I am using a 8911 on the rudder of my H9 Sukhoi and I am running A123 equivalents with no problems. As for the DS8425 according to this website [link=http://www.nitrodude.com.au/catalog/product_info.php?products_id=752]http://www.nitrodude.com.au/catalog/product_info.php?products_id=752[/link] they are rated for 6V so there should be no problem. I personally think that running the 8911 on ailerons is a bit of a overkill and if the quoted figures are correct for the DS8425 I would use them on the ailerons too. The only place that the 8911 "might" be necessary is for the rudder and even then it would not be used to its full potential. (I am running HiTec 5985 on elevators and ailerons and a HiTec 5955 on the rudder)

Cheers
Pupmeister

PS for the Americans on this thread the JR8911 is the equivalent to the 8711, unfortunately I do not know what the DS8425 equivalent is.