Our
carbon bellcranks are molded with high-temp epoxy and continuous carbon
tow. The weight of these bellcranks are between 7 and 8 grams each
without the leadouts and pivot post. The installed weight will
depend on how long the pivot post is and the type of leadout material
used. The leadout holes are bushed with 3/32 inch ID brass and the
pivot post is 1/8 inch music wire. The pivot bushing is oil
impregnated bronze to provide a smooth long lasting bearing surface
without any wobble to last thousands of flights. The pushrod
bushing is machined to tight tolerances from phosphor bronze to provide a
slop free fit with 3/32 inch music wire. If a Rocket City ball link
is used the pushrod bushing can be tapped to accept the 4-40 bolt. If this
method is used a 4-40 lock nut will need to be added to the 4-40 bolt. The
bellcrank is positioned on the pivot post by two retainers. The
large retainer supports the bellcrank from the bottom while the small
retainer is at the top. The best way to install the retainers on the
pivot post is to use JB weld epoxy. When solder and flux is used
there is the chance of contaminating the bearing and pivot post with flux.
If the flux is not neutralized it will cause the music wire to rust.
JB Weld is a high temp aluminum filled epoxy that adheres well to
steel. The low weight and tight tolerances of this part make it a
natural for today's modern aerobatic aircraft.
This
is the same bellcrank except that the 19 strand 1/32 inch diameter
stainless steel leadouts are attached. The breaking strength of
these cables are 185 pounds. Since there are two leadouts the
breaking strength will double to 370 pounds. The leadouts run through
a brass tube to provide a smooth bearing surface. Whenever cable
leadouts are used it is important that they are bushed to prevent them
from sawing through the bellcrank material. The crimping ferrules
will withstand the full breaking strength of the cable. This cable
is extremely smooth and flexible and will provide thousands of flights.
This
close-up of the bellcrank assembly shows the positioning of the retainer
bushings with the small turned bushing on the top and the large flange
bushing supporting the bellcrank from the bottom. These retainer
bushings are a tight slip fit to allow them to be positioned during
assembly. The best way to install the retainers on the pivot post is
to use JB Weld epoxy. When solder and flux is used there is the
chance of contaminating the bearing and pivot post with flux and a risk of
corrosion or rust exists. JB Weld is a high temp aluminum
filled epoxy that adheres well to steel. Remember to clean the area
where the epoxy is to be applied with 320 grit sandpaper.
Our
carbon bellcranks are molded with high-temp epoxy and continuous carbon
tow. The weight of these bellcranks are between 7 and 8 grams each
without the leadouts and pivot post. The installed weight will
depend on how long the pivot post is and the type of leadout material
used. The leadout holes are bushed with 3/32 inch ID brass and the
pivot post is 1/8 inch music wire. The pivot bushing is oil
impregnated bronze to provide a smooth long lasting bearing surface
without any wobble to last thousands of flights. The pushrod
bushing is machined to tight tolerances from phosphor bronze to provide a
slop free fit with 3/32 inch music wire. If a Rocket City ball link
is used the pushrod bushing can be tapped to accept the 4-40 bolt. If this
method is used a 4-40 lock nut will need to be added to the 4-40 bolt. The
bellcrank is positioned on the pivot post by two retainers. The
large retainer supports the bellcrank from the bottom while the small
retainer is at the top. The best way to install the retainers on the
pivot post is to use JB weld epoxy. When solder and flux is used
there is the chance of contaminating the bearing and pivot post with flux.
If the flux is not neutralized it will cause the music wire to rust.
JB Weld is a high temp aluminum filled epoxy that adheres well to
steel. The low weight and tight tolerances of this part make it a
natural for today's modern aerobatic aircraft.
This
is the same bellcrank except that the 19 strand 1/32 inch diameter
stainless steel leadouts are attached. The breaking strength of
these cables are 185 pounds. Since there are two leadouts the
breaking strength will double to 370 pounds. The leadouts run through
a brass tube to provide a smooth bearing surface. Whenever cable
leadouts are used it is important that they are bushed to prevent them
from sawing through the bellcrank material. The crimping ferrules
will withstand the full breaking strength of the cable. This cable
is extremely smooth and flexible and will provide thousands of flights.
This
close-up of the bellcrank assembly shows the positioning of the retainer
bushings with the small turned bushing on the top and the large flange
bushing supporting the bellcrank from the bottom. These retainer
bushings are a tight slip fit to allow them to be positioned during
assembly. The best way to install the retainers on the pivot post is
to use JB Weld epoxy. When solder and flux is used there is the
chance of contaminating the bearing and pivot post with flux and a risk of
corrosion or rust exists. JB Weld is a high temp aluminum
filled epoxy that adheres well to steel. Remember to clean the area
where the epoxy is to be applied with 320 grit sandpaper.
