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TF 1/5 Scale P-51 ARF Assembly (1ST MISHAP!!!)

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Old 03-06-2018, 08:41 PM
  #4051  
rossmick
 
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Looks like the wing came in at 7.8 #s and the total plane has weighed in at 23.7 #s. The gear actually weighs 3 #s so they are a little heavier. I also have a removable air scoop. I did move the engine forward 3/16" and also repositioned the three batteries vertically up against the inside firewall, so now I was able to remove .9 #s of lead weight from the nose. To help the balance, I also went with a smaller servo in the tail for the tail wheel.
May not get to fly the plane until next week do to a scheduled event this Friday - Sunday, and all the week day competition practice.
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Old 03-07-2018, 05:20 PM
  #4052  
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I was running my P-51 tonight and the Tony Howard exhaust stack rattled loose. I used 30 min epoxy and 2 screws to secure it as recommended by the instructions. I am thinking about trying Hysol 9462 but don't really want to buy the whole applicator kit for $62 at this time. Has anyone used this stuff? Can I mix it like regular epoxy and apply to the shroud or do I need that expensive applicator/kit?
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Old 03-07-2018, 07:19 PM
  #4053  
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Originally Posted by spitfire66 View Post
I was running my P-51 tonight and the Tony Howard exhaust stack rattled loose. I used 30 min epoxy and 2 screws to secure it as recommended by the instructions. I am thinking about trying Hysol 9462 but don't really want to buy the whole applicator kit for $62 at this time. Has anyone used this stuff? Can I mix it like regular epoxy and apply to the shroud or do I need that expensive applicator/kit?
Yes, I lay out on a plastic lid, mix with a mixing stick and apply.
John
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Old 03-07-2018, 07:50 PM
  #4054  
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Default Broken wing

Spitfire66
Hysol is great stuff, but I do use the applicator. I know that some have make up a double dowel glued/screwed to a piece of plywood and push the mixture out on to wax paper and then mix it by hand. looks like it is equal amounts to mix, and it will harden over night. When I am finished, I take the nozzles and push air through them with the compressor and then clean them with acetone so I can reuse them, that seems to work fine.

Down to the fine points now on the 51. Gear was catching the scissors link against the back of the wheel well. I had hoped to not cut an opening in the glass for the air cylinder but I had to open it so I could push the wall back far enough to allow the link to pass. I elected to make the area over the cylinder removable so I expanded the wheel well cover to handle this. The wheel well fiberglass is not really held very well in this area, so I put in some hardwood strips so I can screw the wheel well cover in position. It also allows me to get to the air lines and cylinder for inspection. Photos shows attach points and then the paper templates. Tomorrow I'll cut the 1/16 ply, cover them and screw them in.
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Last edited by rossmick; 03-07-2018 at 07:53 PM.
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Old 03-29-2018, 03:53 PM
  #4055  
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Some progress after finishing the wing mods with install of a scale battery, instrument panel and gunsight.

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Old 07-11-2018, 07:38 PM
  #4056  
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Have not heard anything on this thread for quite some time. Any news lately? Or is everyone just flying? I'm still in process of building my 2nd TF P51 C "Dody). Painting has me slowed down.
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Old 07-11-2018, 08:57 PM
  #4057  
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probably they have either fallen apart or crashed!!!!!!!
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Old 07-13-2018, 09:16 PM
  #4058  
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Ah, no...still going strong!
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Old 07-14-2018, 08:25 AM
  #4059  
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NICE. Makes me want to work on my P-51C "Dody". Having a hard time getting into the painting.
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Old 07-15-2018, 11:56 AM
  #4060  
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Originally Posted by Ralph White View Post
Have not heard anything on this thread for quite some time. Any news lately? Or is everyone just flying? I'm still in process of building my 2nd TF P51 C "Dody). Painting has me slowed down.
Ralph White
I just started putting the one that been in my basement for 6 years together last week,, crashed my zero a few weeks ago,,,,, since it's late in the season, I'll fly it stock arf scheme this year,, Mod it over the winter probably
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Old 08-06-2018, 02:41 PM
  #4061  
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Kit didn't come with a decal sheet,,, so had Callie make me up a Twilight Tear set

Gotta love the Giganomous RCU pictures, LOL I forgot why I stopped posting here

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Old 08-06-2018, 06:23 PM
  #4062  
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This is the current build state of my new James Bates B model, with a Vic Catalasan molded fuse. The fiber glassing is finished, landing gear installed, engine mounted, and carbon fiber reinforcement completed. It weighs 17 pounds in this state, and should gross under 24 pounds with the rest of the flight equipment installed, and a paint job. It actually balances right on the CG now. All I have to do is mount the rest where it won't disturb the CG. DA 60 for power.

I had to retire my TF P51-B, at least until I can fix the fuselage cracks it developed. I knew about its tendency to break up after about 100 flights, I had lost my second plane to this years ago. I have been reinforcing the fuse structure in the weak areas ever since. It went past its 300th flight and I did a close inspection to get it ready at the beginning of the flying season. Thats when I spotted two new cracks, one at the front of the horizontal stab and the other on the right side over the thick part of the wing. Either crack would have caused it to break in flight.

Instead of using the molded wing fairings that come with the ARF kit, I had replaced them with a built up wing fairing for a better look. It was obvious that the stronger wing fairing was the only thing holding the fuse together! I am currently moving on from both the TF Mustang and the H9 D model to the James Bates P 51B- C so that I can control the design strength of these planes, When you buy an ARF you only get what you pay for and have to settle for the weak wood and sub-standard sticky stuff the far east calls GLUE that they use in the manufacture of their planes. I'm not being overly critical of these two particular brand's models, I have been assembling ARF models of many different brands since 1974 and have found that they are ALL the same in this respect. I guess their logic is that the pilots will crash them long before any poor quality issues show up, so build 'em cheap.

I reinforce the obvious weak points, but when the whole part has the same construction it will just break somewhere else. My new plane has a molded fiber glass fuse with carbon fiber reinforced bulkheads and I replace the critical wood parts with aircraft grade plywood. I changed the wing spars for much better hardwood spars, then built a removable retract mount that can be removed to replace damaged gear mounts with identical parts I carry with me. I don't believe it is possible to beef the gear mounts enough to handle every hard landing so I made it easy to fix when a bad landing does cause damage.
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