#21
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Still looking (for the rocket).
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Enjoy life, it has an expiration date. |
#22
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Me too! I saw NO rocket in that picture.
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I plan ahead that way I don't have to do anything right now. Oh by the way, I'm not here just for the "olde" rocket discussions. |
#23
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I don't know... she looks kinda pissed. Nice build thread though. |
#24
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Glassing tips
Quote:
Thanks! More updates coming soon... I think she looks pissed because there hasn't been a decent replacement for the Estes Centurion in production for years (one that was a decent glider at any rate). I know I am... Back to building: Glassing technique. Photos below show the method used to do all of the fiber glass reinforcements on this model. Handling and cutting light weight glass cloth and carbon tow fibers can be difficult. I like easy. So... I use "helper" materials. Not shown is a can of 3M 75 spray adhesive. Used sparingly, it makes handling of the cloth easy (oh... and I mean very sparingly). Peel ply is your friend guys. It makes it possible to get very dry layups without vacuum bagging. It also leaves a surface that requires very little filling or sanding that can be bonded to. Regards, FlyBack Last edited by FlyBack : 04-12-2011 at 08:32 PM. Reason: syntax |
#25
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Control System
Progress Update: Rigging the control system
The most difficult part of the build is now behind me. The V-tail is finished and attached to the booms. The fixed portion is covered in Esake Silk. The rudder-vators are covered in Japanese Tissue. Water based polyurethane was use as the binder. My technique for bending the PEEK tubing has been refined, and the servo tray is ready to install. Bending the control runs (PEEK tubing), without collapsing the wall, had me stumped for a while. I finally found some stainless steel, braided leader wire that was just under the ID of the tubing. Threading that through the tube to be bent, and then heat forming it around my mandrel worked like a charm. Weights now include hardware for aileron servos. I had hoped to do this with rudder and elevator alone but have decided to go for full control on all three axis. Latest weigh in: Airframe - 170.9 grams Servos - 31.2 grams Rx - 7.4 grams Battery - 15.6 Regards DJ Miller |
#26
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Rigging continued
More photos...
Uploaded some photos of the servo tray before it gets installed. It took some time to get the servo height just right to line up with the cable runs... but worth the effort. Cutting slots in the wing for the tail booms creates an enormous stress concentration. The photos of the wing show the area where I have added a fiberglass reinforcement (shown with and without peel ply). The bottom side will be glassed also. Latest weigh in results: Servo Tray 4.0 gm PEEK tubing 1.5 gm Glass on wing 15.0 gm Airframe 191.8 gm Total 8.3 oz 235.6 gm Regards, FlyBack Last edited by FlyBack : 04-13-2011 at 09:09 PM. |
#27
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Control Horns
Todays topic: Control horns and negative Ackerman...
Not a lot to say here, most of the really good "Ackerman" links have already been posted. If I have gotten the angles on the control horns wrong, they will bind. Since they are now installed, I will know as soon as I pull the control wires and start testing (sometime tonight or tomorrow... stay tuned).. The photo set below shows some of the steps involved in making control horns from scratch. I tend to build right off the drawing board. It saves time. A light coat of white primer on the graphite sheet makes it easy to see pencil markings. Sticky paper templates invariably peel or shift when working on parts this small. Eventually I will go back and do CAD drawings of the finished parts (when I am sure the parts I am drawing actually work). Safety Warning: Use protective gear when working with carbon fiber. (See attached photo). Regards, DJ Miller Last edited by FlyBack : 04-19-2011 at 12:38 AM. Reason: added Ackerman link |
#28
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Pull/Pull control system
It works...
On the ground at least. The pull/pull control system is installed and tested. No binding, zero slop. Photos attached: Regards, FlyBack Last edited by FlyBack : 04-19-2011 at 12:32 AM. Reason: added text to photos |
#29
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Pull/Pull control system details
More details...
The servo horn screws hold the tension on the wires. Attachment to the control surface horn is a simple overhand knot tied in the wire. Latest weigh in includes the servos, receiver and battery pack: Total 241.82 gm (8.53 oz) Parts remaining: Aileron push rods, Fuselage hatch, hatch mounting points (for nylon screws - four places). FlyBack |
#30
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This is just an amazing build thread and project. Super!
__________________
Enjoy life, it has an expiration date. |
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