killairbus

A lot of thrust to get 30% PW

Recommended Posts

I just loaded a blue United PW 747 at D4 in KSFO and I noticed that it takes quite a lot more thrust to get to 30% N1, under standard conditions, for each engine when compared to GE and RR. Is this supposed to be how it actually operates? Because the Northwest jet needs the same amount of thrust as United to get moving

 

-Angelo Busato

Share this post


Link to post
Share on other sites
Help AVSIM continue to serve you!
Please donate today!

Your topic doesn't quite make sense. What do you mean that it takes more thrust? A higher EPR?

Share this post


Link to post
Share on other sites

Movement on the throttle levers, sorry, in the GE and RRs moving the levers to 3 is enough to get the plane moving but I have to put PWs at 4.5 to get 30% N1.

Share this post


Link to post
Share on other sites

Well they are different engines. That right there plays a huge role in your issue. It doesn't mean anything is broken.

On the jets I fly. one variant has completely different engines than the other and the behave in two totally different ways in terms of thrust lever angle

Share this post


Link to post
Share on other sites

Well it was odd seeing how out of the 3 engine options, 2 behave similarly in terms of throttle lever angle so I naturally thought the PW could've either had an issue or was more distinct than the other two than I thought. 

Share this post


Link to post
Share on other sites

Do you mean the throttles in the VC move but engine thrust doesn't respond until the levers get to a certain point? I've seen this myself but never really thought much of it.

Share this post


Link to post
Share on other sites

Yeah the N1 builds more slowly in the PW model and the throttles in the cockpit have to go past the usual position for 30% in the GE and RR. 

 

-Angelo

Share this post


Link to post
Share on other sites

This is correct behavior, and after a short time one gets used to it.  The Pratts also have slightly less thrust but drink less fuel.  I remember how much I struggled with the Pratts when I first started flying with them during beta but communications with the developers and the technical data convinced me that they got the simulation right.

  • Upvote 1

Share this post


Link to post
Share on other sites

Interesting. Can't say I've ever noticed this....but then again, I've ONLY flown the Pratt & Whitney variant of the Boeing 747-400 series.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now