Avonds F-16 build
#128
Thread Starter
My Feedback: (24)
RE: Avonds F-16 build
Paul, I dug out the building instructions, the CG is 141mm in front of the of the forward edge of the fuselage former F-4. and the holes on the side of the fuse are used for later CG checks. I balance the Falcon with the hanging method right on the CG with the gear down. Fly's good there.
Thanks
mb
Thanks
mb
#130
Join Date: Apr 2006
Location: perthaustralia, AUSTRALIA
Posts: 31
Likes: 0
Received 0 Likes
on
0 Posts
g'day gents
im after some advise please
im about half way through my avonds f16 build and ive desided to install the elevator control horns on the inside of the fuse so as not to have any control linkages
showing ,, ive lengthened the carbon fiber 8mm shaft to accommidate the internal horns so theres still the same amount of rod in the tailerons
but now ive discovered there is some twist in the pivot shaft ...
have any of you done this on your models and flown them without any problems ??
any help would be great
regards vince
im after some advise please
im about half way through my avonds f16 build and ive desided to install the elevator control horns on the inside of the fuse so as not to have any control linkages
showing ,, ive lengthened the carbon fiber 8mm shaft to accommidate the internal horns so theres still the same amount of rod in the tailerons
but now ive discovered there is some twist in the pivot shaft ...
have any of you done this on your models and flown them without any problems ??
any help would be great
regards vince
#131
Hi Vince,
I modifed mine in that way. Has not flown yet but the mods got the thumbs up from Avonds. Will see if I can dig up some pics of what I did.
I modifed mine in that way. Has not flown yet but the mods got the thumbs up from Avonds. Will see if I can dig up some pics of what I did.
Last edited by Craig B.; 10-09-2016 at 08:01 AM.
#132
Join Date: Apr 2006
Location: perthaustralia, AUSTRALIA
Posts: 31
Likes: 0
Received 0 Likes
on
0 Posts
g'day craig
i just took some pics of my work ,, the issue is the length of the pivot shaft 90mm
im hoping i dont have to drill the shaft out and replace it with something else
i just took some pics of my work ,, the issue is the length of the pivot shaft 90mm
im hoping i dont have to drill the shaft out and replace it with something else
#133
Hi Vince,
do you mean that the carbon rod is not torsionally stiff enough under load? It looks like you are using a modified yellow f18 twin elevator arm. Is this the one you got off Andy?
do you mean that the carbon rod is not torsionally stiff enough under load? It looks like you are using a modified yellow f18 twin elevator arm. Is this the one you got off Andy?
#135
Tom, the problem is not flexural stiffness but more so torsional stiffness. Depending on the fibre orientation of the layup, a carbon rod may not be very stiff in a torsional/ twisting sense. Some carbon rods have a primarily longitudinal fibre orientation and they are not stiff in a torsional sense. Others have a helical layup and they are reasonably stiff in a torsional sense. I discovered this issue on my Carf mig 29 where I was dealing with rather large stabs that magnify the problem.
i think Vince is suggesting a lack of torsional stiffness.
i think Vince is suggesting a lack of torsional stiffness.
#136
Join Date: Apr 2006
Location: perthaustralia, AUSTRALIA
Posts: 31
Likes: 0
Received 0 Likes
on
0 Posts
g'day gents
i just received an email from philip avonds , and he recommends to use the standard setup as the manual states
and yes craig this is the kit from andy !!
BUGGER BUGGER BUGGER
Hi Vince,
Best regards,
Philip Avonds
i just received an email from philip avonds , and he recommends to use the standard setup as the manual states
and yes craig this is the kit from andy !!
BUGGER BUGGER BUGGER
Hi Vince,
ive discovered that im getting some torsional twisting in the elevator
This is not a surprise, the carbon rod was not intended to act as a torque rod. Furthermore, there's no real anchoring in the flying surface itself, so I recommend to revert to the standard set up!have you heard of anyone else doing this in the past without any problems ??
No, not without problems I'm afraid…Best regards,
Philip Avonds
#138
My Feedback: (57)
g'day gents
i just received an email from philip avonds , and he recommends to use the standard setup as the manual states
and yes craig this is the kit from andy !!
BUGGER BUGGER BUGGER
Hi Vince,
Best regards,
Philip Avonds
i just received an email from philip avonds , and he recommends to use the standard setup as the manual states
and yes craig this is the kit from andy !!
BUGGER BUGGER BUGGER
Hi Vince,
ive discovered that im getting some torsional twisting in the elevator
This is not a surprise, the carbon rod was not intended to act as a torque rod. Furthermore, there's no real anchoring in the flying surface itself, so I recommend to revert to the standard set up!have you heard of anyone else doing this in the past without any problems ??
No, not without problems I'm afraid…Best regards,
Philip Avonds
#140
Join Date: Apr 2006
Location: perthaustralia, AUSTRALIA
Posts: 31
Likes: 0
Received 0 Likes
on
0 Posts
i was trying to hide the linkages in the fuse to get it as close to scale as i could
the tork rods that andy gave me in the kit i believe came from the avonds f15 as they are mounted in a differant way using bearings on a mounting plate
so i thought i could use the same method but the tork rids are 90mm long from the tailerons to the control horn which gave me around 10/15mm of play
at the trailing edge without using any force ,which i thought was totally unacceptable ..
the tork rods that andy gave me in the kit i believe came from the avonds f15 as they are mounted in a differant way using bearings on a mounting plate
so i thought i could use the same method but the tork rids are 90mm long from the tailerons to the control horn which gave me around 10/15mm of play
at the trailing edge without using any force ,which i thought was totally unacceptable ..
#143
My Feedback: (57)
i was trying to hide the linkages in the fuse to get it as close to scale as i could
the tork rods that andy gave me in the kit i believe came from the avonds f15 as they are mounted in a differant way using bearings on a mounting plate
so i thought i could use the same method but the tork rids are 90mm long from the tailerons to the control horn which gave me around 10/15mm of play
at the trailing edge without using any force ,which i thought was totally unacceptable ..
the tork rods that andy gave me in the kit i believe came from the avonds f15 as they are mounted in a differant way using bearings on a mounting plate
so i thought i could use the same method but the tork rids are 90mm long from the tailerons to the control horn which gave me around 10/15mm of play
at the trailing edge without using any force ,which i thought was totally unacceptable ..