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Posted

Gentlemen, is around 80% of RPM what all the rest of you are getting on your engine power, or am I doing something wrong. I can't get my engine up to 100%. Is this how the sim. is written?

Posted

This is how the real engine works, and thus how your in-sim engine works. Have a look at the rest of the engine gauges.

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Posted
This is how the real engine works, and thus how your in-sim engine works. Have a look at the rest of the engine gauges.

 

Just checking, I know that the real A-10s max. speed is right at 450mph clean and on the sim. I can get around 370mph clean in level flight.

Posted
Just checking, I know that the real A-10s max. speed is right at 450mph clean and on the sim. I can get around 370mph clean in level flight.

 

I think you are reading the max speed of the aircraft rather than what the engines can push you along at. You might make 450 in a dive.

Posted

450kts, which are a little faster than mph.

 

The only way to achieve 450kts is to dive the aircraft; incidentally this is not the top speed, it is the never exceed speed. If you exceed this speed you will start having controllability issues.

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Posted
450kts, which are a little faster than mph.

 

The only way to achieve 450kts is to dive the aircraft; incidentally this is not the top speed, it is the never exceed speed. If you exceed this speed you will start having controllability issues.

 

Aight that's cool. I grew up in love with the Hog and had always read and seen docs. about it; they talked about it being 450, but they didn't specify dive, or max. speed, so that's how I got confused.

Posted

See if you can find the hog documents thread in this forum and grab yourself a copy of the -1 :) That is the basic operator's manual.

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Posted

Which RPM are you looking at? Core RPM is the one you should be looking at, not Fan.

To whom it may concern,

I am an idiot, unfortunately for the world, I have a internet connection and a fondness for beer....apologies for that.

Thank you for you patience.

 

 

Many people don't want the truth, they want constant reassurance that whatever misconception/fallacies they believe in are true..

Posted
Which RPM are you looking at? Core RPM is the one you should be looking at, not Fan.

 

We've been over this before, and this is still not correct for the A-10. Fan speed is what tells you the amount of thrust you have. The best indication for power varies from powerplant to powerplant and from aircraft installation to aircraft installation, and from the A-10A dash one I once again quote:

 

Therefore, engine fan speed is the best indication of thrust.

 

Go by the book, it is free to download and read.

 

Cheers,

Fred

Posted (edited)

I know we have, and I'm telling you every engine manual and aircraft that I have seen does not care about N1. Don't believe me, look it up. Research jet engine parameter, look at FAA handbooks you will see. Hell you can show me different and I can learn something, we all win right?

 

Edit

I will try to explain this again. There is not control of N1, only N2 (core) which feeds compress air to the combustion chamber. N1 will have the biggest variation and pilot has no control on those variations. N2 in the other hand, is more directly affected to throttle movement. N1 is only monitored for overspeed condition.

 

Please show me the error on my ways so I can learn something new. Hell I submit an AFTO form 22 and tell the USAF than they are all wrong and every jet manual has to be re-written.

Also, I do not need to down load that manual, I have access to the current one. Got to love ETIMS.

 

Edit :D sorry

I also think your misconstruing the point. I'm not contesting what produces the most power, I'm simply saying you can't control it nor will it relate adequately to the throttle position. So by using N2 rpm it is easier to relate to Full throttle forward

Edited by mvsgas

To whom it may concern,

I am an idiot, unfortunately for the world, I have a internet connection and a fondness for beer....apologies for that.

Thank you for you patience.

 

 

Many people don't want the truth, they want constant reassurance that whatever misconception/fallacies they believe in are true..

Posted
450kts, which are a little faster than mph.

 

Got that backwards. Mph is ~1.15 times knots.

 

Which RPM are you looking at? Core RPM is the one you should be looking at, not Fan.

 

Core speeds are faster, but as someone who's flown lots of turbine I've hardly ever used N2 as a reference. Use N1.

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Posted

To be fair, nearly all civilian commercial and military transport airplanes use N1 or EPR as the primary reference. However, fighter types use core speed and/or FTIT/ITT/EGT.

 

As Paul said, on the A-10, you use both. Fan Speed (N1) is the critical parameter for takeoff, but it's more common to set core speed, ITT, or even Fuel Flow when flying in tactical formation.

"They've got us surrounded again - those poor bastards!" - Lt. Col. Creighton Abrams

Posted
Nope.

 

1 statute/survey mile = ~1609 meters

1 nautical mile = 1852 meters

 

 

Yes. Exactly because a nautical mile is longer than a statue mile, 300knots is faster than 300mph.

 

 

Posted
To be fair, nearly all civilian commercial and military transport airplanes use N1 or EPR as the primary reference. However, fighter types use core speed and/or FTIT/ITT/EGT.

 

As Paul said, on the A-10, you use both. Fan Speed (N1) is the critical parameter for takeoff, but it's more common to set core speed, ITT, or even Fuel Flow when flying in tactical formation.

 

I think people would be amazed at the different answers you get when asking the same question to multiple pilots. Every reserve weekend if I have a different pilot I ask the same "canned" questions to see what kind of answer I get.

 

My favorite moment was from about 4 months ago. I was launching out our Group Commander who couldn't remember how to do a few things on teh CDU. I thought to myself, "good to know that it isn't just us flying the sim that can't remember all the CDU can do." A close second is when a pilot say's "chief, system such and such isn't working I'm calling a redball" Normally I'll jump up the ladder to take a quick look or if it's beyond my knowledge and specs or weapons show up and notice the system hasn't even been powered up...

Posted

I love those redball paul.

EPU is not powering util system/ not suppose to sir or My cabin pressure show 4000 feet/ well sir we are at 4000 above see level in this base, what is the problems?

Both happen in Holloman.

To whom it may concern,

I am an idiot, unfortunately for the world, I have a internet connection and a fondness for beer....apologies for that.

Thank you for you patience.

 

 

Many people don't want the truth, they want constant reassurance that whatever misconception/fallacies they believe in are true..

Posted

Ok so A-10 pilots used both, well thank Paul. There you go use which ever you prefer then. I stand corrected. Thank you for the info

To whom it may concern,

I am an idiot, unfortunately for the world, I have a internet connection and a fondness for beer....apologies for that.

Thank you for you patience.

 

 

Many people don't want the truth, they want constant reassurance that whatever misconception/fallacies they believe in are true..

Posted
Aight that's cool. I grew up in love with the Hog and had always read and seen docs. about it; they talked about it being 450, but they didn't specify dive, or max. speed, so that's how I got confused.

 

That's probably the TAS (true airspeed). If you're cruising along at, say, 20,000' doing IAS (indicated airspeed) of 320kt the aircraft will actually be doing 450-odd knots through the air. The difference between the two being the lower density air up at that altitude. IAS is good to know because that's what the wings (and engine) care about (extreme example being a shuttle in orbit, it's doing a TAS of 50 squillion knots, but an IAS of sweet F.A. as there's about one air particle up there.

Posted

No, it's IAS. Your Vne is 450kt or 0.75M, whichever comes first.

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Reminder: SAM = Speed Bump :D

I used to play flight sims like you, but then I took a slammer to the knee - Yoda

Posted

Ugh, its 8 in the morning, I just finished 6 hours in the sim, just got back to the hotel room I've been living in for 9 days now, and I'm actually about to debate V-speeds on an internet forum... I must be sick, right?

 

@GG, I think you mean Vmo, not Vne.

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Posted

... you must be sick ;)

 

Maybe you're right, I don't have my -1 handy. I was pretty sure it was Vne.

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Reminder: SAM = Speed Bump :D

I used to play flight sims like you, but then I took a slammer to the knee - Yoda

Posted
Nope.

 

1 statute/survey mile = ~1609 meters

1 nautical mile = 1852 meters

 

Nope. Mph is faster than knots, because of what you just said. ;)

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Posted (edited)

How so?

 

10 miles per hour = 16 km per hour

10 knots = 10 nautical miles per hour = 18,5 km per hour

 

That makes knots faster in my head :)

Edited by Mud
Edit: or also: 1 Knot = 1.15 MPH; 1 MPH = only 0.87 Knots.
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Posted (edited)

Exactly. For the same given speed your knots will read a lower number than mph (hence "knots is faster").

 

e.g. 300 knots = 345 mph

Edited by LawnDart

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