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Avonds F-16 build

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Avonds F-16 build

Old 07-21-2008, 12:23 PM
  #126  
pjacq
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Default RE: Avonds F-16 build

Whare is the cg for the plane I have done some work on one and need the to rebalance the plane .


thanks Paul
Old 07-21-2008, 02:05 PM
  #127  
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Default RE: Avonds F-16 build

There is a small hole on the fuselage wing root. That is the recommended cg. I fly mine about 1/4" farther aft than that.
Old 07-21-2008, 04:48 PM
  #128  
Mark Basel
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Default 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
Old 02-17-2010, 06:28 AM
  #129  
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Default RE: Avonds F-16 build

Hello!
Can anyone tell me what kind of Robart retracts fits this plane ?

For mains and nose.

Best regards

Thomas
Old 10-09-2016, 02:53 AM
  #130  
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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
Old 10-09-2016, 03:37 AM
  #131  
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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.

Last edited by Craig B.; 10-09-2016 at 08:01 AM.
Old 10-09-2016, 04:45 AM
  #132  
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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
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Old 10-09-2016, 08:07 AM
  #133  
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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?
Old 10-09-2016, 10:00 AM
  #134  
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Never heard of cf flexing. You will tear stab off before cf bends.
Old 10-09-2016, 04:21 PM
  #135  
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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.
Old 10-09-2016, 04:57 PM
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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,

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




Old 10-10-2016, 04:35 AM
  #137  
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I've had several of the Avonds F-16s. Build it the way Philip recommends and you will have a great flying lightweight jet. I have a set of gear for one and am thinking about doing another one. Philip's kits are outstanding!
Old 10-10-2016, 06:30 AM
  #138  
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Originally Posted by adec4
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,

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




You are trying to set it up similar to Skymaster, which is hit and miss. I've received stabs from SM that I had to throw away as the carbon rods twisted beyond acceptable. The longer they are the worse it gets. Stick to Avonds instructions....its a proven design.
Old 10-10-2016, 08:52 AM
  #139  
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Thanks for the heads up Vince. Will have to check mine now.
Old 10-10-2016, 07:51 PM
  #140  
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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 ..
Old 10-11-2016, 06:37 AM
  #141  
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Yeah that's no good. Can't be having that.
Old 10-11-2016, 08:16 AM
  #142  
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I know this is a little off topic, but does anyone have or know where I can find a decent used set of the Avonds Scale main gear? Just throwing it out there. Thanks.
Old 10-12-2016, 05:01 AM
  #143  
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Originally Posted by adec4
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 ..
actually, that's not so bad. On my SM Vipers I can easily twist them 1/4" or even more.......have never fluttered or anything. On my Tams it was closer to 1/2", and they were tailerons....still flew good.

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