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Forum: Glow Engines

12-10-2010, 06:18 PM

Replies: 36

Unloaded rpm of glow engine?

Views: 4,226

Posted By Lnewqban

RE: Unloaded rpm of glow engine?

Thank you guys; I stand corrected regarding APC props.
I have corrected the wrong statements of post #32.

I read that in the late Andy Lennon's book "Basics of RC model aircraft design" (page...

Forum: Glow Engines

12-10-2010, 03:23 AM

Replies: 36

Unloaded rpm of glow engine?

Views: 4,226

Posted By Lnewqban

RE: Unloaded rpm of glow engine?

Thank you very much, Dar.

I was reading about these props angles last night and I learned that APC propellers have around 4 degrees difference between the zero lift line and the flat back of the...

Forum: Glow Engines

12-09-2010, 06:58 PM

Replies: 36

Unloaded rpm of glow engine?

Views: 4,226

Posted By Lnewqban

RE: Unloaded rpm of glow engine?

Sport Pilot,

I believe that you refer to the upwash in front of the LE of the blade, which increases the effective AOA.

I just tried to explain graphically the reason for which the AOA of...

Forum: Glow Engines

12-09-2010, 11:02 AM

Replies: 36

Unloaded rpm of glow engine?

Views: 4,226

Posted By Lnewqban

RE: Unloaded rpm of glow engine?

ton2di,

The attached schematics complement Post #3 above.

The nomograph shows that, although both props reach similar static rpm's, the 15x8 will make the plane fly at 65 mph, while the...

Forum: Glow Engines

12-09-2010, 10:04 AM

Replies: 36

Unloaded rpm of glow engine?

Views: 4,226

Posted By Lnewqban

RE: Unloaded rpm of glow engine?

Really interesting staff, blw!!

As I understand it, the vortex ring creates a downwards flow that hits the blades from above, making the AOA negative at least on the area they hit the rotor's...

Forum: Glow Engines

12-07-2010, 05:54 PM

Replies: 36

Unloaded rpm of glow engine?

Views: 4,226

Posted By Lnewqban

RE: Unloaded rpm of glow engine?

When the airplane picks up some speed, the AOA of the blades of the propeller gets smaller (less drag and less pressure differential = less torque is demanded from the engine = more rpm)

These...

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