The official aviation quiz topic!

Andries · Post by **Andries** » 14 Apr 2005, 10:56

I'll give a small hint ...

It has something to do with fluids and low temperatures ...

Greetz,

Andries

Post by **luchtzak** » 18 Apr 2005, 10:15

Andries,

nobody got your answer correct, time to say what the answer was and ask a new one

Andries · Post by **Andries** » 19 Apr 2005, 21:18

The original design of the CFM56-3 had a spinner with a sharp top. But as this top was not heated, it was very sensitive to ice. Because of the sharp top, the air didn't have to bend much before getting into the engine. This caused raindrops to crash into the spinner and immediatly turn into ice.

When these lumbs of ice then broke off, the engine was usually damaged or a flame-out occured. This was very dangerous !

With the new spinner with round top, the air has to bend off much more with the result that the raindrops are (mostly) being diverted around the spinner and into the engine.

You might now wonder why all other CFM56 engines have a sharp spinner ... Well the answer is simple, they are heated and thus not that sensitive to ice ...

So allot of you were very close with your answers, but the keyword 'ice' hadn't been mentioned yet ...

New question :
What's the biggest difference bestween the Eurocopter AS365N2 and the AS365N3 ???

Greetz,

Andries

HorsePower · Post by **HorsePower** » 19 Apr 2005, 23:24

Andries wrote:This caused raindrops to crash into the spinner and immediatly turn into ice.

Hi Andries,

You are talking here about "surfusion", right?

Seb.

Advisor · Post by **Advisor** » 20 Apr 2005, 11:02

rotor · Post by **rotor** » 20 Apr 2005, 11:30

Too late again

The difference is indeed the more powerfull engine. But what is more important, they are beauties !

Andries · Post by **Andries** » 20 Apr 2005, 12:15

TBSC wrote:The main difference is the Turbomeca Ariel 2C engine, what is equipped with FADEC and has 18 % more power than the Ariel 1C2 engine of the AS365N2.

Correct ! Your turn TBSC !

HorsePower wrote:Andries wrote:
This caused raindrops to crash into the spinner and immediatly turn into ice.

Hi Andries,

You are talking here about "surfusion", right?

Seb.

Sorry Seb, I don't know the term 'surfusion'. The explanation I gave is the same explanation I got during my lessons Aviation Technology.

Greetz,

Andries

HorsePower · Post by **HorsePower** » 20 Apr 2005, 19:31

@Andries:
Surfusion (french):
Water drops go into the air intake. Imagine the temp is going bellow zero (-2°c) but the drop is still water, not ice! Then it touches the spinner, it frozes intantaneously due to the impact. This is "surfusion".

Regards

Seb.

(Sorry to pollute the quizz...

)

Andries · Post by **Andries** » 20 Apr 2005, 22:32

HorsePower wrote:@Andries:
Surfusion (french):
Water drops go into the air intake. Imagine the temp is going bellow zero (-2°c) but the drop is still water, not ice! Then it touches the spinner, it frozes intantaneously due to the impact. This is "surfusion".

Regards

Seb.

(Sorry to pollute the quizz... )

Indeed.
And because of the round spinner, the air flows in a different way and the drop of water doesn't crash onto the spinner ...

TBSC, we are waiting for the new question

Greetz,

Andries

rotor · Post by **rotor** » 22 Apr 2005, 10:16

HA-LPB

Airbus A320-200

http://www.planepictures.net/netsearch4 ... &stype=reg

rotor · Post by **rotor** » 22 Apr 2005, 14:14

Time for some other kind of question

No technical knowledge required, only some common sense.

In Sint-Truiden (St-Trond) a helicopter hovered a few times per day over a orchard of black cherry blossoms.

question: why ? ?

HorsePower · Post by **HorsePower** » 22 Apr 2005, 16:22

I haven't understand exactly your question, however I've learnt that copters are utilized sometimes to dry the vineyard.

Is it something related with drying?

Regards

Seb.

EDIT: It's easier with a dictionary

>So it has something to do with pollenization, right?!

rotor · Post by **rotor** » 23 Apr 2005, 11:57

Nice try anyway, close, but not correct.

Andries · Post by **Andries** » 23 Apr 2005, 12:03

spraying for pesticides ?

Greetz,

Andries

nwa757 · Post by **nwa757** » 23 Apr 2005, 17:23

If there is rain, the helicopter will fly over the orchards to blow the rain off of the cherries.

I hope this is the right answer.

rotor · Post by **rotor** » 23 Apr 2005, 20:04

No

Extra hint: Ground temperature was 0 to -2 C