450 Spacers

[RMB677]

I finished assembling my Trex 450 Sport V2 (tail belt driven). I had a bit of vibration when spooling up for blade tracking adjustment and after checking noted excessive play up and down with the main shaft. I installed spacers totalling 1mm (5 @ 0.2mm) before the shaft was solid. Is this an acceptable amount of spacers or is something out of spec.? I did have the shorter end of the main shaft into the gears.

Also, compared to my Blade 450 the swash movement doesn't appear to have as great a range, I used the +60% swash mix numbers recommended in Tony's video for the DX6i setup. Would increasing the swash mix settings increase the range of movement for the swash?

 

[Slobberdog]

the writing on the Align shaft should be below the collar where you cant see it, if you have it on top of the collar its in wrong.

 

[Tony]

As stated, the Align logo on teh main shaft will be where the main gear goes. I usually don't like running that many shims, but sometimes, you have to do what you have to do. 1mm is a LOT of play in that head. You can try to loosen your main blocks and spread them apart to take up some of that space, but after a while, they will push together once again. If your main shaft is installed correctly, then I would just leave those shims in there. Make sure to hit them with a very slight amount of oil to keep them from rubbing together and possibly causing interference.

 

[Tony]

Oh and as for the swash mix numbers, You need to get your pitch gauge out and check the pitch. You should have between 10º-12º of collective pitch, and 8º-10º of cyclic pitch. 60 is just a starting point and is where the Tx defaults to on a new model. You will have to make this unique to yourself and your helicopter on what feels right.

 

[RMB677]

Thanks for the replys. I did/do have the labeled end of the shaft on the down end. Another thing I note is when spooling up for blade aliegnment check I go through a point of vibration at about 25% of stick. It clears as the rpm's go up.

 

[Tony]

As long as it goes away, it's completely normal to have some vibration on spool up. Real helicopters have the same thing.