Kyosho Ultima RT5 Chassis Service Pack "REV7"

Description

READ THIS! Important information: RESPECT THE LICENCE! You cannot make money with this! Its my countless hours of hard work poured into this project, all so i could offer this free for you to use in your personal use. If i see anyone trying to make money with this, like somebody tried in ebay with my previous designs, legal actions will be taken against those licence violations. I designed this custom chassis plate and conversion set (kind of Service Pack) for those who still have Kyosho Ultima RT5, but would like to use it in midmotor or laydown configuration. I´ve also added support for sideways battery, for those who might need that option as well. I call this "REV7". My custom chassis plate supports all original Kyosho gearbox styles. 3 gear rear motor, 3 and 4 gear rear and midmotor, and also a laydown gearbox. This set includes: - Main chassis plate - Rear chassis plate - 3D printable laydown motor mount plate with integrated spur gear protector (drill additional screw holes yourself if you need those). - Chassis support cradle for rear motor configuration - Chassis support cradle shim - Custom rear motor bulkhead - Custom midmotor bulkhead - Custom rear shock tower (same part is compatible with rear motor and midmotor configurations). - Midmotor waterfall brace - Custom front upper plate - Custom front bulkhead - Custom front steering bellcrank arms (use stock RT5 ball bearings in these) - Custom front steering bellcrank link (you need 3x7x3mm ball bearings for these) - Steering bellcrank bearing height shims - Custom front bumper - Custom front lower chassis plate - Rear motor inline battery tiedown plate Chassis details: - Stock length (if you want to use this with RB5, you need to slice it 23mm:s shorter to have stock RB5 length) - Support for midmotor standup - Support for midmotor laydown - Support for rear motor - Support for inline 3S is rear motor configuration. - Support for inline 2S shorty packs for midmotor configuration (if you want inline 3S with LD, you need to use low profile steering servo). - Support for sideways 2S shorty packs in all gearbox configurations. - Supports stock RT5/RB5/SC gen1 front end parts, except for the front upper plate. If these parts are used, the steering servo position needs to moved from the front to the back. Newer generation parts are not compatible due the difference in chassis material. - Chassis flex is adjustable with multiple different ways. Supporting parts infill, material, adjustable flex plate system, using different body posts and battery tie down options. - Design pretty much optimized for 3D printing, so the parts are also durable and usable. What extra parts are needed? You need different length of 5mm OD M3 aluminum chassis body posts from ebay: https://www.ebay.com/itm/224390616069?hash=item343eb91405:g:~b0AAOSwCy1gUsri This comes from my memory, but you need: 2 pcs of 15mm posts for steering arms. (stock aluminum posts are not compatible, i didnt have those, so design is missing compatibility for that hex end of the stock posts). 2 pcs of 25mm posts for front upper plate middle points. 2 pcs of 20mm posts for front upper plate rear points. 2 pcs of 30mm posts for midmotor waterfall brace. 4 pcs of 20mm posts for rear motor configuration rear battery tie down plate (or 2 if you want more flex). I would advice for just ordering enough of anything, so you can fiddle around with different battery heights etc. These are cheap. You also need heat pressed M3 brass inserts: https://www.ebay.com/itm/203608961927?_trkparms=ispr%3D1&hash=item2f680a3387:g:VbAAAOSwCs1hRFt0&amdata=enc%3AAQAGAAACsPYe5NmHp%252B2JMhMi7yxGiTJkPrKr5t53CooMSQt2orsSjVt3vLKCbov98Z19qhuwYx1SHgZvoQX%252FMp4X20rdzrhaBOvNx9euEsu11jyWRazgwqGKX1IsYB7DPyBlnRyOm%252B%252BfcA%252FBkjjLPItnnoAQwmnBHpOhUaorIG3iXipptn251OoVmZfiLr8uudHo3aM4PrlAl%252BuEjPR4zDR6m9Imk7SWBqCPCa72EzLIFWdMkuz2IxQs4J1H%252FqWen1nz1PsDlktjZ2HXyY4vUyOt2v8RvOqVgofBqgaVYiWgBkJlEklnf6yTTlyJBm8d2wtEuH2jhaOLQ0HbtIYk1JZq%252BiJ2%252BMTH5PduKQC0W1rn%252BNZ82sGGROpAkjTIsZcr%252FC8KDDZ7diQuseU9wSeF6I3tcQxW5lgM%252B5rNjYZAa8PhbBhUfZMbFOsM1H5W9xiT5XzI8MFUU9xDsxsCpRbUF8HAhjvljCU51y1PcRyC5ZDCuVlUnzJfuHK74uR372tOZkRM1XihdzFXQ7TcsDwOhaamQBF9DyzPVD8ifdKbcTzXoCBzW5h1M7oPDUHvwhuIQjnmCy9dnVbhVX6S3alhxmD0Xjzl8XGobi5IC5WRQ0Uz0k0GX70k5iJPxzY9rF4JkjRg5b%252Bo0Hl%252FsMieJPHH8OfjsJyAl4WuoPhI8aMiM%252FKN5xD8PRIeRwD%252FELV9Ndfzftx%252FWf%252BQLJ2xXvJdgpN8TWgmiZkVKokhXA5S0KoPK7Qi7MXBSe4Smm%252B2r%252BuFiBqzjubOSrwF2Sx16JGHKg0b%252F2kyIpBz3laYC5CvB1oHWIS77K58xMXwloKTyM6eSSYovGVVWdhj3M8PHKTsOP6u%252BJ%252FHpXn40Hfd8Laa6Pgnkf55p4PMIbbAjPUIXkdT6kkbUjj8eXux5dynZXIt95x5r7Re1ZBO9%252FA%253D%7Cclp%3A2334524%7Ctkp%3ABFBM6pO-qaxf You need 2 pcs of those inserts to rear chassis (3mm height, M3 thread, slightly over 5mm of od.) And, you need 2 pcs of those same inserts to front bulkhead. The screw which bolts through the upper plate to the front bulkhead needs these, as otherwise the forces will tear the screws off from the printed material. For the servo arm, only the arm from this set is compatible because of the space limitations: https://kyosho.fi/spare-parts/2906-servo-saver-zx5-fs2-sp-rb5-sp2-wc.html You also need stock RT5 bearings for the steering arms. And also 2 pcs of 3x7x3 mm bearings for ackerman link. If using laydown, you need laydown gearbox compatible rear suspension hinge pin front holder (stock Kyosho holder that comes with LD gearbox), or then you need to shave the rear motor front hinge pin holder, so it clears the laydown gearbox. I can only guarantee the dimensional accuracy of the holes and designed chassis flex if you print this with Formfutura CarbonFil Black PETG/CF. You can probably get away with some parts printed from different material, but thats up to you. Nylon CF is also okay, but its hard to print. The filament im using: https://www.3djake.fi/formfutura/carbonfiltm-black You also need to have RT5 for this conversion. The design is missing: - Midmotor rear bumper. - Battery tie down (as im designing an adjustable option for it). - Rear body holders (need a custom design). - Sideways battery holder battery straps (those flaps that you turn on top of the battery so its held on). - Adjustable chassis flex plate system is still work in progress. Chassis already has a support for these plates, but the plates need some work. - Steering ackerman link doesnt have capability to swap it around to adjust ackerman. Its impossible to do that option with 3D print. So option is that you use stock RT6/RB6/SC6 ackerman link, or wait for me to design 2 different links to adjust ackerman. This same ackerman link in this design has 0,2mm of clearance problem with the chassis front lower plate. Its a known defect in a design, but you can easily shave of some material from the ackerman link or the lower plate for it to clear it, or wait for me to fix it in design. But yea, its already driveable and the main chassis design isn´t changing from this. If the parts in your slicer look to be in a strange angle, flip it 28 degrees (thats the front bulkhead kickup angle) in x axle and then after that either 90 or 180 degrees for your preferred printing orientation for the part. Design and build thread: https://www.rc10talk.com/viewtopic.php?f=30&t=46687&p=529096#p529096 And other thread: https://www.rctech.net/forum/electric-off-road/1092568-ultima-rt5-3d-printed-custom-upgrade-chassis.html Edit: 28.11. Added front wheel bearing/steering hubs for the package, because you need SC6,RT6 or RB6 style hubs for steering geometry to be correct. You cannot use RT5 stock hubs. C-hubs should be fine from RT5, but if you want to have more adjustability, use RT6/SC6/RB6 hubs. Edit: 17.12. The front shock tower is a known weak point when doing jumps (with bad landings) with this chassis. The 3D-printed front shock tower will snap half just over the 4 screws where it attaches to the front upper plate, if the shock will bottom out during hard landing. I will fix this with reinforced design when i have some time. If you want a quick fix, use stock Ultima RT5 front shock tower. Edit: 19.12. Added new shock tower design to the package. "REV7 Front Shock Tower Reinforced". Use this instead of the old design. This should fix the cracking problem with hard landings where the shock bottoms out.

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