[kgross]

My first suggestion to you, is if you are worried about the friction loss, rather than worry about a flex curve verses a normal 90 elbow. Just upsize the plumbing. If you think you need 3/4 inch plumbing, use 1 1/4 and then it really will not matter how many elbows you put on it, you will still get more flow than the straight 3/4 pipe.

Just to give you some solid examples of what I am talking about. Using the Head loss calculator here on RC. Take a gen x mak4 with 3/4 inch pipe, 4 feet horizontal 4 feet vertical and 3 elbows. aprox 890 gph, move to 1 1/4 pipe and use 9 elbows and you get 1028 gph.

What I use to size my pipe, up to 500 gph 1 inch 500 to 1000 1 1/4, 1000 to 1500 1 1/2 over 1500 use 2 inch. Then you can put as many elbows on it as you need without worrying about the head loss. Also when possible use thin wall pipe over schedual 80 because the size of the pipe determines the OD, and with a thinner wall you get a much larger ID so you get more flow.

Kim