[roc-chat] Re: Pesky Pin Holes

  • From: David Erbas-White <derbas@xxxxxxxxxxxxxxxx>
  • To: roc-chat@xxxxxxxxxxxxx
  • Date: Wed, 30 Nov 2011 18:12:22 -0800

On 11/30/2011 5:54 PM, STEVE BATTAGLIA wrote:

(well, it's only off-topic because you didn't start a new thread...)
You need to look at the thrust curves. It's not a linear thrust, the total Newtons is integrated over the total burn time, If you look at the typical thrust curve, there is an initial peak for 10-20% of the burn time, followed by a lower-level sustaining thrust, with various degrees of fall-off. You really have to look at the thrust curves to understand it all - look at the NAR website, or manufacturer's data, etc. 

David Erbas-White



a bit off topic....but......
Can someone check my work here.... I pulled most of the conversions from the web..... might have been using some bum math.... 
_
_
_1st Stage_ = 5500 lbf which = 24,475 N7.48 sec burnwhich equals 183,073 Ns _2nd Stage_ = 2100 lbf which = 9,345 N13.43 sec burnwhich equals 125,503 Ns 
total 308,576 Ns

Hmmmmmm.....

thanks...


steve




On Nov 30, 2011, at 12:49 PM, Wedge Oldham wrote:


Yes, absolutely!
Wedge
On Wed, Nov 30, 2011 at 8:15 AM, Allen Coleman <allencoleman46@xxxxxxxxx <mailto:allencoleman46@xxxxxxxxx>> wrote: 

    Can Metal Glaze by Evercoat be used to fill spirals in blue tube
    and other body tubes?

    Allen Coleman



    On Tue, Nov 29, 2011 at 6:28 PM, Wedge Oldham
    <wedgeoldham@xxxxxxxxx <mailto:wedgeoldham@xxxxxxxxx>> wrote:

        Metal Glaze by Evercoat.  Spreads as easy as mayo;  sands as
        easy as chalk.  Hardens in 20 minutes which is normally a
        good thing.  Sticks to everything but the break of day.

        On Nov 29, 2011 1:27 PM, "Troy Monroe Stacey"
        <tstacey001@xxxxxxxxxxxx <mailto:tstacey001@xxxxxxxxxxxx>> wrote:

            Bondo. There's a finishing Bondo that we used on Itsy
            Bitsy and I don't remember exactly what it was called,
            but it set up quick and sanded great and was awesome.
            Anyone from Team Tarantula still around know what I'm
            talking about?

            Sent from my iPhone

            On Nov 29, 2011, at 1:18 PM, Gregory Lyzenga
            <lyzenga@xxxxxxxxx <mailto:lyzenga@xxxxxxxxx>> wrote:



            On Nov 29, 2011, at 12:48 PM, Scott Christiansen wrote:


            Anyone have an easy way to fill pin holes in
            fiberglass? The less sanding the better.

            Scott


            If the holes aren't too big, I've found that wall
            spackle from the home improvement store works well and
            sands with almost no effort.

                    - Greg

Other related posts:

  1. Home
  2. roc-chat
  3. Archive
  4. 11-2011