Martians, pt 2 - Mars 18.jpg (1/1)

[Mitchell Holman[_3_]]

[Indrek Aaviso]

"Mitchell Holman" > wrote in message . 130...
It's interesting how the props are almost perfectly synchronised. Did that happen just by chance, or is there some kind of automatic synchronisation?

Cheers,

Indrek Aavisto

--
Criticism is easy; achievement is difficult W.S. Churchill

[Mitchell Holman[_3_]]

"Indrek Aaviso" > wrote in
:

> "Mitchell Holman" > wrote in message
> . 130...
> It's interesting how the props are almost perfectly synchronised. Did
> that happen just by chance, or is there some kind of automatic
> synchronisation?



Chance. Probably happens several times per second.

[John Szalay[_2_]]

Mitchell Holman > wrote in
. 130:

> "Indrek Aaviso" > wrote in
> :
>
>> "Mitchell Holman" > wrote in message
>> . 130...
>> It's interesting how the props are almost perfectly synchronised. Did
>> that happen just by chance, or is there some kind of automatic
>> synchronisation?
>
>
>
> Chance. Probably happens several times per second.
>

Perhaps not on turbo-props,
IIRC: doesn,t the C-130 & P3 have an auto-sync ?

Don,t know about radials..
I know when they are out of sync, its hard on the ears...damned annoying..

[Mitchell Holman[_3_]]

John Szalay <john.szalay.at.att.net> wrote in
42:

> Mitchell Holman > wrote in
> . 130:
>
>> "Indrek Aaviso" > wrote in
>> :
>>
>>> "Mitchell Holman" > wrote in message
>>> . 130...
>>> It's interesting how the props are almost perfectly synchronised.
>>> Did that happen just by chance, or is there some kind of automatic
>>> synchronisation?
>>
>>
>>
>> Chance. Probably happens several times per second.
>>
>
> Perhaps not on turbo-props,
> IIRC: doesn,t the C-130 & P3 have an auto-sync ?
>
> Don,t know about radials..


It happens with turbos, it happens with radials,
it happens with water-cooled pistons. Seems to a
universal thing.........

[Mike Mackenzie]

Mitchell Holman > wrote (in part):

>"Indrek Aaviso" > wrote in
:
>
>> "Mitchell Holman" > wrote in message
>> . 130...
>> It's interesting how the props are almost perfectly synchronised. Did
>> that happen just by chance, or is there some kind of automatic
>> synchronisation?
>
>
>
> Chance. Probably happens several times per second.

Most multi-engine prop aircraft have some form of auto-synch, which
just keeps the props at the same rpm as the "master" - normally
switched off during t'off and landing. Some, including C-130s and
even a Cessna 340A which I used to fly, have synchro-phasing. This
keeps the props in the same phase with each other in a pattern
designed to minimise prop noise inside the aircraft by ensuring
multiple pressure pulses from the props do not hit the fuselage skin
at the same time. That's the theory, anyway :-)

--
Mike Mackenzie (AVCOM Services)
Brisbane, AUSTRALIA
Remove "XYZ" from the "Reply to" address when responding by email.

[Indrek Aaviso]

"Mike Mackenzie" > wrote in message
...
> Mitchell Holman > wrote (in part):
>
>>"Indrek Aaviso" > wrote in
:
>>
>>> "Mitchell Holman" > wrote in message
>>> . 130...
>>> It's interesting how the props are almost perfectly synchronised. Did
>>> that happen just by chance, or is there some kind of automatic
>>> synchronisation?
>>
>>
>>
>> Chance. Probably happens several times per second.
>
> Most multi-engine prop aircraft have some form of auto-synch, which
> just keeps the props at the same rpm as the "master" - normally
> switched off during t'off and landing. Some, including C-130s and
> even a Cessna 340A which I used to fly, have synchro-phasing. This
> keeps the props in the same phase with each other in a pattern
> designed to minimise prop noise inside the aircraft by ensuring
> multiple pressure pulses from the props do not hit the fuselage skin
> at the same time. That's the theory, anyway :-)
>
> --
> Mike Mackenzie (AVCOM Services)
> Brisbane, AUSTRALIA
> Remove "XYZ" from the "Reply to" address when responding by email.


Thanks to everyone who replied.

Cheers,

Indrek Aavisto

--
Criticism is easy; achievement is difficult W.S. Churchill