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Monday, September 5, 2011

Pike Precision assembly

As the Pike Precision arrives with the servos installed with RDS in the wing, the assembly is limited to the installation of the elevator servos in the fuselage. The servos tray is cutted for 15mm servos, so I made another one to use with my DS6125-H. I used the same layout, that tis to say that the tray is long enough to reinforced the junction between the root and the nose. I added an hole for a switch.

once the servos tray in place, and reinforced with some fiberglass, I installed the wire looms provided. Before, I secured the soldering with some hot glue, as I usually do. The green plugs are then just glued with cyano in place.

Once the servos in place, I cutted the elevator rods at the exact length, then glued + pinched the M2 Treaded couplers to receive the metal clevises. I found one of the rod to be a bit long without guide, but hopefully, if didn't create any slop at the elevator side. I will improve this after the first flights.

The battery is made from 4 x AA POWER XX Eneloop cells, which gives 2500 mAh. This is the new eneloop generation. They should give me more flying time. They are soldered in a 2+2 configuration. The receiver is the duplex R8 from Jeti. I found a nice way to position the antenna at 90°: I use a piece of coroplast which is double taped on the receiver.

I needed around 80g of lead to do the balance at 102 mm.

When I switched on the plane to program it on my T12, I had the bad surprise to not be able to align the trailing edge of the flaps correctly. After investigating, I discoverd that my R8 Jeti receiver has a servo signal output between 1ms and 2ms, with the neutral position at 1.5ms.

According to Samba I should be able to obtain 5mm up and a lot down, using the neutral position shifting on the transmitter. To achieve it, I used the great feature of Jeti which allows you to program the receiver thanks to the Jetibox. You can, per channel, change the min and max signal output, and the neutral position.

I configured the maximum at 2.2 ms and the minimum at 0.8 ms, letting the neutral position at 1.5 ms. Like this, I retrieve the full travel that Samba promised me :) !

Despite MKS 6125 mini has less travel than other servos, I obtain the travel up and donw, as desired which is great.

Weight per component is as following:

  • Joiner: 113g
  • Right tail: 38g
  • Left Tail: 39 g
  • Right wing: 640g
  • Left Wing: 642g
  • Fuselage: 643g
Total: 2115g

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