Mini Titan feels tight...

[Jonathan Ott]

Hi guys,

I was working on my newly acquired (used) Mini Titan last night and I noticed that when spinning the blades by hand, they seemed really tight. Like if I ever decided to hit throttle hold and do an auto, the headspeed will degrade within seconds resulting in a freefall.

I pulled the boom loose to disengage it from the main gear, and it spun a lot easier, so I figured the one way bearing did not have any locktite or any other adheasive in it (on another note, if I ever have to replace the mainshaft or a gear, it is going to be a b!tch 'cause the previous owner did not use locktite...he used CA glue :roll:). My conclusion is the T/R belt is too tight, but it has the minimum of 5mm free play noted in the manual.

Since it is a "driven tail", should it feel so tight? Will blade inertia keep things going well enough when autorotations make it into my training?

Thanks!

Jon

[BarracudaHockey]

The 450 size helis in general auto rotate like a homesick lawn dart.

[henrik04]

Hi guys,

I was working on my newly acquired (used) Mini Titan last night and I noticed that when spinning the blades by hand, they seemed really tight. Like if I ever decided to hit throttle hold and do an auto, the headspeed will degrade within seconds resulting in a freefall.

I pulled the boom loose to disengage it from the main gear, and it spun a lot easier, so I figured the one way bearing did not have any locktite or any other adheasive in it (on another note, if I ever have to replace the mainshaft or a gear, it is going to be a b!tch 'cause the previous owner did not use locktite...he used CA glue :roll:). My conclusion is the T/R belt is too tight, but it has the minimum of 5mm free play noted in the manual.

Since it is a "driven tail", should it feel so tight? Will blade inertia keep things going well enough when autorotations make it into my training?

Thanks!

Jon

As I did learn on this heli, I had many crashes with it.

I have numerous one way bearing and the one way shaft which is named PV0726 is probably the cause of the tight feeling you are describing if your main shaft is not bent.

Assuming that you place the a washer on each side of the auto rotation gear PV0722 with a good amount of ceramic grease it should be very smooth.

Say if you give by hand a good motion on the rotor and blades, it should turn without stopping a good two to two and a half turns.

If not the one way shaft is probably not round no more. After a crash, the screw going through the PV0726 deforms it. Not by much but enough to make it very tight.

Ohh and another thing: I just assumed that you replaced the plastic frame bearing bloc with this one:
http://www.infinity-hobby.com/main/product_info.php?cPath=32_102&products_id=1597

I just tried to blow on the end of the blade and it makes it turn.. As I am a smoker and no superman that should give you a good idea of how smooth the thing should be for your auto to work.

Hope this help.

Happy flying.

[Jonathan Ott]

Thanks for the thoughts on this. Since I bought it used, and assembled, and the bottom retainer seems to be welded on it'll be a while before I get the shaft(s) out to check for true. I'm an advanced beginner heli pilot, so I wanna get hovering and FF down before I start auto'ing and thrashing it around.

I cheked the site you linked me to, and parts have great prices there, no doubt!

I'll get around to upgrades, I just figured that it souldn't be as tight as it feels, but it may not be as tight as I think it is. I've not hand spun it up too quick with blades on, mostly just blades off (paddles only).

I'll give it a 'whirl' again soon, and get to the bottom of this.

Thanks again!

Jon

[tailStrike]

The 450 size helis in general auto rotate like a homesick lawn dart.
:rolling:lolol.

I don't really plan to learn autorotations on my MT as I have a good idea what will happen w/ as little mass as there is in these little heads, but mine spins fairly freely. I get about 3 1/2 to 4 rotations if I give it a twist and let go.

[hazy]

Try to lossen the nut that bot the autorotation gear to the main gear.It should help

[Jonathan Ott]

I finally got the bottom retaining collar off today, pulled the main shaft and checked the one way bearing and shaft. Cleaned lots of gunk out and put it all back together and it all spins freely now. The origional builder used too much of something to hold it all in solid and gummed it all up a bit.

Thanks for all your suggestions,

Jon