The T-Rex (and others) parts thread

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another_finn
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Age: 35
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Post Posted: Fri Oct 26, 2007 9:18 pm
Post subject: The T-Rex (and others) parts thread
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You all know what this is about - We keep hearing how some T-Rex parts are supposed to be compatible with the Belt CP, but we rarely hear which parts. I think it's time for some answers. I didn't find a thread that conveniently compiles the available information in one place, so I decided to start one.

As long as the Edit function remains available, I will add to this post any confirmed tales and convincing rumors of non-Belt parts, upgrades and bling that myself and others have managed to install on their helicopters. Where possible, I will give credit to original poster and provide a link to the relevant thread. The initial list is what I have discovered on various forums and tested on my own Belt. If you have posted some of these items before, let me know and I'll link to the thread. I'll also try to find existing threads, so please don't feel ripped off if your contribution isn't credited to you yet. If anybody has new items, ideas, good leads or questions, post away.

The (not that short anymore) list:
  • T-Rex head
  • HDX/3DX450 B style head and swashplate combo.
  • T-Rex 450 tail mechanics
  • Blade 400 tail pitch slider (thanks to CodeB4U, derelicte)
  • Blade 400 tail boom supports (thanks to CodeB4U)
  • T-Rex feathering shaft (for standard head #HR1003, #HS1003) (thanks to chewymix, testpilot58d) *
  • T-Rex flybar and paddles (thanks to chewymix) *
  • T-Rex linkage set (thanks to chewymix)
  • T-Rex XL main shaft (#HR1001) *?
  • King II main shaft (thanks to merigold2005)
  • MX400 tail rotor output shaft (#HMXE9710) (thanks to testpilot58d)
  • T-Rex main gear (thanks to dex)
  • Heli-Max MX400 main gear (thanks to weblst)
  • Ark X400 main gear (thanks to Technical Tim)
  • Eflite Blade 400 main gear (thanks to weblst)
  • HS1026 - One Way Bearing HF0612 (thanks to peachey007)
  • Align 315 Pro blades
  • Align 325 Pro blades (thanks to chewymix)
  • HDX 315 Fiber FRP blades
  • T-Rex tail blades (thanks to chewymix)
  • T-Rex flybar paddles (thanks to merigold2005) *?
  • T-Rex new damper system (#FS-BLK-V1)
  • MX400 dampers (#HMXE7358) (thanks to testpilot58d)
  • T-Rex 450 Canopy
  • Canopy mounting bolt (#HS1212, #H50049T) (thanks to testpilot58d, heitkamp)
  • T-Rex XL tail boom & belt (thanks to ronniebiggs)
  • T-Rex horizontal and vertical stabilizers
  • HDX450 aluminum skids (#HDX450-LG02)

*) Plastic edition only

T-Rex 450 tail mechanics
This little piece of CNC art is the Microheli Precision Tail Pro SE V3. When you absolutely, positively have to remove any slop in the tail, accept no substitute Smile
The only slight problem with this particular version is the screw hole for the ball link - it seems to be in some alien thread as yet undiscovered by human science. I think the spec has irrational numbers in it. It's still just aluminum, though, so it rethreads easily. Alternatively, you could just fit a Rex size ball link end on your tail pushrod. Align stuff should be no problem - they seem to hang their balls on the same thread as Esky, so you could recycle the ball and screw from your stock tail.


T-Rex/HDX450 feathering shaft
Requires shimming at blade holder roots, and bolts to replace the nuts on the Belt shafts. Creates more space inside the blade grips for Align blades, easier to tighten evenly, no more hunting for extra slim and deep box spanners. Better material and less likely to bend.

T-Rex XL 116 mm stainless steel main shaft
Put it in upside down so the waist doesn't ride in the bearing. Grind a small flat for the collar grub screw. Turn all servo links down to restore your pitch settings and say goodbye to the spool-up boogie. Reduces vibrations and should handle stress better than the original part.



King II main shaft
Same as T-Rex shaft: insert upside down, turn down swashplate links to restore pitch.

Align 315 Pro blades
Reshape the blade root to create clearance for the feathering shaft. Use two 1 mm shimms to fill up the blade holder. Lighter weight, better performance and more durable than Esky woodies. Once you try these, you'll never go back.



HDX Fiber FRP 315 mm blades
Use two 1 mm shimms to fill up the blade holder. No reshaping necessary. Extremely durable blades that perform well on the Belt.

T-Rex flybar paddles
Drop-in fit. They make control inputs less spongy and look great.

T-Rex new damper system
Split along the middle and these are a drop-in replacement of the rotor head o-rings. Much stiffer, they reduce slop in the feathering shaft and should be just the ticket for fixing those incurable tracking problems. The T-Rex o-rings work too, but won't be anywhere near as stiff as these.

T-Rex 450 canopy
Perfect fit. Some versions may need a little cut on the side so they don't contact the front servo rod. Provides more space for mounting the battery forward, which is just what the Belt needs. Looks good too.



T-Rex horizontal and vertical stabilizers
That's fins to us simple folk. Drop-in fit. Horizontal comes with its own mount - the original Esky boom mount has the correct screw hole spacing, but the new fin is shaped to grip the boom. Original mount still in the picture because I was too lazy to remove the boom and didn't have the heart to cut it off.



HDX450 aluminum skids
Legs need new holes outside the existing ones, and I couldn't find a suitable drill bit. The skid part and rubber holders are a drop-in fit on the Esky plastic legs.


So, come on, you compulsive modders out there - chime in with your own modifications and upgrades. I'm sure there are other parts that could be made to work on the Belt. Oh, and for those of you about to ask why not get a T-Rex or HDX450 in the first place: It wouldn't be a hobby if it had to make sense Smile
_________________
Mika

HDX500 SE V2
HDX450 SE V3
T-Rex hybrid MD500, used to be my Belt CP
King II/CopterX 450/300 hybrid
HBFP brushless separates
Lama V3 to V4 conversion
Walkera 4#3B


Last edited by another_finn on Sat Mar 29, 2008 11:11 am; edited 23 times in total
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