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T-REX 250 › Maidened 250! First Crash! (Updated)
12-14-2008 04:57 AM  9 years agoPost 1
docjoe

rrElite Veteran

Stockton, CA United States

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I briefly maidened my 250 tonight. It was uneventful but I forgot how these micro Helis fly. I only hovered it in my living room and back yard. I'm looking forward to flying t more aggressively tomorrow.

The build went well except I stripped out the bolts on the tail boom block and I believe the micro Allen wrench I got in the kitwas either a little too small, causing stripping, or the metal itself was too soft and it wore out, causing the other bolts to near stripping.

My solution for the boom block was to use long 1.5mm bolts and nuts going through the whole boom block. It works well. I had to take out the aluminum rods inside the boom block.

Joe
We haven't seen Colonel Angus around these parts for years!

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12-14-2008 12:20 PM  8 years agoPost 2
Learn to Fly

rrKey Veteran

Yalesville Connecticut

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Get a Wiha .9 driver.

The screws are fine, it's the tool that came with the kit. It is soft!!

I whacked mine the 3rd flight/ Just need a spindle though.


Jeff
Believe nothing you hear, and half of what you see...

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12-14-2008 01:20 PM  8 years agoPost 3
Gyronut

rrProfessor

Martinsville In.

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When I maidened mine I couldn't believe how smooth it was for such a small heli.

Rick

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12-14-2008 06:26 PM  8 years agoPost 4
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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i used a Wiha driver for the whole build and still ended up stripping 4-5 screws. seems the 12-yr old girls in taiwan are bringing the kung fu grip.

still, it was worth the teardown, as there were 3 screws with no loctite.

great flying heli. but, i'm going nuts waiting for the carbons. this will be such a hot little heli on some real blades.

if it ain't broke, break it.

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12-16-2008 01:05 AM  8 years agoPost 5
docjoe

rrElite Veteran

Stockton, CA United States

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So I had my second flight on the 250 today and the tail belt was a little loose. I noticed that the tail wasn't holding very well. So guess what I did? I flew it anyway and so I deserved the crash. I started to lose tail control and then it crashed.

Here's the damage:
1. I broke one of the balls of the mixer arm (so had to buy one set of those).
2. Main and Tail Blades.
3. Possibly main and feathering shafts (very difficult to find in stock)
4. Slight boom strike on the tail boom
5. Ball link to main grips
6. Battery tray (plastic part ripped out but CF portion intact)
7. Landing struts (these are so fragile. Where are my gorilla gear for this?)

So the heli is grounded for a few days

It's good that the weather is forecasted to suck in the next few days.

Joe
We haven't seen Colonel Angus around these parts for years!

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12-16-2008 01:29 AM  8 years agoPost 6
Jesse Kavros

rrApprentice

San Jose, California

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I beleive FXAeromodels has the Main Shaft and Feathering shat in stock.

http://www.fxaeromodels.com/index.p...=49_360_445_443

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12-16-2008 01:46 AM  8 years agoPost 7
docjoe

rrElite Veteran

Stockton, CA United States

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They are out of stock now. I looked all over and it seemed Zooms had them. I ordered them and there was no notification that they were not in stock. Hopefully they are not back ordered.

Joe
We haven't seen Colonel Angus around these parts for years!

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12-16-2008 02:25 AM  8 years agoPost 8
Heli-on

rrVeteran

Southern Cali, CA - USA

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The Wiha tool is junk. The tolerances are almost as bad as Align's. It will provide better results than the Align, but the MIP is the way to go. http://www.miponline.com

flyhelirus.com has everything you need in stock. If you suspect the main shaft is bent, you should just plan on replacing it. This heli doesn't like any vibrations at all because of the higher headspeed. With that much damage, you should plan on doing your tail shaft, too. They're much more difficult to see any damage on and you can't roll them down a piece of glass.

Folks have been using Gaui hurricane struts. Even the 450 GG works on this heli. If you have a set, you can put them on there until you get the kinks worked out. Flyhelirus also has the 'bulk packs' of gear in stock.

Some folks have been putting an additional tail stab mount collar against the boom block to help maintain the adjustment. I think grinding down some material from both halves of the block (and aluminum spacers) yields better results. The belt needs about 3 adjustments before it settles, so be aware of that. My belt adjustment holds great with no mods, but I'm using the MIP tool, which I think makes a BIG difference.

If you haven't<textarea id=rrta name=message rows=22 cols=70 wrap=virtual>The Wiha tool is junk. The tolerances are almost as bad as Align's. It will provide better results than the Align, but the MIP is the way to go. http://www.miponline.com

flyhelirus.com has everything you need in stock. If you suspect the main shaft is bent, you should just plan on replacing it. This heli doesn't like any vibrations at all because of the higher headspeed. With that much damage, you should plac on doing your tail shaft, too. They're much more difficult to see any damage on and you can't roll them down a piece of glass.

Folks have been using Gaui hurricane struts. Even the 450 GG works on this heli. If you have a set, you can put them on there until you get the kinks worked out. Flyhelirus also has the 'bulk packs' of gear in stock.

Some folks have been putting an additional tail stab mount collar against the boom block to help maintain the adjustment. I think grinding down some material from both halves of the block (and aluminum spacers) yields better results. The belt needs about 3 adjustments before it settles, so be aware of that. My belt adjustment holds great with no mods, but I'm using the MIP tool, which I think makes a BIG difference.

If you haven't installed the 2MM tail bearings, I'd recommend you do that first - tail becomes much more manageable. 2nd thing would be to nix the 420 tail servo. A DS290G does a much better job. Don't keep crashing because of Align's inability to produce a kit without issues.

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T-REX 250 › Maidened 250! First Crash! (Updated)
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