Got out and tested some Spectra lines today, just flying, no matches. The results were pretty good. I used Power Pro 100 lb. test Hi-Vis yellow. Diameter is .45 mm(.0184 in.)$40 for 300 yards at the local shop, $3.50 a set for F2D. Melton Tackle has 1500 yards for $170, a little cheaper. Other dealers and other brands(the material all comes either from Honeywell or Dyneema) are cheaper.
I pull tested several short pieces. Just tied the ends with a loop and overhand knot. They consistently broke at 45 lb. Some at the knot, others a few inches away. Putting a sleeve of larger line over the part to be knotted should increase that a bunch, according to the experts. I'll give it a try. The single line strength is comfortably above the 33 lb(150 newtons) pull test. 80 lb(.42 mm) or 50 lb.(.38mm) test Spectra with sleeves on the knots should be usable too.
I also tested several pieces of 018 stainless line made using steel crimps. They broke slightly higher, 47-50 lb., always at a crimp.
The Spectra lines weigh 5.5 grams for a set. The stainless lines weigh 32 grams.
Flying was a non-event. I put them on a sport 15 plane for a dozen flights. No problems with mulitiple loops or speed. I tried them on an AKM ship. Speed was right where it usually is(way slow compared to the numbers I see). 23+ for ten laps. The plane flew much better, even though it had a bit too much tip weight with the light lines. Virtually no line whip even in the tightest maneuvers.
I like it. More later. I plane to try smaller lines with sleeving, and of course some good line tangles.