The BEST XUAF Foamy EDF Custom Build - RC Groups
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Jun 20, 2012, 10:06 PM
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The BEST XUAF Foamy EDF Custom Build

Are you sick of getting hassled about having a foamy aircraft?

Sick of it breaking?

Want a cool looking jet which no one has?........

I thought I would give it a go and see if I can answer all these questions. I like the fact that RC aircraft is actually unmanned, so why not start off with calling this RC custom jet a XUAF - Extreme Unmanned Aircraft Fighter.

Where to start? Well first, lets look at "cool" timeless aircraft, the BAE Hawk and F4 Phantom

Now what will happen if I do a sketch to see what a merge of these will look like...

This is where I am so far.
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Jun 21, 2012, 12:13 AM
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XUAF Line drawing

Here is what I am thinking in a line drawing. I don't have a CAD program, but use indesign or illustrator to draw up some quick 2D concepts for hotwire cutting the fuse
Jun 21, 2012, 05:14 AM
was geht , müssen unten kommen
Keenan smith's Avatar
i could Draw this in cad for you in my spare time....
Jun 21, 2012, 06:20 AM
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i could Draw this in cad for you in my spare time....
WOW! Now that's the first time I have ever heard that! Amazing! CAD experts are a rare breed, and for someone to offer is out of this world! Most people freak as an aircraft has so many curves - not just straight lines.

Sure, stay tunned as what I will do is finish this build and see how she preforms, then we will have a platform/prototype model to work from. This will help iron ot any design flaws as allot of this build will use the "eye-ometer"

Jun 21, 2012, 06:43 AM
was geht , müssen unten kommen
Keenan smith's Avatar
Okey doke im watching and waiting
Jun 22, 2012, 04:38 AM
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Printed out the 2D drawings and using a hot wire was able to cut out the profile of the aircraft.

I am using EPP which is more softer, and can take the knocks better than EPS which is used for most EDF Jets.

The block I am using is 100mm thick, this will make up the entire fuse (excluding the intakes).
Jun 22, 2012, 06:00 AM
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Using the plan view of the 2D print out I am able to cut out the intakes of the XUAF.

I then mark out the center line before I round the edges as it makes it hard to find an edge otherwise. It looks real box like, but once rounded off it will look much better.
Jun 22, 2012, 09:12 AM
was geht , müssen unten kommen
Keenan smith's Avatar
Looking Good!
Jun 23, 2012, 03:25 AM
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DUCTING and Shaping the EDF

Well now comes the fun part - Ducting and shaping.

Since I am working from a solid block and not a factory molded EPS model, I have to cut the aircraft in half so I can do the ducting.

You can see the plan view of the aircraft on an earlier post, this is what I will use for the positioning and layout.

I use a custom bent hotwire tool - I do top half, then bottom half - two halves make a hole

I get the basic shape, then I slowly open up the intakes - they will look too small, yes, but I open them up. I start smaller and slowly work my way up so that the EDF when placed inside does not slop round.

Once the shape has been done, I round the edges of the XUAF aircraft.....
Jun 23, 2012, 12:32 PM
kelberts's Avatar
Looks great, but why does it need a canopy?
Jun 23, 2012, 05:01 PM
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Originally Posted by kelberts
Looks great, but why does it need a canopy?
Just to get the shape - this build will also show how you can use every day materials to make an EDF Aircraft look like a glass one.

I will cover the whole thing in plastic from Soda bottles

I need the canopy as I will wrap the shape then dicard the EPP inner when I am done....

Stay tuned
Jun 24, 2012, 11:48 PM
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Now is the time where the build gets a little over the show as I will be doing multiple things on this build at one time.

This build will go through and ugly season, so bare with me as the end result will transform the aircraft.

You will see some paint on the XUAF, what I do is give it a mist over with a coat of spray paint and sand it lightly back - like in cars this will show me where it is uneven.

Also I am not too fussed on the finish as you will see I am covering the aircraft with carbon poly, this will give extreme strength and a fiber glass look to this "foamy"

I Do a quick install of the EDF to make sure everything lines up. I am using a RC Lander EDF unit - great power from a small EDF...

The set up will be 4s 2200mAh Lipo, 80A ESC, 68mm All Alloy EDF with 1.7kgs of thrust.
Jun 24, 2012, 11:50 PM
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XUAF Tail Section

This simply uses 3mm coreflute cut out which allows the tail section to be strong and NEVER break.

I run 3mm carbon rods through the coreflute to add strength to stop any "flutter" at high speed.
Jun 25, 2012, 02:04 AM
was geht , müssen unten kommen
Keenan smith's Avatar
Nice BTW lemme know When you need the Cad Drawings Done...
Jun 25, 2012, 03:35 AM
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Originally Posted by k.smith459
Nice BTW lemme know When you need the Cad Drawings Done...
Can you do them so that on a CNC machine it could make a male mould - as in with curves etc?... A full 3D model (if that makes sense).

A mate done this for me for one of my other planes (Ridge Racer), but it was done in a 3D program and could not be read by a CNC operating system/program.

They can only read things like step files, DXF - no cinema 3D (which does not export to that), Rhino is another program which was mentioned I have never heard befor, but too expensive (plus I don't have the know how).

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