Question

$\text{The maximum total primary force in a three cylinder radial engine with axes}{120}^{\circ }\text{to one another, stroke length 100 mm, speed 3000 rpm, 1.5 kg of reciprocating mass/cylinder is}$

• A. 100 kN
• B. 12.05 kN
• C. 11.1 kN
• D. 15.2 kN

Answer 1

The correct option is C 11.1 kN


$2r=100\text{mm}$
$N=3000\text{rpm}$
$m=1.5$

$\text{Net primary force}=3\times \frac{m}{2}r{\omega }^2=11.1\text{kN}$