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Other › Building my T-Rex, a couple ?'s
02-10-2006 06:17 AM  12 years agoPost 1
CHOMP

rrApprentice

Vancouver WA USA

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I’m into the building process on my XL HDE, wow it’s quite a bit of work! I’m very thankful for all you guys and the info on RR. Trextuning.com. has been valuable; I would have a tough time with just the manual that came with it. They should definitely come up with a little more detail.

All in all it’s going pretty well, but there are a couple of things I’m not sure about.

- The nut/bolt that I used to hold the main shaft to the main rotor housing is a hex head cap screw that is threaded the entire length. In the manual (HDE/CDE pg 5 part#37) it shows it only threaded part way with a smaller head. Do I have the wrong screw?
- The head seems to move silky smooth. However, right near the point where the swash gets to the low end of its travel there is a slight drag. It’s very slight and you have to be moving it real slow to feel it. Should this be investigated?
- I put the frame together tonight. The tail drive gear is smooth, but if I give it a hard spin it won’t keep spinning on its own. It moves more like the volume dial on a stereo (that’s about the only thing I can think to compare it to). Does that sound right?

Any input will be greatly appreciated.

Instructor: Don’t you know anything? Newbie: I don’t even suspect anything!

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02-10-2006 06:57 AM  12 years agoPost 2
CHOMP

rrApprentice

Vancouver WA USA

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Thanks for the quick response finless.

I had already put a little bit of the silicone grease on the pins where the wash out base slides on. I just undid some of the ball links and it seems that maybe it’s where the pins hit the joint in the washout base (it looks like two pieces joined together to make the washout base). I squeezed the pins toward the shaft a little bit and that helped it. I don’t think it’s a problem. What kind of oil do you use on yours?

I backed the screws off around the tail drive gear/bearings and it did loosen up, but it still won’t spin on its own. With the size of it there probably isn’t enough inertia to keep it spinning on it’s own. Once again I don’t think it’s a problem.

Thanks again…… better go see what comes next.

Instructor: Don’t you know anything? Newbie: I don’t even suspect anything!

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02-10-2006 08:06 AM  12 years agoPost 3
CHOMP

rrApprentice

Vancouver WA USA

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1 Z bend?
Why does the T-rex XL have a Z bend for the tail servo connection? There are ball links everywhere else, is there some reason not to have one here?

I made a homemade tail push rod out of an old tail drive shaft on my Shogun. I put ball links on both ends and It seems to work well.

Instructor: Don’t you know anything? Newbie: I don’t even suspect anything!

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02-10-2006 01:45 PM  12 years agoPost 4
catfight

rrKey Veteran

USA

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chomp,

Align actually provides the ball and threaded rod (in your "spare parts" collection) to do that - I just assembled mine a few weeks ago and found that to be the case.Works well with that configuration.

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02-14-2006 01:21 AM  12 years agoPost 5
CHOMP

rrApprentice

Vancouver WA USA

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I have my T-Rex head, frame, and tail section built and put together.

When the tail case goes onto the boom there is a peg on the inside of the tail case that goes though the hole in the end of the boom. On the other end of the boom there is a slot in the boom and a peg in the main frame that goes into the slot as the boom slides in.

When I look at the heli from the back the tail case is tilted a little to the right. In other words it is not lined up with the main shaft. It looks like I need to rotate the boom a few degrees counter clockwise to line it up, but with the peg/hole/slot setup it isn’t possible.

Is this how it’s designed? Shouldn’t the tail rotor be perpendicular to the main blades when everything is centered?

Instructor: Don’t you know anything? Newbie: I don’t even suspect anything!

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02-14-2006 02:01 AM  12 years agoPost 6
lbowen

rrApprentice

York S. Carolina-USA

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If your belt is to tight you will not spin easily and this eats power.

lbowen

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02-14-2006 02:06 AM  12 years agoPost 7
catfight

rrKey Veteran

USA

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Chomp,

I just took a look at mine and I think you are right- it is tilted a little to the right - but mine flies just fine - must supposed to be that way? It only looks like a .5 or 1 degree tilt to me (no calibrated eyeballs)

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02-14-2006 02:15 AM  12 years agoPost 8
lbowen

rrApprentice

York S. Carolina-USA

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Take a look at the Apache mil. chopper - it has a VERY tilted tail blade - and with a clock rotor head that slight tilt may help counter the cc rotation - that would be clever designing by Align.

lbowen

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02-14-2006 02:16 AM  12 years agoPost 9
CHOMP

rrApprentice

Vancouver WA USA

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I just talked to the LHS guy and he said if it’s only a degree or so he didn’t think it was a problem. He offered to take a look at it, but he’s 40 minutes away. I think it will be fine, next time in the hobby shop I’ll have him take a look.

On my shogun there is no peg and hole set up so it can rotate all it wants. When ever I do any maintenance on the tail I always line it up with the main shaft when I tighten it back down.

Thanks for the responses.

Instructor: Don’t you know anything? Newbie: I don’t even suspect anything!

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02-15-2006 07:34 PM  12 years agoPost 10
CHOMP

rrApprentice

Vancouver WA USA

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I’m still working on building my T-rex 450XL HDE.

With all the talk of paddles hitting the gyro when mounted on top, I’m looking at different places to mount it. Also if it’s mounted in the most common spot (on top where the boom slides into the main frame) it may be in the way when adjusting the belt tension or removing the boom.

I have the GY401 and I’m thinking about making a bracket out of aluminum to mount the gyro on the front of the servo tray just above the battery. It looks like it will fit there and should get some protection from the canopy.

Has anyone with an HDE or 450X tried putting it up there?

Instructor: Don’t you know anything? Newbie: I don’t even suspect anything!

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