Re: Tanto Practice - Is true Aikido effective for disarming?
the best training for knife fighting/disarmament is the Fillipino martial arts
most Aikido dojos are not going to have instructors who have ever fought with knives (even just sparring with wooden or dull blades) which is important for purposes of disarming
also, the stylistic aikido attacks are not what a knife attacker would use, i.e., Kali uses a 1-10 (pattern) using the centerline as the guide which is more realistic then a "yoko-menuchi", etc.
anyway all systems are artificial and enlightened, progressive Aikido instructors may be able to assist you in knife defense
check out the Dog Brothers videos, they are some cool dudes