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T-One Models 2.7m F-22 build

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T-One Models 2.7m F-22 build

Old 03-15-2020, 12:50 PM
  #151  
Looping31
 
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Originally Posted by FenderBean View Post
Left engine put the yellow connector at 11 oíclock position and on the right engine put the yellow connector at 5 oíclock position
It's much better like this, but I have sometimes eng 1 picking up the eng 2 RPM...
Old 03-15-2020, 01:13 PM
  #152  
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U could use the mumetal this is the magnetic barrier available on eB

ay
Old 03-15-2020, 02:04 PM
  #153  
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This was the recommendation from Gaspar when I showed him my setup, The sensors are to the right of the connector. So in my setup 12 and 6 o'clock, and I think its due to the signal cone but who knows. During my taxi text and ground runs in the model, I didnt see any signs of cross talk.

Last edited by FenderBean; 03-15-2020 at 02:06 PM.
Old 03-15-2020, 02:33 PM
  #154  
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Install the stuff , the difference between the turbines are almost invincible but most likely one of the turbine will run leaner because of the wrong parameters readings and this will cost off premature ngv destruction, even if you rotate them please still use the material to be sure that nothing will disturb the magnetic field the magnets are very strong and could be read by the sensor from more than 3Ē .
Old 03-15-2020, 03:56 PM
  #155  
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Do not fly it if your seeing rpm from opposite engine or it Will end up in a trash bag ..... i know been their done that.
Old 03-15-2020, 07:46 PM
  #156  
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Originally Posted by sysiek View Post
U could use the mumetal this is the magnetic barrier available on eB

ay

I already have Mumetal between the engines (see my post #146). Not enough.
Next step is to move away the turbine from each other by removing the divergence and add another plate of mumetal.
Old 03-15-2020, 08:38 PM
  #157  
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Arnaud have you tried your motors in the position I stated?
they need to be 180 degrees from each other.

Last edited by FenderBean; 03-15-2020 at 08:40 PM.
Old 03-15-2020, 08:39 PM
  #158  
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I installed the metal on each bay pass and between them total of 4 barriers + I reinstalled the sensors to opposite sides not rotating the turbines two super eagles the relocation was very easy and this stoped the problem, I think itís depending on the mumetal thickness.
Old 03-16-2020, 03:40 AM
  #159  
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Originally Posted by FenderBean View Post
Arnaud have you tried your motors in the position I stated?
they need to be 180 degrees from each other.
Yes, much better, thank you, but not enough. Problem solved when manually distancing turbines from each other by 1.5íí
So I plan to do new engine mounts with a reduce divergence.
Old 03-16-2020, 06:51 AM
  #160  
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Last try with 2 more mumetal arched plates.
No more cross-talking between RPM sensors.
Old 03-16-2020, 06:55 AM
  #161  
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Originally Posted by Looping31 View Post
Yes, much better, thank you, but not enough. Problem solved when manually distancing turbines from each other by 1.5’’
So I plan to do new engine mounts with a reduce divergence.
how are you testing the cross talk issue you are having?
how heavy is that shield?

Last edited by FenderBean; 03-16-2020 at 06:59 AM.
Old 03-16-2020, 07:51 AM
  #162  
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Originally Posted by Looping31 View Post
Last try with 2 more mumetal arched plates.
No more cross-talking between RPM sensors.
Wow, this looks heavy, the mumetal plates. How thick are these? Definitely no way these are 0.35T ones from Ebay.
Old 03-16-2020, 07:55 AM
  #163  
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I have the xicoy telemetry for both turbine, so RPMs are displayed on my radio screen.
When doing a starter run, Iím able to see if there is a RPM cross pickup from the other engine.
Mumetal shield are heavy, too late to weight it, but I need now 2kg of lead in the nose.
Old 03-16-2020, 07:59 AM
  #164  
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Originally Posted by cycross View Post
Wow, this looks heavy, the mumetal plates. How thick are these? Definitely no way these are 0.35T ones from Ebay.
My mumetal shield is 0,1mm.
I glued it on a glass fiber plate of 1mm.
Old 03-16-2020, 11:44 AM
  #165  
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Donít worry about the weight. This plane flies light. You need them engines running. Thatís the priority
Old 03-16-2020, 02:08 PM
  #166  
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Originally Posted by gunradd View Post
Donít worry about the weight. This plane flies light. You need them engines running. Thatís the priority
Im not having a cross talk issue with mine
Old 03-16-2020, 04:05 PM
  #167  
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Originally Posted by FenderBean View Post
Im not having a cross talk issue with mine
thatís good! But be sure. I didnít have cross talk all the time on my F18. I flew it many times before it happened. Iím thinking conditions have an effect on the magnetism of the rpm sensors.

dirk told me he was not able to duplicate cross talk at the shop but I was able to duplicate it on the English lightning. Also Jim lost his F18 and had cross talk. I would never do a twin without the assurance of nuemetal at the least. But I lost over 10k and almost left the hobby because of crosstalk. So itís a sore subject with me. You wonít get it all the time. Itís that time you do your done.
Old 03-24-2020, 09:46 AM
  #168  
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My F22 is now ready for maiden. Itís going to be a very long waiting to the end of the quarantine.
Thank you to Fenderbean and Gunradd for paving the way.
The following 3 users liked this post by Looping31:
Canadian Man (03-24-2020), patf (03-24-2020), skunkwurk (03-24-2020)
Old 03-24-2020, 10:47 AM
  #169  
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Looks fantastic!!! Double check your rudders!!
Old 03-24-2020, 12:26 PM
  #170  
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Originally Posted by gunradd View Post
Looks fantastic!!! Double check your rudders!!
Yes, Iíve done everything possible.
Levelled up the rudder servo mounts in order to have the rudder drive sitting deep into the fitting.
Applied metal sheet in the servo fitting to reduce free play, and hot glue when coupling.
I screwed the fin fastener.
I reinforced the structure around the fin spar tube inside the fuse and on vertical side to be sure any aero-elastic vibrations canít amplify.
Thanks again for all your feedbacks.
Canít wait to fly this beauty now.
Old 03-24-2020, 07:00 PM
  #171  
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Love your weathering effects Looping31! Pristine paint just doesn't look right with this plane. I think I will do the same, seeing it look so good.
Just discovered that mine being the early prototype the fin fastener doesn't even have holes on it, let alone a screw. One more area to address.
Also ordered the precautionary mumetal. Thanks all for the learning pointers.

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