I'll Take Fuels For 100 Alex!!

[dueguard1]

Can Someone tell what is an NACA scope is on the CRJ200? and does it do?
.....

Also just how many fuel pumps does the 200 have?
Tell me if I'm missing any?

2Engine Driven
2 Boost Pumps
3 Jet Pumps

 

[Soverytired]

NACA scoop + garden hose + breath mint = Mesa Air Group fuel credit card.

 

[wmuflyguy]

It is a vent.

2 eletric boost pumps
1 Apu/x-flow pump
2 engine driven fuel pumps

2 primary ejectors "pumps"
2 scavenge ejectors "pumps"
2 transfer ejectors "pumps"


What the hell is a "jet pump"?

 

[Soverytired]

YOU WANT GOUGE? . . . I'LL GIVE YOU GOUGE!

http://www.crj2.com/

(This is a nice summary of a Mesa CRJ 200 gouge sheet that's been around for years. No guarantees or warranties implied)

 

[dueguard1]

It is a vent.

2 eletric boost pumps
1 Apu/x-flow pump
2 engine driven fuel pumps

2 primary ejectors "pumps"
2 scavenge ejectors "pumps"
2 transfer ejectors "pumps"


What the hell is a "jet pump"?

That's what the fella who authored the material on CR2.COM
labeled them.....oh by the way I did not know there were two of each ejector pump(jet pump) on the 200...Thanks.

 

[dueguard1]

One more question...What is the Fuel Flow path for the 200....is this correct?
Center Tank> Main Tank> Collector Tank> High Pressure Pump

 

[Soverytired]

It's not just a vent, BTW (I think). You know how when you turn a 2 liter bottle of soda upsidedown and it drains out in spurts?

Its because the difference in air pressure from the outside of the bottle and the inside of the bottle which is at lower pressure as the soda leaves the bottle. The flow of pop stops for a second, air rushes in to replace the space left by the displaced pop, then the flow continues.

Solution to the "glunk-glunk" flow of pop? Poke a hole in the top, and the air rushes in to replace the displaced pop from the top instead of the bottom. Smooth flow of pop now. That hole is your NACA vent.

It provides a positive air pressure to the displaced fuel leaving the tank. Plus, it's shaped to take in airflow at high pressure as you're flying along at 300kts, because you really don't want a "glunk glunk" fuel flow at FL300.

And it also will operate as a overflow vent for either thermal expansion (full tanks on a hot day) or a failure of the automatic fuel SOV's while refueling.

 

[XJWRENCH]

What the hell is a "jet pump"?

Also called motive flow, A nozzle shoots fuel into the narrow most part of a venturi, the resulting low pressure area in the venturi pulls the fuel surrounding and behind the nozzle. This using a a little pressure tapped off the EDP or boost to move a larger quantity. It would resemble something like an old venturi pitot tube. Sort of like when you squirt a water hose in a pool the high speed stream pulls the still water with it.

 

[asayankee]

The "blowout" valves toward the outer portion of the wings are the ones that will leak like a biatch if the high-level shutoff valves don't work. I had that happen the other week. Not a drop came out of the NACA vents, but it pored like hell out of the other ones!

 

[The_Russian]

Ice cannot adhere to a NACA vent. This makes it "ice resistant".

 

[The_Russian]

BTW.....motive flow rulz. Until I....I.....

I feel the need......to crossfeed!

 

[LowlyPropCapt]

NACA scoop + garden hose + breath mint = Mesa Air Group fuel credit card.

I don't care who you are... That is funny sh*t.

I award you 10 points, sir!

 

[wmuflyguy]

Also called motive flow, A nozzle shoots fuel into the narrow most part of a venturi, the resulting low pressure area in the venturi pulls the fuel surrounding and behind the nozzle. This using a a little pressure tapped off the EDP or boost to move a larger quantity. It would resemble something like an old venturi pitot tube. Sort of like when you squirt a water hose in a pool the high speed stream pulls the still water with it.

Ah, I never heard the term "Jet pump" I knew what a motive flow pump was

 

[indianboy7]

Ah, I never heard the term "Jet pump" I knew what a motive flow pump was

jet pump=motive flow pump=ejector pump

 

[Papa Woody]

NACA = National Association of Comair Airmen