RE: Mini Titan thread (Full Version)

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osterizer -> RE: Mini Titan thread (12/24/2007 3:52:50 AM)

:) it'll have plenty of power to hover-- I've been thinking of trying a Scorpion, but I think it will be on the Poseidon. But BH is right- weight is the enemy, and one of the nice things about the Titan is how light it feels, flying. I don't know how much weight the blank from the canopy adds, but it doesn't take that long to cut it out.



cactus hopper -> RE: Mini Titan thread (12/24/2007 4:21:01 AM)

The cutout from the canopy weighs 8gm. I didn't think it would weigh that much.



osterizer -> RE: Mini Titan thread (12/24/2007 4:34:31 AM)

Thanks for posting that-- I was curious :). I'm probably going to waste at least that much with the aluminum head. I hope it will be strong enough to make up for it.



osterizer -> RE: Mini Titan thread (12/24/2007 10:12:37 PM)

So how many stories on RCU start, one way or another, with "the sun was going down, and it was really time to leave, but I figured I had time for One More Pack?" I almost had one of those for you folks tonight, but thankfully, not.

I had the MX450 (3S) out today to the field, but the wind was all over the place and I gave up after 4 packs. Later in the day, though, the wind died down and I took the Titan and went back. I flew two packs through it and had a ball. It really is that good-- FFF, backwards flight with rock solid tail, and flips and loops track perfectly. I even landed nose-in just because it was so easy. I only had one issue, and that was that at one point it seemed to mush a little bit and then snap back when I went from neutral to positive collective. Strange, I thought, but it flew perfectly otherwise and I kept going. Mistake!

So, I was thinking, I should go home, but I had One More Pack :D. Took it up, flipped to idle up, did one flip, OK, did another, and BLAM, passing through inverted I blipped negative collective and it jerked like someone hit it with a hammer! I rolled it back upright and flipped back to normal to drop the head speed in case it went out of control, but I was at about 60 feet so I figured I had a little time. I wiggled cyclic a little bit to see if I wanted to just plant it or fly it back, and it responded OK so I flew it back and set it down, smoothly as if nothing had ever happened.

I disconnected the battery, and started wiggling arms in the head to see if something was sticking; nope. Grasped the grips and turned them gently, just a little toward positive pitch to see if anything wiggled- snap!, and the port front servo stopped providing any resistance at all and just swung back and forth freely. O... M... G....

Just dodged a bullet, compadres, but don't know what kind it was-- whether the servo was going bad, or if that last snapping was a head part binding up and the shock when it let go stripped the servo. Either way-- there's a new set of gears and a careful going over for the servo, and whether it's Kasama or I get the TT allie head I asked for for Christmas, next time it flies it's with an aluminum head. I was spinning 2800+, and I know better than to do that with plastic, but it worked really well so far so I went with it. Still does, for that matter-- hover with a stripped cyclic servo was still smooth :). But let's not try that again......



dale691 -> RE: Mini Titan thread (12/26/2007 11:04:56 PM)

I am so confsed about what to buy Mini titan or the TRex? plese help. and I'd like to have the option of putting a scale fuselage on at some stage!



osterizer -> RE: Mini Titan thread (12/26/2007 11:45:28 PM)

Ha, that's easy-- get both of them! :) Dale, if AU is anything like the US, you can't walk through a LHS that does helis without tripping over all the TRex parts, a distinct advantage. They're good helis, lots of people fly them and get good results. The MT is a different ball of wax in construction, though; the body is a very sturdy, much better laid out (IMO) FRP (plastic) setup, and the components are all easily accessible for repairs. It's good and rigid, and flying it is a ball.

Which one's better? The one you like better, of course :). For me, there are a lot of helis with the same basic design and dimensions as the TR 450. I've had a few of them, and still have a carbon-framed MX450 on 4S power that I have a lot of fun with. I don't really care about LHS parts support, and I like the component layout and flight behavior of the MT better.

I doubt you'd be hating yourself for getting either one, really. For the above reasons, I'd vote MT, but on a TRex-oriented thread you'd probably get the opposite response.



cactus hopper -> RE: Mini Titan thread (12/27/2007 12:20:22 AM)

I bought the mini titan, and I'd do it again just for the simple reason that like eflite products I think Align products are overpriced. I gotta admit though, I'm starting to like the idea of not having to order absolutely everything online so I'm thinking about getting a copterx, they are supposed to be 100% compatible with trex. The other side of that coin is that there are about 14 hobby shops here, including three major franchises, Horizon hobby, Hobby town and Hobby Zone and none of them stock any Align parts, just Eflite. Kinda strange, all the hobby shops here are Specktum dealers but none of them stock Spektrum radios or servos, same with Futaba, you can't even buy an Align brushless motor at one of them much less anything else. I guess Eflite must have a stranglehold on them.

Just edited to add that I've got a mini titan in the air for less than $500.00 and that price includes a 6 channel 2.4 radio. I had to shop my guts out but I'd like to see you do that with a Trex.



patatchim -> RE: Mini Titan thread (12/27/2007 1:27:57 AM)

@ dale691

Previously i used to own a walkera 36#. I was tired of it, complete garbage, so i spent almost a year looking for a new electric heli (my budget is tight...).

Read a lot about the trex 450, good reviews, lots of spares, flies well... Basically what i was searching for.
So i went to the lhs and was pretty much decided to buy a trex, arrived there and the first thing i notice is the new mini titan. Asked about it, they replied to me "buy this one, flies like a big one", they spent so much time talking about it that got me convinced.

I can´t tell you if it flies great, because I don´t have much experience in flying. What I can tell you, is: materials are good, building it was fun, and it´s very crash tolerant (lol).



dale691 -> RE: Mini Titan thread (12/27/2007 9:52:07 AM)

Thanks for that guys I think the MT is the way i'm going to go, as I have a raptor E550 and I have had a 30V2, I love the TT heli's. The only thing I want to know more about is if there are scale fuselages that will fit the MT? I read a review somewhere that the MT is 12mm longer but I don't know where the measurements were taken from!



jwk72 -> RE: Mini Titan thread (12/28/2007 3:59:30 AM)

I just got my new MT ARF finished and am having a bit of a problem. The particular model I have is the one that comes mostly pre-built with ACE servos and this (IMO) silly CCPM mixer and gyro all in one. Apparently it is designed to be able to work with cheap 4 or 5 channel airplane radios, and I'm wondering if it might not work properly with my DX-7. As son as I try ti lift off the bird wants to take a HARD left. It was scaring me enough that I put the training gear on so it wouldn't tip over immediately. I've checked what I know to check and can't figure this one out. When I plug in the battery and all the servos center themselves, the swashplate seems level enough, at least enough that it should be able to be fixed in trimming. I've got it to the point where if I give it reasonable right aileron and rear elevator, it manages to... well... not crash, but it is a hell of a handful in a hover.

I've followed this thread on and off for a while and everyone seems to love the stability of this bird, that's why I bought it. Any ideas would be greatly appreciated. I actually work for a LHS so parts are not a problem, I was thinking of changing out the stock mixer/gyro for a Futaba 401 like what I have on my t-rex 450se V2, but would that have anything to do with the hard left turn?

-Jay K.



patatchim -> RE: Mini Titan thread (12/28/2007 2:57:38 PM)

@jwk72

Hi there, are you sure that you have the right programing of the swashplate? Are the servos right? *

I think that you should disconnect the motor and gyro and see how the swash moves. I am quite sure that the gyro has nothing to do with your problem.
If you have the manual, on page 38, it starts to explain how things should move (it helped me :D ).

*I am using the ace servos, had a similar problem, followed the manual and now is working right :D :D

In my case I had to reverse the servos.



jwk72 -> RE: Mini Titan thread (12/29/2007 2:14:43 PM)

patatchim,
That was my thought as well, I did not figure it could have anything to do with the gyro, but you never know. I did start to plow through the manual but have not gotten that far yet. At the recommendation of a few others, I bypassed the "mixing" unit with everything but the rudder to let my DX7 do it and now the right aileron servo is not working. I guess I have to figure out how to mis it in with the radio programming. Also, I did look at the swashplate movements and it seems to me that everything is moving in the right direction, I will check the manual today to be sure.

-Jay



cactus hopper -> RE: Mini Titan thread (12/31/2007 11:39:42 PM)

Houston.....we have a problem.
You guys are really going to get a kick out of this. I finally got to the point where I can install the radio, and after much trial and tribulation with swashmixing, swash AFR and the like I came to the conclusion that somehow I ended up with reverse, negative, polish pitch. In other words when the swash goes up I get negative pitch, when it is pulled down I get positive pitch. I have gone over and over the head assembly and I'm sure it is correct, the ball linkages are the correct length to within two one hundredths of a mm. I'm probably the only guy in the world that could have accomplished this. The only way I can get positive pitch when I throttle up is to cross the ball linkages from the main rotor hubs to the mixing levers.
Any ideas as to what the problem may be?????



osterizer -> RE: Mini Titan thread (1/1/2008 12:22:24 AM)

cactus-- the Mini Titan uses leading links on the grips; it's supposed to go negative when the swash rises. Put the links back the way they're supposed to be, and reverse the pitch mix in your radio CCPM setup and all will be well. The Titan is (thankfully) not a TRex clone.



BarracudaHockey -> RE: Mini Titan thread (1/1/2008 2:26:26 AM)

Did you read the review?[:D]

quote:

Another difference that I found was the delta arms are on the leading edge of the blade grips. This means that the swash plate will move down for positive pitch and up for negative pitch unlike some other designs.



osterizer -> RE: Mini Titan thread (1/1/2008 2:30:57 AM)

You could give him a link to it, BH :).

BTW, AMA 844528. What a span!



BarracudaHockey -> RE: Mini Titan thread (1/1/2008 3:37:56 AM)

I think he mentioned earlier he read it but here it is...

http://www.rcuniverse.com/magazine/article_display.cfm?article_id=932



cactus hopper -> RE: Mini Titan thread (1/1/2008 4:08:25 AM)

Thanks guys, that's a relief to know, I guess it's not a HBFP clone either because that's what I was using as a guide. I read the review but I'll read it again, when I read it I didn't know enough about collective pitch to understand some of it. One other question, I have a Futaba 6EX and my choices for swashplate types are 1-S, 3-S, and 3-E. from what I can gather the mini titan would be 3-S, do you know if that is correct?



osterizer -> RE: Mini Titan thread (1/1/2008 5:22:37 AM)

It is.



cactus hopper -> RE: Mini Titan thread (1/1/2008 6:17:06 AM)

I think I finally got it. I understand what you meant about not having sub trims now barracuda.



jwk72 -> RE: Mini Titan thread (1/1/2008 7:36:18 PM)

I sure am glad I decided to check email before I went crazy. I've been going nuts the past few days trying to figure out why the swash was going up instead of down, boy do I feel stupid[:@]! I still can't figure out why this thing wants to go hard left as soon as it gets light on the skids. The swash is level and it seems that everything (that I can think of anyway) is checking out, but it's kind of scary when this thing tries to go over.

-Jay K.



BarracudaHockey -> RE: Mini Titan thread (1/1/2008 9:19:11 PM)

Define "hard left" they will drift to the left because they are being pushed that way by the tail rotor, its called translating tendency, even the full scale ones do it, a trimmed hover will hang a bit to the right and it will need a bit of right trim to establish that. If its trying to roll itself over that might be another matter but none of them hover with a level swash.



jwk72 -> RE: Mini Titan thread (1/2/2008 2:52:49 AM)

Definition of this particular hard left is HAAAAAAARD left. With out the old training gear from my t-rex, it would just tip over before it ever left the ground on a normal (for me) slow "lift off". My T-rex 450 SE V2 has a nice gentle transition with very little "left". After a bit more tuning I can get it into a hover but have to hold a good amount of right stick and it is about as stable as a Blade CP if you've ever flown one of those. I'm lost...

-Jay K



cactus hopper -> RE: Mini Titan thread (1/2/2008 3:10:00 AM)

I've got the same problem with mine. It doesn't even get light on the skids, it just lays down on it's left side. I know it's not because the swash isn't level because I didn't just eyeball it, I leveled it with a laser level mounted on a tripod.



osterizer -> RE: Mini Titan thread (1/2/2008 3:49:34 AM)

How much swash deflection is required to hold it level? Have you continued the trimming process by dialing some right into the basic swash setup? I'd continue with that, but if it takes more than 3 or 4 degrees to trim it out, I'd keep looking for another solution.

Also assuming you've got the head "tuned up" and moving freely? That can take some time on this heli.



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