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RE: Mini Titan thread - 2/21/2008 4:16:43 AM   
jnich



Posts: 17
Joined: 1/9/2008
From: Deerfield Beach, FL, USA
Status: offline 		thanks - I get that good feeling about the4 MT from yours and others' post - the only thing that sort of worries me is that doing an online search - I was surprised as to how many usual vendors do not seem to carry it - makes me worry about parts as well - I hesititated to ask because I never can't find source - but what is a great vendor for the MT? here, in the states

quote:

ORIGINAL: osterizer

I don't think the MT is more stable, per se. It is a more compact design along the roll axis than the "classic" stacked frame helis, so its control response is more direct, which just makes it more predictable, and yes, easier to fly.

Pros and cons I don't want to get into, really- there are enough religious wars about my heli is better than yours -but the MT has just impressed the heck out of me and the folks I know that have bought it. I was on the edge of buying a v2 TRex, but tried the MT instead and I'm a total fan. Others I know who have various versions of TRex have tried it, and all compare the MT favorably to the TR. When the MT costs a fraction of what the TRex does, flies well, and is easier to maintain....



< Message edited by jnich -- 2/21/2008 4:17:26 AM >

_____________________________

i now bring my lipos to work with me to get them charged up for immediate flight after work

(in reply to osterizer)
       Post #: 251

RE: Mini Titan thread - 2/21/2008 4:34:04 AM   
Super D


 

Posts: 701
Joined: 3/27/2005
From: Athens, TX, USA
Status: offline 		Well said Oster
I've researched who had the best price and Amainhobbies was unbeatable, For the Kit, For parts I like heliproz. Rather than buy spare parts I just bought an extra kit for $129, then I had one of everything extra. I'm very pleased with mine, and my Trex 450 SE hasnt been flown in months.

_____________________________

Keep working, the millions on welfare depend on you!

(in reply to jnich)
       Post #: 252

RE: Mini Titan thread - 2/21/2008 5:45:34 AM   
osterizer


 

Posts: 1466
Joined: 3/10/2007
From: Sykesville, MD, USA
Status: offline 		Thanks, SuperD.

For parts, AMain, HeliProz, and HeliDirect are where I usually look. My first look is heliproz because they support the Thunder Tiger helis pretty well, and I'm thinking about buying one of their Raptor kits- they have some very good combo deals. For the Mini Titan specifically, HeliDirect is a good place to go-- they're a good company with very good customer service, and I would go there first for most things. There are some pieces for the MT that they don't stock though, and I go to HeliProz for those, and HP will be my first choice, instead of HeliDirect, if I do wind up buying a glow Raptor.

[edit] Oh, and the MX450 XS is in good shape, and flying just fine . It's not going to the mothballs any time soon. [/edit]


< Message edited by osterizer -- 2/21/2008 5:48:37 AM >

(in reply to Super D)
       Post #: 253

RE: Mini Titan thread - 2/23/2008 6:26:56 PM   
ELC


 

Posts: 39
Joined: 1/31/2007
From: Oak Park, IL, USA
Status: offline 		How tight or snug should the main rotor & tail blade be? At the moment both blades, set-up by a exp. pilot, are quite tight, hardly able to move them. Would appreciate exlaination on the theory?
BOY this hobby is a steep learning curve, well for me anyway
Thanks for help on this.

(in reply to osterizer)
       Post #: 254

RE: Mini Titan thread - 2/23/2008 6:40:57 PM   
BarracudaHockey



Posts: 10231
Joined: 7/13/2003
From: Orange Park, FL, USA
Status: online 		They should stay put if you hold the heli on its side but move if you shake it.

They need to be able to lead and lag a bit or you will get vibration. Floppy loose and you can get a boom strike.

_____________________________

Andy - Helicopter Forum Moderator
AMA 77227 http://www.jaxrc.com

(in reply to ELC)
       Post #: 255

RE: Mini Titan thread - 2/24/2008 1:17:18 AM   
RC David


 

Posts: 239
Joined: 11/11/2007
From: Chicago, IL, USA
Status: offline 		Andy,

THANKS for that info. on the blade tightness. That might explain why my MT gets a little shaky when spooling up. If not, what do you guys think is causing it?

It DOES NOT shake at all once I get to a high enough RPM but when gradually increasing throttle, the whole heli gets the shakes at (I think) 2 different points on the throttle. I'm still only hovering so I'd have to describe it like this.

Approximately...

1-20% throttle- smooth
25% throttle- shaky
35% throttle- smooth
45% throttle- shaky
50% throttle- smooth
55% throttle- smooth (and hovering)
60% throttle- smooth (and gaining altitude)

Any ideas???

Also, after my first mini crash I tried Align white/red woodies. Three of the four training gear balls was vibrating slightly. On the next flight I put the newly assembled MT OEM blades on and the vibration was gone. I did balance the Aligns so not sure what the issue is. I have another set of black Align woodies to try but for now the OEM's get my vote.

There is still a "just barely" perceptible vibration to the front left golf ball but I'm not going to sweat it for that (unless you guys make me sweat it ;-) )

Dave D.

(in reply to BarracudaHockey)
       Post #: 256

RE: Mini Titan thread - 2/25/2008 10:19:01 PM   
BarracudaHockey



Posts: 10231
Joined: 7/13/2003
From: Orange Park, FL, USA
Status: online 		They all go through ressonance when spooling up.

Make sure your flap dampeners in the head have some grease on them but lower rpms cause wobbles.

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AMA 77227 http://www.jaxrc.com

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       Post #: 257

RE: Mini Titan thread - 2/26/2008 2:11:46 PM   
redvtr1000


 

Posts: 725
Joined: 6/29/2007
From: covington, GA, USA
Status: offline 		Like BH said, a bit of the shimmies during spool up isn't bad. If you had the balls on your training gear vibrating slightly, I would lean toward a small imbalance somewhere.

How did you install the align blades? Did you use spacers?

Check your paddles, if they are slightly out of alignment you could get some wobbles and not really see it.

Did you have the shakes on spool up/down before your first crash?

I replaced my stock plastic head with the Kasama and threw on a set of radix blades. No vibrations. Sometimes it will vibe a bit spinning up, but its barely noticeable.

(in reply to BarracudaHockey)
       Post #: 258

RE: Mini Titan thread - 2/26/2008 7:06:11 PM   
RC David


 

Posts: 239
Joined: 11/11/2007
From: Chicago, IL, USA
Status: offline 		Thanks BH and red.

I'll have to check the flap dampeners but the heli only has a dozen flights on it so I'd hope they are still lubricated.

Only one training ball is "very very slightly" vibrating.

I did use the Thunder Tiger spacers when I tried the Align blades.

The paddles should be in alignment but I'll double check them.

I had the same shakes on spool up/spool down before the first crash too.

Just curious as I had a T-Rex guy tell me that T-rex's don't shake/vibrate like that. (NOT a proud moment)


I'm sure I will eventually replace the head/blades with premium stuff but not until this newbie can fly all directions which might take some time ;-)

Dave D.

(in reply to redvtr1000)
       Post #: 259

RE: Mini Titan thread - 2/26/2008 7:24:50 PM   
redvtr1000


 

Posts: 725
Joined: 6/29/2007
From: covington, GA, USA
Status: offline 		If it just gets a couple quick wobbles while it goes up or down in rpm I wouldn't worry about it. Even if a ball on the training gear is slightly wobbling. From what you describe, I think your heli is running just fine.

I lubed my dampers with vaseline when I installed originally and during maintenance but most of it seems to get squeezed out installing the feathering shaft. Tri-flow or some of that silicon dielectric grease you can get at auto parts stores will work as well.

I've seen t-rex helis do the same thing so I wouldn't worry about that. I used mine with the plastic stuff forever and flew fine for me. I've got a friend that flies a nicely equipped trex, I let him take my MT up when we get together IMO it makes his flying look more precise and smooth.

Biggest contributor to the shimmies I have seen with my MT is the tracking. If it is even slightly off I think the spool up/down was worse for me.

(in reply to RC David)
       Post #: 260

RE: Mini Titan thread - 2/29/2008 5:09:09 AM   
RC David


 

Posts: 239
Joined: 11/11/2007
From: Chicago, IL, USA
Status: offline 		Thanks.

I will keep it as is for now and just PRACTICE...

Now, per your comment on the other new MT owner thread, where did you get that AXI cooler/heatsink? I really think I should get one for my MT as all I'm doing is hovering at mid throttle so I know that can't be good for the brushless motor.

Can you give me exact model numbe and where you ordered from?

THANKS AGAIN!!!


Dave D.

(in reply to redvtr1000)
       Post #: 261

RE: Mini Titan thread - 3/9/2008 8:59:49 PM   
RC David


 

Posts: 239
Joined: 11/11/2007
From: Chicago, IL, USA
Status: offline 		Ok guys, I need some advice (HELP) here.

I went to fly my MT Sat night (after 4 successful flights on Fri) and when I spooled her up, something went wrong and I never made it off the ground. Turns out a mixing lever (mixing arm) broke. Don't ask me how I trashed the training gear and cracked the frame mounts again but DID NOT break a blade.

I was planning on buying the new aluminum mixing levers but not sure if the Thunder Tiger part PV0805 or the G-Force made version (G-Force Mixing Arms M2 -MiniTitan- GFR2017) <http://www.heliproz.com/prodinfo.asp?number=882017> from Heliproz would be better?

The only difference I can see is that the G-Force arm is totally solid where as the TT part is hollowed out on one side.

I was thinking about upgrading the whole head to aluminum (Precision CNC Head System - Mini Titan E325) <http://www.helidirect.com/product_info.php?cPath=326&products_id=5250> but not sure if I can/should go that far at this time.

I also noticed that my upper bearing housing screws keep loosening slightly so was considering getting either (PV0810 Metal Brg Block E325) <http://www.heliproz.com/prodinfo.asp?number=142529> or <http://www.helidirect.com/product_info.php?cPath=326&products_id=5264>


What do you guys recommend? What other stock parts are prone to break easily?

I don't really want to upgrade any more than necessary because the cost will really start adding up and I'd rather save that money to put towards a mini-Titan SE this summer.

Dave D.

(in reply to RC David)
       Post #: 262

RE: Mini Titan thread - 3/9/2008 9:31:59 PM   
osterizer


 

Posts: 1466
Joined: 3/10/2007
From: Sykesville, MD, USA
Status: offline 		As long as they both fit and work smoothly and have the same linkage holes, you probably wouldn't notice a difference between the G-Force and TT arms.

The Sonix parts that Helidirect sells have good prices, but the ones I've gotten have taken some attention to make work smoothly. The tail I got was a steal at $55, but even so, when you say "CNC" I expect the parts to fit right away. On the other hand, they're a good hard alloy, so I don't expect to ever replace those parts.

A very little dab of CA on the screws may keep them where you want them. I wouldn't replace the bearing blocks for that.

(in reply to RC David)
       Post #: 263