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  #1  
Old 12-20-2005, 03:41 PM
ShaleDC ShaleDC is offline
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Default Wanted - Longeron Spruce

I have to purchase additional spruce strips for the longerons on my project, but really don't feel like paying $150 for truck shipping & crating, when I'm ONLY buying the longerons.

Is anyone else making a Chapt. 4 purchase? If you live near Virginia, would you like to order extra longeron spruce (won't cost any more shipping than the standard order), and I'll buy them from you?

Or -- does anyone know where else (other than AC Spruce / Wicks) that you can get aviation grade spruce for the longerons? I need about 6 pieces of 12' x 3/4" x1".
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Last edited by ShaleDC : 12-20-2005 at 11:49 PM.
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  #2  
Old 12-20-2005, 11:21 PM
Lynn Erickson Lynn Erickson is offline
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Is that 12" or 12'? why would it cost $ 150 to ship 12" piece of spruce?
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  #3  
Old 12-20-2005, 11:52 PM
ShaleDC ShaleDC is offline
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Quote:
Originally Posted by Lynn Erickson
Is that 12" or 12'? why would it cost $ 150 to ship 12" piece of spruce?
I meant 12 feet, not inches. It costs that much because they have to put it in a crate and send it freight, since it's too long to send via UPS. Normally that's no big deal, because most people buy the longeron spruce along w/the other stuff for chapters 4-8, so sending all that stuff freight ends up being cheaper than UPS.

On the other hand, when all you want is 6 measly peices of spruce, it's kinda pricey!
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(also build a MkIV fuselage, w/plans #1279)
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  #4  
Old 12-21-2005, 12:32 AM
ShaleDC ShaleDC is offline
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The other issue is that I need it soon, and shipping is all screwed up around this time of year.

Is there any reason I can't purchase high-quality spruce cap strip from a local source??? Obviously not home depot, but there have to be other sources for high quality wood.
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(also build a MkIV fuselage, w/plans #1279)
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  #5  
Old 12-21-2005, 01:03 AM
ShaleDC ShaleDC is offline
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Umm... maybe I'm just ignorant, but is there any reason why I can't just buy a highest grade spruce pine board locally, and just rip the strips myself on my tablesaw???
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  #6  
Old 12-21-2005, 01:05 AM
Lynn Erickson Lynn Erickson is offline
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Douglas fir can be subsituted for spruce if the grain specs are the same. Check AC 40-13. the marine industry uses spruce for building sail boat masts. here in so cal we have marine lumber yards.
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Lynn Erickson A&P for lets say almost 30 years
Much better with a Dremel than a computer.
What if they gave me choice between a fast computer or a fast plane?
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  #7  
Old 12-21-2005, 01:10 AM
Lynn Erickson Lynn Erickson is offline
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Correction, Thats AC-43.13
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Lynn Erickson A&P for lets say almost 30 years
Much better with a Dremel than a computer.
What if they gave me choice between a fast computer or a fast plane?
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  #8  
Old 12-21-2005, 01:18 AM
Lynn Erickson Lynn Erickson is offline
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http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/1ab39b4ed563b08985256a35006d56af/99c827db9baac81b86256b4500596c4e/$FILE/Chapter%2001.pdf

Try this site for substitude wood. it says Douglas fir is stronger than spruce
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This is my opinion of these facts and only my opinion, your opinion may vary

Lynn Erickson A&P for lets say almost 30 years
Much better with a Dremel than a computer.
What if they gave me choice between a fast computer or a fast plane?
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  #9  
Old 12-21-2005, 01:28 AM
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Quote:
Originally Posted by Lynn Erickson
http://www.airweb.faa.gov/Regulatory...apter%2001.pdf

Try this site for substitude wood. it says Douglas fir is stronger than spruce
Just be suuuure you meet the criteria listed... don't just go grab a peice of douglas fir from home depot and saw it up to use.
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  #10  
Old 12-21-2005, 02:16 AM
ShaleDC ShaleDC is offline
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Quote:
Originally Posted by JonC
Just be suuuure you meet the criteria listed... don't just go grab a peice of douglas fir from home depot and saw it up to use.
It's been a long time since I did Chapt. 5, what exactly are the "listed criteria" for the Cozy MK longerons?
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Redesigned 4-place canard.
500+ hrs into prototype build, Start Oct. 1, 05

(also build a MkIV fuselage, w/plans #1279)
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  #11  
Old 12-21-2005, 02:19 AM
ShaleDC ShaleDC is offline
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Oh I see, the criteria in the FAA circular. After elimnating the various non-permitted defects, it seems that the most important criteria would be cured wood w/a no more than a 1:15 grain slope.
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Redesigned 4-place canard.
500+ hrs into prototype build, Start Oct. 1, 05

(also build a MkIV fuselage, w/plans #1279)
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  #12  
Old 12-21-2005, 02:32 AM
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Quote:
Originally Posted by ShaleDC
Oh I see, the criteria in the FAA circular. After elimnating the various non-permitted defects, it seems that the most important criteria would be cured wood w/a no more than a 1:15 grain slope.
If you ignore the part about ANC-19, yes.... "All wood and plywood used in the repair of aircraft structures should be of aircraft quality (reference Army Navy Commerce Department Bulletin ANC-19,...) Table 1-1 lists some permissible variations in characteristics and properties of aircraft wood..."

This is a document from the goverment.... you must read it carefully and look at the key words... reference and some

I unfortunatly do not have ANC-19, so I cannot tell you what it says on the subject, and I do not believe it is available online... but it might be.
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  #13  
Old 12-21-2005, 08:08 AM
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But this is experimental, right? Regs don't apply.

You could use balsa wood or popcicle sticks if you want.
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  #14  
Old 12-21-2005, 08:51 AM
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Just a thought here. Ask Spruce to cut t to length for you and then it can go in a box or tube and ship UPS for example. A cut charge is cheaper than crating!
And you get the right stuf
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  #15  
Old 12-21-2005, 11:18 AM
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Well, lets step back just a moment - the longerons, in this case, are not structural AND are wrapped in glass. the purpose of the longerons is for ease of attachment, or so we have been told buy a few that hold themselves out as knowledgeable.

Since that is the case - good quality other wood should be no problem to substitute. As the pieces are bent, straight grain should be found, but as the bending is very minor, the 1 in 12: grain runout could probably be reduced to 1 in eight inch, these are not pretzel bends
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