Hi Tony,
We layed up some light weight cloth over our balsa Flettner strips. It
did not help hardness as much as I had hoped. It also made finishing
more difficult. Worst of all, it changed the shape of the strips,
rounding them off too much. We had some altitude/speed hunting which we
attributed to this. We have since redone the Flettner strips, making
sharper edges at the specified dimensions. The altitude/speed hunting
improved some after the fix.
regards,
Terry Seaver
A135 / N135TD
Tony Renshaw wrote:
>
>Gidday,
>I am wondering if there is any specific advice to laying up cloth onto the
>trim tabs trailing edges to toughen them up. The balsa is too soft and I
>intend on either using a single ply of BID, or 2 plies over the balsa with
>the ply stepping down as it progresses forward, or a single ply of carbon.
>I have the carbon left over from another project, however I think for this
>toughening up application the BID might be better, as it is more impact
>resisitant. With the Balsa, I have heard of priming it with a thinned down
>resin mix, but I haven't done this before. I understand the concept is that
>a thinner mix will be absorbed by the Balsa, and act as a better key for
>the cloth over the top. So, if there are any words of wisdom on this I'd
>like to hear. Thanks in anticipation.
>
>Reg
>Tony Renshaw
>Sydney Australia
>
>Classic 236 Taildragger (possibly convertible)
>Tail, Wings, Ailerons, Flaps Complete and Connected
>Lower Fuse in Jig, Tail Torque Tube installed
>Mass Balance assembly installed and deflections sorted
>Intended Engine: 912S or a "turboed single rotor rotary, when I am dreaming"
>Instrumentation: Undecided
>
>
>
>
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