Yak-55 3D Dollar Tree foam board build

[cjhagemeyer]

so the first one i built had a 48.5in wingspan, and weighed 760g. But for that i only took the paper off of one side of the foam and used hot glue to glue it together and on top of that used an arrow shaft as a spar which is about 30g, and then all of my electronics. for the new one im building im using a balsa spar which is about 6g and taking ALL the paper off, and not using hot glue to glue the pieces together. my goal is to get it around 600g auw. which is lighter than this one which is a comparable size

Skynetic Yak 54 3D 1100mm (43.3") Wingspan - ARF BUNDLE [SKY1012-002] Motion RC

Yak 54 3D 1100mm (43.3") Wingspan - ARF BUNDLE from Skynetic - SKY1012-002 The Skynetic Yak 54 EPP is a 3D flyer made of durable EPP foam that can perform show-stopping 3D maneuvers with ease. The Yak 54 EPP has been structurally-enhanced with carbon fiber support rods and strips throughout for...

www.motionrc.com

 

[Incader]

Carbon tubing/struts should make light work of both issues, right??

 

[Goose 51]

If I'm using 1 layer of paperless dtfb instead of two, can I still use an FT f pack? Is it under 200 grams?

 

[Tench745]

If I'm using 1 layer of paperless dtfb instead of two, can I still use an FT f pack? Is it under 200 grams?

Can't speak to the plane specifically, but if I remember correctly, the paper is about half the weight of DTFB. If you remove the paper and double the foam it will weigh the same. (Plus the weight of the extra glue.)

 

[Goose 51]

Can't speak to the plane specifically, but if I remember correctly, the paper is about half the weight of DTFB. If you remove the paper and double the foam it will weigh the same. (Plus the weight of the extra glue.)

Sweet, I didn't know that, thanks for the tip

 

[Tench745]

Sweet, I didn't know that, thanks for the tip

For whatever it's worth, Dollar Tree posterboard weighs about the same as DTFB with the paper removed from one side.

 

[Jo's squadron]

 

[Jo's squadron]

I ended up on this video by accident, thought I'd share.

 

[AIRFORGE]

Nice! Adam's Readi-Board for the win!

 

[Zokyy]

First a little back story. I thought flying a 3D airplane was way beyond my abilities. I'm a slow-fly and glider type of pilot. A couple of weeks ago one of the guys at the RC field has a EPP foamy profile 3D Extra. He's no 3D pilot either. He tells me I have to fly his new airplane. I think he's out of his mind. I'll destroy it. So I fly it anyway. I was amazed at how easy it was to fly. So slow and floaty. It wasn't twitchy at all. It felt slow and smooth. I was doing my short repertoire of stunts with ease. A tight loop looks like a backflip. It rolls like a drill. Flying two mistakes high is only 30 feet up. I gotta have one!

I searched for plans and find one of the most popular and most copied 3D out there is Leadfeather's Yak-55. Plans galore. 32" wingspan; downloaded it. For the first time ever I make templates from the plans. I know for sure I will be making more than one. The retail foamy I flew was made from 9mm EPP foam. I don't have any EPP but I have lots of Adams foam board from Dollar Tree. When you peel off the paper and glue two sheets together you have 10mm sheet foam. Close enough.

Here's the first shot at making a 3D airplane.

View attachment 144775

Two sheets of DTFB, no paper, glued together with spray adhesive.

View attachment 144722

Templates arranged on one sheet of foam. The other half of the wing goes on a second sheet.

View attachment 144723

These are all the parts cut out. I don't think I've made an airplane with this few number of pieces. If you had a big enough sheet of foam it could be even less parts by combining the horizontal parts before cutting it out.

View attachment 144724

It's late so I'll continue the build thread later. Stay tuned...
<edit> Plans and build instructions attached.
Jon

Guys tell me that which paper format should i need to print in the shop A0 or A1 sheets ??

 

[heckerp1]

Hey guys,
I was thinking of building this with XPS insufoam. What thickness should I go for?
As for the electronics, I have a 1800kv 2204 24g motor, 12A esc, 8040 propeller(CCW), fs2A receiver, one 3.7g servo and one 1.8g servo with 2S 650mah 45C lipo. Will this be alright to fly?
Also if someone could please answer @Zokyy 's question (I was wondering the same 🥲)

 

[Proptastic]

Hey guys,
I was thinking of building this with XPS insufoam. What thickness should I go for?
As for the electronics, I have a 1800kv 2204 24g motor, 12A esc, 8040 propeller(CCW), fs2A receiver, one 3.7g servo and one 1.8g servo with 2S 650mah 45C lipo. Will this be alright to fly?
Also if someone could please answer @Zokyy 's question (I was wondering the same 🥲)

The thinnest stuff you can get is fanfold. It's about 1/4" thick. It's a lot lighter, softer and more brittle than DTFB, so will most definitely need reinforcement bedded into it. Your airframe will be extremely lightweight and 2S power should be just fine.

 

[heckerp1]

The thinnest stuff you can get is fanfold. It's about 1/4" thick. It's a lot lighter, softer and more brittle than DTFB, so will most definitely need reinforcement bedded into it. Your airframe will be extremely lightweight and 2S power should be just fine.

fanfold? I had thought of using some xps insulation foam (blue) which are sold in blocks of 25mm or 30mm, by cutting them into 6mm sheets.
Also I am thinking of building the 22'' version, will this be alright?

 

[heckerp1]

Guys tell me that which paper format should i need to print in the shop A0 or A1 sheets ??

I found the 22 inch yak 55 to be A2 size

 

[Proptastic]

fanfold? I had thought of using some xps insulation foam (blue) which are sold in blocks of 25mm or 30mm, by cutting them into 6mm sheets.
Also I am thinking of building the 22'' version, will this be alright?

Fanfold is xps. Around here it comes in 4' x 8' sheets of different thicknesses, and fanfold. But yes you can cut thick ones into thinner ones. The stuff I used is also blue. I never did use it much. I had a mini F22 that disintegrated when crashed on a vineyard wire. I still have a mini Mustang and a Viggen that's built from it.

 

[heckerp1]

Fanfold is xps. Around here it comes in 4' x 8' sheets of different thicknesses, and fanfold. But yes you can cut thick ones into thinner ones. The stuff I used is also blue. I never did use it much. I had a mini F22 that disintegrated when crashed on a vineyard wire. I still have a mini Mustang and a Viggen that's built from it.

Oh really? I havent worked with DTFB before (not available in my region at all) so I didn't know. But I was planning on adding Carbon spar reinforcements. It should work with that, right?
Also I am confused on what thickness I should keep. 3mm? 5mm? 6mm? or go all out with 9mm (expecting about 250g max thrust with motor on conservative side)?
Also should I tape all surfaces to prevent it breaking during crash?

 

[Proptastic]

Oh really? I havent worked with DTFB before (not available in my region at all) so I didn't know. But I was planning on adding Carbon spar reinforcements. It should work with that, right?
Also I am confused on what thickness I should keep. 3mm? 5mm? 6mm? or go all out with 9mm (expecting about 250g max thrust with motor on conservative side)?

I like carbon the most.

6mm, or 1/4" thickness is usually the standard. You could go as thin as 3mm on something like a micro build. You would use thicker than 6mm for something like a monster scale build.
I have an incomplete 200% Bushwacker made of 1/2" and 3/4" xps, with aluminum reinforcement.
For a 22" Yak, stay around 6mm or your wing will be thick and chunky.

 

[heckerp1]

I like carbon the most.

6mm, or 1/4" thickness is usually the standard. You could go as thin as 3mm on something like a micro build. You would use thicker than 6mm for something like a monster scale build.
I have an incomplete 200% Bushwacker made of 1/2" and 3/4" xps, with aluminum reinforcement.
For a 22" Yak, stay around 6mm or your wing will be thick and chunky.

Alright, so 6mm is the go to size. Also should I consider taping the surface?

 

[Proptastic]

Alright, so 6mm is the go to size. Also should I consider taping the surface?

You could. It would add a little more rigidity and damage resistance.

 

[The Hangar]

Fanfold is xps. Around here it comes in 4' x 8' sheets of different thicknesses, and fanfold. But yes you can cut thick ones into thinner ones. The stuff I used is also blue. I never did use it much. I had a mini F22 that disintegrated when crashed on a vineyard wire. I still have a mini Mustang and a Viggen that's built from it.

Is your Viggen the hotwire version ft made?