|Jul 23, 2011, 02:46 AM|
Alpha Jet 64mm
This is my short lived Dassault Alpha Jet.
Very easy to assemble: no more than 2 hours. No glue included so I used 15min epoxy for wings and tail surfaces and UHU-por for the rest.
Plenty of space to move the battery back and forht to ensure a proper CG. But the strap installed is too big and cannot secure the battery.
The CG is ok as per manual. Is difficult to identify but if you take as reference the "dog teeth" on the wings, the CG is in line with them.
I used 2200 mAh 4s batteries: nano-tech and normal Turnigy, 35C and 40C. In average I got 3min of flying time with them.
The plane is quite fast, very stable, the manouvers are relaxed, the roll rate is ok, not very fast but straight.
I flew with and without wind and no issues here.
The EDF is well balanced and powerful enough for some vertical climbing.
Landing is a horse of another colour. The sink rate is high, so you need to keep some power (~25pcnt) until she touches the ground before killing the motor.
The weak point is the odd LG placement and securing method.
On my second landing, the plastic attachment was un-glued.
The LG wire is quite weak and flimsy. Consider changing it.
I used rubber bands to link both legs together. Later I will put a fishing line to ensure the LG is not wobbling.
It even includes an external UBEC (Bravo HK!) to manage so many servo .
After 9 flights The plane on a crashed due to a wing detached in flight.
I was glued with a lot of epoxy. But it seems that the EPO don't like this glue.
Here is the video. You can see the wing falling after the plane crashes.
|Aug 29, 2011, 06:44 PM|
Alpha jet repair
Since all the electronics were ok I decide to give her another chance and rebuilt her using mostly hot glue to avoid Epoxy, that is not compatible with type of foam. (In other EPO planes I had no issues, but on this one the Epoxy peels off like white glue)
After 2 sticks of glue I got the results in the pics.
Not elegant, but at least practical. I love EPO!
To ensure the wings attachment I added a CF rod connecting both halves. I glue them with CA and contact cement.
I fixed the LG flimsyness with hot glue also.
I will re-maiden her soon.
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