Originally Posted by
serious power
Hi Isaac,
Thanks for the concern - much appreciated.
I have been honeycombing like this since the mid 1980's.
Everything has to be right ; foam quality/work, wood grain orientation, bonding of wood to foam and stress focal points must be avoided/managed.
With a diamond pattern there is sheer web at all chord depths by the full length of the panel so if the foam and the bonding is good such a failure will not happen - unless there is some stress focusing.
Also I am creating a composite skin.
I believe it will be ok.
Thanks again.
Brian
I think so too. A couple key points (making the assumption that Najary built a monoplane with retracts).....
1- the stressed skin used takes quite a bit of load both in compression and especially tension.
2- it's a bipe; each wing's load is considerably lower than that of a monoplane's. Same g's load each wing significantly less, at least 35% less.
3- Years ago chances are we were dealing with retracts which always compromised the lower skins unless proper reinforcements were added.
4- The servo cutout also compromises the lower skins. However, one only needs to extend the facings of the aileron cutouts some 3-4 inches towards the root to greatly reduce the sharp load by distributing the stress riser over a longer arm.