[roc-chat] Re: Speed of Balsa
- From: "JACK GARIBALDI" <jackgaribaldi@xxxxxxx>
- To: <roc-chat@xxxxxxxxxxxxx>
- Date: Sun, 8 May 2011 20:46:16 -0700
Jeff asked Steve Trammell how many flights he had on his rocket when the new
F32's came out I gave him a demo motor at the time.
Jack G
----- Original Message -----
From: Chris J Kobel<mailto:Chris.J.Kobel@xxxxxxxx>
To: roc-chat@xxxxxxxxxxxxx<mailto:roc-chat@xxxxxxxxxxxxx>
Sent: Sunday, May 08, 2011 8:08 PM
Subject: [roc-chat] Re: Speed of Balsa
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
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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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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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