[roc-chat] Re: Speed of Balsa
- From: David Erbas-White <derbas@xxxxxxxxxxxxxxxx>
- To: roc-chat@xxxxxxxxxxxxx
- Date: Sun, 08 May 2011 20:15:50 -0700
On 5/8/2011 5:53 PM, Jeff Gortatowsky wrote:
IMHO, much of it depends on how it is finished. I've occasionally used
self-adhesive labeling paper layered onto the outside of balsa to
strengthen it, to very good effect. Also, the type of material used for
finishing makes a big difference -- balsa fillercoat doesn't add much
strength, sanding sealer seems to add a lot (as the sealer seems to soak
in and fill the pores more thoroughly). And as mentioned, the type of
fillet (and adhesive used) will have a major bearing, as will the
aerodynamic shape of the fin. I'm not sure there's any real
hard-and-fast rule one can follow given all of these variables...
David Erbas-White
I know is a 'generalization' and there are many variables... but in
general any know what sort of acceleration or velocity makes one say,
"Okay, 1/8 inch surface mounted fins are gonna shred."
I realize the planform makes a big difference because of flutter. Just
curious because I been simulating some of my paper and balsa 24mm MMT
rockets using the newly cert'd CTI 24mm loads. The F240VM gets into
the 800ft/sec range! (For comparison an D15 is 230 and an E28 is about
450 ft/sec)
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