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Building Tips and technical articles. => Building techniques => Topic started by: david bailey on September 18, 2009, 12:54:24 PM

Title: Fuselage Doublers
Post by: david bailey on September 18, 2009, 12:54:24 PM

I'm scratch building a full fuselage for a .25 size plane.  Does it make a difference in which direction the grain runs on the ply doublers?

Title: Re: Fuselage Doublers
Post by: Randy Powell on September 18, 2009, 01:40:26 PM

Good question. I usually use either 1/32 or 1/64 plywood for doublers (depending on nose structure) and have always ran the grain the same direction as the fuse sides.

Title: Re: Fuselage Doublers
Post by: minnesotamodeler on September 18, 2009, 03:47:39 PM

That has always seemed to be the common-sense approach to me.  Sure, plywood layers have alternating grains by definition, but has more plies running the direction that's on each face.  You're looking for longitudinal strength; that's the direction you should run the (exposed) grain..

Title: Re: Fuselage Doublers
Post by: Ward Van Duzer on November 02, 2009, 08:18:58 AM

Some would say that balsa doublers sandwiched with C/F veil will be more vibration absorbing than ply.


W.