Boat Building Forum

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Re: Old Textbooks, etc.
By:Mark Kanzler
Date: 7/11/1998, 12:52 am
In Response To: Re: Higher Aspect ratio = No Steering (NPenney)

No problem, I sometimes worry about the same thing (I'm not rude, just socially challenged)

> Hey, where'd my emoticon go?! I stuck a smiley face at the end
> of my first sentence to make sure it didn't sound huffy.

I have an old aero book (ca. 1930) that shows that as leading edge radii get sharper, the stall gets gentler. This matches my experience with models, even though populsr opinion runs opposite. One of my aerodynamics profs (who works as an aerodynamicist) agreed with the book, and he showed me why it's so.

When I looked at data from wind tunnel tests and Abbot and Von Doenhoff's theoty of wing sections, it shows that the sharp leading edge tends to give a gentler stall. Where the popular myth started, I don't know. Another prof (PhD from M.I.T.) tried to tell me I, and Warner (I didn't tell him about the other prof) were wrong. He couldn't back it up with data though.

> Oh, the book I was using at the time was the Mechanical Engineers
> Handbood by Lionel S Marks. Circa 1930. Old as heck but really neat.
> Got lots of fascinating steam locomotive information. It's fun to
> compare against modern publications, just to see how much has not
> changed. Graphs of Cl against aspect ratio it did not have, just tables
> of that. I stuffed the tables into a spreadsheet so I could see graphs.
> I like pictures, find them easier to work with conceptually then stacks
> of numbers.

Messages In This Thread

Mayday Mayday! boat goes left
David Walker -- 7/6/1998, 9:17 pm
Re: Try another paddler
Jay Babina -- 7/7/1998, 2:32 pm
Re: Mayday Mayday! boat goes left
Mark Kanzler -- 7/7/1998, 11:51 am
Re: rudders
NPenney -- 7/8/1998, 8:17 am
Re: Aspect ratio.
Mark Kanzler -- 7/8/1998, 11:21 am
Re: Aspect ratio.
NPenney -- 7/8/1998, 2:34 pm
Re: Aspect ratio.
Nick Schade -- 7/8/1998, 3:17 pm
Re: Higher Aspect ratio = No Steering
NPenney -- 7/9/1998, 7:49 am
Re: Higher Aspect ratio = No Steering
Mark Kanzler -- 7/9/1998, 10:38 am
Re: Higher Aspect ratio = No Steering
NPenney -- 7/9/1998, 11:50 am
Re: Old Textbooks, etc.
Mark Kanzler -- 7/11/1998, 12:52 am
Re: Old Textbooks, etc.
NPenney -- 7/10/1998, 2:53 pm
Re: Here's a sketch of one possible solution (as described in prev post)
Mark Kanzler -- 7/8/1998, 12:41 am
Image link still not working.
Mike Spence -- 7/7/1998, 1:28 pm
Re: Image link still not working. (Sorry)
Mark Kanzler -- 7/7/1998, 1:56 pm
Re: Image working.(?)
Mark Kanzler -- 7/8/1998, 1:26 am
Not yet. - Don't despair!
Mike Spence -- 7/8/1998, 1:19 pm
Re: Not yet. - Don't despair!
Mark Kanzler -- 7/8/1998, 2:18 pm
Re: Here it is! (Satisfaction Guaranteed)
Mark Kanzler -- 7/8/1998, 10:23 pm
Re: Here it is! (Satisfaction Guaranteed)
David Walker -- 7/10/1998, 10:28 am
Re: Surfbard skegs.
Mark Kanzler -- 7/10/1998, 11:58 am
Re: Surfbard skegs.
David Walker -- 7/10/1998, 1:49 pm
Re: Surfbard skegs.
David Walker -- 7/10/1998, 5:30 pm
Re: Surfbard skegs.
Mark Kanzler -- 7/12/1998, 11:08 am
Re: Surfbard skegs.
Paul Jacobson -- 7/12/1998, 7:18 pm
Re: Surfbard skegs site (try it again please).
Mark Kanzler -- 7/10/1998, 2:50 pm
Re: Surfbard skegs site (try it again please).
Mike Spence -- 7/10/1998, 6:51 pm
Re: Here it is! (Satisfaction Guaranteed)
Nick Schade -- 7/9/1998, 4:12 pm
Re: Here it is! (Satisfaction Guaranteed)
Mark Kanzler -- 7/11/1998, 12:37 am
Re: Mayday Mayday! boat goes left
Mark Kanzler -- 7/8/1998, 12:39 am
My $0.02
CHad -- 7/7/1998, 11:29 am
P.S.
CHad -- 7/7/1998, 11:56 am
Re: P.S.
Guy Wright -- 7/7/1998, 1:46 pm
Me Too!
Shawn Baker -- 7/8/1998, 11:01 am
Re: Mayday Mayday! boat goes left
NPenney -- 7/7/1998, 7:33 am
how I solved mine.
R. N. Sabolevsky -- 7/6/1998, 11:56 pm
Re: Mayday Mayday! boat goes left
Duane Strosaker -- 7/6/1998, 11:38 pm
Re: Mayday Mayday! boat goes left
Mike Spence -- 7/7/1998, 12:11 pm
Re: Mayday Mayday! boat goes left
Paul Jacobson -- 7/6/1998, 11:20 pm
Off center fins and water flow
David Walker -- 7/8/1998, 5:28 pm
Re: Off center fins and water flow
NPenney -- 7/9/1998, 11:57 am
Re: Off center fins and water flow
Mike Spence -- 7/9/1998, 5:56 pm
Re: Off center fins and water flow
Paul Jacobson -- 7/11/1998, 2:53 am
Re: Off center fins and water flow
Mark Kanzler -- 7/10/1998, 11:47 am
Re: Off center fins and water flow
NPenney -- 7/10/1998, 6:22 am
Re: Skegs and water flow.
Mark Kanzler -- 7/8/1998, 6:10 pm
Re: Skegs and water flow.
David Walker -- 7/8/1998, 6:42 pm
Re: Skegs and water flow.
Mark Kanzler -- 7/8/1998, 7:07 pm
Re: Skegs and water flow.
David Walker -- 7/10/1998, 10:37 am
Re: Skeg attachment w/ silicone.
Mark Kanzler -- 7/10/1998, 11:34 am
Re: Mayday Mayday! boat goes left
Wes Boyd -- 7/6/1998, 10:36 pm