flyrotary@lancaironline.net Mailing List Archive

The impeller blades are curved. I guess it matters. I am surprised we never talked about this issue before. (that I know of). I guess Ed knew about it. Dave Leonard > So if you put a 2nd gen pump on a 3d gen engine it pumps > backwards? ;-)) I guess if the impeller blades run straight > radially it wouldn't matter. > But if they don't? .... > Jim Sower ... Destiny's Plaything > Crossville, TN; Chapter 5 > Long-EZ N83RT, Velocity N4095T > > > Ed Anderson wrote: > > > > > > > ----- Original Message ----- > > From: daveleonard@cox.net > > To: Rotary motors in aircraft > > Sent: Sunday, January 25, 2004 4:20 PM > > Subject: [FlyRotary] Re: Alternator belt path > > > > > > > > That is interesting. Please tell me that the > > rotation for the water pump for the 3rd generation > > is oppisite that for the second generation. I am > > using a simple belt scheme (everything turning the > > same direction). But in your drawing the water pump > > is turning in the oppisite direction. Yet I don't > > remember ever discussing that the pump rotation > > direction was different on the 3rd generation > > engines. > > > > Dave Leonard Dave, The rotation for the water pump > > on the 3rd generation IS opposite that for a second > > generation or the first generation for that matter. > > Given the geometry of the layout and belt angles, it > > looks like they had to run it off the "back" of the > > serpentine belt. Ed Anderson > > > > > > >

So if you put a 2nd gen pump on a 3d gen engine it pumps backwards? ;-)) I guess if the impeller blades run straight radially it wouldn't matter.
But if they don't? ....
Jim Sower ... Destiny's Plaything
Crossville, TN; Chapter 5
Long-EZ N83RT, Velocity N4095T

Ed Anderson wrote:

----- Original Message -----

From: daveleonard@cox.net

To: Rotary motors in aircraft

Sent: Sunday, January 25, 2004 4:20 PM

Subject: [FlyRotary] Re: Alternator belt path

That is interesting. Please tell me that the rotation for the water pump for the 3rd generation is oppisite that for the second generation. I am using a simple belt scheme (everything turning the same direction). But in your drawing the water pump is turning in the oppisite direction. Yet I don't remember ever discussing that the pump rotation direction was different on the 3rd generation engines.
Dave Leonard Dave, The rotation for the water pump on the 3rd generation IS opposite that for a second generation or the first generation for that matter. Given the geometry of the layout and belt angles, it looks like they had to run it off the "back" of the serpentine belt. Ed Anderson