Fuselage torque tubes
Posted: Fri Feb 17, 2012 9:59 pm
It's awful quiet out there.
When I am stumped with something I always think of Wayne, however, I know
there is lots of you fellows with a wealth of knowledge who have answers. I
have a few questions about the fuselage control torque tubes. I did not build
the tubes (they were completed when I bought the kit) they differ somewhat
from the manual.
On the outboard end of each fuselage torque tube there is a AN4-16A bolt
screwed into the end plug and anchor nut. The bolt head is cut off so it will
insert into the end plugs on the wing torque tubes so as to keep the tubes
aligned.
These bolts with the heads cut off stick out of the tube ends 3/4" on my
plane, but the W-62-1 spacers that fit between the horns and space the
control tubes are also 3/4" wide. This means the bolts don't have sufficient
length to insert into the wing tubes.
I have no way of knowing how far into the anchor nut these bolts where
screwed in. I can remove the bolt with a vice grip and screw in another one,
then cut the head off to leave the bolt 1' long. This will allow the bolt to
insert into the wing torque tube a 1/4". Is a 1/4" sufficient overlap?
There is more that confuses me. The W-62-1 spacers are called out to be
installed with AN3-11A bolts (page 26, step 31, of the CD manual) but this
bolt length is to short too install the 3/4" wide spacers between the horns.
It requires a AN3-12A bolt to install the 3/4" wide spacers. The manual
mention the spacers may need to be sanded but does not give a specific length.
However, shortening the W-62-1 spacer, instead of lengthening the bolts with
the cut off heads, would require the fuselage control tubes to spread and
they are held together with an inaccessible bolt and fiber nut that sandwich
the hanger bracket (CC-78). So lengthening the bolt with the cut off head
seems the only option.
Another question concerning the control tubes. The AIL-26 bushings that
sandwich the CC-78 hanger bracket are called out to be bolted tight against
the hanger bracket (page 22, step 13, CD manual). One of these bushings I can
see rotate slightly when the tube is twisted. Should this bushing not rotate
at all and the control tubes rotate freely on the bushing?
Finally, the manual says the short fuselage control tube should be cut to 5
3/8" long. My tube was made 4 3/8" long. I can see that if it was 5 3/8" long
it would stick out of the left fuselage side so far as to leave no space for
the W-62-1 spacers between the horns. I checked the location of the hanger
bracket on the fuselage and it "is" mounted at the proper 4 1/8" from the
left fuselage side, just as the manual calls it to be.
So, to recap I have 4 questions really.
1. How long should the bolts be (with the heads cut off) that insert into the
wing torque tubes and is 1/4" penetration into the wing torque tube enough?
2. What length are the W-62-1 spacer between the control tube horns supposed
to be?
3. Are the AIL-26 bushings, sandwiching the hanger bracket, tightened so they
don't move or is it OK for them to rotate slightly when the control tube is
twisted?
4. Is the short fuselage torque tube supposed to be 5 3/8" long? if so I
don't see how it could fit.
Thanks for any help
Blue skies and tail winds
Bruce G 357R
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When I am stumped with something I always think of Wayne, however, I know
there is lots of you fellows with a wealth of knowledge who have answers. I
have a few questions about the fuselage control torque tubes. I did not build
the tubes (they were completed when I bought the kit) they differ somewhat
from the manual.
On the outboard end of each fuselage torque tube there is a AN4-16A bolt
screwed into the end plug and anchor nut. The bolt head is cut off so it will
insert into the end plugs on the wing torque tubes so as to keep the tubes
aligned.
These bolts with the heads cut off stick out of the tube ends 3/4" on my
plane, but the W-62-1 spacers that fit between the horns and space the
control tubes are also 3/4" wide. This means the bolts don't have sufficient
length to insert into the wing tubes.
I have no way of knowing how far into the anchor nut these bolts where
screwed in. I can remove the bolt with a vice grip and screw in another one,
then cut the head off to leave the bolt 1' long. This will allow the bolt to
insert into the wing torque tube a 1/4". Is a 1/4" sufficient overlap?
There is more that confuses me. The W-62-1 spacers are called out to be
installed with AN3-11A bolts (page 26, step 31, of the CD manual) but this
bolt length is to short too install the 3/4" wide spacers between the horns.
It requires a AN3-12A bolt to install the 3/4" wide spacers. The manual
mention the spacers may need to be sanded but does not give a specific length.
However, shortening the W-62-1 spacer, instead of lengthening the bolts with
the cut off heads, would require the fuselage control tubes to spread and
they are held together with an inaccessible bolt and fiber nut that sandwich
the hanger bracket (CC-78). So lengthening the bolt with the cut off head
seems the only option.
Another question concerning the control tubes. The AIL-26 bushings that
sandwich the CC-78 hanger bracket are called out to be bolted tight against
the hanger bracket (page 22, step 13, CD manual). One of these bushings I can
see rotate slightly when the tube is twisted. Should this bushing not rotate
at all and the control tubes rotate freely on the bushing?
Finally, the manual says the short fuselage control tube should be cut to 5
3/8" long. My tube was made 4 3/8" long. I can see that if it was 5 3/8" long
it would stick out of the left fuselage side so far as to leave no space for
the W-62-1 spacers between the horns. I checked the location of the hanger
bracket on the fuselage and it "is" mounted at the proper 4 1/8" from the
left fuselage side, just as the manual calls it to be.
So, to recap I have 4 questions really.
1. How long should the bolts be (with the heads cut off) that insert into the
wing torque tubes and is 1/4" penetration into the wing torque tube enough?
2. What length are the W-62-1 spacer between the control tube horns supposed
to be?
3. Are the AIL-26 bushings, sandwiching the hanger bracket, tightened so they
don't move or is it OK for them to rotate slightly when the control tube is
twisted?
4. Is the short fuselage torque tube supposed to be 5 3/8" long? if so I
don't see how it could fit.
Thanks for any help
Blue skies and tail winds
Bruce G 357R
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