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Ch09 - Main Landing Gear and Landing Brake
I will build
my own retracts main landing gear. I made extensive researches and a lot of
drawings. The next few days will be exciting.
In the second
image the first drawing is the thickness profile. It`s fit very nice in the
strakes. I don`t copied any other gear legs, I developed my own profile.
The second
one is the displacement to FS 110, there are alignment
tiny circles to glue the A4 paper size. The 9 rectangles support`s the fiberglass mold.
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08/10/2008 Some drawings of the retract gear leg.. After I have printed in A4 size paper
and glued then in a 2.5mm MDF. There`s one nail in the center of the
shaft just to check the position on the fuselage. Sounds good. 2 Matco
wheel`s triple piston brakes to check the heigth
inside the strakes and the width/thickness of the final portion of the leg. All is very empiric knowledge and trying
fit`s. |
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24/10/2008 Steel shaft 3/4" 4130 length
6". Some grooves to better junction with roving, flox
and shaft. |
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Grooves are in two directions. After
fixed in place the shaft will receive the uni
roving around. |
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Roving of 2400 tex
E-glass. The legs don`t need to be made of S-glass, that`s just superstition.
Take a look in the link below, is one brazilian
builder that build there own leg and tested with a
2200lbs weigth. http://www.youtube.com/watch?v=V2nHbwoK0Gk |
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Bundles ready to go. |
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Tools to punch the uni inside the mold. |
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26/10/2008 Template to make the thickness of the
leg fixed in the foam block. Now comes the hot wire. That one makes the contour of the leg to
get a perfect fit inside the strakes. |
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Width template fixed
in the foam. |
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The width template makes the
displacement of the wheel axels to the FS 110. |
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Leg ready to receive polyurethane finish
paste and contour to build the female mold. |
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One more shot. |
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And other. |
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01/11/20008 Finishing the legs plug to make the
mold. |
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I used polyurethane
paste to contour the foam. And after sealed with polyvinylic
alcohol. |
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04/11/2008 Mold ready and fixed inside the
supports. |
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Another view. |
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Center shaft in place.
The roving will cross by the sides and around the shaft. |
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07/11/2008 Today I laminated the test leg. Whith this one I will make some destructive
tests. |
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6 hours to make the
leg. I used the 220minutes pot life hardenner. |
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08/11/2008 Leg looks good. I am very impressed. I
think the gaps was filled with epoxy and flox, and is not a real problem. I think if I use the 2200tex roving
instead the 2400tex, I can make the work more accurate. |
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Leg weight`s
15 lbs. |
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Cooooolllll! |
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02/01/2009 Here I removed the landing brake with
one stileto. Sanded the depression in 1/8". I am building the landing brake with my
carbon/aramide hinge. The hinge is floxed
in place. I don`t have the plywood or hardware, nor the aluminum hinge. Is
just carbon/aramide hinge with a lot of flox. I am making a movie. When I finish the
landing brake I will post on youtube. |
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LB of 2plies carbon, made in vacuum. The 2 brackets supports are made of
carbon and aramide. After ready they were floxed in place and 1 ply of carbon aplied. Look the hinge. In the movie you will
see how I made the hinge and the LB. I must do one layup of 2 plies of glass
around the hinge. Crossing to one side by the other side. Like that my LB is
strong enuff to hold the pressure. I think more 3 days of work here. |
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05/01/2009 The actuator is one 4" stroke of
110lbs by Spal. The plywood base mounting will be fixed
on the seat back. I floxed one 0.063" aluminum
tab with tree riveted MK-1003 betwen 2 plywoods. The actuator support
have 12 plies each arm and base. Weights: Actuator with hardware, 2.60lbs Base mounting, 0.14lbs Actuator support, 0.12lbs Complete LB with ancors
and hinge, 1.69lbs Floxed Hinge, 0.09lbs SS pin of 0.059", 0.04lbs Aprox.
epoxy-flox, 0.26lbs Total,
4.94lbs |
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07/01/2009 Base mounting fixed in place with 6
plies of glass. |
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Actuator mounted aft
of the seat back. |
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