CB model designs CBMD-002 Bouwhandleiding - Pagina 8

Blader online of download pdf Bouwhandleiding voor {categorie_naam} CB model designs CBMD-002. CB model designs CBMD-002 13 pagina's.

Position the stab platform assembly in place, making sure it is centered on the fuselage, and

square to the fuselage center line when viewed from above. Also check to make sure it is sitting

horizontally on the fuselage. It is optional to build in the stab tilt for a right hand glide pattern at this

point if desired. Our recommendation is to build the model square to start in case warps or other

imperfections preclude the stab tilt as shown. When satisfied with fit and position, bond in place.

The filler area on the stab platform can now be trimmed slightly to match the taper of the upper

longerons. Use a razor blade to carefully slice off the small taper required to carry this contour to a

feather edge, on either side of the fuselage. Using a small sanding block, finish the top of the filler

to blend into the top of the fuselage. Check the fit of the stabilizer to the stab platform installation.

The sides of the S-2 ribs should clear with a minimum gap, allowing the stabilizer to tilt up easily

from the flying position. Mark where the stabilizer trailing edge crosses the tail filler block with the

stabilizer in place against the stab platform filler. Measure forward 3/32" from this line, and

establish the center for the incidence adjustment screw location. This should be approximately

centered on the stab trailing edge. Use a sharpened wire or similar to create a center starting hole

for the screw pilot hole. Drill a 1/16 dia pilot hole square to the fuselage all the way through the tail

filler block. Thread the screw into this hole completely; remove for covering the fuselage. Cutoff

any excess screw length with the screw completed turned down to the surface of the basswood

filler to prevent damage to the D/T guide tube joint. This completes the basic fuselage assembly.

Build up the noseblock assembly next. Start by installing the 1/32 plywood noseblock doubler over

the 5/32 diameter aluminum thrust bearing tube, which will be used as a pin to stack the

laminations for bonding. Position segment 'A' against the doubler with tube through the pilot hole,

and bond together with thin CA. Make a mark on the upper edge of segment A for reference to the

top of the block. Now install the remaining segments using the tube as a guide and best fitting to

the laser etched outline of the previously installed segment, bonding with thin CA. Install segment

'G' with the corner notched. The corner piece itself is to be installed into the mating fuselage corner

to allow keying of the noseblock assembly into the fuselage opening.

Mark the fuselage front end for the right thrust angle. Use a fine ballpoint or pencil to layout an

angle on the top surface of F-2. The angle should start at the left forward longeron corner and

taper to a point 1/32 aft of the right corner of the upper longeron. From this point, draw this line

parallel to the edge of F-1 on the right side of the fuselage front edge, and then repeat the tapered

line from the lower right hand corner to intersect at the forward lower left hand longeron point. Use

a sanding block to carefully sand to the lines, making the entire face a planar surface that the

noseblock will seat against.

Install one of the plastic thrust bearings into the front of the tube to use as a reference when

sanding the noseblock contours. Install the noseblock assembly into the fuselage and hold in place

with masking tape on the upper and lower sides. Use a sanding block and blend the sides of the

noseblock flush and into the sides of the fuselage. Be careful not to remove too much of the

longerons in this process. Sand the surface until all the steps in the segments are flush. Blend the

plywood doubler to the edge of the thrust bearing. Repeat the process for the opposite side.

Now tape the noseblock in place with tape applied to the smoothly shaped sides, and remove the

upper and lower tape, sanding the contour of the segments until smooth. Blend the plywood

doubler to be flush to the thrust bearing. The block should now be profiled smooth on four sides,

with sharp intersecting corners. Blend the corners just aft of the thrust bearing to continue the

blending of the plywood doubler to match the thrust bearing, allowing the corners to still be slightly

sharp at the aft edges of the noseblock common to the longerons. Avoid heavy radiusing through