Re: rocket tooling - angle of nozzle former ram

Lloyd,

What's the angle of your entry cone? 30-degrees?

--
Andy H.
"Clean Up or Die..."


On Mon, 30 Jan 2006 12:35:05 GMT, "Lloyd E. Sponenburgh"
<lloydsp@xxxxxxxxxxxxxx> wrote:

>
><hhc314@xxxxxxxxx> wrote in message
>news:1138581888.334256.206520@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>> Andy, if your speaking of a nozzle former, mine are made at 45-degrees
>> for both gerbs and rockets, but I doubt that the angle is particularly
>> critical.
>>
>> Harry C.
>>
>The angle can make quite a difference in performance.
>
>The purpose of a nozzle is to accelerate the expanding gasses to as fast a
>speed as possible, then to decelerate and expand the gasses to atmospheric
>pressure before they leave the bell of the exit cone. A DeLaval
>configuration comes closest to accomplishing this in a physical format that
>a gerb (rocket) former can match.
>
>The entry cone can be formed by contouring the tip of the clay rod.
>
>Making nozzles to a good approximation of the DeLaval geometry can gain
>15-20% in exhaust speed over a casually formed nozzle.
>
>An example of this would be our 22mm gerbs. The i.d. of the tube is 12.5mm.
>We get 8.5m plumes from these finger-sized items.
>
>LLoyd
>

.

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