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250 Class Electric Helicopters 250 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 11-09-2008, 10:32 AM   #1
Finless
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Default Trex250 Manual

Thanks to Helifreak user kenny.c for sending me the manual. Here is the manual just as it comes off the CD. It's a set of JPG scans.

Align Trex 250 Manual (12 Megs)

Here is the PDF version donated by Helifreak usere Bubber Jones

Align Trex 250 Manual in PDF (12 Megs)


NEW! Trex250 SE manual! Special thanks to HF user Average Joe for supplying it!
Align Trex 250 SE Manual in PDF (4 Megs)



Bob
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Last edited by Finless; 11-17-2009 at 10:53 PM..
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Old 11-09-2008, 05:56 PM   #2
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so Bob you going to get one?
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Old 11-10-2008, 07:42 AM   #3
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Thanks a lot.
I was looking for it.
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Old 11-10-2008, 04:27 PM   #4
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Thanks Bob! Just printed out..
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Old 11-11-2008, 10:56 AM   #5
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Just added a link to the PDF version of the 250 manual. Thanks to Bubber Jones for providing it.

Bob
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Old 11-11-2008, 01:24 PM   #6
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Quote:
Originally Posted by Finless View Post
Just added a link to the PDF version of the 250 manual. Thanks to Bubber Jones for providing it.

Bob
Bob someone above was asking if you are going to get your hands on one, Im curious myself. Any chance of seeing 250 build videos in the future?
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Old 11-11-2008, 01:32 PM   #7
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Probably not. I am not really interested in a heli this small. I have no where in my area with an indoor flying area and for me living near the coast we always have pretty good winds so it would not get flown much.

If Align asks me to and supplies everything needed then I would probably go ahead and do it just to help out people getting this heli. BUT currently I have a back log so even then it would not be until the beginning of the year.

Bob
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Old 11-11-2008, 02:01 PM   #8
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thanks for answering....i know in the summer someone asked the same question and you replied almost the exact same answer and reason as you did here.....just wanted to make sure though!


EDIT: Actually i had put aside about $800 in the summer for this heli, but after flying the gaui 200 last week, i really do not like the feel, size of these 200/250 size heli's.......

I decided to buy another plank(QQ Somenzini 49" Yak) and the rest of the money goes towards making my Trex 700 FBL.....i am proud of my decision.
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Old 11-11-2008, 02:09 PM   #9
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Quote:
Originally Posted by Finless View Post
Probably not. I am not really interested in a heli this small. I have no where in my area with an indoor flying area and for me living near the coast we always have pretty good winds so it would not get flown much.

If Align asks me to and supplies everything needed then I would probably go ahead and do it just to help out people getting this heli. BUT currently I have a back log so even then it would not be until the beginning of the year.

Bob
I appreciate the honesty. If Align doesn't offer a kit and all components in exchange for build review and videos they are nuts. I'm sure you generate a ton of business for them!
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Old 11-11-2008, 02:34 PM   #10
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thats why i feel Horizon Hobby/JR are nut cases.....

A) Ask Bob to do videos on some of their heli's
B) Send Bob Vibe 50, Vibe 500E, and Vibe 90SG with most electronics included, if not all.
C) Bob will be a happy but busy man....
D) Bob post build videos
E) Sales would, at the very least double if not more.



poor marketing if you ask me.
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Old 11-13-2008, 09:01 AM   #11
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Very honest Bob,

re:

Quote:

Probably not. I am not really interested in a heli this small. I have no where in my area with an indoor flying area and for me living near the coast we always have pretty good winds so it would not get flown much.

If Align asks me to and supplies everything needed then I would probably go ahead and do it just to help out people getting this heli. BUT currently I have a back log so even then it would not be until the beginning of the year.

Bob
With a great degree of self, The relevance of whether or not the 250 will get increased sales is pales in significance, when it comes to your geographically less than stategic significance when it comes to challenging and windy situations, not to mention as we age things that are small appear smaller and of course faster.

I have privilege to be of first hand experience to absolutley acertain the above facts. You are definately, "A Man For All Seasons". I commend you for your stoic resolve and absolute resolution to not deviate from any verbal colonostic refraction therof rendering your innermost sanctions to be such as unattainable by any means other than surgical.(I am sure JK will send u one) I take my hat off to you Bob.

Cheers Chris
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Old 11-15-2008, 12:09 AM   #12
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um,

Ya dude, well said.

So,,,.... Bob, are you going to do a build vid?

lol
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Old 11-15-2008, 07:53 AM   #13
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Old 11-15-2008, 08:18 AM   #14
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...
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Old 11-18-2008, 07:31 AM   #15
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just watch the trex 450 build vids. it's basically the same thing half the size
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Old 11-18-2008, 08:04 AM   #16
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Hi bob,

I just did a new version of the PDF manual with the production manual (other one is pre-series)

Please find it there to share with all the HF members:

http://www.gamani.org/trex250/TREX250MANUAL.pdf

Cédric
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Old 12-03-2008, 01:54 AM   #17
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One thing has been bothering me since I learned that the bolt length change seemed to fix things. People are using the term "preloading" to, as far as I can tell, say that the bearings have a lateral load on them due to the bolts clamping the inner race against the hub instead of bottoming out and leaving a little wiggle room.

I understand preloading to mean that the inner race is pulled one way (by the bolt) while the outer race is forced the other way by the grip. If this was the case, the grip wouldn't turn at all since the grip would be pressed against the hub.

If you look at the picture (I know, I'm putting too much thought into this), the inner race of one bearing is clamped between the hub shoulder and the washer, the other between the washer and the bolt head. The outer race is contained by the grip. There shouldn't be any preloading caused by this configuration.

I understand the main that has been identified by Align and by people in this forum, but I'm wondering if this preloading could have even been a factor?
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Old 12-06-2008, 03:25 PM   #18
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I'm happy to do build videos on helicopters that aren't free... check the forum for my thread about it. Should be done with them some time this week. Will be following the build thread on here and using the good old noodle a lot

This heli is very similar to the Trex 450, so the same principles apply - build it straight, make right angles, use thread lock, same radio set up and servo centering, swash leveling, etc... just you might have to break out the reading glasses cuz it's so small
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Old 12-10-2008, 12:48 AM   #19
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Ferret30,

You are absolutely correct. The original twin-bearing blade grip setup has absolutely no preloading capability. It's simply two bearings with a spacer between to prevent the bearings from interfering. As you said, the only way you could preload this setup is to force the blade grip against the hub shoulder, in which case the grip wouldn't turn. I think Align did this to 'widen' the bearing area, thus adding more stability. No preloading, though, and the slop of the grip is determined by the slop in the bearing races.

Heim's "custom spacer" video explains how to solve this problem. It's much the same, but instead uses a larger spacer outside the inner spacer, which sits against the bearings' outer races. In this setup, with a slightly narrower inner spacer (he uses a crushable one), you are basically sandwiching the bearings together, slightly more with middle races, which preloads the bearings much like the hub of a bicycle wheel.

I actually did Heim's preload experiment in a very crafty way. I took the balls out of an old bearing, which left just the inner and outer race. I used this as my set of inner and outer spacers between the two bearings in the grip. I slightly ground the inner race/spacer (since it isn't crushable) using fine emery sand paper. This moved both inner races on either side a bit closer together, and the outer were separated by the spacer provided by the scrapped outer race. So, my whole stack is 3.6mm wide. Two 1.2mm bearings, separated by a 1.2mm set of spacers which were previously a bearing. I used the longer screw that was for the blade grips to secure the stack inside the grip.

Result: perfect preload. No slop in the grip, no play, and the grip spins like a top.

The new tail hub kits with the single 2mm bearing won't provide any preload, either, unfortunately. Neall
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Old 12-10-2008, 12:59 AM   #20
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Ferret30,

To answer your last question, it's my understanding that preloading (or lack of it) was never an issue with the tail, and didn't lead to the tail hub redesign. After all, as you point out, the original hub setup didn't have any preloading, nor does the new hub Align's sending out with the single 2mm bearing.

Instead, the binding issue stemmed from really crappy 1.2mm bearings that couldn't handle the side (lateral) load. That is, once up to speed, some tails had binding issues simply because of the side load put on the bearings due to centripetal force. It's possible the new 2mm bearings will be better with side load issues, simply due to the bigger balls and larger races. However, if the 2mm bearing is crappy, too, it may still bind when dealing with heavy side loads.

Heim's 'sandwiched' techique for preloading will better tolerate side load issues, because the side load fights against the preload, instead of pulling against the bearing races. By the way,that's why Heim recommends you actually preload the bearings before you do the Chinese weight mod. Those weights are going to add a butt-load of side force that a single (or non-preloaded set) probably won't handle. Consequently, Align's new tail hub assembly isn't going to be ideal for the Chinese weights. You may want to go back to a good pair of 1.2mm bearings and preload them. I think he's going to offer the preload kit, as well as the Chinese weights, exactly for that reason. Neall
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