vps wrote:
((a^4+b^4)/2)^(1/4), where a = 100% x FTP is the power for the first hour and b = 50% x FTP the power in the second hour. --> NP=(1+0.5^4)^(1/4) x FTP=0.8537 x FTP
--> IF = NP/FTP = 0.8537
--> TSS = 0.8537² x 2 x 100 = 145.8
Can't be arsed to do the maths properly, but is it valid for you to take FTP outside the brackets in your first line, and where are you dividing by total duration for your NP calculator? I'm guessing you just forgot to type the /2 ?
I don't know how you are taking the 4th root of a number >1 and coming away with <1.
Shouldn't it read NP = ( ( (1xFTP)^4 + (0.5xFTP)^4 )/2 )^(1/4)
Can you still simply take FTP outside the brackets when you do this? For the same reason why RMS /= average in electronics.
But it's half past midnight so I could be off.
Rich.