• The Biplane Forum is a large global active community of biplane builders, owners and pilots. From Pitts to Skybolts, to older barnstormers, all types are welcome. In addition to our active community, our content boasts exhaustive technical information which is often sought after for projects and maintenance. This information has accumulated over the 12+ years the forum has been in existence.

    The Biplane Forum is a private community. Subscriptions are only $49.99/year or $6.99/month to gain access to this great community and unmatched source of information not found anywhere else on the web. We are also a great resource for non biplane users, since many GA aircraft are built the same way (fabric and tube construction).

Laminated spruce spar

Jean-luc

Well-Known Member
Lifetime Supporter
Joined
Jul 18, 2007
Messages
919
Reaction score
72
I have build my Pitts laminated spruce spars using three to four .25" layers (depend of the spar thickness) and T88 glu.All was perfect,even all parts test never broke at the glu lines.A few days ago,I made the .75" holes where go the pin tubes use to hold the flying wires bolts,using a .75" hole saw.For one spar,the wood part that was inside the hole saw broke in three parts at two glu lines.The glu is there,but didn't penetrated at all.So even if the spar seems to be nice from the outside,I do not know if I can have the same problem on other glu lines....and what to do!!!!!!!!!!!
 

Latest posts

Top