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12-29-2012, 08:08 PM | #1 (permalink) |
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Join Date: Feb 2011
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Home built Naza-H GPS protector
Home built Naza-H GPS protector
I built this protector after having a boom strike that resulted in my GPS module being cut off, and the module body getting damaged as well. I hope that other RC heli pilots find this useful. I. Assumptions, etc... 1. The standard disclaimer applies. In short, you use this information at your own risk. 2. This modification will alter the CG of the helicopter. Be sure to compensate for any changes! 3. This modification requires mounting the GPS module in an alternative location. Thus, you must re-run the setup to compensate for the physical offset. 4. This project is for a Trex 500e. Thus, no exact measurements are provided, except if specified. These build plans are for general usage, and should be easily modified for larger or smaller helicopters. II. Construction... Materials and tools needed: 1-1/2" PVC end cap Aluminum angle, preferably 1-1/2 x 1-1/2 or larger Hacksaw, ruler, and marker. Measure twice, cut once, as they say... Two M3 x 10mm countersink machine screws, two M3 washers, and two M3 nuts. Wire ties Drill bits Loctite 1. Start by obtaining a 1-1/2" PVC end cap. Cut the end cap in half, and properly dispose of the "ring" of PVC material left over from the cut. You need at least 9/16" to 5/8" depth left inside the PVC end cap. 2. Next, cut a one inch wide strip from a 1-1/2 x 1-1/2 aluminum channel. 3. Note: Clock refences are made with the open end of the cap facing you. That being said, take the PVC end cap and drill two 3/8" holes 90* apart. One hole at 12 O'clock, the other at 3 O'clock. Drill a third 1/8" hole at 9 O'clock for allen wrench access. You want to drill the holes so that the "bottom" edge of the drilled hole meets with the inside base of the PVC end cap. 4. On the 12 O'clock hole, make two cuts from the edge of the cap, to the edge of the hole. This will look like a "U" shaped hole when completed, and is used to channel the GPS cable. 5. Drill two smaller holes at 1 O'clock to accomodate a wire tie. This will act as a strain relief for the gps cable. 6. Next, you want to measure the mounting holes in the bracket. For best results, you will need to take off the tail fin so that you can get accurate hole placement. It is best to center the holes on the bracket, and align the holes through the middle of the bracket as well. Drill one hole first, bolt the bracket onto the fin, mark the second hole. disassemble the bracket from the tail fin, and carefully drill the remaining hole. These holes need to be just large enough for the bolts that hold the tail fin onto the boom. 7. Now, you will need to drill two holes through both the PVC end cap, and the aluminum bracket. For best results, drill the center hole first. Then counter sink the hole on the inside of the PVC end cap. Then bolt the PVC end cap to the bracket, keeping in mind the orientation of the PVC end cap. The end result is that the bracket is on the 3 O'clock side of the PVC end cap, with the angled aluminum facing up. Drill the second hole inside the PVC end cap, countersink the hole, and then place the second bolt into the PVC end cap. Place washers and nuts on the ends of the bolt, and tighten. Use of Loctite to secure the bolts is highly recommended. 8. Now mount the assembly to the helicopter. You can insert an Allen wrench into the hole made at the 9 O'clock position to accommodate mounting the bracket to the helicopter. 9. Take the extender cable that DJI supplies with the GPS unit, and plug that into the IMU. Route the cable alongside of the boom on the "non- boom strike" side of the boom. That is, as the nose of the helicopter is facing away from you and the tail is closest, route the cable on the left side of the helicopter. Use multiple wire ties to fasten the extender cable down to the boom. Route the end of the cable that the GPS plugs into on the bottom left side of the tail fin. 10. Thread a small wire tie into the PVC end cap at the 1 O'clock position. Next, mount the GPS into the PVC end cap using then two-sided 3M tape that DJI supplies. For best results, use a straight edge to assist with the GPS alignment. Make sure the GPS is aligned properly and parallel to the tail boom. Route the GPS cable in a clockwise fashion around the outer edge of the PVC end cap, and then secure it with the tie wrap at the 1 O'clock position. Continue to route the cable down to the tail fin, and then securely fasten it to the extender cable with wire ties. 11. The project is now complete. You will need to re-run the setup to specify the GPS offset. Pay particular attention to the helicopter's CG. You will need to rebalance the helicopter to accommodate the weight of the GPS protector. YouTube video showing test flight and general construction: [ame]http://www.youtube.com/watch?v=0WE6JnF9SXs[/ame] See also attached photo of completed project. Last edited by NexxuSix; 12-30-2012 at 08:20 AM.. |
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12-29-2012, 09:47 PM | #2 (permalink) |
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looks great, think I may try this too. Thanks for taking the time to make the documentation.
Cheers! |
12-30-2012, 12:01 AM | #3 (permalink) |
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I like the concept. My only concern is vibration and possible interference from the close proximity of the tail rotor. But looking at your video I can see no evidence of it so it must be ok. Nice work.
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