Originally Posted by
Jgwright
When we were flying last week one of our group had a jet that he bought fairly new second hand and the aileron servo just dropped out on landing! On inspection the servo hardwood blocks were glued to some 'Chinese' ply. The glue bond had not failed but with very little force the ply had delaminated. When you have finished you tests and selected the 'best' adhesive it will be interesting if you could use it on different commonly used mounting materials. I am certain that the Chinese ply faced plates will delaminate before the servo would fail and would surprise some.
Your tests while good for comparison are not what we normally see in our airframes.
John
100% agree with you on Chinese ply. This is why we use aero grade Finnish birch ply. Millions of miles away in terms of quality...
Yep, the purpose of this test is mostly for comparison.
However this is also relevant to what we experience on the airframe we sell. The Mibo A-10 is using above ply/ glassfiber laminated servo hatches and we glue our PYCABS servo brackets or the original Mibo plywood servo bracket on them. In fact lots of the kits we sell use this technique and it is very relevant for me and for all further designs to have a precise idea of glue joints resistance.
I have two large model kits being designed right now and these will use the same technique. I have a resistance module in the CAD software I use and I need that data to implement glue joint resistance in the assembly of these models...