[sugpro] end burner motor

From: Nikolai Nielsen <nielsen.nikolai86@xxxxxxxxx>
To: sugpro@xxxxxxxxxxxxx
Date: Mon, 8 Oct 2018 18:32:40 +0200

(re sending because sugpro said message was too big)
i have just completed a successful test of an end burner motor using
sucrose and brown iron oxide. i found that the smallest nozzle diameter
could be 5.5mm and the pvc pipe is schedule 40 40mm OD. The fuel mix was a
standard 65/35 ratio using 1% brown iron oxide. the punt depth is 5 mm. The
fuel was cast on the motor tube which is causing some problems with the
fuel that is up against the cement nozzle, absorbing the moisture from it
but i am still working on waterproofing the nozzle on the inside to protect
the fuel, im thinking a two part adhesive should do it but i don't have
anything like that i can use that isn't expensive. I considered wax but the
hot fuel would melt it away. The nozzle and fuel are separated by a small
amount of homemade gun cotton(nitrocellulose) which serves to create a
space for the flame to burn the fuel as soon as the gun cotton catches fire
which allows the fuel to burn from one side to the other instead of the
fuel burning just from the point of ignition and radiating out. the length
of the fuel grain was about 5-6 cm, i didnt measure it as it isnt that
relevant for an end burner. Without a washer on the nozzle, the erosion
would open the nozzle about 5x wider so i drilled a 5.5 mm hole in a small
square of sheet metal and placed it on the nozzle mould in the image below.
ive also included the motor test video
https://photos.app.goo.gl/mfjuKtFY9AD8XHxf7
[image: 1 boi.png]
Nikolai Nielsen

[sugpro] end burner motor

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