Supercharger Confusion

[nrshida]

Have a little experience of turbochargers but ones that (mostly) stay on the ground. I understand the principals of supercharging but one thing confuses me. As I climb in my Ki-84 the power drops off, especially above 7k. As I hit something like 10,400 feet I get a sudden burst of climb rate which I'm infering matchies a bulge of power again. Since the atmosphere presumably thins at a constant rate, how come there's a bulge of power there, is it to do with coincidental gearing in the supercharger? Also WEP makes no difference at certain alts but this also appears to not be linear. What's going on? 

[FLOOB]

Is your ki84 restored to original specs or modified?

[nrshida]

Is your ki84 restored to original specs or modified?

Hush Floob, you'll invalidate my warranty 

[Greebo]

The Ki-84 had a two speed supercharger. At around 14,000 feet (or 12K on WEP) the second gear kicks in and spins the supercharger up to a higher RPM increasing the boost available to the engine. Below this alt the slower gear stops the engine over-boosting and blowing its gaskets.

[nrshida]

Oooooh, all this time I thought it was single speed. Thanks.

[APDrone]

LOL.. what timing..   just last night I was flying the Ki-84 and noticed the power fluctuations at around that altitude and was thinking.. WTF?

Thanks for the post!

[zack1234]

So it tricks the engine in to thinking its at a lower altitude?

Japanese planes were poo because they lost the war

[JOACH1M]

Many other planes in-game do the same thing, I always figured it was due to the two-speed superchargers that were widely used.

[NatCigg]

So it tricks the engine in to thinking its at a lower altitude?

Japanese planes were poo because they lost the war

The NIKI owns the F4U ! 

 

Ok, every one of you to the DA! 

[Delirium]

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Let's see how many of community understand that reference. 

[Drano]

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<raises hand>

Sent from my XT1585 using Tapatalk

[hitech]

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Let's see how many of community understand that reference. 

Star trek?

HiTech

[pipz]

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AW. Go BZ! 

[pipz]

So it tricks the engine in to thinking its at a lower altitude?

Yes it has the same air density at say 10k as it would at sea level because of the supercharger.

[guncrasher]

(High blower engages!)



Aw


Semp
Let's see how many of community understand that reference.