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Old Dec 06, 2012, 11:25 AM
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Yak 55: the final stretch!

I finished connecting and centering the servos/horns, and installed the motor mount into the fuselage.

Final test fit of the cowling prior to adding mount screws, and the plane looks VERY nice, if I do say so myself! Below are two shots of the plane minus wings (easier to finish electronics layout without them on the plane for now), showing the vane system and prop as it will appear when I am done.

A static motor test the other day on the RCTimer 3536-6 1250Kv, 500W motor running the MAS 11x7 3-blade prop had around 330W peak on WOT with a nominal (not fully charged) battery, running just under 37Ap. 50% ran around 130W at 11.6-11.7A. well within the capaibilities of this 3S system, and some room for tolerance on the power system (ESC is Turnigy 45A/55Ap unit, so I am safe).

The only odd thing was in order to get close to the 40 degree throws in the manual, I had to run all servos at 125% - they all work fine at that setting. No binding or warping seen so far during test throws. These HD-1810MGs from HobbyKing are very nice - plenty of torque to run this model's control surfaces!

Linkages are made with Sullivan clevices, and 2-56 threaded rods. Very secure, easy to adjust, and solid. The HD-1810MG servos have plenty of torque for this plane.

Pix below. Almost done!
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Last edited by SkyCadet; Dec 06, 2012 at 11:51 AM.
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