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  1. #326

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    RE: T-28 Dave Platt

    Larry, Good luck on the P-38 maiden.


    Boyd, I was going to ask what you guys are going to use for power. I was checking the Saito Radials but what they have is either to powerful or to weak for what I want. The Moki 180 is on my list right now. The filler I use is a small amount of finishing resin mixed with plenty of micro baloons until it is as thick as peanut butter. The thicker it is the easier it is to sand. I use finger diped in 90% alcohol to smooth out the surface. The nave lights are made the same way.

    Dean



  2. #327

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    RE: T-28 Dave Platt

    Dean,

    I went with a Fuji BT-50ESI (46.50cc). In order to fit in the cowl without making holes on the top I inverted the engine. By doing this you have to move the engine forward of the nose gear rails. I've loaded some pictures for your review. Although I have quoted the move of the engine forward 2 1/2" double check for your self to make sure this works for you. If you want the whole series onhowI did the entire engine mount etc.I can send them to you.

    Larry,

    Good luck on the maiden flight of the P-38

    Boyd
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  3. #328

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    RE: T-28 Dave Platt

    Images of the ajustable cowl flap and tested out the finish on the rudder.

    Dean
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  4. #329

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    RE: T-28 Dave Platt

    Dave,

    How do you do your rivets?

    Neat idea for the cowl flaps.

    Have you decided on an engine?

    Boyd.

  5. #330

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    RE: T-28 Dave Platt

    The surface is covered with Flight metal first. The rivets are punched out of a sheet of .003 aluminum over some hard cork or rubber which gives them a dome. They are placed 1/4 inch apart on 1/6 th scale T-28 and they are 5/64 th in diameter.
    On the rivets I use a a bottle with 1/32 tube to put a small drop of Formula 560 glue on a Premark line on the model holding the rivet with a small ball driver that was rubbed on bees wax it is placed it in the proper location. I used a small hex driver for a Handel in order to hold onto the tube. The tube will get cogged at times but a couple raps on my bench and the rivets fall out. With bees wax on the end of the ball driver you can just touch the top of the dome and it will pick it right up. I don't know weather you can see it but there is a rivet on the end of the driver.

    Dean
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  6. #331

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    RE: T-28 Dave Platt

    Dean,
    To say I'm speechless would be a gross understatement, the workmanship is museum quality and the detail the rivets add is awesome.
    Two questions, are you going to drive the cowl flaps with mini or full size servos and are you driving them with the throttle channel.
    Also are you using the flite metal over the fiberglass to simulate the panels?
    I figure I have at least another week of repair on the P-38 and then finally back to the Trojan, I hope you don't mind that I am going to be stealing your cowl flap idea.
    Boyd, it's a shame Dean and I will be so far away from you, I for one could use all the tutelage I can get for my build from you two.
    If my Trojan comes out 1/3 as well as yours I will be a very happy camper.

  7. #332

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    RE: T-28 Dave Platt

    Larry,

    Thanks for the compliment. In terms of getting ideas, this forum is a great way to do it. I'min a constact state oflearning myself.

    Dean,

    Great Idea for the rivets. I'll have to try that.

    Boyd.

  8. #333

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    RE: T-28 Dave Platt

    Boyd,
    Since I'm still working full time I'm shocked that I get as much accomplished as I do. The idea of the rivets is certainly piquing my interest but it would take me another 3 years of building
    Hopefully I will be back on the Trojan in 2 weeks and I con continue tackling the first flap.
    The weather here has been decent for flying so besides flying either sat or sun and spending a bit of time with the wife there hasn't been mush time left for building.

    Larry

  9. #334

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    RE: T-28 Dave Platt

    Larry, Thanks, I'll decide how to move the cowl flaps after the engine is installed meanwhile the nut that holds the drive rod for the flaps is tightened to the point where I can move them by hand. The surface is fiber glassed first and the Flite metal is installed in the same matter as the full scale. On the T-28 the panels overlap so I overlap them 1/8 th of an inch Start on the tip of the stab and work in and forward on the fuse bottom first then up the sides as you go forward. Sounds like you had a mishap with the 38 hope it wasn't too bad. I enjoy putting building Ideas out so others can use them.
    Dean

  10. #335

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    RE: T-28 Dave Platt

    Dean,

    Where do you get the .003 aluminum? It sound like it's as thin as aluminum foil.

    Boyd.

  11. #336

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    RE: T-28 Dave Platt

    Here you go Boyd. McMaster-Carr search for Aluminun shim stock. I use both the .003 and the .005 rolls of the tempered material. Aluminun foil is soft and I use it on most of the surface. I did build a P-39 where I used .005 on about 50%of the surface.

    Dean
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  12. #337

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    RE: T-28 Dave Platt

    Hey Dean,
    Beautiful work on the P-39, are you going to paint the flite metal or leave it natural?


    Larry

  13. #338

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    RE: T-28 Dave Platt

    Larry, This is the subject I hope to copy.
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  14. #339

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    RE: T-28 Dave Platt

    Dean,

    It is a change from the basic stock color patterns. It will look good.

    Thanks for the info on the .003 aluminum.

    Boyd.

  15. #340

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    RE: T-28 Dave Platt

    Hey guys,
    Does anyone have a pix of the top wing surface showing the flap attached, i want to see if you guys extended the trailing wing sheeting over the flap


    Thanks
    Larry

  16. #341

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    RE: T-28 Dave Platt

    Larry, There is a 3/4 inch extension over the flaps. Taper the back edge after. The plans show the extension in the flap drive detail.

    Dean

  17. #342

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    RE: T-28 Dave Platt

    Dean,
    Thanks, I wonder if using G10 material for the over hang would be better to make a bit stronger?

  18. #343

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    RE: T-28 Dave Platt

    Larry, I fogot to make the sheet with the extension on the first T-28. I added a small triangle stock on the rear edge of the wing and used 3/32 sheet. After it was dry I sanded it down even with the rest of the wing.

    Dean

  19. #344

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    RE: T-28 Dave Platt

    Larry, Dean

    I did the same thing. I had to add the extension after the fact with triangle stock.

    Boyd.

  20. #345

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    RE: T-28 Dave Platt

    Hi guys,
    Started working on the landing light for the Trojan while I wait for 2 pro links to show up so I can finish the outboard flaps on the P38.
    Dean, I will be in Arizona the week of October 29th so I can raid the grand kids candy take from Halloween...heheheh
    Let me know if you free anytime that week and I'll see if I can schedule all my contractor appts around it. I was planning on PIMA for Tuesday the 30th or Thursday the 1st.
    Have to get the flap LE's cut so I can start working on them after I get the landing light done...

    Hope the flying has been good
    Larry

  21. #346
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    RE: T-28 Dave Platt

    Larry,

    I ran across this Trojan article from MAN somewhere on RCU and thought you might enjoy the sortie article while you are waiting for paint to cure and glue to dry. I always like the way they used to do the hobby stuff and add in a bit of history.

    Also, I am not sure if you can still get graveyard tours down across the street from PIMA Air Museum but if you are interested, look into it. I did that years ago and it was an incredible thing to go through. Enjoy PIMA at any rate. Great place.
    Attached Files Attached Files
    Tiger Flyer #49

  22. #347

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    RE: T-28 Dave Platt

    Larry,

    Do you have any pix's of your progress.

    I have not done anything with mine this summer. Hope to have it completed by x-mas.

    Boyd.

  23. #348

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    RE: T-28 Dave Platt

    Dean
    Thanks for the article, will take plaenty of pix of the Trojan when I go to PIMA, Boyd if you need anything in particular let me know and I'll photograph for you.
    Nothing on the Trojan, still working out the mechanics on the light, I'm using a landing light from Ram lighting that we had left over from the Avenger build and I'm trying to figure out what to do with the extra length.
    On a happier note the P-38 is within 1/2 hour of being ready to fly again
    Hope you guys have had some good flying weather.
    Tentative Avenger engine start and maybe test flight next Sunday, will let you know how that goes

    Larry

  24. #349
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    RE: T-28 Dave Platt

    Just as a side note....I think they had a sale of rivets when designing and building the T-28....
    # 93 in Club Saito; Carl Goldberg Ultimate Brotherhood # 12; Pulse brother # 2;Hellcat Brotherhood #8;P-47 Thunderbolt Brotherhood #18

  25. #350

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    RE: T-28 Dave Platt


    ORIGINAL:
    Let me know if you free anytime that week and I'll see if I can schedule all my contractor appts around it. I was planning on PIMA for Tuesday the 30th or Thursday the 1st.


    Hope the flying has been good
    Larry

    Larry, Let me know which day you intend to visit Pima. Weekdays are usually open for me.


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