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Official Nexa 1870mm DHC-6 Twin Otter Canadian Yellow (Balsa ARF) Discussion Thread

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  • StiknRudder
    replied
    Originally posted by xviper View Post
    Before you get to that step, you should have the gear and wheels on so the plane can be more or less flat on the table and able to be held down securely (more or less level). The whole tail assembly should also be finished, perfectly square and aligned properly so the template can do it's job.
    That template should only go over the main wing dowel (aluminum) and the horizontal stabilizer. It has nothing to do with either positioning dowel. The front of the template goes over the aluminum tube and the rear slat goes over the horizontal stab. Look at page 10C. The whole "jig" assembly is so you can ensure that A=A'. If one side is more than the other, that means your tail assembly is crooked and not aligned with the fuselage. It does not really set the incidence of the of the horizontal stab. You may need to prop bits and pieces of the plane with stacks of little boxes, books or sheets of something so you can measure precisely A and A'. You might even need 4 hands. (It's like looking through the crosshairs of a rifle scope at another set of cross hairs marked on a wall. You want both crosshairs to match and sit one over the other. This template helps you ensure that your "rifle" is perfectly aligned up/down, left/right.)

    I'm using 9.5 X 7 X 3 props (counter-rotating) from the Flightline OV-10 / B-24 and HobbyKing Aerostar 850KV motors and 80A ESCs (overkill) because I just happen to have these laying around from other cancelled projects. I fly on 4S and the TO has plenty of get up and go. If you want more punch, go with what you have in mind but double check to make sure the 11" props won't hit the fuselage when turning. If you can't use the 11" prop, stick with the power 25 as it has 100KV more speed unless you go with a pitchier prop on the 32 if the 11" is too big.

    My ESCs are mounted inside the engine nacelles with multiple slits dremeled at front and rear cowel for more airflow to keep them cool. Not that big of a deal if you want to mount the ESCs inside the plane but you must ensure airflow so they don't get too hot in the summer. I kept them in the nacelles since the room is there for them.
    Thank you very much. The directions are, shall we say, lacking.

    Leave a comment:


  • xviper
    replied
    Originally posted by StiknRudder View Post
    Hello fellow Twotter lovers,

    I'm building this kit and I have a few questions. What in the world does that cardboard incidence gauge, that only lines up with the wing spar and one of the positioning dowels, even though there are 3 holes, supposed to do? I've set the horizontal stab perpendicular with the vertical stab and now I need to glue it. Does it measure squareness with the fuse? Does it actually set the incidence of the horizontal stab when you glue in the vertical stab?

    Secondly, Power system. Looking at either e-flite power 25 870KV with 10x7x3 MAS or Power 32 with 11x7x3. Either with 60a Avian ESCs.

    Third, has anybody put the ESCs in the fuse and run long power leads or just put the ESC under the nacelles and run longer battery leads?

    Thanks in advance for any help.
    Before you get to that step, you should have the gear and wheels on so the plane can be more or less flat on the table and able to be held down securely (more or less level). The whole tail assembly should also be finished, perfectly square and aligned properly so the template can do it's job.
    That template should only go over the main wing dowel (aluminum) and the horizontal stabilizer. It has nothing to do with either positioning dowel. The front of the template goes over the aluminum tube and the rear slat goes over the horizontal stab. Look at page 10C. The whole "jig" assembly is so you can ensure that A=A'. If one side is more than the other, that means your tail assembly is crooked and not aligned with the fuselage. It does not really set the incidence of the of the horizontal stab. You may need to prop bits and pieces of the plane with stacks of little boxes, books or sheets of something so you can measure precisely A and A'. You might even need 4 hands. (It's like looking through the crosshairs of a rifle scope at another set of cross hairs marked on a wall. You want both crosshairs to match and sit one over the other. This template helps you ensure that your "rifle" is perfectly aligned up/down, left/right.)

    I'm using 9.5 X 7 X 3 props (counter-rotating) from the Flightline OV-10 / B-24 and HobbyKing Aerostar 850KV motors and 80A ESCs (overkill) because I just happen to have these laying around from other cancelled projects. I fly on 4S and the TO has plenty of get up and go. If you want more punch, go with what you have in mind but double check to make sure the 11" props won't hit the fuselage when turning. If you can't use the 11" prop, stick with the power 25 as it has 100KV more speed unless you go with a pitchier prop on the 32 if the 11" is too big.

    My ESCs are mounted inside the engine nacelles with multiple slits dremeled at front and rear cowel for more airflow to keep them cool. Not that big of a deal if you want to mount the ESCs inside the plane but you must ensure airflow so they don't get too hot in the summer. I kept them in the nacelles since the room is there for them.

    Leave a comment:


  • StiknRudder
    replied
    Hello fellow Twotter lovers,

    I'm building this kit and I have a few questions. What in the world does that cardboard incidence gauge, that only lines up with the wing spar and one of the positioning dowels, even though there are 3 holes, supposed to do? I've set the horizontal stab perpendicular with the vertical stab and now I need to glue it. Does it measure squareness with the fuse? Does it actually set the incidence of the horizontal stab when you glue in the vertical stab?

    Secondly, Power system. Looking at either e-flite power 25 870KV with 10x7x3 MAS or Power 32 with 11x7x3. Either with 60a Avian ESCs.

    Third, has anybody put the ESCs in the fuse and run long power leads or just put the ESC under the nacelles and run longer battery leads?

    Thanks in advance for any help.

    Leave a comment:


  • xviper
    replied
    Perfect!

    Leave a comment:


  • arkreal1
    replied
    Just to let you know xviper, I took out seat bracket ( the one has magnet attached to it ) and secured the seat in slots with few drop of CA. Now I can push my two batteries side by side all the way forward with ease and get the CG right. Also added two pilots I had in my toy box.

    Leave a comment:


  • arkreal1
    replied
    Will do. Thanks!

    Leave a comment:


  • xviper
    replied
    Originally posted by arkreal1 View Post
    Thanks again! Will try to move batteries little more forward see i can get a way with just adding little weight. Do not want to change the whole power system now.
    I wouldn't change a thing at this point. See if you can tuck one battery under the seat as far forward as it can go and maybe consider putting the second one in a transverse config to get as much of your batteries weight forward.
    This plane tends to be quite forgiving of a slightly altered CG. It's already quite big and heavy. A little tail heavy is manageable.

    Leave a comment:


  • arkreal1
    replied
    Thanks again! Will try to move batteries little more forward see i can get a way with just adding little weight. Do not want to change the whole power system now.

    Leave a comment:


  • xviper
    replied
    Originally posted by arkreal1 View Post
    Thanks for the info! So you are connecting each esc to 4s 3000 ?
    Yes, that is correct. I've had the Hanger 9 Twin Otter before and on 4s, it was just barely enough for my flying style. This one is a bit smaller and lighter, so I figured that 4s would be just perfect and it turned out it is indeed the case. I have no idea what it would be like on 3s, but I'm sure it'll be fine. I just like to fly my planes with a bit more gusto. Scale flying is fine, but I get a bit bored unless I can do loops and rolls with ease.
    I based my powertrain on the similarly sized and weighted HobbyKing Albatross seaplane. It's using the same 4s system from that plane.

    Leave a comment:


  • arkreal1
    replied
    I got recommended esc and motors from motion rc and they recommend 3s 5000 battery. That is why i went with 3s battery which i already have.

    Leave a comment:


  • arkreal1
    replied
    Thanks for the info! So you are connecting each esc to 4s 3000 ?

    Leave a comment:


  • xviper
    replied
    Originally posted by arkreal1 View Post
    I am using two 3s 2600 admiral battery in parallel which gives me 5200 mah all the way behind the pilot seat. Still appears way too tail heavy. Is anybody adding weight in front to get the cg right at 60mm? thanks for comment!
    You probably are tail heavy. I built mine as a 4 cell plane, using 2 x 3000mah, 4s Graphenes, each weighing 400g. This first battery is tucked under the pilots' seat about 1/2 way. The other sits on top of the first with its front end touching the back of the seat. This balances my TO perfectly and it flies very nicely.
    Your twin 3s Admirals weigh about 1/2 of what mine weigh, so I'm not surprised that it's tail heavy. If I didn't tuck one of the batteries under the seat, it would not balance. You should either add weight (undesireable) or get bigger batteries that will balance it properly. Add more smaller batteries till it balances. Then weigh it all to find out how big of batteries you really need. I'm not saying you need 800g of batteries since yours is built as a 3 cell and your motors and ESCs may be much lighter than those I use in mine. You may need less or you may need more.

    Leave a comment:


  • arkreal1
    replied
    I am using two 3s 2600 admiral battery in parallel which gives me 5200 mah all the way behind the pilot seat. Still appears way too tail heavy. Is anybody adding weight in front to get the cg right at 60mm? thanks for comment!

    Leave a comment:


  • xviper
    replied
    I don't understand exactly what it is that isn't "working well" and what setting screw you are talking about. Perhaps a picture would have helped. In any case, hope the new part will fix it for you.

    Leave a comment:


  • long-love-rc
    replied
    Originally posted by long-love-rc View Post
    So unfortunate, the setting screw of the nose gear of my twin otter, seems no longer working well. It may have some damaged threads, or there is some damaged thread in the control arm. Either way, it couldn't properly steer the nose wheel.

    Is there any other way to fix this? I am relucant to buy the whole hardware set for 44 dollars on motiontc.com.

    There are some Du-Bro steerable landing gear on sale, like this one: https://www.motionrc.com/products/du...se-gear-dub152. I ain't sure if it fits the twin otter though.

    Any advice will be highly appreciated, thank you.
    Seems Du-Bro 152 is close matching it. I ordered one set. Hopefully it will work.


    Leave a comment:


  • long-love-rc
    replied
    So unfortunate, the setting screw of the nose gear of my twin otter, seems no longer working well. It may have some damaged threads, or there is some damaged thread in the control arm. Either way, it couldn't properly steer the nose wheel.

    Is there any other way to fix this? I am relucant to buy the whole hardware set for 44 dollars on motiontc.com.

    There are some Du-Bro steerable landing gear on sale, like this one: https://www.motionrc.com/products/du...se-gear-dub152. I ain't sure if it fits the twin otter though.

    Any advice will be highly appreciated, thank you.

    Leave a comment:


  • long-love-rc
    replied
    Originally posted by xviper View Post
    No, I would not use Loctite. Foamtac or any contact type airplane glue is plenty good. Loctite can create other problems if it gets near anything plastic. When the motor spins, Loctite can get thrown to places you never know. Foam glue never actually dries hard so it can facilitate easy removal.
    Wow, good knowledge! thanks a lot for letting me know.

    Leave a comment:


  • xviper
    replied
    Originally posted by long-love-rc View Post
    Sure, will try! thanks a lot, maybe loctite will do too.
    No, I would not use Loctite. Foamtac or any contact type airplane glue is plenty good. Loctite can create other problems if it gets near anything plastic. When the motor spins, Loctite can get thrown to places you never know. Foam glue never actually dries hard so it can facilitate easy removal.

    Leave a comment:


  • long-love-rc
    replied
    Originally posted by xviper View Post
    No, you do NOT need a reverse threaded prop shaft and nut. You simply put the regular nut on but dab some FoamTac on the threads where the nut comes to rest, tighten as usual.
    Sure, will try! thanks a lot, maybe loctite will do too.

    Leave a comment:


  • xviper
    replied
    Originally posted by long-love-rc View Post

    xviper , thank you for sharing. So I also ordered a ccw propeller last night. Then, painfully I realized that I need ccw screw and nut to install it. Otherwise, it will automatically manage to turn loose. But where to order that kind of screw and nut throws me into the dark...
    No, you do NOT need a reverse threaded prop shaft and nut. You simply put the regular nut on but dab some FoamTac on the threads where the nut comes to rest, tighten as usual.

    Leave a comment:

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