If your download doesn't work, use google drive: https://drive.google.com/drive/folders/1lukbT7He7mFx0xf2uT2z5JtRkQCCP2En?usp=drive_link
Ragnarok is a free 3D printable jetsprint boat hull designed by M-Jet Development working closely with the M-Jet community, who did huge amount of work testing all Ragnarok versions.
Ragnarok is 550mm long, resulting in scale of around 1/7,3.
Ragnarok is designed for performance when used with the M-Jet 35. It does have some documentation but no full build video, you need to know what you are doing. When built well, can achieve 60kph, when taken to extreme, 79kph is the current Ragnarok speed record.
Ragnarok is compatible with M-Jet 30 and M-Jet 35
M-Jet 30: https://www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-3d-printable-jet-drive-for-rc-boats
M-Jet 35: https://www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-35-3d-printable-jet-pump-for-rc-boats
Development log:07.10.2023 V0: The first hull file was uploaded.
09.10.2023 V1: The hull has been splitted for printing. Geometry of the joints is partly taken from the Valkyrie, and partly inspired by solution in the Sprint. Flood chamber holes have been added. Turn fin mounts and trim tab mounts with new standard 16mm hole spacing (same as on Valkyrie) have been added. Pump interface for the M-Jet 35 has been added. Right now, the hull is printable and functional, even though it still misses many important features.
13.10.2023 V2: TPU Lid added. Rear wing with mounting points added. Small changes on the turn fin and trim tab mounts were done to achieve cleaner geometry. Flood chamber rear hole was modified for faster flow out.
16.10.2023 V3: Rear hull with interface for M-Jet 30 was added. Battery mount added. TPU lid for 220x220 print beds added. Increased size of the rear wing. Added mounting frame for the upcoming rollcage, pilots and engine.
20.10.2023 V4: Whole new rollcage was added. Rollcage gets printed in 4 pieces with no supports. Maximum strength is utilised thanks to all pipes lying in XY and not Z axis on the print bed. Geometry of the deck frame was changed a little bit, and the rear locks were changed to use M5x20 grub screw with locking nut, similarly to Valkyrie. However, the frame should be still 90% compatible with the Ragnarok V3.
26.10.2023 V5: Based on discussion with Sandro Flöry, the flood chamber size was increased by around 2mm. Big set of turn fins of various sizes was added. New receiver drybox with mount.
02.11.2023 V6:Big set of trim tabs.Infinitely stackable hull armour.New zip tie ESC mount.New bilge pump mount.File organization, fastener list. STEP file with colours:)
12.11.2023 V7: Turbocharged four rotor rotary engine inspired by Mazda 26B.The engine can be printed with no supports. The only part that got changed compared to V6 is the Rollcage_base, other than that, the engine is ready to be dropped in. There is a drawing showing which fasteners to use for the engine assembly.
26.11.2023 V8: Hull without flood chamber requested not only by Kai Reckleben was added. In conditions, where you don't need the self-righting at all, this only brings you advantages.Front bumper suggested by Ryan Frair was added, which can be mounted using a single M2x10. A helpful drawing showing assembly of the hull and fasteners used was added. Bilge pump mount was redesigned after discussion with Niklas Rösner. Two little holes to guide water out of the lid pool suggested by Joel Anderson were added.
5.1.2024 V9: Pilots were added. The hull was changed based on the idea of Ryan Frair and testing by Ryan and Lucygup Tham - the V-keel was extended, which has proven to provide better performance. Big thanks for your extensive testing work.The ESC and drybox mounts were removed, now there are glue-on mounts available instead. This enables you to use different mounting positions, and to mount the ESC to the back for possibly better CG balance.Flotation cutting template was added.
30.1.2024 V9.1: The screw alignment on the hull without flood chamber between the hull middle and hull rear was 1mm off. Thanks Joel Anderson for reporting this. The update 9.1 fixes this issue and changes the screw placement on both hull middle and hull rear of the floodchamber-less version. The floodchamber-less STEP file is updated too. No other files are changed.
15.02.2024: Upon a request, a rear wing without RAGNAROK text was added into the rear wing folder in V9.1.
08.03.2024 V10: Some people reported problems with self righting. To improve the self righting, height of the hull with flood chamber was increased by 6mm. This increases buyoancy on the top.After a discussion with Tom Hui Young, the area where trim tabs get mounted was beefed up to prevent cracks.Based on a suggestion from Michael Fre, the driver pilot was slightly modified to improve printability. Thanks everyone for your feedback!
13.04.2024 V10.1: Based on a kind suggestion by rc3dprinter, the issue with a mirrored drybox base was corrected. The O-ring for the drybox was added to the excel part list. The STEP file was updated with the corrected drybox. No other files were changed. Thanks for your feedback.
12.05.2024 V10.2: The lid files were all rotated and placed on the build plate, to make it clear how they should be printed. No geometry was changed.
05.08.2024 V10.3: A little issue with the Drybox base, where the pin was placed on the wrong side, was corrected. Thanks for reporting the issue.
05.09.2024 V10.4: A new Hull_rear compatible with the newest update of the M-Jet 30 has been added to the files. A modified deck knob for easier use by Sascha has been added too, thanks for sharing!
20.11.2024 New photos were uploaded to CGTrader, there are no changes to the files.
01.12.2024 V11: Highly improved documentation and full build video. Changed system of hull assembly, which removes majority of the issues caused by warping. This is achieved by flipping printing orientation of Hull front and introducing versions of Hull front with active warping compensation, which compensate for warping of Hull middle. Reworked turn fin mount in the style of Supersprint with one more (4th) slot. Mega turn fin set. Reduced printing overhang on the upper rear 45° plate of Hull rear.
17.12.2024 V11.1: There was an issue that the hull rear without flood chamber was missing holes for trim tab mounts. This is now fixed. The following files have been corrected: Nochamber_hull_rear_for_M-Jet_30, Nochamber_hull_rear_for_M-Jet_35, Nochamber_hull_STEP. Thanks Peno for reporting the issue!
