lml@lancaironline.net Mailing List Archive

<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> In a message dated 11/11/0 10:33:32 PM, Bill Hannahan wrote: <<I hope nobody gets the idea of saving weight by replacing phenolic blocks in the plans with arrow stock as that would reduce the strength of the attachment. The blocks are sized to reduce stress to acceptable levels prior to transition into cored material.>> Bill obviously read Dan Schafer's post on this idea and raises an important point. I also hope nobody replaces factory-recommended phenolic with arrow stock. However, Dan's idea of arrow stock for generic bolt holes is a good one which can be used some places, but not others. Just like click-bond studs, which are great for low stress conections but not for high stress connections. (I was going to use them to attach my rudder cables to the firewall. I called up Click-Bond and found out that they're not anywhere near strong enough for that.) Related to canopy latches, I played with the hooks engaging the delrin blocks and was amazed at how much force is applied to the delrin. I wouldn't be happy with locally reinforced bolt holes there (though it may be fine, I don't realy know), but solid flox under the aluminum striker plate (with or without arrow stock) seemed like it would be adequate. However, I couldn't come up with a way to completely core out this area and shove the wet flox down through the latch hook holes as it was not possible for me to get a coring tool (a Dremel bit) down in there. As a result, I completely cut off the aft face of the canopy rollover under the striker plates and did a good coring out job. I could have closed it out with flox, but decided to put 3/8 inch thick phenolic there and covered it with 6 BID. Plenty strong now. Thanks to Ross Connell, who says Lancair will be amending the instructions with better guidance in this area, so chumps like me don't have to bother all you guys with this again... - Rob Wolf LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com.