Stem length adjustment

[dax2]

I need to adjust stems manually so that they do not collide.
How can I do that?

In the example below stems grow longer when there are no beams (4rths)
however, LilyPond ignores stem-length when there are beams.

What can I do?



{
    \clef bass
    \override Stem  #'length = #10.0 %tweak 
    b,4           ais,     b,     g,
    b,8           ais,     b,     g,

}


-- 
dax2-tele2adsl:dk -- d-axel.dk/  Donald Axel

stemlenghts.png
Description: PNG image

stemcrash.png
Description: PNG image