Spruce vs Cedar - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-10-2009, 09:30 AM   #11
I am: Boolean21
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Re: Spruce vs Cedar

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Which ever you use be sure it is a good quality strait grain sample. Unless you buy boat or aircraft grade your wood may have faults called timber shakes. These are flaws from large noticable to small unnoticeable stress points caused by many different things but most commonly caused where one tree has been fell over another. These are very weak and will break like a carrot with any kind of bending moment. Aircraft and boat building lumber is usually certified clear of these faults.

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Old 01-10-2009, 12:19 PM   #12
Cross Check
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Re: Spruce vs Cedar

Hi Dennis,

You're right about shakes. A Royal PITA because they are very hard to see in 'raw' lumber. One way to spot them is when the piece is planed, go along it with a wet rag looking closely for any very tiny cross grain cracks. You don't soak the wood, just wet it enough to get a colour change.

Spruce species vary allot. From old growth 'Sitka' or Ladder stock(which we want for spars/etc.) down to the 'farmed' spruce used in home construction. If you have ever seen a 2X4 twisted 90deg. over 6 ft, you know the stuff I'm talking about.

Likewise, cedars vary allot too. The cypris (sp?) is nice because it is slow growing and therefore has nice tight grain(rings)

Then there are Pines, that are getting down on tensile/compressive strength and tend to be 'resiny' which affects glueability.

Tom, your balsa block might have 'dried out' too much. There is a moisture content (I believe below 5%) that affects the cell structure, therefore the strength. 8-10% is ideal.

Snipes are cool. I've wood re-decked a couple of glass hulled ones. They still racing them in Lake Belwood?

Take care,
Have fun,
Maac 6437
Unabashed Combat Team
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Old 01-10-2009, 12:24 PM   #13
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Re: Spruce vs Cedar

Not sure about belwood, but they race a number of them at Guelph Lake.

Thanks for the info on the woods. The balsa is still ok, just is a little dryer than the hobby store stuff.
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