Last Updated : 14 February, 2007
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The following question came from Ray Kostuk


How do you install the shear webs in a Chrysalis?

    I just finished one wing half and upon closer examination of the instructions (and the question on this site "What causes Chrysalis wing failure on launch?") believe you intended the shear webs to be glued to the AFT side of the spar caps. I have glued the shear webs CENTERED INSIDE and between the upper and lower spar caps (I-beam style, just like the pre-cut A-B, J-K1, and K2-L shear webs, as shown on the drawings). Would you recommend leaving it as-is, or knocking the webs out and installing new ones on the aft side of the spar, or just adding more shear webs on the aft side. I have to admit it is difficult for me to tell from the instructions exactly where on the spars (forward-aft direction) to glue the shear webs.
    Thanks for any advice and clarification you can provide.

From Don Stackhouse:

David, sorry about your confusion. Actually, provided that you did a good job fitting and gluing the shear webs, so that you have excellent quality glue joints, installing the shear webs in the middle of the spar caps I-beam style is stronger in most cases. We don't show it that way on the plans because the typical beginning modeler would probably find that much more difficult than installing them on the edges of the caps, box spar style. What I would recommend is that you add a second shear web, still I-beam style, right against the first, between ribs B and F. This takes care of the concerns discussed in "What causes Chrysalis wing failure on launch?". I would also recommend adding the extra balsa to the tops of the finger pegs as discussed in the article, and being careful not to hook your fingers over the tops of the finger pegs.

We periodically update our designs based on feedback from customer experience, and the shear webs on the Chrysalis are one item we've targeted for the next round of changes. Thanks for the feedback, it will definitely be put to good use!

Don Stackhouse @ DJ Aerotech



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