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Thread: Twin Trainer


  1. #1

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    Twin Trainer

    Twin Trainer (TTII)

    I decided to purchase a set of plans from Model Airplane News back in 2004 for a Twin Aircraft. This aircraft was designed by Roy Day. I started building right away and then shelved it to build a couple of kits. I started and stopped a couple times over the last year and am now ready to paint....
    Used Koverall...Not sure on the colour scheme yet....

    Spec's:
    Type..........Twin Engine Sport
    WS............72"
    Length.......45"
    Weight.......6Ibs
    Engines......2 - .25 O.S. FA 2-stroke


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    Joe
    Remember: If you can\'\'t reach it; it\'\'s too high!

  2. #2
    siddus74's Avatar
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    RE: Twin Trainer

    Joe,

    Nice job, looking good. I thought I was the only one that ever bought these plans :-) . . . I to have started and stopped mine several times now also. Been building a Junior 60 and a twin Catalina water plane but have just started to get back to my TT2 . . .

    I pondered on the whole twin tail setup but could not see a suitable 'non slop' way to do the linkage on a plane this size so opted for a single rudder but of the same area.

    I wanted mine to serve as a trainer for a twins, but have since aquired a couple of pre-assmbled jobbies and have found there is no mystery or diffulties with twins, but that the secret lies in good solid plumbing and treating an engine out as a dead stick.

    I never thought of painting mine TT2, you must post some pitures when you have sprayed it. With what type of piant and method are you going to use? Did you glass the center section and the nacels as suggested by the plans?

    Below are a couple of pics and a link to my club site . . .

    My TT2 Build . . .



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    siddus74

    http://www.leenvalleymodelflyingclub.co.uk

  3. #3

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    RE: Twin Trainer

    siddus74,

    Really nice work on that Twin!!

    I checked out your building progress on your club site...Nice...

    I did reinforce the wing and nacels with fiberglass. I plan on using Latex paint and sealing with polyurethan...
    Thinking of a "Beatup Look" Like an old courier plane........

    Keep up the good work....Would like to see more progress pic's..........

    Joe





    Joe
    Remember: If you can\'\'t reach it; it\'\'s too high!

  4. #4
    siddus74's Avatar
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    RE: Twin Trainer

    Latex paint, is that from a spay can or gun? What make of pint would that be - I never seen to ba able to get a good finish with paint. Do you have a scheme in mind - if so I would be interested to see it. I am goin british army with mine, green with the ww2 aviation stripes may like my cub . . . How did you do the nose cone, i but it was a real job to cover that in film :-) im dreading mine. Im not sure to use pink foam or balsa layers . . . maybe a close up of yours would be good.


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    siddus74

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  5. #5

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    RE: Twin Trainer

    siddus74,

    Latex paint, is that from a spay can or gun?
    I will be using flat latex paint (Behr). I mix it with windshield washer fluid until I get it to a Milky consistancy. Apply with a spray gun.
    I set the air pressure to @ 40 psi....practice spraying onto a piece of glass....should go on "powder like"....
    Use a primer first...light coat....fill in any "bad spots with light filler...sand and touch up with primer.....
    I will post some pics..........
    For the nose I picked up a 6" square block of foam from a craft store.....I then rough cut to shape and then final sand as per the nose cone profile on the drawing...I then cut a piece of 1/8 lite ply to fit on the back of the nose cone and glue in place...after the glue has set drill a 1/4" hole into the centre of the lite ply @ at centre...Then insert a 1/4" dowel through the back plate @ 21/2" into the foam....Now you have what looks like an ice cream cone....(taste good but it's soo bad for you!!)
    Clamp the 1/4" dowel into a table vise....Then using 3/4oz fibreglass cut into 11/2" x 6" strips....epoxy to nose cone.....
    Once everything has dried fill in any bad spots and sand....Cut the 1/4" dowel off flush with the back plate and glue onto fuse...

    I will use the same method for the engine cowls....I will make one (1) plug...and cover with a plastic wrap...then epoxy fibreglass
    ...the plastic protects the plug and will be able to use for the other nacelle....

    Hope this helps.........




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    Joe
    Remember: If you can\'\'t reach it; it\'\'s too high!

  6. #6
    siddus74's Avatar
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    RE: Twin Trainer

    Joe,

    Thanks for the heads up. BTW have you sheeted the sides and the top of the fus? It looks like it on the photo of the nose cone . . . I cant recal at the mo, does the plan say to sheet it all?
    siddus74

    http://www.leenvalleymodelflyingclub.co.uk

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    RE: Twin Trainer

    siddus74,

    I did sheet the fuse...just past the TE of the wing.....

    Joe
    Remember: If you can\'\'t reach it; it\'\'s too high!

  8. #8
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    RE: Twin Trainer

    Joe,

    Knowing there is another bod out there building the same plan as me has given me a knew spurt of enthusiam . . . I have cracked on and built the nacels now and have constructed the servo mounts now as well. Have done any more to yours?

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    siddus74

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    RE: Twin Trainer

    siddus74,

    WOW...Nice work on the nacelles and nose on your Twin......
    I'm looking forward to seeing this airplane coming to completion......Keep up the good work....

    I finished preparing the Koverall for paint....My plan is to prime this week and start painting soon after.....
    I will post pics after the primer.........



    Joe
    Remember: If you can\'\'t reach it; it\'\'s too high!

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    RE: Twin Trainer

    Here are a couple of pics of the painted fuse as she sits right now

    The fuse is flat black & the rudders are (orange) chilli pepper red

    I plan on painting the wings (orange) with black highlights....

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    Joe
    Remember: If you can\'\'t reach it; it\'\'s too high!

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    RE: Twin Trainer

    It's a good idea to build twin-trainer first!
    I am in progress with Royal Beech Baron, but now flying a trainer built from single-engined trainer.
    I just made a new wing for it... Looks pretty ugly, but flies great!
    Powered by 2 Magnum .61 4-strokes, 1800mm wing span (70.8 inches)
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  12. #12

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    RE: Twin Trainer

    Wherewolf,

    A trainer is the way to go....gets you onto that learning curve....
    It doesn't have to look pretty to fly well.....[)]....

    Good luck with the Royal Beech Baron....
    Joe
    Remember: If you can\'\'t reach it; it\'\'s too high!

  13. #13
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    RE: Twin Trainer

    It doesn't have to look pretty to fly well.
    Cannot argue with that! - John.
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    RE: Twin Trainer

    Trickypig and Siddus74: Was I supprised to see this thread. I just started building a Twin Trainse after haveing the plans for 4 years or so! I thought I was probably the only one interested in this bird! I have the wing complete to date. I'm going to power it with 2 electrics...Do you have any pictures of the tail feathers, specifically the horizontal stab and elevator. I haven't quite figured that out yet. On the drawings it looks like the ribs taper to the TE much thinner than the elevator...any close ups would be great. Did you build the rudder and tail wheel steering as shown on the plans? I'm also trying a new techneque for me at least. The ribs outside of the motors afe 3mm foam then capstriped...seems just as rigid as the balsa ribs...

    Thanks,
    Murphey (as in Murphey's Law)

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    RE: Twin Trainer

    Boomerang 1,

    I think that multi you have there is well done...very inventive nacelle's.......

    What do you have pulling that bad boy around?

    [8D]
    Joe
    Remember: If you can\'\'t reach it; it\'\'s too high!

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    RE: Twin Trainer

    Murphey,

    I will take a couple pics tonite of the tail and linkage for the tail wheel and rudders.....
    Siddus74 did a great job with one rudder assembly....
    I am in the process of making a mould for the cowls....hopefully this bird will fly soon.....
    Joe
    Remember: If you can\'\'t reach it; it\'\'s too high!

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    RE: Twin Trainer

    Boomerang1 great plane!!!!! what engines installed there?
    how close are RPM on outer ones? As per my twin difference for 200-300 rpm
    is OK. But as for 4-engines.... outer produce at least 3 times greater moment, then
    the inner ones. And did you any tests for one outer engine-off?

  18. #18

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    RE: Twin Trainer

    A pic or two of the tail feathers...showing the bellcrank linkage for the rudders and tail wheel
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    Joe
    Remember: If you can\'\'t reach it; it\'\'s too high!

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    RE: Twin Trainer

    Thanks Joe! I've finished the wing and started on the horizontal stab. Since I'm going electric, I've modified the nacells to fit cowls that I have on hand. A bit narrower but pretty close to the original.

    I see there are a few errors in the stab drawings so I'm dong a bit of a design build. I see it gets a bit crowded inside that hatch! I'll post a few pictures of my progress next week...won't get back in the shop till then...unfortunately...

    How close are you to launch?

    Murphey

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    RE: Twin Trainer

    Murphey,

    I am very close to a maiden....unfortunetly, work & life are taking the front seat right now [:'(]
    I have made a mould for the cowls and need to go over the airplane with one more "dusting" of paint....
    Mount the engines - balance the plane and she is ready for air.....

    The compartment for the rudder and tail wheel linkage is tight but managable...I hate to put a hatch in but I think
    it's a necessary evil [:@]
    I plan on making a vid of the first flight....[8D]

    Looking forward to seeing some progress pic

    Joe
    Remember: If you can\'\'t reach it; it\'\'s too high!

  21. #21
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    RE: Twin Trainer

    Sorry guys, have not visited this thread for a little while. The plane is an American Sterling Gazariator. A friend originally flew it with an OS 60 & gave it to me. I was building a scale model & this was the test bed. It has two OS FP 40's & two old OS RC 20 engines outboard. It had heaps of flights & engine RPM sync was not needed, just tuned them all to run smoothly. It was so reliable in the end I was just wearing the engines out. The (rare) engine stoppages caused no problems but at idle it glided like an anvil.

    This is a very old pic, my little daughter in the pic is now 21 & not so little any more. The model I eventually built, a B-29 Superfortress, is now about 16 years old & just about worn out. With the advances in electric power I now build my multi's a different way. - John.
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  22. #22
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    RE: Twin Trainer

    Trickey,

    Sorry I have too have been away from this thread for a while, the twin trainer will now get restarted . . . Have you maidened yours yet, I just wanted to say hats off for for the job on the twin rudder controls - great work there. What is the AUW of yours? What engines did you use?, did you run with the .25's? I am going to try a pair of .15's first as I think this plane will be so over powred with .25's . . .

    Murphy,

    Good that your building one - do you have any pictures to share yet? How have you found the plan, some of the measurements between plan and side vies on the drawings differed quite considerably so have a quick measure first.

    I still have the love of twins and have recently found a love for water planes so I have been building a couple of them - there both finished now so I shall try and crack on with the twin trainer now !




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    siddus74

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  23. #23

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    RE: Twin Trainer

    siddus74!!

    Nice looking twin aircraft
    Thanks for the comments on the twin rudder controls. I haven't had a chance to maiden her yet. The os 25's are run in....they will provide alot of power.....

    Looking forward to seeing some pics of the finished product

    Joe
    Remember: If you can\'\'t reach it; it\'\'s too high!

  24. #24
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    RE: Twin Trainer

    Tricky, Just wondering if you have done anymore to your twin trainer of late? How close to the maiden are you now? I have managed to do a couple of hours on mine this week to try and bring me closer to the finish line I have glassed the wings in the center now (I used the wing skinning cloth and rollered it on with wing skinning expoy - nice and fluid stuff no lumps) I have also done the horrible stuff like rib capping and radio install with the control rods. I hope mine still flys ok considering I have only the single rudder and the extra weight of the cargo door / unit. I have ensured that I have roughly the same rudder and control area as the plan with regards the single rudder to give me a fighting chance . . . I am still unsure if this bird requires .25's over .15's . . .

    now for the big covering job, I think I am going to use solartex to finish mine, I like your idea of the cargo plane - I may try and go for a british army cargo plane look or something similar . . .

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    siddus74

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    RE: Twin Trainer

    Siddus 74,

    Sorry for being away from this link for so long.....I work in construction (plumber) and get really busy during the summer...[:'(]
    You are doing a great job on that TTII....very jealous on the workmanship......[8D]
    I notice you have used servos for each aileron....I went with the single central aileron w/bellcranks.....wish I had thought it through..
    I would consider staying with the 25's for power......
    I will post pics this weekend..........

    Keep up the good work
    Joe
    Remember: If you can\'\'t reach it; it\'\'s too high!


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