REFLECTOR:Re: Aileron Rigging Frustration
Wayne
reflector@tvbf.org
Sat, 3 Apr 2004 10:44:35 -0500
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Been there , Done that. I got disgusted and drilled new holes in the =
bellcranks about 1/2 inch in toward the center.=20
My ailerons are fairly stiff at maneuvering speeds but they have full =
travel.
Wayne
----- Original Message -----=20
From: NMFlyer1@aol.com=20
To: reflector@tvbf.org=20
Cc: brendanO@velocityaircraft.com=20
Sent: Saturday, April 03, 2004 10:11 AM
Subject: REFLECTOR:Re: Aileron Rigging Frustration
Well, no, I have not got the ailerons rigged correctly yet, and have =
talked with Brendan a couple times. Here's the scoop:
I have the 173 Elite Model, so others may be different.=20
I followed the plans in my manual and could not get 2.5" of travel (in =
fact the maximum I could get was 2-7/16 up and 2-5/16 down). =20
I was told that there should be no differential aileron (more up than =
down).=20
I ended up getting the "new" instructions off of the Velocity Site, =
and the instructions are Very different. Following them dictated that I =
buy more aluminum and make a new set of Cable Clamp Brackets. After =
following the instructions to the letter, I could still not get proper =
travel, so I called the factory again. The response was that my approach =
angle (cable to wing root bellcranks) has to be off. Well, 90 degrees =
is pretty easy to measure and believe me... I have measured it at least =
a hundred times over the last few weeks.=20
Finally, out of frustration (and thinking I just may be loosing it) I =
had my Dad check things out. He's an Engineer at Sandia National Labs, =
and can figure these things out Much faster than I would be able to do. =
He found some interesting things:
In order to get 2.5" of up and down travel (5" total movement), you =
have to have 3.14" of travel in the aileron cables. Since the cables =
have only 3" of travel, the maximum up/down travel possible is 4.75" (or =
2-3/8 up & 2-3/8 down). The instructions say that you can get 2.5" =
up/down travel out of a properly rigged system, and that is impossible!=20
This is based on some other things:=20
1, the bell crank at the back of the Keel has a 4" lever arm.
2, the bell cranks at the wing root also have a 4" lever arm.
3, the ratio between the bell crank turning, and the aileron =
movement is 1:1 (one to one)
I measured mine, and it is essentially 1:1.
4. The travel possible is based on zero slop in the system! It is =
the best you will ever get.=20
5. Hope that my keel plate is correctly drilled from the factory. =
The approach angle of the aileron cables at the keel is 82-degrees per =
side. This will induce a small amount of differential in the system and =
slightly limit total possible travel.=20
Conclusion: Well, after weeks of work trying to obtain the travel =
stated in the instructions, I am now frustrated and enlightened. It is =
not possible! =20
Today I will go out and try and adjust the system to get the =
maximum possible with what the factory provided me: That is 2-3/8 =
up/down travel.=20
Question: those flying the 173 Elite, is that sufficient?=20
Possible changes: In order to achieve more aileron travel, I have =
thought of 3 possibilities:
1, Increase the length (lever arm) of the keel bellcrank by about =
3/8" (would get more travel and more leverage)
2, Decrease the lever arm of the wing root bell cranks by about 3/8" =
would get more travel at the aileron torque tube, but less leverage and =
therefore stiffer ailerons). This could be done by welding the hole shut =
and drilling a new one as hole edge distances could not be maintained by =
simply drilling a new hole. =20
3, Get cables that have more travel than the 3" the factory =
provides.=20
So, there is the next chapter in frustration. I will let you know the =
next chapter soon. Basically I am no more nuts than I was before, and =
the limitation is in the system.. not the builder. Whew!!=20
Kurt Winker
173 FGE ... flippin flipper fiddelin'
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<DIV>Been there , Done that. I got disgusted and drilled new holes in =
the=20
bellcranks about 1/2 inch in toward the center. </DIV>
<DIV>My ailerons are fairly stiff at maneuvering speeds but they have =
full=20
travel.</DIV>
<DIV>Wayne</DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3DNMFlyer1@aol.com =
href=3D"mailto:NMFlyer1@aol.com">NMFlyer1@aol.com</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dreflector@tvbf.org=20
href=3D"mailto:reflector@tvbf.org">reflector@tvbf.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Cc:</B> <A=20
title=3DbrendanO@velocityaircraft.com=20
=
href=3D"mailto:brendanO@velocityaircraft.com">brendanO@velocityaircraft.c=
om</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, April 03, 2004 =
10:11=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> REFLECTOR:Re: Aileron =
Rigging=20
Frustration</DIV>
<DIV><BR></DIV>
<DIV>Well, no, I have not got the ailerons rigged correctly yet, and =
have=20
talked with Brendan a couple times. Here's the scoop:</DIV>
<DIV> </DIV>
<DIV>I have the 173 Elite Model, so others may be different. </DIV>
<DIV> </DIV>
<DIV>I followed the plans in my manual and could not get 2.5" of =
travel (in=20
fact the maximum I could get was 2-7/16 up and 2-5/16 down). =
</DIV>
<DIV> </DIV>
<DIV>I was told that there should be no differential aileron (more up =
than=20
down). </DIV>
<DIV> </DIV>
<DIV>I ended up getting the "new" instructions off of the Velocity =
Site, and=20
the instructions are Very different. Following them dictated that I =
buy more=20
aluminum and make a new set of Cable Clamp Brackets. After following =
the=20
instructions to the letter, I could still not get proper travel, so I =
called=20
the factory again. The response was that my approach angle (cable to =
wing root=20
bellcranks) has to be off. Well, 90 degrees is pretty easy to =
measure=20
and believe me... I have measured it at least a hundred times over the =
last=20
few weeks. </DIV>
<DIV> </DIV>
<DIV>Finally, out of frustration (and thinking I just may be loosing =
it) I had=20
my Dad check things out. He's an Engineer at Sandia National Labs, and =
can=20
figure these things out Much faster than I would be able to do. He =
found some=20
interesting things:</DIV>
<DIV> </DIV>
<DIV> In order to get 2.5" of up and down travel (5" total =
movement), you=20
have to have 3.14" of travel in the aileron cables. Since the cables =
have only=20
3" of travel, the maximum up/down travel possible is 4.75" (or =
2-3/8 up=20
& 2-3/8 down). The instructions say that you can get =
2.5"=20
up/down travel out of a properly rigged system, and <STRONG>that is=20
impossible</STRONG>! </DIV>
<DIV> </DIV>
<DIV>This is based on some other things: </DIV>
<DIV> 1, the bell crank at the back of the Keel has =
a 4"=20
lever arm.</DIV>
<DIV> 2, the bell cranks at the wing root also have =
a 4"=20
lever arm.</DIV>
<DIV> 3, the ratio between the bell crank turning, =
and the=20
aileron movement is 1:1 (one to one)</DIV>
<DIV> I measured mine, and =
it is=20
essentially 1:1.</DIV>
<DIV> 4. The travel possible is based on=20
<STRONG>zero</STRONG> slop in the system! It is the best you will ever =
get.=20
</DIV>
<DIV> 5. Hope that my keel plate is correctly =
drilled=20
from the factory. The approach angle of the aileron cables at the keel =
is=20
82-degrees per side. This will induce a small amount of differential =
in the=20
system and slightly limit total possible travel. </DIV>
<DIV> </DIV>
<DIV>Conclusion: Well, after weeks of work trying to =
obtain the=20
travel stated in the instructions, I am now frustrated and =
enlightened. It is=20
not possible! </DIV>
<DIV> Today I will go out and try and adjust the system to =
get the=20
maximum possible with what the factory provided me: That is =
2-3/8=20
up/down travel. </DIV>
<DIV> </DIV>
<DIV>Question: those flying the 173 Elite, is that sufficient? =
</DIV>
<DIV> </DIV>
<DIV>Possible changes: In order to achieve more aileron travel, =
I have=20
thought of 3 possibilities:</DIV>
<DIV> </DIV>
<DIV>1, Increase the length (lever arm) of the keel =
bellcrank by=20
about 3/8" (would get more travel and more leverage)</DIV>
<DIV>2, Decrease the lever arm of the wing root bell =
cranks by=20
about 3/8" would get more travel at the aileron torque tube, but less =
leverage=20
and therefore stiffer ailerons). This could be done by welding the =
hole shut=20
and drilling a new one as hole edge distances could not be =
maintained by=20
simply drilling a new hole. </DIV>
<DIV>3, Get cables that have more travel than the 3" =
the=20
factory provides. </DIV>
<DIV> </DIV>
<DIV>So, there is the next chapter in frustration. I will let you know =
the=20
next chapter soon. Basically I am no more nuts than I was before, and =
the=20
limitation is in the system.. not the builder. Whew!! </DIV>
<DIV> </DIV>
<DIV>Kurt Winker</DIV>
<DIV>173 FGE ... flippin flipper fiddelin'</DIV>
<DIV> </DIV>
<DIV> </DIV></BLOCKQUOTE></BODY></HTML>
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