Hello All
I have managed to repair my pressure sensor with W40 and I have measured the
pressure for the following motors with ammonium perchlorate an potassium
perchlorate
38 mm 2 grains AP/Silicone with a 6.5 mm nozzle throat (see attached)
ð Pressure was 924 PSI
ð Burn time 0.8 second
ð H204 (163N) (previous tests were H206 and H224)
38mm 1 grain PP/Silicone with a 6.5 mm nozzle throat ( see attached)
ð Pressure was 544 PSI
ð Burn time 0.69 second
ð F114 (78N)
I did fire 5 time the 2 grains AP without any issue. I did a 3 grains with
an 8mm nozzle and had a cato
I did fire 3 time the 1 grain PP without any issue. I did a 2 grains with an
8mm nozzle and had a cato.
I will try a 1 grain AP with a 4.5 mm nozzle and will re-try a 3 grains with
a 9 or 10 mm nozzle
Not sure what to do with the PP, maybe reduce the amount of PP and or
replace some of it with nitrate.
I could also add some ammonium chloride with the PP to reduce the burn rate
and the pressure.
I cannot use any of the carbonate because the silicone does not dry.
I also have some silicone drying issues with copper oxide II and my friend
Philippe has issue with Zinc
So agin base composition we are using is:
AP or PP 72.74539113
lamp black 0.332170736
silicone 1 24.23185517
Silicone 2 2.69058296
I know that the mailing list is mainly for for sugar propellant but I am
looking for advices and help to control the burn rate and pressure
I will also post the videos for the tests later on
Regards
Boris
Attachment:
1 grains 38mm PP 8 mm core MotorCurve-08-07-2022_05_43_51.jpeg
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Attachment:
1 grains 38mm PP 8 mm core MotorCurve-08-07-2022_05_42_35.jpeg
Description: JPEG image
Attachment:
2 grains 38 mm AP 8 mm core MotorCurve-08-07-2022_04_48_44.jpeg
Description: JPEG image
Attachment:
2 grains 38 mm AP 8 mm core MotorCurve-08-07-2022_04_50_53.jpeg
Description: JPEG image
