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TOPRC/GatorRC P-51 Mustang 89"

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TOPRC/GatorRC P-51 Mustang 89"

Old 02-17-2017, 04:41 AM
  #226  
dionysusbacchus
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Originally Posted by Mpizpilot
Are you getting the flex with the wing bolts firmly tightened? If not,
tighten them and then try it.

I used Hysol on the wing tubes in the fuselage:

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Old 02-17-2017, 05:23 AM
  #227  
Sonny.C
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I didn't like the looks of the fuse wing tube retainers in my stang so I too added triangle stock and Hysol to shore-up the flimsy looking wing supports on both sides. Can't do anything about the wing tubes without performing some fairly major surgery through the bottom of the wings, which I'm not going to do until I find it necessary to do so.
Old 02-17-2017, 05:31 AM
  #228  
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Originally Posted by topgun25000
You must measured the cg back from where the wing root meets the fuselage.
Mine is 180 mm and it fly very well, very soft landing with 45° flap
Thanks!
Do you mix elevator with flaps?
Old 02-17-2017, 08:47 AM
  #229  
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Originally Posted by dionysusbacchus
Are you getting the flex with the wing bolts firmly tightened? If not,
tighten them and then try it.

I used Hysol on the wing tubes in the fuselage:

I had already added additional epoxy to the fuse mounts, the FG sleeves in the fuse are a joke. Paper thin. I actually think my tubes are moving in the wings. I'll have to check tonight. I was so pissed I had to walk away from it. The wing bolts are as tight as they'll go.
Old 02-17-2017, 08:49 AM
  #230  
Mpizpilot
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Originally Posted by Sonny.C
I didn't like the looks of the fuse wing tube retainers in my stang so I too added triangle stock and Hysol to shore-up the flimsy looking wing supports on both sides. Can't do anything about the wing tubes without performing some fairly major surgery through the bottom of the wings, which I'm not going to do until I find it necessary to do so.
If I find it's the sleeves/tubes in the wings, there's no way I'm cutting that wing apart.
Old 02-17-2017, 09:52 AM
  #231  
N99JH
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Originally Posted by Mpizpilot
If I find it's the sleeves/tubes in the wings, there's no way I'm cutting that wing apart.
Is there any way to apply hysol to the wing's sleeve without having to cut into the wing?
Old 02-17-2017, 10:14 AM
  #232  
Mpizpilot
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Originally Posted by N99JH
Is there any way to apply hysol to the wing's sleeve without having to cut into the wing?
I don't see how. This is a pretty bad design.
Old 02-17-2017, 11:32 AM
  #233  
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Originally Posted by zischin
Thanks!
Do you mix elevator with flaps?
No mix flap/elevator.it land easy .Just keep some throttle with flap.
I'm french ans my english is poor!!
Old 02-17-2017, 12:03 PM
  #234  
Hot Rod Todd
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I had a TopRC Zero and now a Mustang, and the wing tube's seem tight. I'll check my Mustang over closely.

I would think it shouldn't be that hard to determine if the play is in the wing or the fuse, just try to move the wing tube in each location with it out of the wing. If it's in the fuse we've seen ways to strengthen that, if your wing tube mount is loose in the wing that would be much harder.
Old 02-17-2017, 07:43 PM
  #235  
TimD.
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Originally Posted by N99JH
Questions:

What RPM do you get with the 23 X 10 4 blades prop? DLE 85 - 5900

How many flights have you accumulated? do not keep track 13-18

How does the airplane stand up to normal wear and tear?
with big gasser soso vibration is killing it, will recommend a 50-60cc
Old 02-17-2017, 07:45 PM
  #236  
TimD.
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[QUOTE=TimD.;12307390]

Dle 85 5900
13-18 do not write it down
with big gasser soso vibration is killing it, will recommend a 50
Old 02-17-2017, 07:47 PM
  #237  
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My laptop keyboard is messing up , Sorry it is hard to work with at the moment.
Old 02-18-2017, 01:40 PM
  #238  
Mpizpilot
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The tubes are loose in the fuse. The sleeves are paper thin and allow too much movement. 1/16" gap at the rear tubes, about 1/32" at the mains. Wrapped the tubes in aluminum tape and it helped a bit. Top Rc definitely has to come up with a solution for this though.

Also so swapped out the 4.5" wheels for 5.5" Wheels.
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Old 02-18-2017, 01:57 PM
  #239  
N99JH
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"1/16" gap at the rear tubes, about 1/32" at the mains."

Is the gap between the end of the tube and the inside of the fuselage?

Since the tubes were loose, could they be possible changed to more substantial ones?

How is wrapping the tubes with aluminum tape going to make them stronger?
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Old 02-18-2017, 01:58 PM
  #240  
SWORDSN
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Anyone else having wing tube issues?
Old 02-18-2017, 02:14 PM
  #241  
Mpizpilot
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Originally Posted by N99JH
"1/16" gap at the rear tubes, about 1/32" at the mains."

Is the gap between the end of the tube and the inside of the fuselage?

Since the tubes were loose, could they be possible changed to more substantial ones?

How is wrapping the tubes with aluminum tape going to make them stronger?

No, the gap is in the diameter of the tube/sleeve fit. I can put the tubes in the fuse and move them up and down. There should be zero movement.

Tubes are not the problem. The fuse mounting system is.

Nothing to do with strength. The wing tubes are loose in the fuse mounts/sleeves. Wrapping the tubes makes for a tighter fit and lessens the slop.

I even tried using a metal retaining bolt so I could crank it down. Made no difference.

I thought of making my own heavier duty FG sleeves, but then the problem would be the aluminum mounts in the fuse. Thicker sleeves would not fit inside the mounts.

In my opinion, the fix is the factory has to mill new aluminum tube mounts that would allow a thicker, better fitting FG sleeve.

Last edited by Mpizpilot; 02-18-2017 at 02:19 PM.
Old 02-18-2017, 02:19 PM
  #242  
N99JH
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Default Wing "Flexing"

Mpizpilot

I went to my shop and looked at my kit to better understand what you say. I think that you misunderstand the purpose of the tubes in the fuselage - they are NOT load carrying structural components. They are simply a guide for the aluminum wing tubes which are inserted into the wings. The load is carried by the machined aluminum rings that are bolted to a plywood former and the plywood wing profile plates.
If the fuselage flexes, it is because it is made of thin fiberglass layer - this can be easily addressed by adding a couple of 1/4", cross grained balsa formers to stiffen the area behind the pilot's seat.

Joshua
Old 02-18-2017, 02:20 PM
  #243  
Mpizpilot
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Originally Posted by SWORDSN
Anyone else having wing tube issues?
Read back through the thread.
Old 02-18-2017, 02:25 PM
  #244  
Mpizpilot
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Originally Posted by N99JH
Mpizpilot

I went to my shop and looked at my kit to better understand what you say. I think that you misunderstand the purpose of the tubes in the fuselage - they are NOT load carrying structural components. They are simply a guide for the aluminum wing tubes which are inserted into the wings. The load is carried by the machined aluminum rings that are bolted to a plywood former and the plywood wing profile plates.
If the fuselage flexes, it is because it is made of thin fiberglass layer - this can be easily addressed by adding a couple of 1/4", cross grained balsa formers to stiffen the area behind the pilot's seat.

Joshua
I understand fully the the load is carried by the ring mounts, the ring mounts and FG sleeve diameter is larger then the wing tube, period. My fuse is not flexing. My wing tubes are loose in the ring mounts/sleeves. The wing tubes are too loose in the fuse.

If you are able to insert your tubes into the fuse without your wings on, and the tubes have no movement within the sleeves, then your are not expierencing the same problem I am.
Old 02-18-2017, 06:53 PM
  #245  
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The ply former that the aluminum rings mount to, is too weak it needs to be stiffened with additional an additional ply spar glued to the back of it. That is what I had to do to mine.
Old 02-18-2017, 07:32 PM
  #246  
N99JH
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Originally Posted by TimD.
The ply former that the aluminum rings mount to, is too weak it needs to be stiffened with additional an additional ply spar glued to the back of it. That is what I had to do to mine.
I totally agree, this definitely sounds like a step in the right direction
Old 02-18-2017, 07:42 PM
  #247  
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"In my opinion, the fix is the factory has to mill new aluminum tube mounts that would allow a thicker, better fitting FG sleeve."

Seems to me that fabricating a new, robust, mounting system is a fairly simple matter. Replace the flimsy tubes inside the fuselage with brass or steel, thin wall tubes that telescope over the wing tubes - brazed to a flat plate that will be bolted to the plywood former.

Alternately, machining a tight fitting, wider metal bracket to replace the factory one is also a rather simple solution.

True, the factory should have thought about that but right now it is what it is.
Old 02-19-2017, 04:57 PM
  #248  
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I have been able to get back to my P51, after working on my Spitfire, looks like my wing tubes are ok, sorry to hear others are having trouble. I have most of the electrics in and installed, same with the gas tank, engine along with throttle and choke servo's. With the majority of the internal bits installed I have started putting the rivets on the fuselage. Once the vinyl rivets are on I hit them with a coat of rattle can aluminum paint. Rivets and screws are from Chad Veich.


Here are a couple of shots of the tail.



Cheers
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Old 02-20-2017, 12:59 PM
  #249  
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Great details Rick!
Old 02-20-2017, 02:29 PM
  #250  
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Nicely done!

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