Search found 972 matches

by strud
Fri Jan 03, 2020 2:09 pm
Forum: How to's
Topic: Down Draft Table
Replies: 16
Views: 4117

Re: Down Draft Table

Looks very nicely done thus far!

Not hard to tell you are likely a perfectionist, which isn't a bad thing :-)
by strud
Wed Dec 11, 2019 8:42 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Swirl injector for 4" hybird
Replies: 13
Views: 3989

Re: Swirl injector for 4" hybird

:D

Struggling to get suitable conditions for a static test now..... if we can get some days of no wind and maybe a little bit of rain we may run a test early in the morning but it may be we have to wait until March/April to do the static now.... :(
by strud
Wed Dec 11, 2019 8:12 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Swirl injector for 4" hybird
Replies: 13
Views: 3989

Re: Swirl injector for 4" hybird

:D

Struggling to get suitable conditions for a static test now..... if we can get some days of no wind and maybe a little bit of rain we may run a test early in the morning but it may be we have to wait until March/April to do the static now.... :(
by strud
Tue Dec 03, 2019 3:30 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Swirl injector for 4" hybird
Replies: 13
Views: 3989

Re: Swirl injector for 4" hybird

Copper washers installed and injectors drilled to 1.6mm

Image
by strud
Thu Nov 28, 2019 7:59 am
Forum: Water Rocketry
Topic: Extreme horizontal application
Replies: 1
Views: 1594

Extreme horizontal application

This guys has a lot of ....well something !

Sitting on a high pressure tank as your seat is only part of his 'inventiveness'



Actually looking at the comments he may have 'passed on'..... not surprised I must say.
by strud
Sat Nov 23, 2019 11:12 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Swirl injector for 4" hybird
Replies: 13
Views: 3989

Re: Swirl injector for 4" hybird

Hi Matt, Combustion efficiencies have been shown to go from around 85% to to 95%, however to gain this much improvement a post combustion chamber/zone is required. Some example papers discussing this : https://www.researchgate.net/publication/285630278_Swirl_Injection_Effects_on_Hybrid_Rocket_Motors...
by strud
Fri Nov 22, 2019 4:06 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Swirl injector for 4" hybird
Replies: 13
Views: 3989

Re: Swirl injector for 4" hybird

Photos of a quick low pressure water flow test https://drive.google.com/uc?export=view&id=1wAmami_HlHDJpzIJ9uQXoYgusUqLT_zd https://drive.google.com/uc?export=view&id=1Vtf59mUzeAOmqxspwEsuHu0bvV-Ax4Th https://drive.google.com/uc?export=view&id=1DhjjTxfRFjsrAQFEaATWYQa1D7wZ0f2e These make...
by strud
Wed Nov 20, 2019 8:22 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Swirl injector for 4" hybird
Replies: 13
Views: 3989

Re: Swirl injector for 4" hybird

I hadn't planned to put any seal around those threads or under the bolt heads, but now that you've mentioned it and I've thought about it a bit more I may put a soft copper washer or similar under the bolt heads. The leakage through the thread would likely be insignificant but if there was any flow ...
by strud
Wed Nov 20, 2019 1:08 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Swirl injector for 4" hybird
Replies: 13
Views: 3989

Re: Swirl injector for 4" hybird

Drilled at 1.5mm and entry chamfered https://drive.google.com/uc?export=view&id=1Dovqxtvor1h4Y9oNCQp71X_vXQMx7_lh https://drive.google.com/uc?export=view&id=1KzPtPZchfXwzQwIPddW6XlzxQdwZqOW6 https://drive.google.com/uc?export=view&id=1mztgO2CZ5Xi30OkRCzkk1o8RZtASaGW5 https://drive.google...
by strud
Tue Nov 19, 2019 6:36 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Swirl injector for 4" hybird
Replies: 13
Views: 3989

Re: Swirl injector for 4" hybird

Have the brass bolts now, hope to get some time to drill & chamfer these shortly

Image

Image
by strud
Sun Nov 17, 2019 4:04 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Vent Sensor
Replies: 9
Views: 2320

Re: Vent Sensor

Hi Voyager, That sounds very comprehensive, should be no doubt where you stand prior to pressing the bit red button :D I'm planning on having more high level metrics and auto checks with my GSE interface such that when you or someone else is in the process of filling and firing, you are less likely ...
by strud
Sun Nov 17, 2019 7:05 am
Forum: Hybrid - Crossbreeding Rocketry
Topic: Vent Sensor
Replies: 9
Views: 2320

Re: Vent Sensor

Hi Voyager, Any luck implementing this method? Wondering if you've come up with a reliable setpoint and target? Of course the most reliable approach is to monitor the mass delta so you know exactly how much Oxidiser has been transferred. More complex I guess but if you have a wireless GSE system the...
by strud
Sat Nov 16, 2019 11:54 am
Forum: Scratch Built
Topic: Modular Rocket
Replies: 4
Views: 1329

Re: Modular Rocket

I like modular approaches, reuse saves time and reduces risk in new projects.... theoretically.

M1.6 fasteners, wow didn't know they existed!
by strud
Fri Nov 15, 2019 4:05 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Swirl injector for 4" hybird
Replies: 13
Views: 3989

Re: Swirl injector for 4" hybird

Yes want to do this anyway.

Water flow is obviously not the same but will give some idea......
by strud
Fri Nov 15, 2019 12:10 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Swirl injector for 4" hybird
Replies: 13
Views: 3989

Swirl injector for 4" hybird

So after a significant amount of review of the literature around hybrid motor stability, I've decided to make some changes to the design of the 4" motor. One thing that was found to significantly help reduce instability that was not fuel related is the addition of swirl to the oxidiser flow ie ...

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