibrated in:

A) percent

BHp

C) SHp

D) some power unit per revolution

 

anybody know?

 

cheers,

+M

[Swissmatt]

I have a feeling it's percent.

[Hazy]

Usually percent.

 

You may find some in other units such as psi...etc.

 

H

[Bell Hell]

What aircraft, SM?

 

Even within the Bell mediums both % and PSI are used (212 and 204/5 respectively). Other types are sure to be different, so I wouldn't discount anything - different technologies allow for (or require) different solutions.

[212wrench]

or some are in percent but use PSI for calibration. 212 206

[Hazy]

Guys,

 

Look at the options he gave you. H

[skullcap]

Swissmatt;

 

Not sure what you mean by "what is it calibrated by" but the Astar torquemeter reads in transmissable torque in percent. It measures millivolts converted from engine oil bleed pressure.

 

So I guess they would calibrate the gauge by using millivolts which would equal the percent of torque required.

 

One reason the B or BA guage reads 83 or 88 percent as redline, is that 83% is the max torque the transmission can take out of the available 641 hp the engine can put out.

 

I would guess that most helicopters torquemeter reads a redline as max transmissable power(hp or kw) shown as either percent or oil pressure.

 

Hope it helps.

 

sc

[Hazy]

Swissmatt,

 

If this were a TC exam and you read to deeply into it when it says "usually" and put something other than percent, then you would be S-O-L. Guys, its a textbook question. H

[Swissmatt]

Guys, thanks a lot for the background info. Hazy, you're absolutely right, this is a textbook question. I'm doing my AME online course with ICS. Always interesting to hear 'more' to the story though so thanks for the input!

 

cheers,

+M