Merlin engine in Ace's

[SlapShot]

Also just like before start learning instead of stating complete bolder dash.

He is "learning on the run" ... he finds some little tid bit ... makes what he considers an intelligent post and then everybody else does the work educating him on why he is wrong ... he then picks up a little tid bit from that and the cycle continues.

What amazed me is that after all his various post, people still bite the lure and continue to try and educate the kid when he really doesn't want to learn ... he loves stirrin' the pot and all the attention he gets.

[SlapShot]

http://www.youtube.com/watch?v=EbVKWCpNFhY 

 

[Masherbrum]

LOL, that was exactly what I was thinking.  "It's one louder."

Wango Tango!!!!!

I miss both you and Slappy in the Arenas these days.   I hope the family is doing well for both of you.   

[Chalenge]

RPM lever does not change the pitch on the props , it only changes a preset on a governor.  The governor changes pitch via opening an oil valve to increase or decrease pitch to maintain a constant rpm.

The RPM will only vary from preset if the prop has hit mechanical stops at min or max pitch.

So if you dive a P-51 with RPM set to 3000 the pitch may go to a coarse setting in the dive and still maintain 3000? See my gut is telling me you would have to pull throttle and RPM back. IRL would engine management be very different from the way AH is or not?

[kvuo75]

So if you dive a P-51 with RPM set to 3000 the pitch may go to a coarse setting in the dive and still maintain 3000? See my gut is telling me you would have to pull throttle and RPM back. IRL would engine management be very different from the way AH is or not?

its exactly the same IRL. thats how constant speed props work.


heres a great article from a real world website explaining in more detail:

http://www.avweb.com/news/pelican/182082-1.html

[Sperky]

Also just like before start learning instead of stating complete bolder dash. And go get a refund on that "degree" of yours.

HiTech

Would that be the degree in Aerodumbnamics?   

[Lepape2]

Like many here have said, the RPM indicator will be mechanically linked to the engine, or somewhere in the gearbox or even an accessory for that matter; their amounts are proportionally dependent on each other. Its all about what numbers are engraved on the RPM instrument to indicate the RPM range that interests you the most. How do you care if the engine revs at 10,000,000RPM when all you need to know is prop RPM which maxes out at 5RPM? (Just an extreme example)

Looked at turbo prop engines? This one is "special". Instead of showing manifold pressure and RPM, it shows the turbine/compressor RPM on one instrument and another one indicates the prop RPM. The turbine RPM is shown in percentage of true RPM while the prop RPM is... ah crap, I just realized the prop in most cases is linked to a freewheeling turbine and does not spin at the same speed the turbine does. I will confuse our student to the point of auto destruction here. Forget it, I give up this is pointless.




By the way, at what school and what year did you get your degree in such a complex domain in which you seem to be lacking even the slightest amount of comprehension?
I'm not wasting brain cells on this tread anymore.

[Vinkman]

jamdive: why does it read RPM with the engine off? Its not reading engine RPMs.

The engine and the Propeller are mechanically linked through the reduction gear. As such they will always change speed together and in the proportion of the reduction ratio. There is no clutch or fluid coupling that disconnects them. So shutting off the engine will not instantly produce an engine RPM of zero, and as such this test is not proof of which speed is being read by the guage.  

[BulletVI]

Ok then close the thread

I was just what i thought was pointing out something that may be wrong but as usual nobody listens as your old dogs in here arnt willing to accept new players pointing out possible faults that need adjusting as far as im concerned you lot are just a bunch of ditty old men who don't like it when faults or possible faults are pointed out. You would all rather just Slander other people to protect your favourite toy. It seems that when an old dog points it out and posts with very little explanation you all jump so why don't you all just take a run and jump and wait for the next new player to bully and take the mikey of. As for i now couldnt care less if this game went tits up as i believe that in reality you are all a bunch of retards and fat old men with little willys who sit at a desk all day and do nothing but get fatter and wait around to needle some one.

Good Bye

[Masherbrum]

Ok then close the thread

I was just what i thought was pointing out something that may be wrong but as usual nobody listens as your old dogs in here arnt willing to accept new players pointing out possible faults that need adjusting as far as im concerned you lot are just a bunch of ditty old men who don't like it when faults or possible faults are pointed out. You would all rather just Slander other people to protect your favourite toy. It seems that when an old dog points it out and posts with very little explanation you all jump so why don't you all just take a run and jump and wait for the next new player to bully and take the mikey of. As for i now couldnt care less if this game went tits up as i believe that in reality you are all a bunch of retards and fat old men with little willys who sit at a desk all day and do nothing but get fatter and wait around to needle some one.

Good Bye

"Well.........bye"

[Chalenge]

its exactly the same IRL. thats how constant speed props work.

That cant be kvuo because I have read IRL in WWII pilots had to worry about props running away which we dont.

[dtango]

That cant be kvuo because I have read IRL in WWII pilots had to worry about props running away which we dont.

It does work like kvuo says in real life. 

Props running away (different from "overspeeding") are a result of a failure of the governor which causes the blade pitch to go flat (low pitch) while the engine is still running.  The low pitch results in low loading on the propeller which then lets the engine crankshaft spin like crazy because there's not very much loading from the propeller to resist the engine and more than likely leads to all sorts of nice bits of metal and stuff coming loose if you don't shutoff the engine .

Flakbait and I discussed this and some examples a couple of years ago:
http://bbs.hitechcreations.com/smf/index.php/topic,202353.msg2383945.html#msg2383945

[EDO43]

That cant be kvuo because I have read IRL in WWII pilots had to worry about props running away which we dont.

Props only run away when they drive the engine (and the engine is not operating) and not the other way around.  When the prop drives the engine (also known as negative torque), there's no governor imposed limit to the rpm it will reach so the engine tears itself apart when the prop causes the engine to exceed the rpm for which it is rated.  Also, there is no oil governing the prop and so it does whatever it wants to with respect to pitch, based on the type of prop you have.

[Chalenge]

Okay I guess. The reports I read made it sound as if steep dives pushed more air past the propeller forcing it to rev beyond limits and wreck the gearing. If the only thing to worry about is failed governors then I can see why its not in the game like that but if steep dives do in fact cause this sort of problem I would like to see that in the game just to make things a little bit tougher. 

[SlapShot]

Ok then close the thread

I was just what i thought was pointing out something that may be wrong but as usual nobody listens as your old dogs in here arnt willing to accept new players pointing out possible faults that need adjusting as far as im concerned you lot are just a bunch of ditty old men who don't like it when faults or possible faults are pointed out. You would all rather just Slander other people to protect your favourite toy. It seems that when an old dog points it out and posts with very little explanation you all jump so why don't you all just take a run and jump and wait for the next new player to bully and take the mikey of. As for i now couldnt care less if this game went tits up as i believe that in reality you are all a bunch of retards and fat old men with little willys who sit at a desk all day and do nothing but get fatter and wait around to needle some one.

Good Bye

It's not the fact that you "point" something out ... it's the way you point it out. You make a statement with minimal research and when people (who know what the hell they are talking about) point out the flaws in your statement, you refuse to believe them ... twist it in some other direction rather than say ... "geesh, your right, I didn't really didn't do all my homework on the subject ... thanks for enlightening me".

You say your an "Airframes Engineer" and with that we are all to stop in awe and not question you ? Personally, I doubt very strongly you are an "Airframes Engineer". Any "engineer" who would bring problem resolutions to the table in the manner in which you post on this BBS would not last very long in that profession. Your arguments are completely illogical, lacking in substance, and mostly emotional ... not the signs of a professional engineer.

Want to see how to correctly "point something out" and get results ? ... read this thread and most importantly, the very first post.

Baumer's ... "Gun sight image size analysis" ... http://bbs.hitechcreations.com/smf/index.php/topic,292017.0.html

This guy did all his homework before "pointing out" what he perceived to be a flaw. Presented it with practical examples along with the math/data to back it up. You could tell immediately that he did quite a bit of work and research before starting that thread. That immediately garnered him some respect ... regardless if he was right or wrong. So, with that, and some ongoing constructive discussions, HiTech acknowledged the error and guess what ... he fixed the problem almost immediately.

You want something changed ? ... then bring the "meat and potatoes" to the table.