[roc-chat] Re: Speed of Balsa
- From: Chris J Kobel <Chris.J.Kobel@xxxxxxxx>
- To: roc-chat@xxxxxxxxxxxxx
- Date: Sun, 8 May 2011 20:08:16 -0700
Jeff,
I've had several successful flights of my Estes Goblin on F39s, which sim
out at 563 mph (~825 ft/s) and 41g. She's still flying with over 16
flights logged since 1999.
It has four short span, trapezoidal shaped 1/8" balsa fins surface
attached and heavily filleted with white glue circa ~ 1974.
Chris Kobel
From:
Jeff Gortatowsky <indanapt@xxxxxxxxx>
To:
roc <roc-chat@xxxxxxxxxxxxx>
Date:
05/08/2011 05:53 PM
Subject:
[roc-chat] Speed of Balsa
Sent by:
roc-chat-bounce@xxxxxxxxxxxxx
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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