Pre-production Twinn-Rexx build pictures - HeliFreak
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Old 05-06-2007, 06:25 PM   #1 (permalink)
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Default Pre-production Twinn-Rexx build pictures

Joe Orlando (www.tech-mp.com) was kind enough to sell me a pre-production kit version of the Twinn-Rexx!

Guess nobody is really interested in my build experiences and pictures? :wink:
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Old 05-06-2007, 06:59 PM   #2 (permalink)
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Well, OK then... The before picture...
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File Type: jpg before_assembly_117.jpg (871.3 KB, 1549 views)
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Old 05-06-2007, 08:08 PM   #3 (permalink)
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It will be awsome to see this getting built as i have seen these featured in a mag
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Old 05-06-2007, 10:47 PM   #4 (permalink)
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I am very interested in seeing and hearing how this bird comes together. Keep the pics and experiences coming.

robwil, which mag did you see the twin rex featured in?
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Old 05-06-2007, 10:50 PM   #5 (permalink)
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I forgot to ask about the fuselage, what's the word on it?
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Old 05-07-2007, 12:56 AM   #6 (permalink)
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No fuse yet. I think Joe is still working on it.
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Old 05-07-2007, 12:58 AM   #7 (permalink)
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What is this heli?
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Old 05-07-2007, 01:07 AM   #8 (permalink)
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The bird is coming together very well! I decided to test fit the complete assembly first as my pre-production kit doesn't have a full manual yet (it did come with a set of build notes though). Also, I wanted to check for proper fit before applying any loctite. Using the pictures on the tech-mp web-site, it's easy to determine what goes where.

Only thing to take care about is that two spacers and 4 nylon washers need to be installed between the mainframe aluminum tube and the left frame plates (front, rear, front drive shaft bearing block and rear drive shaft bearing block).

Everything fits great!
Attached Images
File Type: jpg test_fit_right_rear.jpg (1.99 MB, 1090 views)
File Type: jpg test_fit_right_front.jpg (2.04 MB, 628 views)
File Type: jpg test_fit_left_rear.jpg (2.03 MB, 553 views)
File Type: jpg test_fit_left_front.jpg (2.00 MB, 530 views)
File Type: jpg test_fit.jpg (2.13 MB, 826 views)
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Old 05-07-2007, 01:12 AM   #9 (permalink)
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Some more test-fitting pictures...
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File Type: jpg test_fit_rear_landing_gear.jpg (2.11 MB, 601 views)
File Type: jpg test_fit_front_landing_gear.jpg (2.11 MB, 479 views)
File Type: jpg test_fit_rear_drive_shaft_bearing_block.jpg (2.05 MB, 540 views)
File Type: jpg test_fit_front_drive_shaft_bearing_block.jpg (2.04 MB, 597 views)
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Old 05-07-2007, 03:54 AM   #10 (permalink)
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i saw it in model helicopter world where it began life as a twin dragonfly but was changed to trex parts because of problems getting hornet heads. the issue was oct 2006
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Old 05-07-2007, 04:51 AM   #11 (permalink)
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This will be fun to watch, thanks for sharing.

Quote:
Originally Posted by LITHIUMSTATIC
What is this heli?
Take a look at the tech-mp website, there are photos and videos of the TwinRexx in development.
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Old 05-07-2007, 09:53 AM   #12 (permalink)
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Keep the pics coming, the more the better. Any word on when the production kit will be available? What electronics do you need to make it work? Sorry about all of the questions, but I would love to have one
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Old 05-08-2007, 12:51 AM   #13 (permalink)
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What is this heli????

Its called a CHINOOK baby. AKA a SH**HOOK.


Oh heck yeah Kick a**.

I will definitely getting one of these things.
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Old 05-08-2007, 01:36 AM   #14 (permalink)
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Funky,

Not sure when the production kit will be available. That's something for Tech-mp to decide.

For electronics, you need a mixer with 2 CCPM outputs with DCP (Differential Collective Pitch) capability. This means that when applying elevator, a different pitch will be applied to the front and rear rotors causing the heli to tilt forward or backward as desired. Tech-mp has such a mixer, called the TH-2. See their web-site for more information.

Grasshopper.
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Old 05-08-2007, 01:46 AM   #15 (permalink)
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Finished installing the drive shaft as well as the two main shafts. Not tightening any frame parts till now definitely made sense as it allowed me to make sure the frame and bearing block "set" to the shafts rather than the other way around which could cause the shafts to not rotate smoothly as well as excessive wear on the bearings.

I simply loosly tightened everything first. Then checked for smooth rotation and the proper (very minor) play in the gears. Then tightened things repeatedly a small amount at a time.

Things run pretty smooth! Everything fit perfectly! Assembly was a breeze so far! I'm a very happy man! :mrgreen:
Attached Images
File Type: jpg drive_shaft_right_rear.jpg (2.06 MB, 440 views)
File Type: jpg drive_shaft_right_front.jpg (2.07 MB, 337 views)
File Type: jpg drive_shaft_left_front.jpg (2.07 MB, 401 views)
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Old 05-08-2007, 01:48 AM   #16 (permalink)
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Couple more pics showing the center 2 drive shaft bearing blocks...
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File Type: jpg drive_shaft_bearing_block_rear.jpg (1.91 MB, 393 views)
File Type: jpg drive_shaft_bearing_block_front.jpg (1.93 MB, 342 views)
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Old 05-08-2007, 07:15 AM   #17 (permalink)
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Looking good!!! Keep up the good work.
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Old 05-08-2007, 09:43 AM   #18 (permalink)
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Looks sweet!! Can't wait to see this one flying.
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Old 05-09-2007, 02:45 AM   #19 (permalink)
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Couldn't resist... Decided to make my first upgrade... :mrgreen:

I noticed that the main drive gear on the new Trex SE v2 is more true, solid and generally stronger. Though possibly not really necessary, I decided to upgrade to it as I had one of these gears anyway. As the gear in the Twinn-Rexx needs to drive the load of two main rotors instead of one (no tail rotor though) having a somewhat stronger gear provides a little extra "piece of mind".

Only thing to note here is that the front-rotor on the Twinn-Rexx rotates counter-clockwise (CCW) where the rear-rotor rotates CW. As the front-rotor is driven by the gear and runs opposite to the rotor on a regular Trex, the one-way bearing needs to be extracted and installed "upside down". Guess most of us (unfortunately) have experience how to take the one-way bearing out of its sleeve... :mrgreen: If you don't, Align has a special little tool helping you do this, or there are other posts describing ways using e.g. a drill-press.

The pictures show the change. Note the difference with the drive gear picture shown before...

(Note: it will likely be a while before I can post on the next build step as I have some very busy days at work ahead of me. Besides, I really want to enjoy this build, so pls understand that I'm not in a hurry... )
Attached Images
File Type: jpg upgrade_to_trex_se_v2_gear__2_.jpg (922.8 KB, 549 views)
File Type: jpg upgrade_to_trex_se_v2_gear__1_.jpg (1.06 MB, 453 views)
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Old 05-09-2007, 02:55 AM   #20 (permalink)
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Does anybody know whether any of the real Chinooks come with a retractable landing gear? It seems real easy to me to convert the LG on the Twinn-Rexx to retracts (a potential future mod), however, I seem to recall Chinooks having a fixed gear (???)
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