PineBaron
Posts: 217
Joined: 2/20/2002
From: Marlton, NJ, USA
Status: offline
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I flew my ZEN90 for the first time yesterday with a YS120, a wrap arond header from central hobbies and a Hatori Pipe, its awesome. There was no problem with balancing the CG, spot on with the battery mounted just ahead of the elevator servo. My setup is different as you can see with a heavy engine up front; I also installed an 18ox fuel tank, it was one that came with my H9 Edge540 where I installed a 24oz tank in the Edge.
Now the second problem about noseover on the ground. Yes I had the same problem as furloughed ual, however after stupidly adding an oz of weight in the tail did not help as in the air I required down trim, my good friend Eric Henderson the YS expert came to my rescue with a great idea; it was so simple that I just did not think of it just that moment even though I have the same solution in my ZEN50 (YS63). To cut a long story short: there are three things required.
1. Remove all four screws off the retract. Place a 1/16 - 1/8 plate or washers under the rearward mounting holes of the retract. I just used a couple of 1/16 washers at the field; this evening I am going to cut a plate out to increase the forward tilt. The plate will be brass or the stuff they sell in the LHS; cut it wide enough to fit under the rear mounting screws, drill two holes of the correct size for the screws to pass through. Make sure this step is done before the next step.
2. Remove the incredible amount of toe in the struts(I am still on the original retract (after just one day of flying), though I have a pair of D&B's ready for it). I did this at the field so you will need a tight grip on the coil portion of the strut first, bend the axle portion (with the wheel removed) as straight as possible; do this slowly as you do not want to break the strut. Make sure both the left and right are the same. I used a jaw grip to hold the coil and used a strong pair of large pliers to bend the axle. If you are not sure you can do this with the retracts in the plane, I suggest you remove the retracts and hold the coil in a vice.
3. Install the washers, plate and screws and also the wheels. With the wheels retracted you will notice there is some gap between the wheels and the front of the wheel well. You want to bend the struts just enough to permit easy movement of the struts using the servo. Do one wheel at a time. Test this with your rx switched on and use the retract sw up and down. If you have bent them too much the wheel will stick, bend the strut back just a bit or if there was still some gap, bend it forward just a bit. Do both wheels till they are perfect.
Well, the quick fix (it took me about 20mins at the field) made my life easier with decent ground handling. After I increase the tilt this evening I expect more improvement.
Other options are to use DB restracts, Dave Browns do not fit there; or Spring Air (they are expensive).
Let me know how you progress.
Vim
< Message edited by PineBaron -- May 6 2002 11:54PM >
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