Perfect prop blur (Ikarus C42B)

[Semmonka]

Well I was hoping to get perfect prop blur until the pilot turned engine off.
He was just demonstrating how easily it can be still controlled if engine fails.

http://www.vk-photography.net/images/1DMN2845.jpg

[PhotosGuy]

Good shot. ...until the pilot turned engine off. Good excuse! I don't think anyone else has used that one yet. :D

[Semmonka]

Good excuse!

Wooot? Dude, I aint kidding so no excuse here

[Cyclop]

Nice shot.

[RadAL]

the engine does look off... even if the shutter speed is very high... you can see faint traces of blur ;)

[Semmonka]

Engine looks off as it is off.
1/250 does not freeze prop that much. Its ultra light plane so it pretty much stays in the air like a feather. Wings has aluminium frame and just some fabric.
Its easy to see light coming trough the wings. Light plane with 100HP engine is not the easiest to flight on windy weather I think :D

[FlyingPhotog]

Any good reason as to why the pilot decided to do a dead stick demo?

[Semmonka]

Any good reason as to why the pilot decided to do a dead stick demo?

No idea. It happened during airshow and they just said it can land without any problem even if the engine is not running. I dont know anything about planes so there might be tons of planes that can do the same

[FlyingPhotog]

No idea. It happened during airshow and they just said it can land without any problem even if the engine is not running. I dont know anything about planes so there might be tons of planes that can do the same

Actually, they all can. Some just glide better than others.

[gkarris]

Shouldn't the prop have been windmilling?

[FlyingPhotog]

Shouldn't the prop have been windmilling?

Not necessarily. If you shut off the engine and slow the airspeed enough, you can have a case where there's not enough inertia to overcome a compression cycle and you can stop rotation entirely.

Also, it's probably a very lightweight composite prop so it won't have as much rotational mass and can reach the above state sooner.

[Semmonka]

Any idea of compression ratio of small engine like that?
I know it takes lot of power to rotate cars crank so its pretty hard to imagine that air will rotate crank at speeds that kind of plane can do

[gkarris]

Not necessarily. If you shut off the engine and slow the airspeed enough, you can have a case where there's not enough inertia to overcome a compression cycle and you can stop rotation entirely.

Also, it's probably a very lightweight composite prop so it won't have as much rotational mass and can reach the above state sooner.

Oh - okay. Used to a C172... ;)

[FlyingPhotog]

Oh - okay. Used to a C172... ;)

It can happen in a C172 as well (or so I'm told...) :shock: