Can you do it? I will be using 4 Hitec HS 5485HBs and 1 JR DS821 and will require 3 24" extensions I have two standard ones and one HD one.
I will have a 6.0v 2400MAH rx pack. I think it will be ok they are not 250 oz monster servos. Just want to make sure. thanks

I think the servos will work fine on those extensions. The only time the small wire gauge will show its limits is during extreme demand on the servo. As long as you are not trying to 3D your plane, you will probably have no problems.

I hate buying the overpriced extensions myself and buy bulk HD servo wire instead. I cut and extend my servoleads, eliminating the extra connectors that also cause losses.