If the speed is crotchet=70 then there is no reason why the passages couldn't be played. I don't even see any of the string crossing as a problem. Looks good to go. These particular arpeggios aren't that difficult because many of them can be played without changing or crossing strings and as I said when the change is required I don't see any difficulties to be had.
Thanks for your reply - much appreciated. There is always the risk of writing something that is impossible to play if, even if your samples are up to the job !
Yes, slurred would be ok - as the melody should ring out on the first beat of each triplet group, the other notes are just the arpeggio of the supporting chord.
I've heard from 3 violinists now, and they all say it's not too hard - worth checking, anyway.
I now have to work out what's possible on a harp, as I want to include a harp part too.
Do you think that most semi-pro/ amateur orchestras have a harp player they can call on, or am I limiting the piece's playability ?
it is easily playable. Listen to the 1st violin part of the 4th movement of Schubert's "Great" C major symphony for a passage similar. One comment, you may wish to consider slurring each group of 3. That will make bowing less cumbersome.
Cheers, I have listened to that piece a few times, and will re-visit it now. You tend to forget just how fluently the violins can play fast scales and arpeggios and all stay in time (hopefully).
I'll let you know when I post my mock-up of the piece - it's a second movement of a planned symphony. Movement 1 can be found on my page.