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Forum: Glow Engines

12-10-2010, 12:08 AM

Replies: 36

Unloaded rpm of glow engine?

Views: 4,226

Posted By DarZeelon

RE: Unloaded rpm of glow engine?

Lnewqban,

Just look at it this way; a prop with a 2/1 diameter-to-pitch ratio, would have its static AOA at the tips of the blades, at ~9.2Â°.

For a full-size plane's prop blades,...

Forum: Glow Engines

12-09-2010, 09:40 AM

Replies: 36

Unloaded rpm of glow engine?

Views: 4,226

Posted By DarZeelon

RE: Unloaded rpm of glow engine?

Greg,

I never wrote blade stalling does not occur; just that it is a transient condition.

If RPM is suddenly increased; the flow speed of the vortex does not immediately catch up.
As a...

Forum: Glow Engines

12-09-2010, 01:06 AM

Replies: 36

Unloaded rpm of glow engine?

Views: 4,226

Posted By DarZeelon

RE: Unloaded rpm of glow engine?

...Yet, no-one thinks the blades are stalled, despite their ~45Â° AOA near the root.
The vortex formed by any spinning prop/rotor prevents blade stalling.

Forum: Glow Engines

12-08-2010, 10:37 PM

Replies: 36

Unloaded rpm of glow engine?

Views: 4,226

Posted By DarZeelon

RE: Unloaded rpm of glow engine?

Barry,

I believe they are true...

If you hold a pylon racer for several seconds, the vortex will eventually build up and static RPM will stabilize, as will thrust.
When conditions are...

Forum: Glow Engines

12-08-2010, 12:26 AM

Replies: 36

Unloaded rpm of glow engine?

Views: 4,226

Posted By DarZeelon

RE: Unloaded rpm of glow engine?

Ed,

I am afraid the above is an incorrect statement.
'Stalled blades' is only a transitional condition.

Once a prop has been spinning at a constant RPM for more than a couple of...

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