# [roc-chat] Re: Pesky Pin Holes

• From: Richard Dierking <redierking@xxxxxxxxxxx>
• To: "<roc-chat@xxxxxxxxxxxxx>" <roc-chat@xxxxxxxxxxxxx>
• Date: Wed, 30 Nov 2011 18:24:54 -0800
```I suggest www.thrustcurve.org

Sent from my iPhone

On Nov 30, 2011, at 6:11 PM, "David Erbas-White" <derbas@xxxxxxxxxxxxxxxx>
wrote:

> 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 N 7.48 sec burn
>>         which equals 183,073 Ns
>> 2nd Stage = 2100 lbf   which = 9,345 N 13.43 sec burn which 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> 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> 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>
>>> 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
>>>
>>> Sent from my iPhone
>>>
>>> On Nov 29, 2011, at 1:18 PM, Gregory Lyzenga <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
>>>
>>>
>>
>

```