GSE Update

Discussion on ground control/GSE and recovery equipment. This includes launch pads, triggers, chutes, streamers etc. Includes other items such as simulation and other computer software, etc.

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strud
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GSE Update

Postby strud » Thu Nov 07, 2019 1:12 pm

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 packet format and new radio modem modules using RFM23BP radiomodems + PIC18F26K22 uC running my modem code.

Pendant front
Image

Pendant internals
Image

GSE box outside
Image

GSE box internals
Image

Image

Vehicle/Motor interface hardware
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Example test stand arrangement
Image


And a bit of a summary video


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SpaceManMat
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Re: GSE Update

Postby SpaceManMat » Sun Nov 10, 2019 3:51 pm

Nice setup Strud.

Couple questions -
Is it possible to put the wrong plugs in? Like get booster confused with ignition?
Is the controller encrypted or some other safety mechanism to prevent accidental firing?
Could you please tell us more about your liquid fuel plans?
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 13,647 feet
Fastest Flight: Mach 1.55
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

strud
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Re: GSE Update

Postby strud » Mon Nov 11, 2019 10:34 am

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 feel the risk to me having an unwanted packet coming in is very very low.
Firstly the radio configuration is custom ie pre-amble length, air bit rate, modulation width etc are likely unique.
Secondly the transmit and receive headers (which act as filters) are also non-default so if someone else somehow had the same radio config and the same channel, they would also need to have the same 4 byte header to make it through the radio packet engine filter.....let alone getting a packet protocol that would match one of mine ie if the packet type does not match one of a std list I have defined, the packet is rejected also.

No specific liquid fuel plans at this stage, other than to include the valving and channels to support it. Once you go down the path of supporting pressurants etc, adding these bits for a liquid fuel is not such a big deal. The pressurant capability was added to support approaches such as chilled N2O + Dissolved O2 (Nytrox) in which case the O2 would be considered the pressurant (albeit only at 69bar).

I think a good improvement to this arrangement would be to move the Ox and Fuel valves + actuators to a separate plate that can be mounted right near the vehicle. That way I can eliminate the risk of an Ox &/or fuel leak into the GSE control box :-)

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SpaceManMat
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Re: GSE Update

Postby SpaceManMat » Mon Nov 11, 2019 10:13 pm

Fair enough. We’d all like to see it in action of course.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 13,647 feet
Fastest Flight: Mach 1.55
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

strud
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Re: GSE Update

Postby strud » Tue Nov 12, 2019 9:02 am

Hi Matt

Sure, will document and video next usage :-)

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Re: GSE Update

Postby strud » Sat Apr 18, 2020 10:54 pm

A few more updates, this time to the test stand.

I have split the motor radial support 'rings' so that the motor and associated 'attachements' can be loaded and unloaded from the stand without the need to feed it through them. A massive improvement of the whole test stand setup experience I can tell you.

Supports open, note also load cell mount also through slotted so load cell can be dropped in/slid in

Image

Image

Supports closed

Image


Next the addition of an exhaust plume diverter. So many videos of static tests are just a big cloud of dust and debris due to the exit plume digging a hole in the ground etc, so I decided to do something about it for this stand.

Image

Image

Image

Hopefully a video of the whole lot in action will be coming shortly.

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SpaceManMat
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Re: GSE Update

Postby SpaceManMat » Sun Apr 19, 2020 2:23 pm

The diverter is a pretty cool addition 8) Is this a horizontal test rig? If it’s vertical then you have to worry about the trust pushing the rig over with a diverter.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 13,647 feet
Fastest Flight: Mach 1.55
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

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OverTheTop
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Re: GSE Update

Postby OverTheTop » Sun Apr 19, 2020 6:11 pm

Nice work strud! 8)
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strud
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Re: GSE Update

Postby strud » Sun Apr 19, 2020 10:36 pm

So I gave the stand and GSE a test run today and pretty happy all up.

I used the trusty tractor to take all the bits down to the 'big tree' and set it up:

Tractor load 1
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Tractor load 2
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Stand without motor
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Motor on stand
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Ignition pic
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Stand, diverter and GSE worked well, although unfortunately I did discover an issue in my GSE logging firmware that allows the logger to wrap around and overwrite data..... :-(

Will comment on motor test in another thread, but sufficed to say it went mostly well, with no unexpected disassembly.

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SpaceManMat
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Re: GSE Update

Postby SpaceManMat » Wed Apr 22, 2020 9:40 pm

How big is the log? I’m guessing your not using an SD card, how long does it take to fill?
Still I guess lots worked right, just need to refine it a bit more.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 13,647 feet
Fastest Flight: Mach 1.55
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

strud
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Posts: 1005
Joined: Thu Oct 02, 2008 7:37 am
Location: Central Tablelands, NSW

Re: GSE Update

Postby strud » Tue May 05, 2020 3:01 pm

Hi Matt

Sorry to miss your reply

Flash memory log is 4M Bytes.

1.2mm drill bits have arrived so can make up the new injectors now....

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Voyager
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Re: GSE Update

Postby Voyager » Fri May 08, 2020 2:32 pm

Good stuff Strud. I wish I had your space for testing my hybrid setup.
TRA 14574 L2 (CRG)
AMRS 199 L2 (NSWRA)


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