BackPack FT 3D

by BackPackModels | April 15, 2014 | (11 Ratings) Posted in Projects

 

 

 

 

As the next step for your BackPack Spitfire, this is the BackPack FT 3D!

You always wanted to have a small 3D airplane with lots of power, medium size, capable to fly off a 3cell? Furthermore it should be easy to transport and small for storage, but you can´t get this on the market?

Here you can build or even convert your custom fitted FT 3D into a small model with removable wings, a carbon spar for reinforcement and wings that are as stiff or even better than the original ones with balsa. Have you got your foamboard ready to start up? …

As always, take your speedbuildkit or cut the parts yourself. Here in Germany I can´t get ´the real foamboard´and so I´ll be using depron in the following. Use some tape for your bendings and reinforce holes you´ve cut, that works great for me.

 

You can already start building the fuselage but do not cut the holes for the servos underneath the wings and leave out the front plate above your powerpod. That is going to make working on the plane much easier.

Now, take your wings and glue in the spars. Get a long drinking straw, a little wider than the carbon tubing you want to use. I found an 8mm straw and put a 6mm carbon spar into it.

Make some space in the middle of the spar and glue it in, than score it on the top so that it can crumble when you fold the wings.
 

 

Cut the balsa spar in half or take two of them to increase stability. Line it up with the fuselage-connection and glue it in.

 

 

 

Use a small drill to drill a hole in the center of the balsa spar. It´s easier to place the drinking-straw close to the leading edge and then make your connection.

 

 

 

Now, shift you wings into the fuselage and wide the cut holes if needed. If you did everything right, the wings should line up perfectly and be as well as parallel. Take some thick wire of your landing gear and bend it so it connects both holes perfectly. Give it a very little V-shape so that it pulls on both halves when you plug it in. Finally use a file to make the alignment of the wooden spars a little easier.

 

 

On the next picture, the power pod is already installed. I cut a small hole into its bottom to get access to the lock system. On the right I fastened a small piece of Velcro. With another piece on the left it secures the hook in its position.

 

 

 Finally place your servos underneath the wings and connect them to you receiver when you set up your plane.

 

 

And there you go! Now fasten the top motor plate and install your prop. I used colored tape for the decales and a ´standard´swappable landing gear. Whenever you want to store it in a small shelf or want to ride flying by bike, wings can be removed in only a few seconds. Enjoy!

 

 

 As always: Please rate, comment and share. I'd like to hear about your thoughts...

 

COMMENTS

sailorJohn on May 6, 2014
Cool!
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BackPackModels on May 7, 2014
Thanks!
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SteevyT on May 7, 2014
Wish I had seen this before building my FT3D, at least transporting it in a hatchback isn't bad, but being able to fold it like this would have been nice.
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BackPackModels on May 7, 2014
Thats what I thought about it. 32in wingspan is not much but nonetheless pretty unhandy during transport ;)
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OCD RC on May 6, 2014
This plane looks really great and strong. I liked your Backpack Spit too. Have you checked out Experimental Airlines folding wing, it's pretty nice. I did have one question,I was wondering what the little fins on the top and bottom of the wing do?
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BackPackModels on May 7, 2014
Thanks! I also love the Experimental Airlines folding wings but you need a flat bottom to attach the tape and this wing is symmetrical so I had to be creative...
The little fins are called Vortex Generators. They make the air more turbulent and so it sticks to the airfoil in high angles of attack (reduces wing-rock in harriers etc.).
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debs on May 9, 2014
Hi
g8 idea.
I have one doubt how to connect the two aileron servos to the receiver?
(I am new to RC)
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BackPackModels on May 9, 2014
Nice to see someone getting into the hobby ;)
For connecting the ailerons to the receiver u can use a Y-cable that splits up the signal and gives you two outputs or you can take a computer radio with a second programmable aileron channel. Then there is a little hole in the fuselage and in the Powerpod again to shift the cables through (or just leave the Y-cable hang out the sides, makes connecting easier)
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steelman on May 9, 2014
Try looking for a product named FOAM-X. I found it in Poland (4 € per 1000x700x5 mm sheet) in a shop selling stuff for stage designers. I saw it in some advertisement shops too.
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BackPackModels on May 9, 2014
Nice, the foam looks great! Just have to try ordering something below 100 sheets in one container. I´ll propably find some smaller shops later.
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mad_milchmann on May 12, 2014
Great! thanks mate, i was just thinking about building either the spitfire or the FT3D as a next plane.
I usually have to carry my planes in a backpack to the place I fly, so your articles make my life a lot easier. :)
I'm also from germany, I found some decent foamboard in an architecture-accesoories shop here in munich. we also started a thread on getting foamboard in germany in the FT Forums, maybe you could post the link to the polish shop there.
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BackPackModels on May 13, 2014
I´d recommend you the Spitfire. It ´flies´ better and can carry big batteries, landing gear and more. The FT 3D is nice to have some fun in the air but will never be as smooth and good-looking... Sure, I can post the sources for foamboard in the forum but I don´t quite get it - which polish shop do you mean? The foam-x thing or the depron? Nonetheless great to see that there are some more german Flitetesters out there ;)
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mad_milchmann on May 13, 2014
I meant the FOAM-X, but when i read the post more awake, I guess it is not a polish webshop. I already googled it, but found just shops that sell 24 sheets and more... thats a bit too much for me to try it out :)

thanks for the recommendation, I already had a tendency to the spitfire, but i guess now it's settled :)

I shrunk down the Baby Blender I'm currently building to 75% of the original size, so i guess I'll try that with the spitfire too, so i can reuse the powerpod and it should be even better to transport. But first I have to glue the last parts in place and spraypaint the BB.
and of course maiden it ;)

Where are you from in Germany? maybe we could meet and fly the FT planes together sometime... I'm from Munich btw.
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BackPackModels on May 13, 2014
Always exciting to do a maiden to a model!
I´m from Celle, close to Hanover and I've already thought about how great it would be to meet and fly with more Flitetest followers ;)
Munich is a little far away but maybe we can make it some day with some kind of german flitetest-member meetup without the FT-crew or so...
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mad_milchmann on May 14, 2014
yeah Celle is not around the corner...

German FT Meetup would be awesome... everone brings their FT Models and we throw a lot of foamboard in the air ;)
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mad_milchmann on May 14, 2014
Do you have any thought about how the FT Duster/Racer would work as a model with detachable wings? shouldn't be that hard to do except for the diheadral of the main wing, but should work quite similiar as with the sitfire...

the Duster (at leas t in the racer version without the big canopy) is the FT plane which looks I like the most. well the racer and the spitfire... i never can decide on that ;)
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BackPackModels on May 14, 2014
German Flitetest meetup with so many planes in the air would just be awesome!
FT Racer has got similar wings to the Spitfire, so same process here. It´s a little faster though, so you have to pay attention making everything stiff enough. The 'original' V-shapes are made by bent music wire or so and are fixed in a wooden centered-piece in one wing but that might be a little out of place in a plane like this.
Is there finally any way to send private messages, too? This thread is getting a little long and I´m close to being tired of translating ;D
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mad_milchmann on May 15, 2014
I don't think, that there's a PM function here... at least I didn't find it. but are you registered to the Forum also? If so jsut write me a PM there, I'm also mad_milchmann there.
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BackPackModels on May 15, 2014
Btw. check this out. It might help to grow the german-FT society ;D
https://maps.google.com/maps/ms?ie=UTF&msa=0&msid=206537710041372649195.0004e7d9393f716d5c0bf
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mad_milchmann on May 16, 2014
I'm just thinking about a really easy way of making wings detachable on the FT Duster. do you want to tell me what you think about it?
I started a thread in the Forum: http://forum.flitetest.com/showthread.php?9360-FT-Duster-with-detachable-wings&p=103890#post103890
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Flying Fox on November 19, 2014
AWESOME
This is soo cool

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Domtheturtle on November 28, 2014
Amazing article, I will definitely do this when I build my ft3d. Just one question, what is the velcro for, and how do you install it?
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BackPackModels on November 28, 2014
The wings are fastened inside the fuselage with a small metal hook. This hook has to stay inside the lock-system even in inverted flight. On that point, the Velcro locks its way out. Surely there is needed a second piece on the left side (not yet installed on the picture) of the joint. It will be glued in just the same way and seals the opening.
I hope that helps your build... ;)
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Domtheturtle on November 28, 2014
Okay, I understand it a little better now. But how does the velcro seal the opening? Does it just run over the hook? Or is there another way that it keeps it in? Again, I can't thank you enough for this article, it will make transport a lot easier for me.
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BackPackModels on November 29, 2014
Thank you! Improving great models is always nice but sharing new ideas is the best...
Your thoughts are right and yes, it just runs over the hook. If the hook's legs are bent long enough, it can't fall out anymore. Works great.
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Domtheturtle on November 29, 2014
Thanks I can't wait to start my build!
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