flyrotary@lancaironline.net Mailing List Archive

Morning Jeff,

The pump inlet is the long tube feeding water into the center of the pump housing and the center of the empeller blades. So the blades are shaped to in a curve to "push" the water in the center of the empeller to the outside or the exit of the pump housing.. Yes, you would cup you hand to "scoop" up the water, but the pump does not "scoop" - it pushes. So at least that part of the Mazda pump design is correct.

From: Jeff Whaley

Sent: Friday, August 05, 2011 8:13 AM

To: Rotary motors in aircraft

Subject: [FlyRotary] Impellor Rotation Direction

Why do I get the feeling these impellors are being turned in the wrong direction?

Image 1 is a scan of a test engine … from my cockpit the prop turns clockwise and so does the e-shaft with an RD1-C - as referenced to this scanned image.

Now look at these water pump impellors … if I wanted to move water I’d cup my hand and scoop it, not use the back of my hand.

Has Mazda got this wrong? Or am I missing something?

It looks like I’ll have to change the water pump, as the flange may be warped and the thread bosses are definitely burred.

Jeff Whaley

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