Air exit vent with engine box?

The air extractor noise is a bit different to other sounds in flight, perhaps a quieter version of a gear door being open.

How strange. The vent should have nothing in common with an engine compartment.

Unfortunately, a casual attitude towards fuel in composite aircraft can end in tears. For example, ASH25M VH-GSI returned to Germany for a year and a half to get rebuilt.
After my friend's incident, I asked Rex Mayes to install a Safecraft extinguisher in my then ASH26E. It's likely the first fire extinguisher installed in SLSP and documented on the ASH26E Tech Pages, linked from the ASH26E/31Mi newsgroup.
There is a firewall, whether a good one or not. Definitely not if you drill holes in it.
Jim

On Tuesday, November 24, 2015 at 12:20:13 AM UTC-8, Tango Whisky wrote:

Is that not a firewall?

Why would an engine stowed away in the engine compartment catch fire?! And if it could, why is there no fire sensor installed? So no, it's not a fire wall.

Jim, can you explain what happened to your friends glider? (to learn from)

In my Ventus cT the "firewall" is no firewall at all by design, it will never help stopping or containing a fire for more than a very very short moment. By design the fuel drain line comes into to engine box where a valve can be opened (manually) to drain the system via a hole through the box.

I really can imagine things catching fire when retracting a hot engine into that box, that's why I'm curious about the incident.

Bert, a fuel line snagged when the prop was extended.
Fuel leaked into the engine compartment.
The extinguisher was in the car at the side of the runway.

Schleicher has since changed their fuel line material. Schempp might still be using lines that are not aviation grade. They are not aviation grade on my club's Duo XT. Don't know about others.

TW, your fuel lines likely go through the engine compartment. After a leak a retracted engine could cause a fire.
Jim

Am Mittwoch, 25. November 2015 06:55:20 UTC+1 schrieb JS:
Bert, a fuel line snagged when the prop was extended.
Fuel leaked into the engine compartment.
The extinguisher was in the car at the side of the runway.

Schleicher has since changed their fuel line material. Schempp might still be using lines that are not aviation grade. They are not aviation grade on my club's Duo XT. Don't know about others.

TW, your fuel lines likely go through the engine compartment. After a leak a retracted engine could cause a fire.
Jim

Jim,
the holes in my engine bay wall are covered with stainless steel mesh which would prevent flames leaking into the cockpit during the few minutes (seconds?)the engine bay wall hasn't burnt down (the expoxy burns quite well, and it's not even a sandwich structure), or the fire hasn't extended via the fuel lines which run underneath the seat pan.

And - if I specifically ask an engineer from Schempp-Hirth whether it's ok to drill these holes, and he tells me to go ahead, I tend to believe that he knows about the wall.

Cheers
Bert
(yes, TW's name is also Bert ;-))

Not a player in this debate, but curious just the same.

I'm trying to visualize where the fuel tank is that requires routing
fuel lines under the seat pan to get to the engine bay. The engine bay
is aft of the wing, isn't it? Where's the fuel carried?

On 11/25/2015 12:57 AM, Tango Whisky wrote:
Am Mittwoch, 25. November 2015 06:55:20 UTC+1 schrieb JS:
Bert, a fuel line snagged when the prop was extended.
Fuel leaked into the engine compartment.
The extinguisher was in the car at the side of the runway.

Schleicher has since changed their fuel line material. Schempp might still be using lines that are not aviation grade. They are not aviation grade on my club's Duo XT. Don't know about others.

TW, your fuel lines likely go through the engine compartment. After a leak a retracted engine could cause a fire.
Jim
Jim,
the holes in my engine bay wall are covered with stainless steel mesh which would prevent flames leaking into the cockpit during the few minutes (seconds?)the engine bay wall hasn't burnt down (the expoxy burns quite well, and it's not even a sandwich structure), or the fire hasn't extended via the fuel lines which run underneath the seat pan.

And - if I specifically ask an engineer from Schempp-Hirth whether it's ok to drill these holes, and he tells me to go ahead, I tend to believe that he knows about the wall.

Cheers
Bert
(yes, TW's name is also Bert ;-))

--
Dan, 5J

I'm trying to visualize where the fuel tank is that requires routing
fuel lines under the seat pan to get to the engine bay.* The engine
bay is aft of the wing, isn't it?* Where's the fuel carried?



I'm guessing the pilot wants a cut-off available; if you have multiple tanks (wing tanks), you also have to be able to switch tanks...

Am Mittwoch, 25. November 2015 16:33:41 UTC+1 schrieb Dan Daly:
I'm trying to visualize where the fuel tank is that requires routing
fuel lines under the seat pan to get to the engine bay.* The engine
bay is aft of the wing, isn't it?* Where's the fuel carried?

The electric fuel pump is seated under the seat pan, so the fuel gets routed there, and then through the shut-off underneath the wing spar connection on to the engine. The fuel tank is underneath the wing spar connection.

Now why exactly this pump is located under my left leg, I have strictly no idea. Maybe the intention is to have it at a relatively low spot with regard to the tank, and in this case there are no other spots left.

Bert
Ventus cM TW

Dan,
The electric fuel pump is under the seat, so fuel lines go from the tank to the pump under the seat and back to the engine
Dan

|On Wednesday, November 25, 2015 at 10:28:26 AM UTC-5, Dan Marotta wrote:
Not a player in this debate, but curious just the same.



I'm trying to visualize where the fuel tank is that requires routing
fuel lines under the seat pan to get to the engine bay.* The engine
bay is aft of the wing, isn't it?* Where's the fuel carried?




On 11/25/2015 12:57 AM, Tango Whisky
wrote:



Am Mittwoch, 25. November 2015 06:55:20 UTC+1 schrieb JS:


Bert, a fuel line snagged when the prop was extended.
Fuel leaked into the engine compartment.
The extinguisher was in the car at the side of the runway.

Schleicher has since changed their fuel line material. Schempp might still be using lines that are not aviation grade. They are not aviation grade on my club's Duo XT. Don't know about others.

TW, your fuel lines likely go through the engine compartment. After a leak a retracted engine could cause a fire.
Jim


Jim,
the holes in my engine bay wall are covered with stainless steel mesh which would prevent flames leaking into the cockpit during the few minutes (seconds?)the engine bay wall hasn't burnt down (the expoxy burns quite well, and it's not even a sandwich structure), or the fire hasn't extended via the fuel lines which run underneath the seat pan.

And - if I specifically ask an engineer from Schempp-Hirth whether it's ok to drill these holes, and he tells me to go ahead, I tend to believe that he knows about the wall.

Cheers
Bert
(yes, TW's name is also Bert ;-))





--

Dan, 5J

TW I'm glad you're aware of how quickly the composite structure gets compromised in a fire. Sounds like there isn't much of a firewall to start with.
These are not nice things to think about, but we're always practicing stuff in case of not nice things happening.

Realised I've owned three gliders with air extractor vents, the first was a Nimbus 3 with the exhaust at the bottom of the rudder. Because of the length of the resonating chamber the sound it produced had more low frequency component than the vents we see now in JS-, AS- etc. It's the change in low frequencies that I noticed with the extractors.
Jim

On Tuesday, November 24, 2015 at 11:58:01 PM UTC-8, Tango Whisky wrote:
Am Mittwoch, 25. November 2015 06:55:20 UTC+1 schrieb JS:
Bert, a fuel line snagged when the prop was extended.
Fuel leaked into the engine compartment.
The extinguisher was in the car at the side of the runway.

Schleicher has since changed their fuel line material. Schempp might still be using lines that are not aviation grade. They are not aviation grade on my club's Duo XT. Don't know about others.

TW, your fuel lines likely go through the engine compartment. After a leak a retracted engine could cause a fire.
Jim

Jim,
the holes in my engine bay wall are covered with stainless steel mesh which would prevent flames leaking into the cockpit during the few minutes (seconds?)the engine bay wall hasn't burnt down (the expoxy burns quite well, and it's not even a sandwich structure), or the fire hasn't extended via the fuel lines which run underneath the seat pan.

And - if I specifically ask an engineer from Schempp-Hirth whether it's ok to drill these holes, and he tells me to go ahead, I tend to believe that he knows about the wall.

Cheers
Bert
(yes, TW's name is also Bert ;-))

Jim, I don't see your point. My engine is operated on a mast.