Commit 15427335 authored by concreted0g's avatar concreted0g

3rd commit, adding pictures and documents

parent 0b56e9ce
After assembling the 4 top plates (3 ply and one G10) to make the top baffle plate (built heavy as it is the retaining bulkhead for the recovery system).. I realised the M4 lifting eye bolts I had didn't have a long enough threaded section. I had some M4 lifting eye nuts so could use a longer bolt epoxied through the baffle top plate. However this would be able to undo if the recovery bridle was rolling or turning and may unscrew the nut. To overcome this I made a small block to act as a drill guide and drilled a 1.1mm hole through the bolt and then after assembly could lock the ete nut on using a spring steel "R" clip.
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So assembling the baffle is carried out in a certain order with the upper plate with the recovery anchor eyebolt assembly glued into the top of the tube first.
Then the inner plates are added with epoxy (I painted mine a little and covered with epoxy to increase their lifespan and make them resist the hot gases better). Then the base baffle plate is added last. Before the baffle assembly is glued into the main body tube I added the recovery bridle. I used some 14.28mm military parachute tape that is easy to find at reasonable prices in the UK and performs well. As its a tubular nylon I opted to stitch a small sock of nomex cloth and stiched it into place covering the first 25cm or so of the nylon again to make it resistant to hot gasses. In a small diameter airframe it is easier to do this now than replace it!
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Hi.. thanks for looking at this project.
SO this rocket ODR (either pronounced Owther as in the mystical nordic force or O.D.R whcih can stand for Open Development Rocket) is an opensource design that can fly on 38mm motors and has been simulated on G through to I impulse motors. Therefore it could be used for mid power or high power rocketry and could be used to attain a Level one high power certification.
It is (as of 6th July 2018) as yet unflown but I am a moderately experienced rocket builder and have launch scratchbuilt designed and simulated rockets before. I will update when test flights have been achieved.
It is designed and simulated in OpenRocket which is open source and my design file is included in this repo. The openrocket application is available from http://openrocket.info/
The simulation/design file is mostly complete and is currently set up with 100g of payload mass in the electronics bay which includes some of the weight of extra components such as the threaded bar etc (see ebay notes). Many mass values are overridden in the simulation with the real mass of the components I have made.. it's a good idea to weigh your own components and override these values with real data.
There are many aspects of the desing file that are representative of the design rather than actual cad of the components.. feel free to dial it in more and push back to here!
All the 3d print files are made in the opensource OpenScad http://www.openscad.org/
****** IMPORTANT *******
The gcode files for cutting the various boards are set up for a 1.5mm endmill at a feed rate of between 450 and 550 mm per minute and are formatted for a machine running GRBL
The STL files (you can remake them using the openscad files) are tweaked and sized for my printers and the current shrinkage etc of my filament.. you may need to tweak to your own calibration!
Finally.. the main tubes for this are available in the UK (and can be shipped elsewhere) from https://blackcatrocketry.co.uk
I have no connection to them but have found both their service excellent and their phenolic tubes are really good quality.
So.. thanks again.. feel free to get in touch via gitlab or twitter @concreted0g
If you build an ODR please let me know!
Couple of general pictures of the electronics bay assembly (needs more documentation) and the laminated top plate for the baffle assembly made from 2 inner 3mm plywood baffle plates and 1 outer 3mm ply baffle plate and topped with an outer 2mm G10 baffle plate. The electronics bay has a length of M4 threaded bar through it onto which designs of sleds/shelves for avionics or other payloads may be added.
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