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dean.psiropoulos(at)veriz
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 Posted: Sat Jun 14, 2008 10:47 pm Post subject: RV-6 Bellcranks. |
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Two questions for the RV-6/A builders.
Aileron bellcrank ends where the heim bearings are installed. Do I need a
spacer washer on either side of the heim bearing (between the bellcrank
ears) in order to provide enough movement to get full forward and aft stick
travel? Right now my control sticks don't seem be able to move fore and aft
as far they should and I can't seem to be able to find the cause.
Elevator bellcrank spacers...... I originally made them both the same length
but when I was checking the blueprints the other day I noticed it shows one
spacer 15/16 inch and the other 7/16 inch. So I made new ones but when I
put the offset spacers in I noticed that the now offset bellcrank end did
not meet up with the pushrod coming from the control stick assembly (the
hole in the bottom of the bulkhead was centered and if I use the offset
spacers I'll have to grind out this hole and take out a good bit of the
flange (and a couple rivets) of the horizontal rib that runs between the
bottom of the aft baggage bulkhead and the next bulkhead aft, I'm a little
worried about loss of strength of the assembly by doing this). I also had a
fellow RV-7 builder look up these spacers on his plans and low and behold,
the spacers are equal length. So.....is there any reason I have to offset
the bellcrank or have some of you RV-6 builders used the equal length
spacers? Thanks.
Dean Psiropoulos
RV-6A N197DM
A couple weeks from first flight
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shirleyh
Joined: 05 Jun 2006
Posts: 15
Location: Perth, Western Australia
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| Posted: Sun Jun 15, 2008 3:31 am Post subject: RV-6 Bellcranks. |
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Dean - we had the same problem with the elevator bellcrank spacers - very
frustrating. Went with gut feeling and installed the equal sized ones and
have had no problems in 2 years.
Sorry, can't remember about the aileron bellcrank spacers right now.
Shirley Harding
RV6
80 hrs
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Dale Ensing
Joined: 11 Jan 2006
Posts: 571
Location: Aero Plantation Weddington NC
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| Posted: Sun Jun 15, 2008 4:03 am Post subject: RV-6 Bellcranks. |
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Dean,
First, check to see if the heim bearings on both ends of the aileron tubes
are in alignment. i.e. When the tube rotation is at max (in either
direction) because of the heim bearing, is the heim bearing on the other end
also at max rotation in that direction? They need to be the same or else you
are giving up some of the rotational play of the tube that heim bearing are
there to provide.
Second, the fore and aft stick movement should be limited only by the
elevator stops.
I do not remember removing any of the flange of the fore/aft rib between the
aft baggage bulkhead and the next aft bulkhead. I would use whatever spacers
to give the free movement of the push/pull elevator tube versus removing
material from the bulkhead.
Dale Ensing
RV-6A N118DE
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_________________
Dale Ensing
RV-6A
Aero Plantation
Weddington NC |
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jfogarty(at)tds.net
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| Posted: Mon Jun 16, 2008 7:07 am Post subject: RV-6 Bellcranks. |
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Dean, The shaft connecting the two control sticks maybe hitting on the top
portion of the rib web. I had that problem with my RV9, and I needed to do
some of filing in order to get full movement on the elevator control stick.
Hope this helps.
Jim
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gyoung
Joined: 09 Jan 2006
Posts: 211
Location: Republic of Texas
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| Posted: Mon Jun 16, 2008 8:14 am Post subject: RV-6 Bellcranks. |
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The elevator bellcrank spacers need to be adjusted so the lower pushrod goes
thru the hole in the bulkhead without interference through the whole range
of motion AND the upper pushrod does not contact the vertical support when
the stick is full forward. I think the asymmetry was because of the upper
pushrod and that cone adapter needing to clear the center support. Whatever
combination of spacers/washers gets you the clearance for both is all you
need. The -6 is also subject to builder variation which has been engineered
out of the -7. Sounds like you got it just right.
Regards,
Greg Young
[quote] --
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