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Forum: The Clubhouse

01-18-2003, 05:43 PM

Replies: 48

Good Bye

Views: 3,814

Posted By Ollie

Good Bye

Here is a partial quote from Marc's posting #161 to the AMA Discussion Forum under the What Does AMA Mean to you Thread.

"To the poster above who feels that it would be bad to tear something down...

Forum: RC Gliders, Sailplanes and Slope Soaring

01-16-2003, 07:11 AM

Replies: 4

Bye

Views: 745

Posted By Ollie

Bye

I will no longer be participating in this forum. I hope to encounter some of you elsewhere.

Forum: The Clubhouse

01-16-2003, 07:08 AM

Replies: 48

Good Bye

Views: 3,814

Posted By Ollie

Good Bye

I will no longer be participating in this forum.

Forum: RC Gliders, Sailplanes and Slope Soaring

01-16-2003, 03:43 AM

Replies: 33

Graupner Cirrus

Views: 20,975

Posted By Ollie

Graupner Cirrus

Michael,
It was 30 years ago. So, maybe I was wrong to credit Hiner with the solution rather than Graupner. On the other hand the wash out proceedure may have been added by Graupner to the...

Forum: Aerodynamics

01-16-2003, 03:24 AM

Replies: 120

Reynald's number

Views: 9,753

Posted By Ollie

Reynald's number

The flow over the top separates at the flap hinge line somewhere around five degrees of deflection, give or take a degree or two. By 40 degrees the flap is producing a lot of drag and the air flow...

Forum: Scratch Building, Aircraft Design, 3D/CAD

01-16-2003, 02:55 AM

Replies: 19

foam cutting - tougher than it looks!

Views: 1,905

Posted By Ollie

foam cutting - tougher than it looks!

I like the wire temperature so that the cut produces a maximum number of fine, hair like threads of melted foam. There is a slight drag on the wire at this temperature but it is not serious if you...

Forum: RC Gliders, Sailplanes and Slope Soaring

01-16-2003, 02:41 AM

Replies: 33

Graupner Cirrus

Views: 20,975

Posted By Ollie

Graupner Cirrus

A flying buddy of mine, Jack Hiner, had a Cumulus back in the 70's. He flew it extensively and did well with it. As I recall it had a tendency to tip stall because of the sweepback and no washout....

Forum: Aerodynamics

01-16-2003, 01:33 AM

Replies: 120

Reynald's number

Views: 9,753

Posted By Ollie

Reynald's number

Forum: Aerodynamics

01-16-2003, 12:00 AM

Replies: 4

Any recommendations for materials to learn aerodynamics

Views: 848

Posted By Ollie

Any recommendations for materials to learn aerodynamics

Model Aircraft Aerodynamics by Martin Simons is good reading. The heavier math is included in the Apendices rather than cluttering up the main text. The units used are metric rather than English...

Forum: Aerodynamics

01-15-2003, 10:58 PM

Replies: 120

Reynald's number

Views: 9,753

Posted By Ollie

Reynald's number

Bill,

There are many reynolds numbers associated with your B25. At a particular air speed the tip of the wing has a different reynolds number than the root of the wing. The engine nacelles have...

Forum: Aerodynamics

01-15-2003, 05:09 PM

Replies: 41

INDUCING flutter on a trainer

Views: 3,594

Posted By Ollie

INDUCING flutter on a trainer

Another measure that the other guys haven't mentioned is to add mass to the trailing edge of the rudder. Tape on a length of round solder wire with a little masking tape. If it is used with a sloppy...

Forum: Aerodynamics

01-14-2003, 09:41 PM

Replies: 120

Reynald's number

Views: 9,753

Posted By Ollie

Reynald's number

I'm taking two pages out of your excuse book, Dick. X Foil is not only an airfoil design program but a virtual wind tunnel that runs on your home PC. Its available as a free download too. No need any...

Forum: Aerodynamics

01-14-2003, 08:15 PM

Replies: 120

Reynald's number

Views: 9,753

Posted By Ollie

Reynald's number

Bee's wing don't produce lift by the same mechanism as aircraft wings. At the extremely low reynolds numbers of bee's wings the boundary layer is about the same thickness as the bee's wing is wide....

Forum: Aerodynamics

01-14-2003, 11:03 AM

Replies: 15

Delta plane airfoil

Views: 3,509

Posted By Ollie

Delta plane airfoil

Selcuk, See:
http://aero.stanford.edu/Reports/MultOp/multop.html

I think you would be much better off building the small scale glider to get the CG rather than try to do the calculations.

Forum: RC Gliders, Sailplanes and Slope Soaring

01-14-2003, 09:11 AM

Replies: 10

Flat land Dynamic Soaring?

Views: 2,890

Posted By Ollie

Flat land Dynamic Soaring?

Some people think that the stationary lift experienced on windy days over more or less flat ground is a form of wave lift. The air has many moods and many characteristics to the flow, some of which...

Forum: Aerodynamics

01-14-2003, 08:12 AM

Replies: 15

Delta plane airfoil

Views: 3,509

Posted By Ollie

Delta plane airfoil

The elevator in front picks the nose up by lifting the nose. The elevator in back lifts the nose by pushing the tail down. The elevator in front moves down to increase lift in the nose. The elevator...

Forum: The Clubhouse

01-14-2003, 07:57 AM

Replies: 198

Tell us what the AMA means to you? Insurance only or more. Please Vote!

Views: 15,921

Posted By Ollie

Tell us what the AMA means to you? Insurance only or more. Please Vote!

There is no single organization with as many members or as diverse a membership as the AMA that pleases even a majority of the membership all the time. Yet if those people were to reorganize into...

Forum: The Clubhouse

01-14-2003, 02:22 AM

Replies: 198

Tell us what the AMA means to you? Insurance only or more. Please Vote!

Views: 15,921

Posted By Ollie

Tell us what the AMA means to you? Insurance only or more. Please Vote!

WELL SAID, DAVE AND MIKE!!!!

Forum: RC Gliders, Sailplanes and Slope Soaring

01-13-2003, 09:12 PM

Replies: 5

Your opinion on Wanderer & Daydream

Views: 1,651

Posted By Ollie

Your opinion on Wanderer & Daydream

You would do better with a Lil Bird 2, Kestrel, Soverign or even a Spirit.

Forum: Aerodynamics

01-13-2003, 09:04 PM

Replies: 39

Symmetric airfoil aerodynamics?

Views: 8,568

Posted By Ollie

Symmetric airfoil aerodynamics?

The leading edge contour is the most important part of the airfoil. it should be maintained as accurately as possible. Covering sag will caues the airfoil in question to stall at a lower angle of...

Forum: RC Gliders, Sailplanes and Slope Soaring

01-13-2003, 05:12 PM

Replies: 17

first glider

Views: 2,291

Posted By Ollie

first glider

The list of gliders that would be good for you depends on several things:

Where will you fly? On a slope? On the flat?

Do you have a radio? What model?

Can you get flight instruction or must...

Forum: Aerodynamics

01-13-2003, 04:54 PM

Replies: 39

Symmetric airfoil aerodynamics?

Views: 8,568

Posted By Ollie

Symmetric airfoil aerodynamics?

Banktoturn,

I would appreciate it if you would be more specific about the source of the mistaken notions you are referring to and exactly what they are.

Forum: Aerodynamics

01-13-2003, 01:29 PM

Replies: 39

Symmetric airfoil aerodynamics?

Views: 8,568

Posted By Ollie

Symmetric airfoil aerodynamics?

A wind tunnel with a smoke generator reveals the physical reality of what takes place.

Start by considering a flat plate airfoil. It has no camber and little or no thickness. At zero degrees...

Forum: Aerodynamics

01-13-2003, 01:45 AM

Replies: 120

Reynald's number

Views: 9,753

Posted By Ollie

Reynald's number

The coefficient of lift is a dimensionless number that summarizes the effect of the airfoil on the lift of the wing. The lift force is equal to one half times the air density times the air velocity...

Forum: RC Gliders, Sailplanes and Slope Soaring

01-13-2003, 12:51 AM

Replies: 3

Windfree-need info

Views: 2,222

Posted By Ollie

Windfree-need info

The Windfree was designed by Rod Smith and was flown to a first place in standard class at the 1970 SOAR Nationals at Chicago in 1970 by Mark Smith (Rod's son). Mark flew the Windward at the 1969...

Showing results 1 to 25 of 500