Bell have said the BLR strakes cause cracks in 205 tailbooms
Bell are now coming up with a strake kit for the 205/212 tailbooms themselves.
Eurocopter had a strake on the B2 but the B3 doesnt have one.
its a bit like the aeroplane T-tail arguments.
If nothing else its a handy place to put yor tools when working on the driveshaft.