Fun, Learning, Friendship and Mutual Respect
START  HERE


Unregistered
Go Back   HeliFreak > R/C Helicopter Support > Multi Rotor Helicopters - Tandem


Multi Rotor Helicopters - Tandem Multi Rotor Helicopters - Tandem


Reply
 
Thread Tools Display Modes
Old 05-06-2007, 05:25 PM   #1
Gra55h0pper
Registered Users
 
Posts: 143
 

Join Date: Aug 2006
Location: Sunnyvale, CA
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:
Gra55h0pper is offline        Reply With Quote
Old 05-06-2007, 05:59 PM   #2
Gra55h0pper
Registered Users
 
Posts: 143
Thread Starter Thread Starter
 

Join Date: Aug 2006
Location: Sunnyvale, CA
Default

Well, OK then... The before picture...
Attached Images
File Type: jpg before_assembly_117.jpg (871.3 KB, 1343 views)
Gra55h0pper is offline        Reply With Quote
Old 05-06-2007, 07:08 PM   #3
robwil
Registered Users
 
Posts: 128
 

Join Date: Jan 2007
Location: Melbourne Australia
Default

It will be awsome to see this getting built as i have seen these featured in a mag
__________________
Trex 700E FBL, V-Bar Castle Creations 120HV
Logo 500,FBL V-Bar Scorpion, Castle Creations Ice 100
Trex 550E FBL 3G Castle Creations Ice 100
Hirobo SDX, slowbar, YS50, GY520 and ace 1015's
Futaba 12FGH 2.4 FASST
robwil is offline        Reply With Quote
Old 05-06-2007, 09:47 PM   #4
good2win22
Registered Users
 
Posts: 215
 
My HF Map location
Join Date: May 2006
Location: Gatesville, Texas
Default

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?
__________________
Raptor 50 Titan
Trex 700
good2win22 is offline        Reply With Quote
Old 05-06-2007, 09:50 PM   #5
good2win22
Registered Users
 
Posts: 215
 
My HF Map location
Join Date: May 2006
Location: Gatesville, Texas
Default

I forgot to ask about the fuselage, what's the word on it?
__________________
Raptor 50 Titan
Trex 700
good2win22 is offline        Reply With Quote
Old 05-06-2007, 11:56 PM   #6
Gra55h0pper
Registered Users
 
Posts: 143
Thread Starter Thread Starter
 

Join Date: Aug 2006
Location: Sunnyvale, CA
Default

No fuse yet. I think Joe is still working on it.
Gra55h0pper is offline        Reply With Quote
Old 05-06-2007, 11:58 PM   #7
LITHIUMSTATIC
Registered Users
 
Posts: 7,686
 
My HF Map location
Join Date: May 2006
Location: McKinney TX
Default

What is this heli?
__________________
Just a guy and his heli....
LITHIUMSTATIC is offline        Reply With Quote
Old 05-07-2007, 12:07 AM   #8
Gra55h0pper
Registered Users
 
Posts: 143
Thread Starter Thread Starter
 

Join Date: Aug 2006
Location: Sunnyvale, CA
Default

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, 912 views)
File Type: jpg test_fit_right_front.jpg (2.04 MB, 505 views)
File Type: jpg test_fit_left_rear.jpg (2.03 MB, 442 views)
File Type: jpg test_fit_left_front.jpg (2.00 MB, 411 views)
File Type: jpg test_fit.jpg (2.13 MB, 667 views)
Gra55h0pper is offline        Reply With Quote
Old 05-07-2007, 12:12 AM   #9
Gra55h0pper
Registered Users
 
Posts: 143
Thread Starter Thread Starter
 

Join Date: Aug 2006
Location: Sunnyvale, CA
Default

Some more test-fitting pictures...
Attached Images
File Type: jpg test_fit_rear_landing_gear.jpg (2.11 MB, 477 views)
File Type: jpg test_fit_front_landing_gear.jpg (2.11 MB, 372 views)
File Type: jpg test_fit_rear_drive_shaft_bearing_block.jpg (2.05 MB, 428 views)
File Type: jpg test_fit_front_drive_shaft_bearing_block.jpg (2.04 MB, 476 views)
Gra55h0pper is offline        Reply With Quote
Old 05-07-2007, 02:54 AM   #10
robwil
Registered Users
 
Posts: 128
 

Join Date: Jan 2007
Location: Melbourne Australia
Default

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
__________________
Trex 700E FBL, V-Bar Castle Creations 120HV
Logo 500,FBL V-Bar Scorpion, Castle Creations Ice 100
Trex 550E FBL 3G Castle Creations Ice 100
Hirobo SDX, slowbar, YS50, GY520 and ace 1015's
Futaba 12FGH 2.4 FASST
robwil is offline        Reply With Quote
Old 05-07-2007, 03:51 AM   #11
kgfly
HF Support
 
Posts: 4,969
 
My HF Map location
Join Date: Jun 2006
Location: Melbourne, Australia
Default

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.
__________________
Kenneth
* MSH Protos Stock motor/15t/Align75/Align DS510/GL730+DS520/7s A123 2300
* TRex450CF/430L/12t/CC45/HS65mg/L2100T/KP 3s 2200 25C or 4S LiFe
Previous rides: HX242, W5-4, TRex450(HDE), TRex450(SE), QJ-EP8v2, BCX2 ,Logo10, Hurricane550
SIM: Phoenix (previously also Reflex/XTR, ClearView, RF, FMS)
kgfly is offline        Reply With Quote
Old 05-07-2007, 08:53 AM   #12
Funky
Registered Users
 
Posts: 4,596
 
My HF Map location
Join Date: May 2006
Location: Westerville, OH - USA
Default

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
__________________
More helis than brains
Funky is offline        Reply With Quote
Old 05-07-2007, 11:51 PM   #13
rotorblade
Registered Users
 

Join Date: Jul 2006
Location: GA
Default

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.
__________________
Rotatus Aircraftus Fragmentus!! Its latin. Please keep the skids down on touchdown!!!!
rotorblade is offline        Reply With Quote
Old 05-08-2007, 12:36 AM   #14
Gra55h0pper
Registered Users
 
Posts: 143
Thread Starter Thread Starter
 

Join Date: Aug 2006
Location: Sunnyvale, CA
Default

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.
Gra55h0pper is offline        Reply With Quote
Old 05-08-2007, 12:46 AM   #15
Gra55h0pper
Registered Users
 
Posts: 143
Thread Starter Thread Starter
 

Join Date: Aug 2006
Location: Sunnyvale, CA
Default

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, 320 views)
File Type: jpg drive_shaft_right_front.jpg (2.07 MB, 229 views)
File Type: jpg drive_shaft_left_front.jpg (2.07 MB, 298 views)
Gra55h0pper is offline        Reply With Quote
Old 05-08-2007, 12:48 AM   #16
Gra55h0pper
Registered Users
 
Posts: 143
Thread Starter Thread Starter
 

Join Date: Aug 2006
Location: Sunnyvale, CA
Default

Couple more pics showing the center 2 drive shaft bearing blocks...
Attached Images
File Type: jpg drive_shaft_bearing_block_rear.jpg (1.91 MB, 278 views)
File Type: jpg drive_shaft_bearing_block_front.jpg (1.93 MB, 234 views)
Gra55h0pper is offline        Reply With Quote
Old 05-08-2007, 06:15 AM   #17
good2win22
Registered Users
 
Posts: 215
 
My HF Map location
Join Date: May 2006
Location: Gatesville, Texas
Default

Looking good!!! Keep up the good work.
__________________
Raptor 50 Titan
Trex 700
good2win22 is offline        Reply With Quote
Old 05-08-2007, 08:43 AM   #18
Funky
Registered Users
 
Posts: 4,596
 
My HF Map location
Join Date: May 2006
Location: Westerville, OH - USA
Default

Looks sweet!! Can't wait to see this one flying.
__________________
More helis than brains
Funky is offline        Reply With Quote
Old 05-09-2007, 01:45 AM   #19
Gra55h0pper
Registered Users
 
Posts: 143
Thread Starter Thread Starter
 

Join Date: Aug 2006
Location: Sunnyvale, CA
Default

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, 408 views)
File Type: jpg upgrade_to_trex_se_v2_gear__1_.jpg (1.06 MB, 325 views)
Gra55h0pper is offline        Reply With Quote
Old 05-09-2007, 01:55 AM   #20
Gra55h0pper
Registered Users
 
Posts: 143
Thread Starter Thread Starter
 

Join Date: Aug 2006
Location: Sunnyvale, CA
Default

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 (???)
Gra55h0pper is offline        Reply With Quote
Reply




Unregistered
Go Back   HeliFreak > R/C Helicopter Support > Multi Rotor Helicopters - Tandem


Multi Rotor Helicopters - Tandem Multi Rotor Helicopters - Tandem

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


Copyright © 2004-2015 by RCGroups.com, LLC except where otherwise indicated. The HeliFreak.com logo is a trademark of RCGroups.com, LLC.