Dual Elevator Servos

[Morton]

  Keith,

I have been very happy with 2 digital programmable MCV2 micro servos 
mounted on their sides inside the stab of my Viper 202. I originally had 
the MCV2 superflat (11 mm) servos which worked fine, but I  liked the 
quicker speed and power of the micros, and they were still only about 1 
oz each. I like the short positive nearly frictionless connection to 
each elevator half (MK ball bearing clevis). They have held up very well 
and I had no problem matching the throws. I didn't even use the 
programming feature, I just plugged each servo into a different channel 
and mechanically matched them as close as possible. One possible 
advantage could be that you could have each servo work independently 
with ailerons if you wanted to. I do that on my fun fly plane and it 
works great (I am thinking for a multi-purpose AA plane).
I mount the servos on their sides to a light ply and balsa sandwiched 
rectangular plate. I use the outer balsa layer to exactly match the 
curve of the airfoil. I then cut a hollow plywood rectangle that will 
support the servo in the stab. The width of the plywood rectangle 
(donut)  is such that 1/2 will be under the balsa stab sheeting and 1/2 
is used to support the servo plate, the center is cut out for the servo. 
I then use a router to create a box for the servo and mounting plate 
into the foam core before sheeting in the stab. Glue in the plywood 
rectangle and sheet the stab normally. I then drill a hole in each 
corner to attach the servo plate. I later added an access hatch  in the 
bottom of the fuselage to help fish the servo wires and extensions. Send 
me a message and I will e-mail pictures if you like.

Ray Morton

Keith Black wrote:

>putting servos in the stab halves
>    
>

This is exactly what I had initially considered on my Aries so my removable
stab would be easier to remove. Essentially they would be like small main
wings.

However all the feedback that I received seemed to indicate that this was a
bad idea due to extra weight, possible differences in throw over time, etc.

I'd like to hear pros and cons from others that use used this technique.

Thanks,
Keith

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20030321/2df0af3a/attachment.html