[rebel-builders] trimming of rudder/elevator horns

[Ken]

Everyone I've talked to with a Lycoming or similar engine would seem to
be quite happy with 15* down elevator. That is all I have now after
adjusting for maximum up travel. OTOH I'd probably stick with the
factory recommendations with a light rotax or tail heavy airplane unless
a few guys with that situation can confirm stall recovery performance.

I would not be brave enough to file the TS-1. It already seems on the
light side to me considering it holds the stabilizer on and takes a
beating from the tailwheel spring. Never heard of one breaking though. I
did file a tiny bit of my rudder control horn (less than 5%) but don't
know if anyone can answer that question. I can say that I use every bit
of my rudder travel and would not want to give up any of it. The rudder
horn gets stressed pretty good when stomping on the brakes or in tight
turns on soft ground and I believe there is a report or two of it
breaking in that situation.

Mike - My tailwheel springs were on the same bolts as the rudder cable.
I think most Rebels are the same in order to get maximum steering and
swivel release.

Ken

schaumr@dcsol.com wrote:

Hello Everyone,

While installing my right elevator, and checking for 25 degrees down (up is no
issue) as per the manual, the elevator horn is making contact with the
stabilizer spar, and limits movement to only 15 degrees down. Before filing
anything off, I thought I'd ask if anyone else has run into this, since I'm not
even sure one actually needs more than 15 degrees down.....

I have a similar situation with the rudder, in that the horn itself was installed
somewhat asymmetrically. As a result, one side hits the 'stop' bolt as per
plans, the other contacts the TS001 fitting (the way it used to be, I believe,
before the stop bolts were introduced). I was going to follow others and add
the "L-angle stop" under the stop bolt, but again, I am doublechecking that
the option of filing down the horn to clear the TS001 is truly off the table.

Thanks in advance...hope everyone is enjoying the break.
I'm at the inlaws in Montreal until new year's day. Ugh :(
....I'd rather be building.

....anyone got a project in the Montreal area I can visit/talk shop with? Jean
Poirier is already flying isn't he?

Rob
Rebel 786
Old Saybrook, CT

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[schaumr]

Ken (All),

Agree I wouldn't touch the TS-001..really just meant filing the horn(s). Your
comment regarding the stresses the rudder horn gets on the ground was
precisely the reason I was reluctant to file that, but it appears less than 5%
seems ot be O.K. (at least in Ken's case), but I will likely need more.

Rob





On 12/27/2010 4:55 AM, klehman@albedo.net wrote to rebel-builders:

-> Everyone I've talked to with a Lycoming or similar engine would seem to
-> be quite happy with 15* down elevator. That is all I have now after
-> adjusting for maximum up travel. OTOH I'd probably stick with the
-> factory recommendations with a light rotax or tail heavy airplane unless
-> a few guys with that situation can confirm stall recovery performance.
->
-> I would not be brave enough to file the TS-1. It already seems on the
-> light side to me considering it holds the stabilizer on and takes a
-> beating from the tailwheel spring. Never heard of one breaking though. I
-> did file a tiny bit of my rudder control horn (less than 5%) but don't
-> know if anyone can answer that question. I can say that I use every bit
-> of my rudder travel and would not want to give up any of it. The rudder
-> horn gets stressed pretty good when stomping on the brakes or in tight
-> turns on soft ground and I believe there is a report or two of it
-> breaking in that situation.
->
-> Mike - My tailwheel springs were on the same bolts as the rudder cable.
-> I think most Rebels are the same in order to get maximum steering and
-> swivel release.
->
-> Ken
->
-> schaumr@dcsol.com wrote:
-> > Hello Everyone,
-> >
-> > While installing my right elevator, and checking for 25 degrees down (up
is no
-> > issue) as per the manual, the elevator horn is making contact with the
-> > stabilizer spar, and limits movement to only 15 degrees down. Before
filing
-> > anything off, I thought I'd ask if anyone else has run into this, since I'm
not
-> > even sure one actually needs more than 15 degrees down.....
-> >
-> > I have a similar situation with the rudder, in that the horn itself was
installed
-> > somewhat asymmetrically. As a result, one side hits the 'stop' bolt as
per
-> > plans, the other contacts the TS001 fitting (the way it used to be, I
believe,
-> > before the stop bolts were introduced). I was going to follow others
and add
-> > the "L-angle stop" under the stop bolt, but again, I am doublechecking
that
-> > the option of filing down the horn to clear the TS001 is truly off the
table.
-> >
-> > Thanks in advance...hope everyone is enjoying the break.
-> > I'm at the inlaws in Montreal until new year's day. Ugh :(
-> > ....I'd rather be building.
-> >
-> > ....anyone got a project in the Montreal area I can visit/talk shop with?
Jean
-> > Poirier is already flying isn't he?
-> >
-> > Rob
-> > Rebel 786
-> > Old Saybrook, CT
-> >
-> >




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[Ken]

You probably have enough to do today with all that snow but it sounds
like you might have to make a new rudder horn.

Could you maybe move the bottom rudder hinge point rearward? It really
should have a bushing or bearing there anyway. Any wear will move the
rudder forward and reduce rudder travel even more.

I suppose you could also consider riveting or bolting a second U shaped
rudder horn to the existing one. (U shaped so it does not interfere with
the pivot) That would add a bit of strength. The issue is the downward
pull from the steering springs trying to bend the horn downward AFAIK.

Ken

schaumr@dcsol.com wrote:

Ken (All),

Agree I wouldn't touch the TS-001..really just meant filing the horn(s). Your
comment regarding the stresses the rudder horn gets on the ground was
precisely the reason I was reluctant to file that, but it appears less than 5%
seems ot be O.K. (at least in Ken's case), but I will likely need more.

Rob





On 12/27/2010 4:55 AM, klehman@albedo.net wrote to rebel-builders:

-> Everyone I've talked to with a Lycoming or similar engine would seem to
-> be quite happy with 15* down elevator. That is all I have now after
-> adjusting for maximum up travel. OTOH I'd probably stick with the
-> factory recommendations with a light rotax or tail heavy airplane unless
-> a few guys with that situation can confirm stall recovery performance.
->
-> I would not be brave enough to file the TS-1. It already seems on the
-> light side to me considering it holds the stabilizer on and takes a
-> beating from the tailwheel spring. Never heard of one breaking though. I
-> did file a tiny bit of my rudder control horn (less than 5%) but don't
-> know if anyone can answer that question. I can say that I use every bit
-> of my rudder travel and would not want to give up any of it. The rudder
-> horn gets stressed pretty good when stomping on the brakes or in tight
-> turns on soft ground and I believe there is a report or two of it
-> breaking in that situation.
->
-> Mike - My tailwheel springs were on the same bolts as the rudder cable.
-> I think most Rebels are the same in order to get maximum steering and
-> swivel release.
->
-> Ken
->
-> schaumr@dcsol.com wrote:
-> > Hello Everyone,
-> >
-> > While installing my right elevator, and checking for 25 degrees down (up
is no
-> > issue) as per the manual, the elevator horn is making contact with the
-> > stabilizer spar, and limits movement to only 15 degrees down. Before
filing
-> > anything off, I thought I'd ask if anyone else has run into this, since I'm
not
-> > even sure one actually needs more than 15 degrees down.....
-> >
-> > I have a similar situation with the rudder, in that the horn itself was
installed
-> > somewhat asymmetrically. As a result, one side hits the 'stop' bolt as
per
-> > plans, the other contacts the TS001 fitting (the way it used to be, I
believe,
-> > before the stop bolts were introduced). I was going to follow others
and add
-> > the "L-angle stop" under the stop bolt, but again, I am doublechecking
that
-> > the option of filing down the horn to clear the TS001 is truly off the
table.
-> >
-> > Thanks in advance...hope everyone is enjoying the break.
-> > I'm at the inlaws in Montreal until new year's day. Ugh :(
-> > ....I'd rather be building.
-> >
-> > ....anyone got a project in the Montreal area I can visit/talk shop with?
Jean
-> > Poirier is already flying isn't he?
-> >
-> > Rob
-> > Rebel 786
-> > Old Saybrook, CT
-> >
-> >

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