# Natural rail hunter's jump: Natural rail horse jump plans [View illustrated instructions](https://diyplans.org/plans/natural-rail-jump-6014/variants/standard) [Plan and other configurations](https://diyplans.org/plans/natural-rail-jump-6014.md) Two 54-inch standards frame six 120-inch pole bodies. Each standard now has a 36 x 36-inch four-arm base, with a board on every post face and illustrated through-bolt connections. The same support arrangement is present when all poles are removed. This is a visual design reference, not a construction plan. ## License [CC BY-NC-SA 4.0 International](https://creativecommons.org/licenses/by-nc-sa/4.0/). You may share and adapt this free design for noncommercial purposes with appropriate credit, a link to the license, an indication of changes, and the same license on adaptations. See [the FAQ](https://diyplans.org/faq#license) for details and exceptions. Revision: 6 Status: published Difficulty: intermediate ## Before you start - Design inspiration with dimensioned concept geometry and illustrative connections; no established load, tipping or riding-use rating. - The base provides a wider geometric support footprint in both axes. No tip-load threshold, impact safety, anchorage capacity or riding-use approval is established. - Base holes and hardware are an illustrative attachment layout, not selected structural products. Threads, material grade, tightening and connection capacity are unspecified. - The poles remain body-only geometry. Closed post slots would retain upper rails; the model does not establish a freely falling rail system. - The 126 in pole blank remains provisional. Flush full-depth ends through 3 1/2 in posts would require 127 in before allowance; neither is a final rail joint. ## Dimensions - Clear opening between posts: 120 in. Illustrated geometry; footprint is a bounding extent, not a capacity rating. - Post height: 54 in. Illustrated geometry; footprint is a bounding extent, not a capacity rating. - Each base, left to right: 36 in. Illustrated geometry; footprint is a bounding extent, not a capacity rating. - Each base, front to back: 36 in. Illustrated geometry; footprint is a bounding extent, not a capacity rating. - Individual arm length: 19 3/4 in. Illustrated geometry; footprint is a bounding extent, not a capacity rating. - Overall assembly length: 159 1/2 in. Illustrated geometry; footprint is a bounding extent, not a capacity rating. - Highest illustrated rail top: 48 in. Illustrated geometry; footprint is a bounding extent, not a capacity rating. ## Shopping list Indicative timber allocation and illustrated connector quantities only. Selected hardware products, coatings, ground anchors and installation materials are outside this reference. - 1 board: 4 x 4 lumber, 10 ft. Two 54 in post blanks; allow saw kerfs and end trimming. - 6 pole: Sound natural poles, 3-4 in diameter, At least 11 ft. 126 in provisional blanks. Species, defects and final pole-end geometry are not specified. - 2 board: 2 x 6 lumber, 8 ft. Four 19 3/4 in arms per board total 79 in, plus 3/8 in for three interior kerfs; eight arms total. - 8 bolt: Illustrative through bolts, 3/8 in; 7 in under head shown. Generic unthreaded envelopes. Dimensions illustrate the attachment; select actual hardware separately. - 16 washer: Illustrative washers, 1 in OD x 1/16 in thick shown. Two per bolt; 7/16 in modeled bore. No manufacturer specification or capacity assigned. - 8 nut: Illustrative nuts, 3/8 in; 5/16 in thick shown. 9/16 in flats in model, no threads. Verify actual thread engagement and compatibility. ## Materials in the model One illustrated assembly: 16 timber components and 32 generic hardware envelopes. Not a selected-product construction bill of materials. - 4 x 4: 2 installed pieces - 2 x 6: 8 installed pieces - Illustrative 3/8 in bolt: 8 installed pieces - Illustrative 3/8 in washer: 16 installed pieces - Illustrative 3/8 in nut: 8 installed pieces - Natural pole, 3-4 in diameter: 6 installed pieces Not quantified: - Indicative timber allocation and illustrated connector quantities only. Selected hardware products, coatings, ground anchors and installation materials are outside this reference. ## Tools and equipment - FreeCAD for editing the native solid model - STEP-compatible CAD software for exchange geometry ## Instructions ### 1. Read the four-sided base - Each standard has one 19 3/4 in arm on each of its four faces. The arms rotate around the post in a pinwheel, giving a 36 x 36 in bounding footprint without crossing boards. All arm bottoms and the post base share the ground plane. Check: Find four arms on each standard, with support extending in both horizontal directions. ![One natural rail jump standard with four support arms](https://diyplans.org/media/packages/766a6fd596ec67c6e6ae661fca4a8a02ddbee3237e8741b11306380db402c306/standard-image/natural-rail-jump-r6-isolated-standard.png?brand=1) One complete standard. Its base spans 36 in in both directions. ![Four-arm base plan and tapered arm dimensions](https://diyplans.org/media/packages/766a6fd596ec67c6e6ae661fca4a8a02ddbee3237e8741b11306380db402c306/base-layout-image/natural-rail-jump-r6-base-layout.png?brand=1) Pinwheel layout avoids crossing boards. Each arm is 19 3/4 in long and touches the ground. ### 2. See the standards without poles - The poles-removed view shows both complete standards. Their four-arm bases and depicted through-bolt attachments are unchanged by pole removal. Ground contact is the four narrow arm strips and post, not a solid square platform. Check: Identify the clear gap between the two independent bases and the flat contact beneath every arm. ![Both natural rail standards with every pole removed](https://diyplans.org/media/packages/766a6fd596ec67c6e6ae661fca4a8a02ddbee3237e8741b11306380db402c306/poles-removed-image/natural-rail-jump-r6-poles-removed.png?brand=1) Four arms and their base attachments remain on each standard when the poles are removed. ### 3. Inspect the illustrated base connections - Each standard has four bolt sets. The X-directed axes are 1 1/4 and 3 1/4 in above ground; the Y-directed axes are 2 1/4 and 4 1/4 in above ground. Each axis passes through two opposed arms and the post, a 6 1/2 in wood stack. Check: Locate two bores in each arm and check that the perpendicular bore pairs sit at different heights. ![Base connection close-up with staggered bolt and bore dimensions](https://diyplans.org/media/packages/766a6fd596ec67c6e6ae661fca4a8a02ddbee3237e8741b11306380db402c306/base-detail-image/natural-rail-jump-r6-base-connections.png?brand=1) Illustrative through-bolt connections. The close-up crops the post above 10 in; no load rating is assigned. ### 4. Compare the unchanged rails - The six 120 in pole bodies have tops at 18, 24, 30, 36, 42 and 48 in. Uniform 3 1/2 in CAD cylinders represent the 3-4 in natural-pole range. Pole ends, post slots and release hardware are not modeled. Check: Distinguish the new base connections from the still-unspecified rail connections. ![Front and end elevations of the natural rail jump](https://diyplans.org/media/packages/766a6fd596ec67c6e6ae661fca4a8a02ddbee3237e8741b11306380db402c306/dimensioned-image/natural-rail-jump-r6-dimensions.png?brand=1) Overall dimensions and the assembly with poles removed. ### 5. Explore a separate variation - Use the native CAD to study proportions, finishes or base details. Individual solids are editable; the dimension sheet is informational. Update drawings and quantities together if you change the geometry. Check: Save a separate copy and record the dimensions changed. ## Drawings and views ![Natural rail horse jump with four-arm bases](https://diyplans.org/media/packages/766a6fd596ec67c6e6ae661fca4a8a02ddbee3237e8741b11306380db402c306/overall-image/natural-rail-jump-r6-overall.png?brand=1) Six unchanged pole bodies between standards with support on all four post faces. ![A horse and rider clearing the natural timber rail jump.](https://diyplans.org/media/packages/e7739164e5e9a600efbe5a0e5d18113c2e54720ed55db3a4b4434d77693cd330/cad-lifestyle/lifestyle.png?brand=1) A horse and rider clearing the natural timber rail jump. AI Generated from CAD files for inspiration ![Front and end elevations of the natural rail jump](https://diyplans.org/media/packages/766a6fd596ec67c6e6ae661fca4a8a02ddbee3237e8741b11306380db402c306/dimensioned-image/natural-rail-jump-r6-dimensions.png?brand=1) Overall dimensions and the assembly with poles removed. ![One natural rail jump standard with four support arms](https://diyplans.org/media/packages/766a6fd596ec67c6e6ae661fca4a8a02ddbee3237e8741b11306380db402c306/standard-image/natural-rail-jump-r6-isolated-standard.png?brand=1) One complete standard. Its base spans 36 in in both directions. ![Both natural rail standards with every pole removed](https://diyplans.org/media/packages/766a6fd596ec67c6e6ae661fca4a8a02ddbee3237e8741b11306380db402c306/poles-removed-image/natural-rail-jump-r6-poles-removed.png?brand=1) Four arms and their base attachments remain on each standard when the poles are removed. ![Four-arm base plan and tapered arm dimensions](https://diyplans.org/media/packages/766a6fd596ec67c6e6ae661fca4a8a02ddbee3237e8741b11306380db402c306/base-layout-image/natural-rail-jump-r6-base-layout.png?brand=1) Pinwheel layout avoids crossing boards. Each arm is 19 3/4 in long and touches the ground. ![Base connection close-up with staggered bolt and bore dimensions](https://diyplans.org/media/packages/766a6fd596ec67c6e6ae661fca4a8a02ddbee3237e8741b11306380db402c306/base-detail-image/natural-rail-jump-r6-base-connections.png?brand=1) Illustrative through-bolt connections. The close-up crops the post above 10 in; no load rating is assigned. ## Downloads - [Editable FreeCAD model](https://diyplans.org/downloads/packages/766a6fd596ec67c6e6ae661fca4a8a02ddbee3237e8741b11306380db402c306/native-model/natural-rail-jump-r6-model.FCStd): FCStd, 59716 bytes, file revision 6. 48 editable solids: posts, arms, pole bodies and illustrative base hardware. Informational dimension sheet. SHA-256: 2e4768ffe50a019a0cb825ac2054c0c5893e8548503d0c81a4c33dfa42839243 - [STEP model](https://diyplans.org/downloads/packages/766a6fd596ec67c6e6ae661fca4a8a02ddbee3237e8741b11306380db402c306/exchange-model/natural-rail-jump-r6-model.step): STEP, 366006 bytes, file revision 6. Matching exchange geometry with four-arm bases, post bores and generic connector envelopes. SHA-256: e3b703017b019b401986eb59521b22e3778f9fdb5e8b9c4fac5ace343d55dd2b - [Timber part sizes CSV](https://diyplans.org/downloads/packages/766a6fd596ec67c6e6ae661fca4a8a02ddbee3237e8741b11306380db402c306/cut-list/natural-rail-jump-r6-cut-list.csv): CSV, 796 bytes, file revision 6. Two posts, six provisional pole blanks and eight tapered support arms. SHA-256: 93a9af8a59cf1b951b634f38932c04b54d8e18ccff7647ffefb25e75f8c44213 - [Indicative materials CSV](https://diyplans.org/downloads/packages/766a6fd596ec67c6e6ae661fca4a8a02ddbee3237e8741b11306380db402c306/shopping-list/natural-rail-jump-r6-materials.csv): CSV, 1585 bytes, file revision 6. Timber stock allocation and counts for the illustrated bolt, washer and nut envelopes; actual products are not selected. SHA-256: 469c4c2435d4d2de22fccd61b17b00f9224b11cfd6381d4131a966a8a40339a3 - [Component schedule CSV](https://diyplans.org/downloads/packages/766a6fd596ec67c6e6ae661fca4a8a02ddbee3237e8741b11306380db402c306/parts-list/natural-rail-jump-r6-components.csv): CSV, 16291 bytes, file revision 6. 48 individual modeled solids, with bounds, volumes, material roles and notes. SHA-256: 562937ce619a75151f5840376410c92dbcba45260f49e40f13e3c29f8fcee7dd - [Complete plan package](https://diyplans.org/downloads/packages/766a6fd596ec67c6e6ae661fca4a8a02ddbee3237e8741b11306380db402c306/download-package/natural-rail-jump-r6-package.zip): ZIP, 119824 bytes, file revision 6. Matching cleaned FreeCAD and STEP models with the CSV schedules. Instructions and drawings are on the website. SHA-256: 642144e1a22e14fa8e45b5f53b964aa8779f863d8fd22ba45df929f4f9aa3714 ## Using the CAD files - Open the native model to inspect or edit individual solids. The dimension sheet is informational and does not regenerate geometry. - Hide the six N02 pole-body objects to see both complete standards, or hide one standard to inspect the other. Every base has four arms and four illustrated bolt sets. - The STEP export matches the native solids. Rail joints and release hardware remain absent; base hardware is depicted as generic unthreaded envelopes. - Save a separate study copy and update drawings and schedules with any geometry changes.