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by strud
Wed Nov 20, 2019 8:22 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Swirl injector for 4" hybird
Replies: 6
Views: 157

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: 6
Views: 157

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: 6
Views: 157

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: 1452

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: 1452

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: 2
Views: 105

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: 6
Views: 157

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: 6
Views: 157

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 ...
by strud
Tue Nov 12, 2019 10:00 am
Forum: Low Powered Rocketry
Topic: Green Tree Frog
Replies: 7
Views: 288

Re: Green Tree Frog

I'm jealous of the grass you have there!
by strud
Tue Nov 12, 2019 9:02 am
Forum: Support & Recovery & Misc.
Topic: GSE Update
Replies: 4
Views: 213

Re: GSE Update

Hi Matt

Sure, will document and video next usage :-)
by strud
Mon Nov 11, 2019 10:34 am
Forum: Support & Recovery & Misc.
Topic: GSE Update
Replies: 4
Views: 213

Re: GSE Update

Hi Matt, Will check but I currently have two types of plugs and they can have keying inserts installed. Haven't done that yet but would be a good idea. By the way, booster is not a vehicle booster rather a pressurant booster ie to pump from say 200 to 350 bar. The telemetry is not encrypted but I fe...
by strud
Thu Nov 07, 2019 1:12 pm
Forum: Support & Recovery & Misc.
Topic: GSE Update
Replies: 4
Views: 213

GSE Update

I think my post on this was blown away in a recent forum recovery from backup etc.... Anyway I've done some work on the Hybrid GSE to support larger more complex hybrids (potentially liquids), primarily in the area of telemetry and a new pendant. Telemetry is now using a more robust all binary packe...
by strud
Mon Oct 28, 2019 10:11 pm
Forum: How's the Weather..?
Topic: Bloodhound first run
Replies: 5
Views: 347

Bloodhound first run

I didn't think this was still a live project.... happy to be wrong



I note the Nammo label on there :D
by strud
Mon Oct 28, 2019 12:39 pm
Forum: Electronics
Topic: Sunlight readable TFT HMI
Replies: 1
Views: 238

Sunlight readable TFT HMI

Hi All Just ordered one of these to upgrade my hand held rocketry 'pendant' for GSE and rocket monitoring/tele-command system. https://www.newhavendisplay.com/nhd43480272ftcsxnt-p-9568.html Data sheet here https://au.mouser.com/datasheet/2/291/NHD-4.3-480272FT-CSXN-T-1219249.pdf Advantage over what ...
by strud
Mon Sep 23, 2019 8:45 am
Forum: NSW Rocketry Association
Topic: Testing F motors on loadcell setup
Replies: 5
Views: 493

Re: Testing F motors on loadcell setup

Sounds good to me !

The larger BP motors are more prone to failure ie over pressurisation, hence the plywood shield and being away from 'people' would be wise.

What DAQ system and loadcell are you using?

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