The motors I linked to are great in several aspects. The cabling is long so no extensions are required for most arm lengths. The prop adapter bolts on (much like the HobbyKing Prop Drive series) so there is no shaft to bend. They are low speed motors with very good bearings and tight tolerances.
The arms are not stronger but rather longer by 5 inches each allowing smoother flight (the closer together the motors are in a multi the more twitchy it is in flight) and bigger props. This is better for FPV and AP.
The solution for no counter rotating prop adapters is cheap and simple. Nylon insert Lock Nuts. They will not loosen in flight EVER! Most hardware stores have them.
Thurmond
Thanks! I understand what you say. I have considered most of these aspects, and these are my thoughts:
-I solder the bullets close to the motor, so no need for longer cables. I epoxy the root of the cables for durability.
-DT750's are quite low Kv (750).
-DT750's have quite noisy bearings, but they are really strong and efficient. Never heated up on me.
-DT750's mount is not the best. Neither is the long shaft. I agree with you on non-shaft motors being smarter.
-I could have built an H-quad
but I decided going for shorter arms for compactness and portability.
-Short arms can get me to some interesting places for FPV!
-Props will be 10x4.5 or 10x4.7 or 11x4.5 if I can fit them (I'll check that later)
Thanks for the nylon nut tip, I'll pick up some 4mm ones from HK when I order.