[roc-chat] Re: Speed of Balsa
- From: "JACK GARIBALDI" <jackgaribaldi@xxxxxxx>
- To: <roc-chat@xxxxxxxxxxxxx>
- Date: Mon, 9 May 2011 19:50:56 -0700
Steve
This week I will have the new E75 and G100 24mm motors from Cesaroni, get
another one out of the closet.
Jack G
----- Original Message -----
From: Steve Trammell<mailto:stramm8235@xxxxxxxxxxx>
To: roc-chat@xxxxxxxxxxxxx<mailto:roc-chat@xxxxxxxxxxxxx>
Sent: Monday, May 09, 2011 7:22 PM
Subject: [roc-chat] Re: Speed of Balsa
I put sealed balsa fins, clipped delta style, 3/16" thick, on a bashed Estes
SkyWriter and it didn't survive the transition through mach on an AT single
use, 24mm F. Jack G. still delights in busting my chops over that flight. It
was an impressive shred though; biggest piece left was the nose cone.
Steve Trammell
On Sun, May 8, 2011 at 5:53 PM, Jeff Gortatowsky wrote:
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)
---------------------------------------
Jeff Gortatowsky, Redondo Beach, CA | Twitter: JeffGortatowsky | Yahoo:
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"(Scientific) Skepticism is not a set of beliefs, it is a set of methods for
asking questions about reality." -- Doctor Steven Novella
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