Today's Message Index:
----------------------
1. 12:15 AM - Re: basswood (Clif Dawson)
2. 05:57 AM - Re: wing incidence (Larry Nelson)
3. 06:16 AM - Re: wing incidence (Phillips, Jack)
4. 06:17 AM - Re: basswood (John Ford)
5. 06:31 AM - Re: basswood (Phillips, Jack)
6. 07:48 AM - Re: basswood (Isablcorky@aol.com)
Message 1
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Compression strength parallel to grain;
Basswood-3800 psi
Spruce-----4780 psi
D Fir--------5850 psi
Basswood is a hardwood and the others are softwoods.
( Doesn't mean it's harder, just that it's leaves fall off.)
Tensile( stretching) strength is higher than compression
in all woods. In a Piet spar with uniform dimensions top
to bottom, compression, being the weaker strength
characteristic, is the deciding factor in design and use.
Each species has it's own variation in the mix of
characteristics. Even though fir is stronger in compression
than spruce, it's splitting strength is quite inferior. Ash
is known for it's shock absorption, important in hammer
handles and baseball bats. Elm is one of the most split
resistant woods around, thus it's use for the blocks and
sheaves in the sailing ships of yore.
I think you will find basswood more brittle and less forgiving
than most of the softwoods. Not a characteristic I would
want in spars, longerons or ribs. Good carving wood though.
Clif
----- Original Message -----
From: TRichmo9@aol.com
To: pietenpol-list@matronics.com
Sent: Wednesday, April 20, 2005 3:38 PM
Subject: Pietenpol-List: basswood
i found some info on basswood its 92% stong as spruce but almost no shock resistance
so its out.
Message 2
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s=s1024; d=yahoo.com;
b=BkHYwBS1oky6vsL1bUi3DWJXjON17IsXWVyGmsDl7ovfN8QS1NbnyaPz1bqLZE9DYLQFF6s204hfXf+j1qv1CDaMuqyrpSkZa/n9eiacUC2AsYzGBGA1STefmHFRwwPfFx/sQaJ0v2SOqGZbCaoyh0EniE3Kx+ZiInVM5XND+gg=
;
| Subject: | Re: wing incidence |
--> Pietenpol-List message posted by: Larry Nelson <lnelson208@yahoo.com>
Y'all have me worried with this discusion. I have
"racked " my stock Howard Henderson cabanes back to
get my aircraft and my weight in harmony. I have the
wing where I want it, having moved it 3" aft. Will
this "racking" change the incidence of the wing?
(Here, I was thinking that after I did the lift strut
wires, that I was ready to fly her............)
--- Oscar Zuniga <taildrags@hotmail.com> wrote:
> --> Pietenpol-List message posted by: "Oscar Zuniga"
> <taildrags@hotmail.com>
>
> Mr. Smart-Alec (aka, "Jim Markle") wrote-
>
> >the airfoil's chord line is tilted up from a line
> that would be
> >drawn between these two holes.....so I believe you
> would add
> >that 1.99 to the airfoil's actual (and tilted up)
> angle of incidence...
>
> Well of course you would. I knew that, but didn't
> want to go over
> everybody's head with a bunch of engineer talk and
> trigonometry ;o) I
> should have used the proper terminology and all
> that. But both you and DJ
> confirmed what I was finding... that the difference
> in cabane length leads
> to about a 2 degree incidence change to a line drawn
> across the bottom (or
> top) of the two wing spars. What I was trying to
> get out of my head was the
> 3 degrees that I'd read somewhere, because that
> isn't what you get with a 1"
> cabane strut length difference.
>
> Thanks, gents.
>
> Oscar Zuniga
> San Antonio, TX
> mailto: taildrags@hotmail.com
> website at http://www.flysquirrel.net
>
>
>
>
>
>
> browse
> Subscriptions page,
> FAQ,
>
>
>
>
>
>
>
>
>
>
Larry Nelson
Springfield, MO
Beechcraft Bonanza V-35B N2980A
Pietenpol Air Camper N444MH
1963 GMC 4106-1618
SV/ Spirit of America
ARS WB0JOT
Message 3
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--> Pietenpol-List message posted by: "Phillips, Jack" <jphillip@alarismed.com>
Moving the wing aft will very slightly increase the angle of incidence.
I just layed it out in AutoCAD and found that with a 22" front cabane
and a 21" rear cabane, moving the wing 3" aft will increase the angle of
incidence by 0.015 degrees, or about 0.06%. I don't think I would worry
about that :-) If your cabanes are longer than that, the effect is even
less. Far more important to get the CG where it belongs.
Jack Phillips
--> Pietenpol-List message posted by: Larry Nelson
<lnelson208@yahoo.com>
Y'all have me worried with this discusion. I have
"racked " my stock Howard Henderson cabanes back to
get my aircraft and my weight in harmony. I have the
wing where I want it, having moved it 3" aft. Will
this "racking" change the incidence of the wing?
(Here, I was thinking that after I did the lift strut
wires, that I was ready to fly her............)
Message 4
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--> Pietenpol-List message posted by: "John Ford" <Jford@indstate.edu>
As an interesting (to some maybe) extra bit of Basswood trivia (this
from a long-time bass guitar player), Basswood, ironically, is an
abysmal wood to use to build bass guitars. It soaks up the low
frequency fundamentals and mutes the higher frequencies, rendering a
very nasal mid-range-ish tone with little sustain. Mostly it's used on
the really cheap Korean instruments, because it's cheaper, easy to work
and costs less to ship due to its light weight. I don't recall ever
seeing an acoustic guitar built out of Basswood either, while Sitka
Spruce is a prime acoustic guitar building wood. Not to sure how
exactly my post relates to building a Piet, other than I'm pretty sure
one built out of Spruce will sound better than one built out of
Basswood...
John (who plays a bass made of Cocobolo, Mahogany, Maple and
Purpleheart, but hasn't built his Piet yet)
John Ford
john@indstate.edu
812-237-8542
Message 5
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--> Pietenpol-List message posted by: "Phillips, Jack" <jphillip@alarismed.com>
Too bad we can't convince the music industry that Basswood is a superior
acoustic material - I hate seeing all that nice Sitka Spruce being built
into piano soundboards and guitar faces when it could be up in the air
where it belongs. My banjo is an "Aviation Friendly" instrument, being
made of maple and rosewood and not using any aircraft grade materials.
For goodness sake, Do Not Archive!
Jack Phillips
Raleigh, NC
"Pickin' and Grinnin' and workin' on the Pietenpol"
--> Pietenpol-List message posted by: "John Ford" <Jford@indstate.edu>
As an interesting (to some maybe) extra bit of Basswood trivia (this
from a long-time bass guitar player), Basswood, ironically, is an
abysmal wood to use to build bass guitars. It soaks up the low
frequency fundamentals and mutes the higher frequencies, rendering a
very nasal mid-range-ish tone with little sustain. Mostly it's used on
the really cheap Korean instruments, because it's cheaper, easy to work
and costs less to ship due to its light weight. I don't recall ever
seeing an acoustic guitar built out of Basswood either, while Sitka
Spruce is a prime acoustic guitar building wood. Not to sure how
exactly my post relates to building a Piet, other than I'm pretty sure
one built out of Spruce will sound better than one built out of
Basswood...
John (who plays a bass made of Cocobolo, Mahogany, Maple and
Purpleheart, but hasn't built his Piet yet)
John Ford
john@indstate.edu
812-237-8542
Message 6
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Basswood was the choice of piano manufactories for the keyboards. Light and
strong.
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