Le Prieur Rockets

[William]

Steve,
I am perhaps wrongly assuming that this is the width of the flat. Of course since I'm making it up as I go along I'm more than willing to make it fit the tube. No, have no data on the tubes. If someone is near Shuttleworth perhaps they could examine theirs?
Regards,
William

Originally Posted by SCMc

William,

If the quote in my previous post is correct, the stick is square, not round. When you wrote 15 mm diameter, was that the distance across flats, or across corners?

A 14 mm wide square stick would fit snugly in a 20 mm I.D. (internal diameter) tube, with only about 0.16 mm tolerance. A 10 mm wide stick would fit in a 15 mm I.D. tube with almost 1 mm tolerance. Do you know the specifications of the launch tubing?

Steve

[William]

Sreiko,
I had forgotten about the Congreve rockets! They are certainly very similar conceptually. For the Le Prieur rockets 200 gms of "Ruggieri propellant" (aluminum based) was used. I have no clear idea about the comparative value as propellant with black powder but assume that it was more efficient and/or acted as an incendiary when they struck a Drachen or Zeppelin. No idea what their real or expected velocity was but willing to experiment .
Regards,
William

Originally Posted by Sreiko

In that time black gun powder was used as propellant and maybe this type of material was inside. That mean that max speed could be some 400 m/sec but hard to believe that this rocket with no stabilization and of small diameter could reach even half of that speed. One small regression- Soviet AA rockets Dvina and Neva used black gun powder cylinder as propellant and they reach supersonic speed...

[William]

Hello John,
We are also building a Pup, let me know if we can be of any assistance.
Regards,
William

Originally Posted by jbrecher

Let me know what you find on this as I'm building the Pup as a school project in Dallas. I plan the rockets on it.
John

[Sreiko]

Thank you for info about the metal ingredient As I know metal is used as accelerator of the burning of rocket fuel... but have to be check out about this specific weapon.

[tengew]

The aluminum also acts as an incendiary when mixed with magnesium you get thermite
Or any other metal dust helping to light the gas

[Sreiko]

Metals have great influence in the rocket fuel composition. Aluminum for example is also used in some Matra modern rockets and I think that amount was very high.

BTW- in this moment I model Nieuport 16 and kit include some rockets. Did it use it?

[TomVrille]

Originally Posted by Sreiko

Metals have great influence in the rocket fuel composition. Aluminum for example is also used in some Matra modern rockets and I think that amount was very high.

The principal purpose of using Aluminum in current propellants is to increase the flame temperature, resulting in increased specific impulse. The specific gravity of elemental Aluminum exceeds that of cured binder materials, resulting in increased density impulse for the propellant as well.

The use of Aluminum in military rocket applications has largely faded into history because of the excessive smoke signature that results. The dense clouds of white smoke that can be seen in non-military applications, such as the space shuttle strap-on boosters, is caused by Aluminum oxide particles which are highly reflective and extremely visible.

[Sreiko]

Hi Tom,

Soviet use some other method. For example I have seen cross section of the Strela 2M AA light rocket and they use copper wires through whole chamber. I have seen this in 1982 on seminar about rocket technology in the military rocket center in Belgrade. Also there I get datafiles for many of western rocket ingredients but that was long time ago and I have lost this material Anyway- use of metals are also to get high temperature in local area of burning and this help to increase total burning area. Also used method is the complex geometrical cross section of the fuel in chamber.

[SCMc]

Sreiko,

It appears that at least some N.16's were armes with Le Prieur rockets:

http://www.theaerodrome.com/aircraft...ieuport_16.php

Steve

[Sreiko]

Wow- thank you very much