I original had "further comprises turbine blades" in the specifications and claims now moving into an independent claim, is it ok to have "a turbine blades" or "a turbine blade(s)", there is more then one turbine blade, or how else can this be done without amendment to the specifications?
It seems you are worried about what is called 'antecedent' problem in claim construction. For which, you are inclined to use 'a + 'turbine blades'. When an element is mentioned first time in claim construction - 'said + element (turbine blades)' or 'the + elememt (turbine blades)', should not be used to avoid objection by examiner based on 'lack of antecedent'.
It would be fine if you just mention 'turbine blades'' in independent claim when mentioned first time and not grammatically incorrect 'a turbine blades'. For subsequent mentions about 'turbine blades', you should use 'the' or 'said' prefixed to 'turbine blades'.
Another point is, when number of blades is not specific, it is prudent to construct independent claim with 'at least one turbine blade' or ' one or more turbine blades'. Such phrase would give better protection against infringement.