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VMF513_Sandman
09-06-2004, 03:54 PM
i cant seem to tell any differnce having the magneto's manually turned on vs just the 'start n go' routine. some say they help

VMF513_Sandman
09-06-2004, 03:54 PM
i cant seem to tell any differnce having the magneto's manually turned on vs just the 'start n go' routine. some say they help

WUAF_Badsight
09-06-2004, 04:00 PM
thats because they are "ON" when you just "start n go"

if they were "off" when you spawned , your motor wouldnt start

.
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Korolov
09-06-2004, 04:18 PM
The only thing I notice about magnetos is that if you turn them off while the engine is running, you get a quick burst of immense torque.

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XyZspineZyX
09-06-2004, 05:14 PM
Does anybody know what magnetos actually do?

I've never had to deal with them in a sim besides switching them on or off. Really just another to-do in the preflight checklist.

But seriously, what do they do?

Atomic_Marten
09-06-2004, 05:24 PM
I think I have read somewhere that they have to do something with electricity. I have noticed different engine behaviour when I switch between magnetos 1, 1+2..

Hope too someone can explain this 'magneto' thing. http://ubbxforums.ubi.com/infopop/emoticons/icon_smile.gif

Arm_slinger
09-06-2004, 05:41 PM
They distribute the eletrical outputs to fire the engine

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VW-IceFire
09-06-2004, 07:36 PM
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by Arm_slinger:
They distribute the eletrical outputs to fire the engine

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<HR></BLOCKQUOTE>
Thats what I was going to say.

A little search on Google tells us what the Merlin engine magnetos do:
"Ignition is by two high-tension rotating magnet magnetos mounted on each side of the wheelcase. The "A" bank magneto serves the intake spark plugs and the "B" side magneto serves the exhaust spark plugs."

http://www.unlimitedexcitement.com/Pride%20of%20Pay%20n%20Pak/Rolls-Royce%20Merlin%20V-1650%20Engine.htm

So they seem to have the effect of starting the engine. I imagine your car engine has the same sort of thing...you turn the key and the magnetos create the spark that gets the engine rolling. I don't know much about engines to be honest so I'm attempting to extrapolate.

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ZG77_Lignite
09-06-2004, 07:39 PM
Like Armslinger said, I believe 'magnetos' are what produce electricity for the airplane, specifically for the spark plugs. Airplanes normally have 2 'magnetos' because they normally have 2 sparkplugs for every cylinder, operated as seperate systems. The redundancy not only decreases chance of total failure, it increases combustion efficiency in the cylinder (two sparks in different places, 'bigger' bang). It is possible to operate on only 1 magneto however combustion efficiency is decreased (you will see in many preflight checklists 'check magneto drop in RPM', FB shows a reasonably correct RPM drop for each aircraft when running only 1 magneto)

Their automobile counterpart is the alternator, however they operate somewhat differently; an alternator is specifically designed to charge a battery, a magneto is specifically designed to produce 'high voltage' electricity for spark plugs. However both can do the duties of the other, they are less efficient at the opposite job (aircraft often don't have or have poor/small quality batteries to save weight, and these batteries do not provide primary electric power like in a car; the FW190 might be an exception, its like a Cadila... errr BMW http://ubbxforums.ubi.com/infopop/emoticons/icon_smile.gif ).

BellHat
09-06-2004, 10:03 PM
A magneto is basically the same as an alternator in a car, but instead of moving the coil to make current, it moves the magnets.

http://science.howstuffworks.com/question375.htm

249th_Maico
09-06-2004, 11:04 PM
Forgive me for butting in. Is a magneto more like a distributor? The distributor on a car is turned by the camshaft. Electricity is Disitributed to each cylinder by a rotating device inside the distributor cap. The distributor cap has sparkplug wires that are connected right to the spark plugs.
I beleive that the Magnetos are doing the job of the distributor. The lights and must have thier own source of electricity... alternator? Batteries? Help me out here.
In the old days a set of points would contact at the time the fire was needed. Solid state technology ended all that in the early seventies. Then in 1981 the US cars became computer controlled. But I am way off subject now.
By the way Icefire, the 24 cylinders in the Tempest had dual plugs. This made finding a faulty plug or plugwire a real challenge. Can you imagine a 48 sparkplug change?

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EFG_Zeb
09-07-2004, 02:44 AM
Yes magnetos produce high voltage for the ignition system only, the distributor distributes this high voltage to the plugs in the firing order.
A magneto is not an alternator, it will not charge your battery nor will it run your electric/electronic accessories. Actually, the mags will be able to produce high voltage even if the alternator/generator is dead and the battery flat.
Aircraft have dual independent magnetos with 2 plugs per cylinder for redundancy.
Current for charging batteries and running the electric accessories is provided by a generator or an alternator (for cars). Aircraft batteries are usually of high quality (its aviation!), but optimised for weight saving.
In a car you will have an alternator and a magneto (or coil).

Regards,

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WOLFMondo
09-07-2004, 04:29 AM
http://www.patelisentertainment.ca/images/forsale/comics/marvel/magneto.jpg

heh...all those posts and it only needed 2 words, spark plugs http://ubbxforums.ubi.com/infopop/emoticons/icon_smile.gif

I noticed when you turn some off them off the engine power decreases. BTW, I think there is a description on mudmovers/airwarfare.com of magnetos.

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Willey
09-07-2004, 04:43 AM
Normally it should replace the I key... If there just was a bit of real engine management you'd first have to increase mixture, then set magnetos to Start and to Both afterwars.

Maple_Tiger
09-07-2004, 04:49 AM
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by Korolov:
The only thing I notice about magnetos is that if you turn them off while the engine is running, you get a quick burst of immense torque.

http://www.mechmodels.com/fbstuff/klv_sigp38shark1a.jpg <HR></BLOCKQUOTE>



I'll have to give that try.

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EFG_Zeb
09-07-2004, 05:44 AM
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by Willey:
Normally it should replace the I key... If there just was a bit of real engine management you'd first have to increase mixture, then set magnetos to Start and to Both afterwars.<HR></BLOCKQUOTE>

That would be for a Cessna...

For a typical warbird : Turn on fuel pump, set mixture rich, crack throttle open, energize starter (the "I" key), count 8 to 10 prop blades, then mags on both (with booster coil), when engine starts, be ready to fiddle with mixture and/or throttle until it smoothes out, off comes the booster coil; then check for oil pressure rise within 30 seconds... During all this, the pilot usually wishes he had a third hand... lol

Not sure if this procedure would work in game... But yes, it lacks a bit of real engine management at times... lol

"See, Decide, Attack, Reverse or Coffee Break" E.H.

k5054
09-07-2004, 06:41 AM
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR> By the way Icefire, the 24 cylinders in the Tempest had dual plugs. This made finding a faulty plug or plugwire a real challenge. Can you imagine a 48 sparkplug change?

<HR></BLOCKQUOTE>

In real life plugs are changed in complete sets, usually as the first action in the event of a misfire or mag drop (where the revs drop too much when you select 1 or 2 mag from both). you don't try to identify a bad plug, the whole removed set goes through the cleaning/bench test cycle.

The 48 plugs of the Sabre engine are at least on the outside of the engine.Some two row radials had real accessibilty problems and a plug change was a long job. Ever see a four-row 28 cyl R4360?

Kasdeya
09-07-2004, 12:26 PM
I have worked on Mags and they are distributers. Spark plug wires are routed into the Mag and attached to the Mag block. Each time the rotor hit the block each plug is fired off in order, just like a car's distributer. Aircraft have Alternators, and Magnetos, two seperate things. Old Stearmans that havent been fitted with electrics, just have Magnetos.

BTW, Don't open a mag up and touch the leads while you spin the spindle. *SHOCK* http://ubbxforums.ubi.com/infopop/emoticons/icon_wink.gif it will make you let go rather quickly.

Google Part No. SB9RU3 Its a Magneto for a P&W R1340 600 h.p. Radial.

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SlickStick
09-07-2004, 05:42 PM
Another example of magneto ignition would be older motorcycles. I believe most current motocrossers use a solid-state ignition system, but my 1978 YZ400E had a magneto ignition system.

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WB_Outlaw
09-07-2004, 08:22 PM
Just FYI, having both magnetos on will produce a miniscule bit more power due to both spark plugs firing and thus, better combustion. Switching from both mags to one will result in a small RPM drop. This is modeled in the game (or at least it was last time I checked). If the drop is more than 75 RPM you should shut down and report it to your crew chief who will tell you to get your **** back in the plane, quit being a coward, and go fight. He will replace the defective parts when you return.

I am in the group that would like to see a "VERY VERY VERY REALLY COOL Complex Engine Management" option that modeled everything from priming the engine for startup to oil dilution (only in cold weather of course) on shutdown. What we have now is totally uncool.

-Outlaw.