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I´m about to bend the H-tail feather spars to my plans built 750. The manual gives me a dl for the stabilzer front spar blank of 141mm while the flanges are 20mm and web 107mm. As I suspected the dimmentions didn´t add up when I ran a test piece. I ended up 3 mm short on the web after compensating 1mm for each of the flanges. The next time I tried, I had the web + flanges -2mm compensation for the bend radii (107+(2x20)-2=145 dl) now I am 1mm on the plus side on the web. All I need to do now is reduce another mm and I´m good to go. But I can´t help but wonder if I'm missing something or if the developed length is wrong? Any thoughts? I´m no engineer so if I had to guess I´d go with the first option.