Plans link
Amos kit from BPhobbies
sheets of foam (6mm for full size, 3mm for 75%)
control horns
cheap servos
cheap 72 mhz receiver
motor and Esc (650g thrust 10X4.7 prop and 10.4 amps)
prop saver
3s 1000 mah lipo
5mm CF tube
10 amp esc (for 75% builds)
another 10 amp esc
19gr motor for 75%
5gr servos for 75%
charger1
charger2
charger3
12V power supply for above chargers
battery connectors
motor connectors
Lit up 3D version
I also made a 3D version, body is all 3mm, wings 2 layers of 3mm with a 6mm CF spar in the middle, horizontal stab 2 3mm layers with led's between, all control surfaces are 6mm. Post on rcgroups here. Some measurements on it:34" wing span
30" 6mm CF tube wing spar
32" nose to the end of the rudder
3.5" body at the widest part
Widest part about 4" back from nose tip
5.75" wing leading edge to aileron hinge line at the body
3.25" wing leading edge to aileron hinge line at wing tip
2.75" leading edge of wing to wing spar (measuring at the body)
25.5" length of center section (top and bottom front edge to rear point)
my CG is right on the spar (could be a bit back further for hovering)
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75% Amos (mini)
I made a Mini version that is 75% from full size, span is 24.5" length is 22". I made the body from 6mm, and the wings and horizontal stab out of 3mm. I exaggerated the wings just a little, in both width and length. I used a 2s 720 lipo, the above 19 gram motor, 10 amp esc, 3 X 5gr servos and a cheap 72 mhz receiver. The above 19 gr motor has about 240 grams of thrust with a 5X4.3 pulling 8 amps, and 225 grams of thrust with a 5X3 prop, pulling 6.4 amps. I use either one. This is one of my favorites, as it is a convenient size and can handle some wind.The mini was flying well, but would not hold knife edge well, it wanted to fall to the canopy, and if I corrected with aileron, it would still pull toward the canopy, requiring correction with the elevator. The issue was that the center of gravity was too high. I changed the way the battery was attached, by cutting a hole in the body so that I could lay the battery on the wing. Now it holds knife edge with very little input.
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75% Soma bipe
I made a 75% soma bipe (bi plane made from the amos), plans can be found in the above plans link. Here is a post on RCGroups about it. I did not end up liking this one as much, not exactly sure why it did not seem to fly right, but I may try it again.|
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