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Search: Posts Made By: blw
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Forum: Glow Engines
12-10-2010, 06:30 PM
Replies: 36
Views: 4,226
Posted By blw

RE: Unloaded rpm of glow engine?

The 75% point of measurement has been the standard for a long time for stating the pitch.

The pressure differential for rotors is 1 to 2 percent. I would assume about the same for props.
Forum: Glow Engines
12-10-2010, 07:44 AM
Replies: 36
Views: 4,226
Posted By blw

RE: Unloaded rpm of glow engine?

I think the upwash is only called the disturbed air of the relative wind.

The downwash in your diagram is a small factor. You have a downwash angle and then the 'mean deflection of airflow'....
Forum: Glow Engines
12-09-2010, 07:40 AM
Replies: 36
Views: 4,226
Posted By blw

RE: Unloaded rpm of glow engine?

The 70% approximation would be the inner, driving, and driven regions. The driving region would be that 75%. The other 2 regions are mostly too much drag and/or stalled.



You have 3 or 4...
Forum: Glow Engines
12-08-2010, 03:14 PM
Replies: 36
Views: 4,226
Posted By blw

RE: Unloaded rpm of glow engine?

These statements aren't always true, Dar.

You can stall a coarse pitch on takeoff, especially with racing planes. It used to happen when racing first came about. I'm referring to total lift, or...
Forum: Glow Engines
12-08-2010, 07:31 AM
Replies: 36
Views: 4,226
Posted By blw

RE: Unloaded rpm of glow engine?

I'll go out on a limb since my references are still packed up and say that there is stalling at the hub area. This is a high drag region and a spinner can give around 5% drag reduction.

These...
Forum: Glow Engines
12-07-2010, 06:04 PM
Replies: 36
Views: 4,226
Posted By blw

RE: Unloaded rpm of glow engine?

Yes, props have a lower rpm on the ground. They all 'unload' in the air, but that is a misleading term. It would be more accurate to look at it as them having extra velocity and efficiency. The prop...
Showing results 1 to 6 of 6


 
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