Rotation Speed (Takeoff)
Estimate the rotation speed (Vr) at takeoff, Vr = factor · Vstall, multiplying the stall speed by the safety margin (typically ~1.1). Vr is the speed at which the pilot pulls back to raise the nose and start the takeoff; it ensures enough margin above the stall at the critical moment. Enter the stall speed and the safety factor.
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Velocidade de rotação (decolagem)
Na corrida de decolagem, há um instante preciso em que o piloto puxa o manche para levantar o nariz: a velocidade de rotação (Vr). Ela não pode ser cedo demais (a asa ainda não sustenta e o avião 'cai de volta' ou estola) nem tarde demais (gasta pista à toa). A regra prática é Vr = fator · Vstall, com o fator embutindo a margem de segurança acima do estol — tipicamente ~1,1, mas variando com peso, flapes e procedimento do fabricante. Em aviões grandes, Vr faz parte de um conjunto de velocidades V calculadas para cada decolagem (V1, Vr, V2). Informe a velocidade de estol e o fator de segurança.
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Machining Spindle Speed
Calculate the spindle speed (RPM) needed in machining, n = (1000·Vc) ÷ (π·D), from the desired cutting speed Vc (m/min) and the diameter D (mm — workpiece in turning or tool in milling). It is the inverse of the cutting-speed calculation, and the most used on the shop floor: the operator knows the material, picks the recommended cutting speed from tables, and must convert it to the rpm to set on the machine. The relation reveals a key point: for the same cutting speed, SMALLER-diameter parts or tools require HIGHER rpm (and vice versa). So turning a part of varying diameter (facing, tapers) at constant cutting speed requires continuously varying the rpm — done automatically by CNC lathes (G96, constant surface speed), while on conventional lathes the operator adjusts by ranges. Getting rpm right is essential for tool life, finish and safety (excessive rpm on large parts creates dangerous centrifugal forces). Enter the cutting speed and the diameter.
Stall Speed
Compute Vstall = √(2·m·g/(ρ·S·CLmax)).
The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.