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Post by SKYHOBBIES on Mar 31, 2009 22:25:27 GMT 8
Hi all, I am embarking on the new GAUI CH47 for the purpose of reviewing this kit entirely. As I write this, there's also another thread which is also on going at the same time by "hoverup" BOYD at rcgroups.com here : www.rcgroups.com/forums/showthread.php?t=1024236 |
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Post by SKYHOBBIES on Mar 31, 2009 22:33:08 GMT 8
I have decided to use Hitec HS-45HB (1.0kg torque) for this project. Another candidate servo for this fit would be the DOUBLE BALL_BEARING HYPERION DS-09SCD which shares the similar dimensions but with greater torque (1.8kg). The frame is of the same quality CNC cut for the GAUI EP200 with CNC Rotor Head for 120 swash. Every servo was snuggly fitted onto the frame without the need for any filings, even the servo bracket holes are exact fit!  |
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Post by SKYHOBBIES on Mar 31, 2009 22:35:20 GMT 8
easy installation of the servos... even the hard to reached corners have recessed gap for screw driver access easily...  |
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Post by SKYHOBBIES on Mar 31, 2009 22:38:12 GMT 8
Here's a peek at the CO-BRAND Motor between GAUI and SCORPION. It is called GUEC GM-401 with a rating of 1750KV The Motor is already pre-fitted on the Carbon Fiber motor mount with the drive belt pre-installed as it comes, no need for further work from here... just need to run through the screws to make sure all are tight and snugged!  |
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Post by SKYHOBBIES on Mar 31, 2009 22:44:18 GMT 8
Here is how the tandem mechanism looks like after it is removed from the fuselage. Note : The tandem mechanism is already pre-fitted inside the fuselage as it comes, you have to remove the 4 hex screws so that the whole mechanism will drop right through and out from the bottom.   |
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Post by SKYHOBBIES on Mar 31, 2009 22:48:16 GMT 8
closer look of the CH47 Fiberglass Fuselage and it's panel lines...   |
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Post by SKYHOBBIES on Apr 3, 2009 0:58:06 GMT 8
now into the 2nd day of the assembly... Here is a re-cap of the linkages length recommended on the manual. Note it is very important for you to follow exactly what is recommended as this length will allow you ample mechanical adjusting on the pitch and tracking if required.  |
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Post by SKYHOBBIES on Apr 3, 2009 1:18:29 GMT 8
Made a test stand before installing it into the fuselage for the purpose of hop test. Nothing fancy, just disposal foam blocks and wooden spar undeneath for GU368 mounting... Note the GU369 3 Axis Gyro is not supposed to be mounted at the boom (as shown below). We have tried and the vibrations from the frame amplified many times causing uncontrollable oscilations on the inertia - even adjusting on the gain of GU368 does not help as the contact of vibration comes direct via the boom...  |
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Post by SKYHOBBIES on Apr 3, 2009 1:21:35 GMT 8
Here's the completed stand... thanks for Linhai  The GU368 gyro was later shifted underneath on a sqaure wooden spar across the 2 foam boards... the vibrations were significantly reduced and easier adjustments can be made  |
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Post by SKYHOBBIES on Apr 3, 2009 1:25:20 GMT 8
After the hop test, the whole setup is now ready for installation... Here is a quick view of my internal setup... temporarily only as I would expect more adjustments and tweeking. Everything same as what the assembly manual suggest. Apparently the 6 pieces of servo extensions were not used as those lengths of the HS-45HB served enough length to stretch from both sides... now this help saves more weight!  |
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