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rijaeger(at)wausau.k12.wi
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 Posted: Sun Oct 17, 2010 3:16 pm Post subject: TBO |
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What is TBO for the M14?
Thanks!
| Quote: | >> Eric Wobschall <eric(at)buffaloskyline.com> 10/17/10 5:11 PM >>>
|
Actually, I sort of doubt the engine was seized. However, when the oil
runs out and CHT skyrockets, combustion is screwed up and numerous
things are likely to happen to make the engine lose power.
On Oct 17, 2010, at 2:35 PM, Bitterlich, Mark G CIV Det Cherry Point,
MALS-14 64E wrote:
| Quote: |
Point, MALS-14 64E" <mark.bitterlich(at)navy.mil>
I think the question was addressed more to WHY it was wind-milling
Eric. I think he meant "seized" instead of "ceased".
In any event, I believe the pilot said something like "the engine
just seized", etc. And honestly I am not sure if I heard that right
either and am too lazy to go back and listen to it again.  But,
I think the issue was since the engine ran out of oil, and seized,
why was the prop still wind milling?
It's a good question really and one I hope I never find out the
answer to it PERSONALLY. Maybe someone else can explain how the
engine:
1. Ran out of oil.
2. Stopped producing power.
3. Still managed to keep spinning from the wind load induced to the
prop?
If the reduction gearbox came apart, one would think the prop would
have spun a LOT faster. Which lends one to believe that the engine
stopped producing power from a lack of oil, which usually results in
bearings just coming apart and the engine seizing. Yet the prop
doesn't seem to show any signs of it suddenly stopping and then
start spinning again etc.
Maybe something like the cam drive broke?
Anyway, interesting question. I have no idea. Maybe someone else
can answer it.
Mark Bitterlich
________________________________
From: owner-yak-list-server(at)matronics.com on behalf of Eric Wobschall
Sent: Sun 10/17/2010 10:18 AM
To: yak-list(at)matronics.com
Subject: Re: Re: Engine failure in a Yak-50
>
Any time a propeller can turn, it can potentially windmill, especially
if the resistance is low.
As the airplane moves, the air flow creates pressure differentials in
the propeller blades, which are airfoils. This forces the blades to
move in the direction of the leading edge, thereby converting this
kinetic energy to torque acting on the propeller shaft.
On Oct 17, 2010, at 12:19 AM, Elmar Hegenauer wrote:
>
>
> Why does the propeller windmill on
> a ceased engine, sheared gearbox?
>
> Elmar
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tigeryak18t
Joined: 26 Sep 2009
Posts: 233
Location: PARIS FRANCE
|
| Posted: Sun Oct 17, 2010 9:45 pm Post subject: TBO |
|
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Generally speaking : 500h plus 10%
some generation of motor 700h plus 10%
I can't make the difference between both but for sure some on the list, will.
Didier Blouzard
+33 6 2424 3672
Le 18 oct. 2010 à 01:12, "Rico Jaeger" <rijaeger(at)wausau.k12.wi.us> a écrit :
| Quote: |
What is TBO for the M14?
Thanks!
>>> Eric Wobschall <eric(at)buffaloskyline.com> 10/17/10 5:11 PM >>>
Actually, I sort of doubt the engine was seized. However, when the oil
runs out and CHT skyrockets, combustion is screwed up and numerous
things are likely to happen to make the engine lose power.
On Oct 17, 2010, at 2:35 PM, Bitterlich, Mark G CIV Det Cherry Point,
MALS-14 64E wrote:
>
> Point, MALS-14 64E" <mark.bitterlich(at)navy.mil>
>
> I think the question was addressed more to WHY it was wind-milling
> Eric. I think he meant "seized" instead of "ceased".
>
> In any event, I believe the pilot said something like "the engine
> just seized", etc. And honestly I am not sure if I heard that right
> either and am too lazy to go back and listen to it again. But,
> I think the issue was since the engine ran out of oil, and seized,
> why was the prop still wind milling?
>
> It's a good question really and one I hope I never find out the
> answer to it PERSONALLY. Maybe someone else can explain how the
> engine:
>
> 1. Ran out of oil.
> 2. Stopped producing power.
> 3. Still managed to keep spinning from the wind load induced to the
> prop?
>
> If the reduction gearbox came apart, one would think the prop would
> have spun a LOT faster. Which lends one to believe that the engine
> stopped producing power from a lack of oil, which usually results in
> bearings just coming apart and the engine seizing. Yet the prop
> doesn't seem to show any signs of it suddenly stopping and then
> start spinning again etc.
>
> Maybe something like the cam drive broke?
>
> Anyway, interesting question. I have no idea. Maybe someone else
> can answer it.
>
> Mark Bitterlich
>
>
> ________________________________
>
> From: owner-yak-list-server(at)matronics.com on behalf of Eric Wobschall
> Sent: Sun 10/17/2010 10:18 AM
> To: yak-list(at)matronics.com
> Subject: Re: Re: Engine failure in a Yak-50
>
>
>
>
>>
>
> Any time a propeller can turn, it can potentially windmill, especially
> if the resistance is low.
>
> As the airplane moves, the air flow creates pressure differentials in
> the propeller blades, which are airfoils. This forces the blades to
> move in the direction of the leading edge, thereby converting this
> kinetic energy to torque acting on the propeller shaft.
>
>
>
> On Oct 17, 2010, at 12:19 AM, Elmar Hegenauer wrote:
>
>>
>>
>> Why does the propeller windmill on
>> a ceased engine, sheared gearbox?
>>
>> Elmar
>>
>>
>>
>>
>>
>>
>
>
>
>
>
>
>
>
>
>
>
>
|
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Didier Tiger YAK18T
Member of Commemorative Air Force
French Wing |
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