Basic object information
Object name: M 51
Popular name: Whirlpool
Galaxy Object type: Galaxy
Magnitude: 8.1
Size: 11.2'x6.9'
Position angle: 7
Object classification: Sbc
Description: !!!,Great spiral nebula
Notes: Whirlpool Gal;interacting pair;classic spiral

Catalog information
RA (J2000.0): 13h 29m 54.0s
Dec (J2000.0): +47 12' 00"

Constellation: Canes Venatici

Observer: Iiro Sairanen
Obs. place: NOT (2390 m), La Palma, Spain
Date/Time: 28/29.3.2008 0:00

Telescope: Newton 110/805 mm

Magn: 115x

Filter:

Field: 43'

NE Lim.mag: 7.2

Background sky: 1

Seeing: 3

Height: -
Visuality: III
Weather: +4C, huminidy 40%, wind 10 m/s

This is only a test how Messier 51 appears in ideal conditions at 11 cm Newton. As you can see, the spiral arms are obvious but they are still pretty faint. I think that you can see same details with 15-20 cm telescope in typical Finnish skies.