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Home✈️Aircraft🚁Helicoptere-Elec-Helicopters New or Limited ActivityArk › Mx400 Tail Setup/Rotation
01-10-2006 12:42 PM  13 years ago
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jaless

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Howell, MI

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Mx400 Tail Setup/Rotation
Being new to RC helicopters of any kind I read as much information as I can find on this subject. I found something new yesterday that I believe is very important and it was kind of hidden away. If you go to the T-Rex build thread http://www.trextuning.com/ and look at Build setup step 21, the last sentence in the paragraph reads,

{Quote] "The tail blades should be spinning such that the lower blade should be rotating forwards towards the nose of the heli and upwards towards the blades. Also make sure that your ball links on the tail blade holders are leading and not trailing the tail blades."

The point about the ball links leading the tail blade holder was something that I never thought about. The pictures in the build thread shows this very well but I'm not sure if my MX400 came that way or I inadvertently changed it at some point. Please let me know if your MX400 was set up this way or if it was different. This little bit of information changed my whole Gyro/Transmitter setup but it works much better now.
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01-10-2006 01:23 PM  13 years ago
jaless

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Howell, MI

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Me again,
Just looked at the X400 build thread,http://www.x400tuning.com/index.htm and it is set up the other way, with the ball links following the tail blade. Is there a correct way to do this or will either way work?

Joe
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01-10-2006 01:25 PM  13 years ago
dkshema

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Cedar Rapids, IA

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There's a thread way back here where someone else points out that the MX seems to have the TR grips flipped over from what they should be, and that there is one pic in the manual that shows them right, the rest of the manual shows them backwards.

There are also some threads here that indicate that flipping the grips on the TR so they are like the T-Rex -- leading edge -- gives you much better control of the tail.

I'd go with the leading edge control, and remember to reverse your servo and gyro, since going with leading edge control will reverse the sense of the TR. With LE control, the servo needs to PULL the pushrod forward for a commanded right turn.

Dave
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01-10-2006 02:33 PM  13 years ago
jaless

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Howell, MI

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Thanks Dave,

I will look for the thread. I found out about the Gyro and servo when I fired it up after changing the links. Boy things can get exciting in a hurry when the Gyro is backwards.

Joe
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01-11-2006 12:59 AM  13 years ago
BikeNBoatN

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Santa Ana, CA USA

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I set up my MX400 tail to be like the TRex. Ball links lead, tail rotor spins up into main blades, replaced white tail blades with Trex tail blades, used Trex parts to mount my tail servo on the boom, used more TRex parts to replace the flexy wire pushrod with stiff CF pushrod, and used some more Trex parts to replace all z-bends on the servos with ball links. I figure all those TRex pilots can't be wrong.

The rest of the heli is pure MX400 though.

Brent.
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02-21-2006 10:07 PM  13 years ago
OPEXMAN

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Gloucester County, NJ

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using trex tail blade holder on mx400
will the aluminum trex tail blade holder fit on an mx400? the local hobby shop stocks trex parts but have the MX400, the little plastic ball on the blade grip keeps breaking off.
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02-22-2006 02:42 AM  13 years ago
LThibad

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Albuquerque NM.

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OPEXMAN
yes they will, I`ve been flying my MX400 as an MX-Rex
for almost as long as i`ve owned the heli.
I have found the microheli parts to be exceptional in
quality although a little expensive, but I`ve always
belived that you get what you pay for.
Larry.
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02-22-2006 03:12 PM  13 years ago
Soniq7

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Sacramento CA

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Ive read on here somewhere that the tail rotor will perform the same regardless of rotational direction. Seems to be more a phenomenon on larger helis according to the author.
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02-23-2006 01:37 AM  13 years ago
NEM3

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New Lenox, Il

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Could some of you guys explain to me why you are running the TRex tail blades. I work at my LHS on Saturday's and I compared the MX to the Trex blades. And not sure if there were the same size. If I remember correctly they are slightly smaller than the MX tail blades. But I know for sure that the TRex blades were much more flexible.
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02-23-2006 02:40 AM  13 years ago
Terry1229

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North Idaho

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I run the Trex, because that what is available locally...Thanks: Terry
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02-23-2006 04:21 AM  13 years ago
LThibad

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Albuquerque NM.

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NEM3
The reason i`ve been using the trex blades is because their
plastic material isn`t as brittle as the MX 400 plastic.
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02-23-2006 07:50 AM  13 years ago
NEM3

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New Lenox, Il

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that I will agree with
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02-23-2006 02:28 PM  13 years ago
Soniq7

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Sacramento CA

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Funny thing is, Im still on my original set of tailblades. From rookie pilot all the way to FF Ive had no trouble with the tail. I do clean grass stains off them quite frequently though..
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02-23-2006 04:42 PM  13 years ago
Squirrlybird

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Suffolk, Va US

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I am also on my original set. I have replaced the tail grips many times, but never the blades. I did boil them for about 20 minutes before their first use though. I dont really know if that made a difference or not (they have never broken). They sure get the abuse though. I have crashed tail first 3 times so far as well.
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02-23-2006 11:55 PM  13 years ago
Dennisu

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Langley, B.C. Canada

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My MX-400 came assembled but when checking it I discovered that if you set up the tail rotor blade holder as link leading you have more authority to make the heli turn right(against normal torque) than when the blade holders are set up as link following. Also when you slide the blade holder out on the shaft you can get as much right turning power, to counteract any main rotor blade set/motor combination torque, as you want. The blades can even get into a "feathered" position, the only thing necessary to allow you to do this is have a new pivoted link slider assembly. (ARK-240)
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02-25-2006 12:56 AM  13 years ago
OPEXMAN

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Gloucester County, NJ

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Boom strikes
I had my first Boom strike the other day and can't for the life of me figure out how it happened! does anyone know the mechanics of how this happens? I had to repair the tail rotor grips and straiten the shaft. I'm not cheap, but some of these parts can easily be fixed, and I'm also having a hard time finding the parts locally.
After the boom strike i had a dent and a little bend in the boom. i took a 1/2 inch dowel and stuck it in an electric drill and sanded it down so it fit tightly inside the boom. then i heated the boom and jammed the dowel into it. the dent is gone and now it's straight as an arrow. Also, has anyone noticed that the stock tail linkage on the MX400 is a tiny bit too short? I'm thinking of cutting it and using a set of collars and inserting a 1/2" piece of linkage in there. maybe I'm missing something?
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