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Tip Speed Definition and Formula

Tip Speed / Peripheral Speed

Blade Speed (tip speed), measures how far a point on the outer most edge of the disperser blade travels in a given amount of time. You may remember from early math classes that the circumference (perimeter) of a circle is equal to:

Circumference = Π × D

So if we take a 1 foot diameter (D) blade and turn it one complete revolution, a point on its edge would have travelled pi (Π) 3.14 feet.

By multiplying by rpm (n) we get the Tip Speed formula:

TipSpeed = Π × D × n

where:

Tip Speed - impeller tip speed (rpm)
D - impeller diameter (ft)
n - impeller rotation speed (fpm)

Blade speed for a high speed disperser is 5200 fpm (feet per minute).

Disperser manufacturers normally target between 4000 and 6000 fpm (feet per minute) for the tip speed of their dispersers. As with blade diameter, there are advantages to varying the tip speed of these dispersion blades. Higher tip speeds may produce superior grinds in difficult to disperse products or counter insufficient flow in high viscosity batches. Lower speeds will reduce the vortex in low viscosity batches.

From an operator's perspective, one blade may function adequately in several different diameter tanks, resulting in less operator intervention.

Our Tip Speed Calculator addresses the most common uses of the tip speed equation.

Tip Speed - calculating tip speed based on a know blade diameter and rpm.
RPM - calculating rpm needed to develop a desired tip speed with a know blade diameter.
Scale Up - Match the tip speed of one mixer to that of second disperser with differing blade sizes.

Tip Speed Calculator

Calculators for Tip Speed, RPM, and Scale-up

Tip Speed Calculator

Posted in: Mixing and Dispersion, Toolbox

Comments

Oil emulsions
By: Carl austin On 05/08/2025
Rating:
★★★★★ (5.0)

We mix 2000l of oil emulsion with fungicides upto 8k
Is th blade diameter the diameter of the tank or the actual blade one is 140 cm or. 12 cm can submit photos please advise DOLE FRUIT COMPANY

Replied by: Stephen Schmidt On 07/27/2025 If you wish to phone me. I would be happy to discuss your application
Best Products in India
By: Ceracin On 11/21/2023
Rating:
★★★★★ (5.0)

Thanks for sharing this amazing blog.
Tip speed calculation
By: Vijay kumar On 02/09/2023
Rating:
★★★★★ (5.0)

Tip speed = Pi*r*h
Pi = Area of circumference
r = radius
h = height of the RMG or Blender from bottom to top of till filling of materials

is it right.

Replied by: Presta Admin On 02/09/2023 Tip speed is Pi * D *n

Pi = 3.14
D = Diameter of the blade
n = rotational speed of the shaft.

It does not vary with height, with material level.