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Other › Mini Titan E325 Build Glitches and Tips Workshop
01-28-2007 02:08 PM  10 years agoPost 1
dleroi123

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Old Lyme, CT

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I thought it would be a good idea to share the things that didn't quite work out as expected during our builds and maybe discuss what the causes might have been. Also, to share any build tips that others may benefit from.

So here's my glitch:

My ARF with the recommended ACE servos installed and centered, flybar level and locked, and the radio functions in nuetral, pitches linear, etc., had a collective range of -16 to +11, centered at -5. I disassembled the head and checked the lengths of all the ball links using a digital caliper. They were spot on. It took quite a bit of adjusting of the servo links to get it centered and then I used end points to get to the +10 to -10 range. I almost ran out of threads on the elevator rod. I have no clue how it could have been off that far. Has anyone else had this happen?

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01-28-2007 02:47 PM  10 years agoPost 2
ckoelliker

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St. Simons, GA

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Just a thought: Is it possible that you have two of the rods in the wrong place. Like if you have two at 60mm and two at forty mm, you have them installed backwards the forty where the sixty needs to be. I do not have this helicopter so this is just an idea.

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01-28-2007 03:34 PM  10 years agoPost 3
Gazzer

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Hope Valley, UK

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Yep, something is wrong if you have that much of a link adjustment problem. You always need some link adjustment to get it exact but it was fairly close on mine.

<--Raptor 60--Raptor 50--Mini Titan E325-->

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01-28-2007 03:45 PM  10 years agoPost 4
dleroi123

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Old Lyme, CT

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Ckoelliker,

Thanks. I liked that idea, but I just re-checked and that isn't the case.

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01-28-2007 04:20 PM  10 years agoPost 5
dleroi123

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Old Lyme, CT

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Gazzer,

Does your manual show the same lengths as my manual?

Thanks,
Don

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01-28-2007 11:19 PM  10 years agoPost 6
ckoelliker

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St. Simons, GA

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What about two of the mixing arms on backwards?

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01-29-2007 01:45 AM  10 years agoPost 7
dleroi123

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Old Lyme, CT

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No, it isn't that, either.

I have come to the conclusion that it's the position of the main shaft in the z-axis. I think it's down too far, which would have the same effect as lengthening the servo link rods. If I loosen the main shaft's two lock rings' set screws, I can lift the main shaft just about the same amount that I shortened the links. The other thing that happens when I lift the main shaft is that the tail drive gear lines up perfectly, up and down, with the autorotation gear. Before, it was off a bit.

This was an ARF, so I didn't have the opportunity to measure the position of the top lock ring in relation to the bottom of the main shaft as directed in the manual.

Thanks for your insight on this. Checking on your suggestions is what made me realize that the linkage was set up properly. Given that, there were only a few other possibilities.

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01-29-2007 02:06 AM  10 years agoPost 8
Gazzer

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Hope Valley, UK

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Sounds like you found the problem but I measured my links anyway ..... still on the heli so difficult to be exact but here is what I found:

A = 18~19mm
B = 20mm
C = 23mm
D = 36mm
E = ~43mm

The only link that is arguably outside spec in the manual is 'E' which is stated to be 41.5mm. Using these lengths gave me something like -11 to +11 deg.

Since it's easy to do I would suggest that you take the main shaft out completely and reset it as per the manual, then your sure everything is as it's supposed to be

<--Raptor 60--Raptor 50--Mini Titan E325-->

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01-29-2007 03:23 AM  10 years agoPost 9
dleroi123

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Old Lyme, CT

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Gazzer,

I read your mind and adjusted the top lock ring per the manual. With the links back to their original lengths, I now have -11 to +11 on the collective with 0 at center stick!

Thanks for going to the trouble of measuring. And, thanks for this and past advice. This is the 3rd time you've bailed me out!

You know, I didn't actually want the ARF. At the time, I thought it was the only package that came with motor and ESC. Should have stripped it down. The upside, though, is that they did a good job of sizing the ball links - smooth as silk.

- Don

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01-29-2007 05:31 AM  10 years agoPost 10
Gazzer

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Hope Valley, UK

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Way to go .......... now fly it !!

<--Raptor 60--Raptor 50--Mini Titan E325-->

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01-30-2007 01:28 PM  10 years agoPost 11
dleroi123

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Old Lyme, CT

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I flew the shrink wrap off my stock blades yesterday! Actually, it didn't take much. Other than not using them, does anyone have any tips about how to prevent this?

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01-31-2007 03:32 AM  10 years agoPost 12
ESWLFSE

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Liberty Hill, TX

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Leave a good 3/32" of material around the carbon windscreen trim line for a good fit to the canopy and tape it on all around from the inside. This beats the screws and yields a stronger canopy.

The notch for the landing gear in the bottom of the canopy is defined too small and needs to be wider. Extend the notch toward the bottom of the canopy only for the best fit on the rear pins.

And yes, use the alignment of the tail drive gears to set the Z position of the main shaft with the collars before setting up your head.

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01-31-2007 06:20 AM  10 years agoPost 13
Nitrohuffer

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Bloomingburg,NY

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I'm stumped.

I have the same problem dleroi123 had, but my alignment of the tail drive gears is perfect. I triple checked the rod lengths and placement. With the servo horns parallel with the swash per the manual I get +16 top, +5 mid-stick, and -10 bottom. My swash afr's are all 50, everything is still centered in the radio. I even tried pulling the servo horns off and moving them a notch. Then I get +10 top, -5 mid-stick, and -16 bottom. Any ideas?

Lungs transformed to take in water.

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01-31-2007 01:41 PM  10 years agoPost 14
Gazzer

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Hope Valley, UK

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Not wanting to state the obvious but do you have the same problem. That is you have an AFR kit and the main shaft is sitting high/low on the frame. i.e. the shaft collar is in the wrong position?

As mentioned the link lengths in the manual are (approx) correct so for the difference you are currently measuring something is definately wrong (now that is stating the obvious ).

<--Raptor 60--Raptor 50--Mini Titan E325-->

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01-31-2007 02:03 PM  10 years agoPost 15
dleroi123

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Old Lyme, CT

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Nitrohuffer,

Try loosening (not removing) the setscrew on the bottom collar to see if you can then move the shaft up a bit. If so, you probably do have the same situation that I did. Incidently, getting the shaft in the right position may get your pitch symmetrical, but it doesn't explain why we have 26 degrees of travel instead of 20. I solved that by moving in a hole on the servo horns. I don't think I mentioned that before.

What servos are you using on the swash?

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01-31-2007 02:23 PM  10 years agoPost 16
dleroi123

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Old Lyme, CT

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Thunder Tiger should have hired me to find the weakest parts on this model! The postal service can't keep up with my needs, so here's my temporary solution for my latest mishap. Hand made, I'm proud to say.

Actually, I may keep this if it proves to me more durable than the original.

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01-31-2007 05:05 PM  10 years agoPost 17
Nitrohuffer

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Bloomingburg,NY

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For servo's I'm using jr ds258's. The balls are mounted .5mm in from what the manual says. That's where the holes were. I could reduce the over abondance of pitch by lowering the afr rate but then I wouldn't have enough negative. The gears are spot on. I may need to shorten the links that are connected to the servo's. I will get right tonight then post my findings. I bought the kit version and I was very careful to follow the manual to the T. That fix came out great!

Lungs transformed to take in water.

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02-02-2007 04:58 AM  10 years agoPost 18
Nitrohuffer

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Bloomingburg,NY

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Doh!

It was the hi/lo pitch with my VR sliders. Fixed.

Lungs transformed to take in water.

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02-02-2007 09:48 AM  10 years agoPost 19
Gazzer

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Hope Valley, UK

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dleroi123 looks better than the original Very cool

<--Raptor 60--Raptor 50--Mini Titan E325-->

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02-02-2007 01:25 PM  10 years agoPost 20
dleroi123

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Old Lyme, CT

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Thanks, Gazzer!

I thought I might have to cut holes in it, like the original, but I've flown it several times this way and the tail is rock solid.

I may change the way it mounts, though. I don't care for it being attached to the tail rotor housing.

- Don

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