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Re: Please describe control cables
By:Mark Kanzler
Date: 8/27/1998, 6:55 pm
In Response To: Re: Please describe control cables (Tom Scheibe)

I'm going to nit pick here. A golfball uses the dimples to create a turbulent boundary layer. A turbulent boundary layer is more robust than a laminar boundary layer. Laminar boundary layers have less drag, but are harder to maintain because they are very sensitive to tripping by small surface imerfections. Turbulent boundary layers tend to stay attached even when minor imperfections in the suface exist.

I should have started this lecture by pointing out that there are three primary types of flow: laminar, turbulent, and detached flow. Detachment is where the boundary layer separates from the surface, and it occurs earlier in laminar flows. As the flow detaches, drag goes up drastically. A turbulent boundary layer has more drag than laminar, but will remain attached longer than laminar flow. Sometimes laminar flow, when tripped, becomes a turbulent boundary layer (a smoother transition). But, often a laminar flow will detach before becoming a turbulent boundary layer.

Introduction to Flight by John D. Anderson Jr. explains these phenomena in easy to understand language. I highly recommend the book, but being a textbook, it's expensive. The principles apply to hydrodynamics in almost all cases.

> even though they may be
> producing some kind of turbulence, may even have increased laminar flow.
> (the golf ball metaphor)

> Anyway, loath to trust my verbal description, here is a diagram.

> Tom

Introduction to Flight by John D. Anderson

Messages In This Thread

integral rudder...again
Tom Scheibe -- 8/24/1998, 7:03 pm
Re: integral rudder... another question
Edgar Kleindinst -- 8/30/1998, 12:01 am
Re: integral rudder... another question
Nick Schade -- 8/31/1998, 5:51 pm
Re: integral rudder... another question
Edgar Kleindinst -- 9/4/1998, 5:29 pm
Re: integral rudder... another question
Tom Scheibe -- 8/31/1998, 2:18 pm
Re: integral rudder... another question
Joe Greenley -- 8/29/1998, 2:21 pm
Re: integral rudder... Dagger Atlantis
Mark Kanzler -- 8/31/1998, 12:07 am
Re: integral rudder on Dagger Sitka
Ross Leidy -- 9/1/1998, 1:54 pm
Please describe control cables
Pete Ford -- 8/25/1998, 7:47 pm
Re: Please describe control cables
Tom Scheibe -- 8/25/1998, 11:23 pm
Re: Please describe control cables
Mark Bodnar -- 8/26/1998, 6:03 pm
Re: Please describe control cables
Tom Scheibe -- 8/27/1998, 4:29 pm
Re: Please describe control cables
Mark Kanzler -- 8/27/1998, 6:55 pm
Re: Please describe control cables
Nolan Penney -- 8/28/1998, 6:49 am
Re: integral rudder...again
Nolan -- 8/25/1998, 6:46 am
Re: integral rudder...again
Tom Scheibe -- 8/25/1998, 4:36 pm
Re: integral rudder...again
Tom Scheibe -- 8/25/1998, 5:11 pm
Re: integral rudder...again
Nolan Penney -- 8/26/1998, 6:31 am
Re: integral rudder...again
Tom Scheibe -- 8/26/1998, 2:30 pm
Re: integral rudder...again
Nolan Penney -- 8/26/1998, 3:06 pm
Re: integral rudder...again
Mark Kanzler -- 8/28/1998, 12:07 am
Re: integral rudder...again
Nolan Penney -- 8/27/1998, 3:19 pm
Re: integral rudder...again
Mark Kanzler -- 8/27/1998, 7:09 pm
Re: integral rudder...again
Nolan Penney -- 8/28/1998, 7:05 am
Re: integral rudder...again
Mark Kanzler -- 8/28/1998, 11:08 am
Re: integral rudder...again
Nolan Penney -- 8/28/1998, 3:14 pm
Re: integral rudder...again
Mark Kanzler -- 8/29/1998, 10:55 am
Re: integral rudder...again
Mark Kanzler -- 8/28/1998, 10:59 am
Re: integral rudder...again
Nolan Penney -- 8/28/1998, 3:24 pm
Re: integral rudder...again
Mark Kanzler -- 8/29/1998, 11:10 am
Re: integral rudder...again
chris_rolt -- 8/28/1998, 7:14 pm
Re: integral rudder...again
Mark Kanzler -- 8/29/1998, 11:34 am
Re: integral rudder...again
Mark Kanzler -- 8/28/1998, 11:49 am
Re: New BBS Format
Mark Kanzler -- 8/27/1998, 7:14 pm
Re: integral rudder...again
Mark Kanzler -- 8/25/1998, 4:49 pm
A Picture - Rudder on a Cobra Kayak
Tom W. -- 8/25/1998, 3:19 pm
Re: A Picture - Rudder on a Cobra Kayak
Mark Kanzler -- 8/25/1998, 3:55 pm
Re: integral rudder...again
John Lange -- 8/25/1998, 1:01 pm
Re: Dagger Sitka Link
Mark Kanzler -- 8/25/1998, 3:52 pm
Re: Dagger Sitka Link
John Lange -- 8/25/1998, 4:25 pm
Re: Dagger Sitka Link
Mark Kanzler -- 8/25/1998, 4:37 pm
Re: 24' x 26"??
Wynne -- 8/27/1998, 3:04 pm
Re: 24' x 26"??
Mark Kanzler -- 8/27/1998, 7:21 pm
Re: integral rudder...again
Mark Kanzler -- 8/25/1998, 10:55 am
Re: Flow tank testing.
Mark Kanzler -- 8/24/1998, 8:37 pm