[roc-chat] Re: Motor and Case Fitting
- From: David Erbas-White <derbas@xxxxxxxxxxxxxxxx>
- To: roc-chat@xxxxxxxxxxxxx
- Date: Sun, 16 Dec 2012 10:48:32 -0800
On 12/16/2012 10:43 AM, chris_coffee@xxxxxxxxxx wrote:
It's perfectly normal to use a motor casing longer than the motor tube.
Standard, in fact.
The motor tube only needs to be long enough to be stably mounted in the
rocket, and to properly hold the motor casing centered in the rocket.
Beyond that, it's really just excess weight.
That having been said, make absolutely sure you have a thermal blanket
between the hot motor casing and any potentially meltable recovery
components (i.e., nylon shock cord or nylon parachute).
David Erbas-White
That's what I'm thinking, too. Ok, one final question. What is the
general consensus on motor casings being longer than the motor tube?
Is it safe to use a motor that is, say 19.5" long, in a motor tube
that is only 10" long considering the CP is aft of the CG?
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