react, inducing rotation of the rotor. Pockets of pressurized air are received within compartments defined by adjacent vanes. Conventional rotary tools typically have a single exhaust port in the air motor for exhausting pressurized air from the motor. As each rotor compartment passes the exhaust port, much of the air within the compartment passes through the exhaust port and exits the motor. Any air remaining within the compartment after the compartment passes the exhaust port becomes trapped within the compartment. The volume of the compartment decreases as the compartment nears completion of a motor cycle, and the compartment must compress the air within the compartment for the rotor to continue to rotate. Compressing the air within the compartment (backpressure) reduces the rotational speed of the turning rotor. BackpressureIs President Donald Trump unwelcome at Sen. John McCain's funeral?

Dan Nowicki | The Republic | azcentral.com

"Intimates" of ailing U.S. Sen. John McCain have told the White House that President Donald Trump is not invited to the six-term Arizona Republican's funeral, the New York Times reported Saturday.

McCain's "intimates" were not named by the Times, which also disclosed that the "current plan" for McCain's funeral is a service at National Cathedral in Washington, D.C., which they want Vice President Mike Pence to attend instead of Trump.

RELATED: Sen. John McCain: 'This is my last term'

McCain and Trump since 2015 have had a notoriously hostile relationship.

Trump once mocked McCain's record as a POW during the Vietnam War, saying McCain is "a war hero because he was captured" and that he liked "people