Vowel Length in English

clear-cut – четкий
redundant – избыточный, лишний
diachronic

Is vowel length relevant in
present-day English?
The degrees of vowel length:
1. long [s: p: k: b:]
2. half-long [pi:k] [p:t]
3. short [pn] [pt]
[di:d – di:p]

The position of a vowel in a word:
1. an open syllable – the longest:
2. before sonorant – shorter, but long enough:
[si:n] [di:n] [ri:l] [:l]
3. before voiced consonants:
[di:d] [si:d]
4. before voiceless consonants:
[si:t] [st]
[p:]

A. Meyer [me]
substantiated – доказанный, подтвержденный
explicable – объяснимый

The traditional pairs of short
and long counterparts
i: -  : -  : -  u: -  : - 
i: - j arbitrary – произвольный
[:] – [æ]
[] – []
[] – []
u -   -  : - :

ample – достаточный, обильный
prolongation [prlŋ|gen]
constituent [knsttjunt] – составная часть
contiguity [kntgju:ti] – примыкание
checked – unchecked (free)
subject (adj.) [sbdkt] – подверженный

Is only vowel quality relevant?
pt – pi:t p - i:p
bi:d - bd si:d - sd
syllabication [slæbken]

A new tendency:
[læt - læd]
latter - ladder