[WWI] Added:Nieuport 28 and more!

[Mark Shannon]

Very nice Nieuport and Sopwith.

As far as the "anhedral" vs. "negative dihedral", it apparently goes in
circles in aerodynamics.  Negative dihedral is the mathematical term, and
in some decades the engineers agree with the math department and in others
they want to distinguish their terms.

I was taught "anhedral" in my early youth, was told that engineers were
"now referring to it as 'negative dihedral'" in the mid to late sixties,
(the decade, not my age) and now it seems to have returned to "anhedral." 
Both are acceptable, with positive and negative dihedral being the proper
one in a topology / multidimensional geometry context.

A similar one is teaching that there is no such thing as "centrifugal
force," it is all "positive or negative centripetal force."  Who but a
classical physicist is going to say they were held in their seat on the
roller coaster by negative centripetal force?  (Maybe their students, while
on the field trip to the amusement park)

Mark Shannon
shingend at ix.netcom.com



> [Original Message]
> From: Andy Bannister <a.bann at ntlworld.com>
> To: World War I Modeling Mailing List <wwi at wwi-models.org>
> Date: 8/1/2007 2:03:54 PM
> Subject: Re: [WWI] Added:Nieuport 28 and more!
>
> Tom,
> It appears that Wikipedia agrees with you (see
> http://en.wikipedia.org/wiki/Dihedral ), however it was always my
> understanding that dihedral can be both negative and positive and as I say
> this is the dictionary definition of it. I think anhedral may be a more
> modern term. I have a book from the '50s on supersonic flight and it
states
> dihedral only - positive or negative. No mention of anhedral.
> I guess either is correct!
> Andy
>
> > -----Original Message-----
> > From: wwi-bounces at wwi-models.org 
> > [mailto:wwi-bounces at wwi-models.org] On Behalf Of Tom Mason
> > Sent: 01 August 2007 15:42
> > To: World War I Modeling Mailing List
> > Subject: Re: [WWI] Added:Nieuport 28 and more!
> > 
> > 
> > Andy,
> > 
> > I am going by what I have read on aerodynamics. They all 
> > state that the 
> > opposite of dihedral is anhedral.
> > 
> > T.O.M.
> > ----- Original Message ----- 
> > From: "Andy Bannister" <a.bann at ntlworld.com>
> > To: "World War I Modeling Mailing List" <wwi at wwi-models.org>
> > Sent: Wednesday, August 01, 2007 6:57 AM
> > Subject: Re: [WWI] Added:Nieuport 28 and more!
> > 
> > 
> > > Actually, Scott's correct Tom. The word "dihedral" can be 
> > negative or
> > > positive. There is no such thing as anhedral in this 
> > context. According to 
> > > my dictionary anyway.
> > >
> > > Andy
> > >
> > >>
> > >> From: "Tom Mason" <tom.mason at charter.net>
> > >> Date: 2007/08/01 Wed AM 04:25:24 GMT
> > >> To: "World War I Modeling Mailing List" <wwi at wwi-models.org>
> > >> Subject: Re: [WWI] Added:Nieuport 28 and more!
> > >>
> > >> Scott,
> > >> Very nice Nieu. 28 & Sopwith Triplane.
> > >> One small thing and not really a criticism. The term negative 
> > >> dihedral is incorrect. It should be called anhedral.
> > >>
> > >> T.O.M.
> > >> ----- Original Message -----
> > >> From: <gm-admin at wwi-models.org>
> > >> To: <wwi at wwi-models.org>
> > >> Sent: Tuesday, July 31, 2007 9:57 PM
> > >> Subject: [WWI] Added:Nieuport 28 and more!
> > >>
> > >>
> > >> >   Scott Janney sent in photos of his
> > >> > Nieuport 28,
> > >> > See 
> > http://www.wwi-models.org/Images/Janney/Allied/index.html#Nie28
> > >> > Sopwith Triplane N500,
> > >> > See 
> > >> > http://www.wwi-models.org/Images/Janney/Allied/index.html#SopN500
> > >> > or see news.
> > >> > Sincerely,
> > >> > WWI Web Admin
> > >> >
> > >>
> > >>
> > >>
> > >
> > > -----------------------------------------
> > > Email sent from www.virginmedia.com/email
> > > Virus-checked using McAfee(R) Software and scanned for spam
> > > 
> > 
> > 
>