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- From: barrett@add.itg.ti.com
- Newsgroups: rec.models.rockets
- Subject: Re: Other reloadables besides Aerotech?
- Date: 29 Dec 1992 20:12:20 GMT
- Organization: Texas Instruments Incorporated, Austin
- Lines: 35
- Message-ID: <1hqbf4INNl4@cuda.add.itg.ti.com>
- NNTP-Posting-Host: powder.add.itg.ti.com
-
- Buzz, this note to you bounced with a user unknown error????
-
- ----- Transcript of session follows -----
- >>> RCPT To:<buzz@rsd.dl.nec.com>
- <<< 550 User unknown
- 550 <buzz@rsd.dl.nec.com>... User unknown
-
- ----------------------------- Note follows -----------------------------
-
- >> The Aerotech 29/40-120 system uses 1, 2 or 3 propellant 'slugs' and
- >>cardboard tube spacers. Nothing is ever left 'loose' in the casing.
- >>This is the same for delay elements. You have thicker or thinner
- >>elements, depending on the delay time, and cardboard tubing to take up
- >>the extra space. The 18 and 24 mM reload systems are handled in the
- >>same manner. And by the way, there is twice as much propellant between
- >>the 29mm 'E' (40NS) and 'F' (80NS) reloads. However, the 'G' reload is
- >>only 120NS, not 160NS. It uses 3 of the propellant slugs versus 2 for
- >>the 'F'.
-
- Buzz, how do the cardboard spacers work? Do they keep the flame off
- of the top surface of the top propellent grain (assuming that the
- cardbord spacer is on top). How do you ignite the top propellant grain
- if it is not at the top of the casing?
-
- If the cardboard spacers are at the bottom, then ignition would be
- straight forward, but the bottom surface of the bottom propellant grain
- would be exposed to the flame.
-
- Either way, a strange burn profile would result. That may explain the
- wierd sputters that you hear with the Aerotech reloads (which I find
- annoying; reminds me of Jerry Irvine's motors).
-
-
- Stu Barrett barrett@add.itg.ti.com
- TRA#1277 NAR#4341
-