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| sent on September 21, 2019 (21:40) | This comment has been automatically translated (show/hide original)
.... So, a four hundredth of a second... The propeller sweeps a corner of about 60 degrees... I deduct a 4000 rpm. Did I guess Watson? :-) .... dunque, un quattrocentesimo di secondo... l'elica spazza un angolo di circa 60°... Deduco un 4000 rpm. Ho indovinato Watson?  |
| sent on September 21, 2019 (21:56) | This comment has been automatically translated (show/hide original)
Actually, as I read here, the Lycoming of 172 would develop 160 hp to 2,400 g/min.
https://it.wikipedia.org/wiki/Cessna_172.
But,
Here they say it would develop 180 hp at 2,700 rpm
https://it.wikipedia.org/wiki/Lycoming_O-360Don't trust Wikipedia...
Anyway I think it is difficult to decipher the engine regime nout from the photo, even though you know the time you shoot.
If you look closely, the propeller seems to have three blades, and these airplanes actually have two.
Complex optical effects come into play, of which I confess that I am not emanced.
Good evening and thank you for the ride.
Per la verità, a quanto leggo qui, il Lycoming del 172 svilupperebbe 160 hp a 2.400 g/min.
it.wikipedia.org/wiki/Cessna_172
Qui però dicono che svilupperebbe 180 hp a 2.700 giri
it.wikipedia.org/wiki/Lycoming_O-360
Vatti a fidare di Wikipedia...
Comunque penso che sia difficile decifrare il regime del motore dalla foto, pur sapendo il tempo di scatto.
Se guardi bene, in movimento sembra che l'elica abbia tre pale, mentre in realtà questi aeroplanini ne hanno due.
Entrano in ballo efffetti ottici complessi dei quali confesso di non essere edotto.
Buona serata e grazie del passaggio. |
| sent on September 21, 2019 (21:58) | This comment has been automatically translated (show/hide original)
Hole in the :-D water Buco nell'acqua  |
| sent on September 22, 2019 (15:41) | This comment has been automatically translated (show/hide original)
Thanks to your link www.aeroclubcomo.com/Menu2/Flotta/Cessna206/tabid/131/language/it-IT/D you understand that this plane is a tripal, so no optical mystery.
On my staggering calculation: given the margin of error arising from estimating by eye the angle swept by the shovel we can venture a 30% uncertainty (still ridiculous) and maybe we are not so insanely far from the 2750 rpm declared on the board Technique.
Faces aside... good reading :-)
Good Sunday for you :) Grazie al tuo link www.aeroclubcomo.com/Menu2/Flotta/Cessna206/tabid/131/language/it-IT/D si capisce che questo aereo è un tripala, quindi nessun mistero ottico.
In merito al mio calcolo balordo: visti i margini d'errore derivanti dallo stimare ad occhio l'angolo spazzato dalla pala da possiamo azzardare un' incertezza del 30% (comunque ridicola) e forse non siamo così follemente lontani dai 2750 rpm dichiarati sulla scheda tecnica.
Facezie a parte... ottima lettura
Buona domenica a te :) |
| sent on September 22, 2019 (16:01) | This comment has been automatically translated (show/hide original)
Yes, it's true, the Stationair is tripal, I didn't notice, but you can see it in this photo
https://www.juzaphoto.com/galleria.php?l=it&t=3318539
While the Skyhawk of blades has two
https://www.juzaphoto.com/galleria.php?t=3318578&l=it
Not not I had noticed the difference between the two Cessna.
To resent and good Sunday. Si, è vero, lo Stationair è tripala, non ci avevo fatto caso, ma lo si vede anche in questa foto
www.juzaphoto.com/galleria.php?l=it&t=3318539
Mentre lo Skyhawk di pale ne ha due
www.juzaphoto.com/galleria.php?t=3318578&l=it
Non avevo notato la differenza tra i due Cessna.
A risentirci e buona domenica. |
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