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View Full Version : 500SE V2 3D Head Upgrade - Head assembly and configuration questions


Rototerrier
01-21-2008, 08:08 AM
I just installed the v2 components for the 3D upgrade and got in several flights over the weekend. Totally different bird. The thing is amazing. Crisp flips and rolls.

My problem:

The 4pc kit came with shortened mixing arms. They bind up with the washout lever arms. I tried all 3 holes and found that the middle hole on the shaft is the best position, but still binds. I wound up going back to the original mixing arms (long) and fiddled for a couple hours trying to get the most +/- collective possible. I settled on 10+/8-. Also, when I do a really quick roll, I get binding on the aileron. It is minor on the bench, but in the air, you can really hear it load up on the motor.

Is there a drawing or image somewhere of the new v2 head so that I might compare what I have done? I am not completely sure I have it the way it was intended. But, it does fly a million times better than it did, I would just like to be able to get 10+/10- on the pitch. I notice that comming out of my roll, the inverted side, is much slower because of the 2 degree difference. Not a huge deal.

I spent hours saturday shortening and lengthening rods to find an acceptable mixture of pitch and cyclic. It is weird, it's a give and take. More collective seems to take away from cyclic and vice versa. Nothing binds at center (0 collective) but as you move up or down on the collective, you start to lose you maximums on cyclic...so I to keep it in my mind, when in the air, if I am really on the collective, be just a little lighter on the cyclic. But the heli is still rockin, I want to be perfectly clear that it isn't horrible.

The best way to describe this situation is that comming out of a maneuver is not a crisp as going into it because you are typically having to add collective which is then reducing your cyclic. So it starts a loop snappy and then just sorta lumbers out the other side.

Which, is a huge improvement over the V1 head where it lumbered into a flip and fell out the other side like a lead brick.

Anyone have any advice or suggestions? Thanks!!

Also, that new tail pully fixed my slow tail creep. The tail rocks!!!! If you haven't already upgraded that little jewel, do it now.

Rototerrier
01-22-2008, 01:10 PM
Anyone? Has anyone upgraded to the 3D head?

Ecaf
01-22-2008, 03:45 PM
Dan,

Im waiting on a few more parts before I redo my head. When I get them I will install and see what I get.

Oh, and the tail pulley is great!

Ecaf
01-25-2008, 01:39 PM
Dan,

Last night I was able to successfully get +/- 10 degrees collective and 8 degrees cyclic with the taller head, and shortened CNC mixing arms. I still have the plastic washout base and arms and I am using the bottom hole on the shaft. I dont see any binding but I do have some CCPM interaction at high and low pitch. I havent flown it yet so I can see what issues may be happening from a binding setup, but on the bench there is no servo buzzing anywhere throughout the full travel.

I also added a Trex 500 flybar and paddles. Although I just did a test hover, its significantly faster than before. I can measure my links tonight and give you the distances if you want.

Any pics showing where its binding? I can take the same and we can see where the differences are.

TB

Rototerrier
01-25-2008, 07:20 PM
I demolished mine this afternoon. I had been doing some flips and rolls and transitioned backed to normal flight. I have the DX7 which has 3 toggle positions...I didn't get it fully flipped to my idel up position and didn't realize. Went back for more flips and killed the throttle inverted. Thing dropped like a rock on its head.

I have a load of parts on order, probably will be mid week before they get here and next weekend before I get humpty back together again.

But, this was the 3rd rebuild on the head since I started this thread. I have been trying every shaft position and both long and short mixing arms. It seems I got my very best results from the last hole using the longer arms. I switched back to the shorter arms and tried the middle and top hole and it got worse as I moved up the shaft. I will try the short arms one more time when I start rebuilding it and see what happens.