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RE: Mini Titan thread - 1/2/2008 6:17:59 AM   
cactus hopper


 

Posts: 650
Joined: 11/17/2007
From: , AZ, USA
Status: offline 		I tried 100 degrees right trim and it didn't phase it. I have the collective servo reversed and both the aileron and collective servos set at -50 swash. Pitch is set at -1 degree with the throttle off. It acts like it is getting left cyclic mixed in with collective but the swash movement doesn't indicate that. I don't know what in the world is causing it and if my Hurricane 550 gets here tomorrow like it's supposed to I don't think I'm going to care.

_____________________________

I don't fly em, I just build em, saves me a lot of money in repairs that way.

(in reply to osterizer)
       Post #: 151

RE: Mini Titan thread - 1/2/2008 6:58:11 AM   
osterizer


 

Posts: 1466
Joined: 3/10/2007
From: Sykesville, MD, USA
Status: online 		Well, sorry I can't think of anything else-- the cross mixing sounds plausible, but strange . If you find the cause, do please let us know.

(in reply to cactus hopper)
       Post #: 152

RE: Mini Titan thread - 1/2/2008 10:09:43 AM   
redvtr1000


 

Posts: 725
Joined: 6/29/2007
From: covington, GA, USA
Status: offline 		Hmm,

I think you really ought to take a good look at the whole swash setup on that, depending on your skill level it may or may not be a setup problem. If you have hovered with any proficiency before, stepping into the mt with a proper setup should be no problem. If that is the case, I would think the problem is with your setup.

Check that your servos move in the right direction? When you give a right aileron input, the swash drops on the right side (viewed from the rear), if not you need to do some reversing. I run the mini-titan on a dx7, if you can't get it figured out, I would be glad to get on the phone with you and walk through the menus and we can doublecheck to make sure yours is set similarly (we can do it by email/pm as well if you think that your problem is in programming and that would be better for you).

You do have to go through the manual and make the adjustments at full neg and pos pitch to eliminate any interaction that would unlevel the swash at it's full travel but even if your problem stemmed from this I don't think it would cause the heli to be so unmanageable that you couldn't get a hover out of it.

Don't give up on your MT yet, that hurricane is gonna be nice but the MT is great and uses half the battery so you can get double the flights vs the hurricane.

(in reply to osterizer)
       Post #: 153

RE: Mini Titan thread - 1/2/2008 7:36:59 PM   
cactus hopper


 

Posts: 650
Joined: 11/17/2007
From: , AZ, USA
Status: offline 		I'm sure it's just a radio setup problem, I"ll get it eventually even if I have to wear the paint off of the mode and select buttons. Probably a combination of that and not being broke in. What is the best blade replacement for the ones that are on it. I remember somone saying something about Align blades and a shim but I can't find the shim anywhere.

_____________________________

I don't fly em, I just build em, saves me a lot of money in repairs that way.

(in reply to redvtr1000)
       Post #: 154

RE: Mini Titan thread - 1/3/2008 12:42:43 AM   
osterizer


 

Posts: 1466
Joined: 3/10/2007
From: Sykesville, MD, USA
Status: online 		Ya, you'll get it.

I'm a huge fan of the SAB 320s at 2500 and below, or Radix 325s at 2500 and up. You can get either at helihobby.com, and they have some number of spacers, too. They used to have nylon ones that looked good, but I can't find them now. RcSuperSales.net also has some for sale, but I haven't tried them yet (http://store.rcsupersales.net/servlet/-strse-RC-Fasteners-cln-Washers/Categories).

The SABs are a good high-lift blade with a thick cross section that works great at lower speeds; the Radix are thinner, with a sharper, reflex airfoil that doesn't make for as much drag at higher head speeds.

(in reply to cactus hopper)
       Post #: 155

RE: Mini Titan thread - 1/3/2008 4:31:40 AM   
cactus hopper


 

Posts: 650
Joined: 11/17/2007
From: , AZ, USA
Status: offline 		I think I finally got it. I unplugged everything and then plugged in one servo and worked on it until it did what it was supposed to do, then went on to the next servo. I still don't have any idle up but that's ok, I won't be needing it for quite some time if ever. Could it be that in addition to not having sub trims this whiz bang futaba radio doesn't have the capability to program negative pitch in? It cost me a set of $16.00 blades but I now understand swash throttle mixing too.

_____________________________

I don't fly em, I just build em, saves me a lot of money in repairs that way.

(in reply to osterizer)
       Post #: 156

RE: Mini Titan thread - 1/3/2008 4:45:30 AM   
osterizer


 

Posts: 1466
Joined: 3/10/2007
From: Sykesville, MD, USA
Status: online 		Not at all. The negative pitch comes from the way you set up the servos and the AFR numbers.

Short version:
- set a linear pitch curve (0-25-50-75-100) and put the left/collective stick at center
- disconnect the motor, make sure the tx is on and plug in the heli
- unscrew and center the servo arms, put the screws back in
- set the PI (pitch) AFR to +50
- verify that you have zero pitch and level swash at mid stick with the servo arms level (adjust servo to swash links as needed)
- move the collective stick up; if you get negative pitch going up, change the PI AFR to -50
- using your pitch gauge, adjust the AFR number up or down to get 20 degrees total range of motion up and down (+/- 10 degrees)
- recheck that you have zero pitch at center and adjust as needed.

< Message edited by osterizer -- 1/3/2008 4:46:51 AM >

(in reply to cactus hopper)
       Post #: 157

RE: Mini Titan thread - 1/3/2008 5:26:43 AM   
cactus hopper


 

Posts: 650
Joined: 11/17/2007
From: , AZ, USA
Status: offline 		Thanks once again Osterizer, I never would have figured that one out. I found some nifty blade spacers at eboyztoyz.


_____________________________

I don't fly em, I just build em, saves me a lot of money in repairs that way.

(in reply to osterizer)
       Post #: 158

RE: Mini Titan thread - 1/3/2008 5:57:31 AM   
osterizer


 

Posts: 1466
Joined: 3/10/2007
From: Sykesville, MD, USA
Status: online 		No prob, man. If that was your normal curve you were setting it up with, btw, don't forget to raise the first two points up after you're done or you'll be screwing the heli into the ground when you need to spin down . (something like 42-46-50-75-100 is what I wind up with)

(in reply to cactus hopper)
       Post #: 159

RE: Mini Titan thread - 1/3/2008 12:38:58 PM   
redvtr1000


 

Posts: 725
Joined: 6/29/2007
From: covington, GA, USA
Status: offline 		Nice post osterizer, I have mine all setup but you really summed it up well there and I wish someone had explained the swash travel in that manner when I went through it. I took a good bit of time figuring all of that out during the setup stages.

Cactus, FYI, I used the curves exactly as they are explained in the manual for the MT. I copied the numbers straight out of the manual and my bird flew pretty well set that way. When I first built it, I followed that book well and set all the linkages as defined in the manual. Never actually threw a pitch gauge on it at first and it flew fine. Lock your flybar and then throw a gauge on it while you adjust that afr for pitch and you should be pretty close going off the book though you might tweak a bit.

Align blades have worked pretty well for me, the spacer you want is part number TTRPV0829 (thunder tiger part)

Link here --> http://www.amainhobbies.com/product_info.php/cPath/2_378_572/products_id/16223

I have a set of the carbons and the fibreglass (14.99 or so per set) but the woods have actually performed a little better IMO and they are like 12.99 a set. Cheaper than the TT woodies and they fly better. I have been screwing with the tracking on mine again lately, I found one loose ball on one of the washout arms the other day. It was about ready to fly off so I guess I got lucky.

Tightened everythign up in the head and it still has a slight rythmic bobble that is noticeable mostly through the skids. The tracking is off just a very small tad. Barely noticeable when you look at the disk while spinning. I think I'm going to skip work tomorrow and spend the day flying/tweaking. If I don't get it sorted tomorrow, the whole head is coming off and I am going to throw on the Kasama. Got a JGF500 that I will throw in at the same time.

(in reply to osterizer)
       Post #: 160

RE: Mini Titan thread - 1/4/2008 7:16:59 AM   
cactus hopper


 

Posts: 650
Joined: 11/17/2007
From: , AZ, USA
Status: offline 		I ordered one of every 325 and 335mm blades that eboyztoyz has and they have quite a selection, some as low as $6.00 a pair, I'll use those to finish scraping the peeling paint off of my shed at about 3,200 rpm. I'm going to spend tomorrow super tuning it and checking everything twice, then I'll see if I can get a hover out of it. I got my Hurricane 550 today, that thing is a beast, it dwarfs the mini titan. I may put the motor out of it in my Honda wagon until I get another receiver and some servos for it. My first impression is that the bigger they get the better they are. My fleet is almost complete now, except for a 620 something, maybe trex and a copterx v2, I'll have to wait and see how big my income tax refund is.

_____________________________

I don't fly em, I just build em, saves me a lot of money in repairs that way.

(in reply to redvtr1000)
       Post #: 161

RE: Mini Titan thread - 1/5/2008 1:20:14 AM   
osterizer


 

Posts: 1466
Joined: 3/10/2007
From: Sykesville, MD, USA
Status: online 		Hehe, ought to take you until 2009 to get through all those blades. The Hurricane sounds nice.

(in reply to cactus hopper)
       Post #: 162

RE: Mini Titan thread - 1/5/2008 2:11:45 AM   
cactus hopper


 

Posts: 650
Joined: 11/17/2007
From: , AZ, USA
Status: offline 		I dunno, the blades that came with it sure didn't last long, that was because of a bad case of brain fade though. Ten sets should last awhile. I got the batteries for the Hurricane in today. 3200mAh 3S cellpro, 270 whopping grams apiece, I don't guess I'll be using those in the mini titan.

_____________________________

I don't fly em, I just build em, saves me a lot of money in repairs that way.

(in reply to osterizer)
       Post #: 163

RE: Mini Titan thread - 1/5/2008 5:26:59 AM   
osterizer


 

Posts: 1466
Joined: 3/10/2007
From: Sykesville, MD, USA
Status: online 		well, if you're in the habit of breaking them, save the Radix for last. They're the best of the bunch.

(in reply to cactus hopper)
       Post #: 164

RE: Mini Titan thread - 1/7/2008 5:34:35 AM   
Super D


 

Posts: 701
Joined: 3/27/2005
From: Athens, TX, USA
Status: offline 		What would be the pinion of choice for the stock motor and esc? I just do FFF and some basic 3D. I just ordered one from amainhobbies.

Thanks Dylan

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