Translated SNECMA Documents

[NanoSoft]

Well I have finally found time to post what I have translated so far. It’s all in word format. There are going to be some errors and some parts won't make total sense but its still very informative. Enjoy

Nanosoft

[NanoSoft]

The author briefly exposes the preliminary results of the studies undertaken on an engine without valve, with drawn combustion influenced by the frequency of the frontal shock wave, with passage to the continuous mode, whose gamine speeds reaches Mach 0,9.

[NanoSoft]

S.N.E.C.M.A. PULSE-JET "ECREVISSE" STANDARD A. TECHNICAL DOCUMENTATION

[NanoSoft]

We propose today to speak in detail about a particular class of these engines, which one generally indicates by the name of "pulse-jets".

[NanoSoft]

Derived at the same time from Atar and the Vulcan, the first prototype of Vesta R 105 turns to the bench October 1954. Delivering a push of 1200 kgp.

[NanoSoft]

They describe the guiding principles of Escopette, Ecrevisse, the machines careened for propulsion of planes targets, of the pulso-stato groups and finally of the machine with extinction D shock waves able to function in the vicinity of the speed of sound.

[NanoSoft]

The principle of operation of the pulsejets is the self-sustained resonance of a gas column in a tube of which the proportions length compared to the diameter are well defined.

[NanoSoft]

Improvements with the rooms with pulsatory combustion for apparatuses with combustion.

[NanoSoft]

Device of air intake for thermo propulsive conduits with periodic combustion.

[NanoSoft]

The present invention aims at an apparatus offering, with the passage of a gas current, very different pressure losses, whose report/ratio can reach 1 to 10, according to the direction in which the gas crosses it, this apparatus not comprising any mobile machine parts.

[Mike Everman]

Thanks so much, Mikhail! I can't wait to read it all! Good luck with winding up school.

[Mike Everman]

"The increase in the performances of push was then slow but continuous, the maximum push passing, for the same dimension of combustion chamber, of 1,5 kg at the beginning of 1948 to 5 kg at the end of 1949, then at 10 kg in, the first months of 1950."

A passage on the 448 doc.


Ah, that passage and a glass of Porto, watching Spider-Man on dvd. Niiiice.

[Bruno Ogorelec]

God bless you, Mikhail.

[hinote]

They describe the guiding principles of Escopette, Ecrevisse, the machines careened for propulsion of planes targets

Here's a pretty remarkable statement, taken from the tanslation:

<The Company Hiller Aircraft, while using a pulso SNECMA in combination with bodies of dilution of its manufacture, managed to obtain a consumption specific of fuel lower than 1 kg /kgp /h for a push exceeding 220 kg to the fixed point.>

From this I can only assume that Lockwood (while working for Hiller) used a SNECMA pulsejet, and after adding augmentors achieved a TSFC of less than 1.0.

An amazing number. It just proves to me that we shouldn't be re-inventing the wheel here. If we can just unlock the secrets already developed in the 1950's we can have really competitive pulsejets.

That's nearly 500 lbf, with good fuel specifics. No moving parts. Somebody's going to be interested in numbers like that!

Bill H.
Acoustic Propulsion Concepts

".......some day soon we'll be flying airplanes powered by pulsejets."

[NanoSoft]

It is towards 1955 that the SNECMA was brought to studies of ramjets closely connected to answer, on the one hand with the future requirements of the propulsion at great Mach and, on the other hand, within the framework of an approach for an application on a large scale on the experimental plane on takeoff and landing with the Coleopter vertical.