G'day everyone,
Several years ago I discovered this plan as I was trying to learn to fly, it became my first Depron foam plane, and now I have built several of these for friends and family and it has never disappointed as a trainer.
When I saw the Phlatprinter this was the first plane that I thought of.This is also the first plane that I have had a go at designing with SketchUp for the Phlatprinter. It was originally designed by Scotta and here are the build threads:
Part 1 http://www.rcgroups.com/forums/showthre ... ge=1&pp=15
Part 2 http://www.rcgroups.com/forums/showthre ... ge=1&pp=15
Part 3 http://www.rcgroups.com/forums/showthread.php?t=291173

I intend to purchase a MK this year and I am working on about 6 other designs including a 100” PBY, a 100” Mosquito, and a 100” B-36.
I hope you enjoy this design and I have also attached the original plans and some pic's of the EO CUBS that I have built.

Enjoy,
Matt

Attached files EO CUB.skp (3.5 MB)Â b_Park_Trainer.pdf (1.3 MB)Â

 

Wow! Very nice! This would go over big with my club members. I will have to cut one out for sure.

Thanks for sharing!

 

Thanks for the advice E-T, I’m still a novice at designing these and any input from everyone would be great.
I did modify the original plans to fix all the issues that I had when I built them with alignment and adding more tabbing for ease of build. The nose piece (motor mount) is meant to be 3mm Ply and everything else is 6mm foam.
The cowl for me is the hardest part and I am still working on designing it in sketchup properly, I'm also looking to upscale it to about 150% adding in some simple wing ribs and carbon fibre rod for the spar.
Not having my phlatpriter to practice these cuts either is a bit of a problem too, as I am still to see the result of what I have done with the PhlatScript.

Flash – Good luck if you go ahead and build one, I'd love to see more of these out there and trust me, it will not disappoint. Talking to a guy last weekend who I built one for about 2 years ago, and he still fly’s it!!!

Thanks guys and happy flying,

Matt

Just thort you would like to see what i'm upto with some teaser photos..



Attached files

 

Matt, you do like them big (100"), do you? I'm curious to see how your going to design them using foam, or are you not going to make them out of foam?

 

All my designs are going to be 6mm foam, skinned with 3mm using some 3mm PLY for spars and some frame work..

 

I have been making some minor adjustments to the SKP file. I Found one part was missing that was shown in the template pictures. I rearranged everything to fit on one sheet of FFF. It is tight, but when cut with a 1/16" bit, everything has plenty of room.

I have made 2 sheets of test cuts and want to make one more just to be sure everything is correct and then I will post my file here. Probably later tomorrow afternoon.

Matt, if you will PM me with your address, I will send you a set of cutout parts since you don't yet have a Phlatprinter.

I have a new Phlatformer, still in the box waiting to be built, that I hope to use to make a cowl for this plane. That would be killer!

 

Thanks Flash but living in Australia might cause a bit of an issue with postage But thank you for the offer, it's very much appreciated.
I want to learn to make 3D parts too.. And with this new machine I can foresee so many possibilities.
I'm sorry that I missed some parts too as I am still learning and I will have a look again and correct it, I can't wait to see your corrections too as any input is great in my learning stage.

Happy Flying and Cutting,
Matt

 

Flash, Are you going to post the modified files?

David

 

Thanks Mark and Trish, I'm putting my order in for the MK next week as I finally have the funds. By the time it gets here it should make for a good Xmas present.
Matt

 

Yep, Sorry for the delay. I have been testing the new controller board using this cut file. Time sort of got away from me.

This version is on a single sheet of FFF. The CNC file is made for a 1/16" bit with a cut speed of 80 ipm.

I added fold lines to the wings and one missing part. Enjoy.

Attached files EO CUB.skp (4.1 MB)Â EO cub.cnc (112 KB)Â

 

Sweet, looks alot better, and the rear bulkhead looks heaps better that what I tryed to do for the control rod's. How did you make the rounded edge rectangle? Your layout look great too. Thanks for fixing that all up.

I'm using SU8 now and I hope that the PhlatScript is fixed for it as there is no colored lines for the any of the cut's.. But I get the idea of where it all go's..

Matt

 

I just finished my phlatformer, this will be a good project to test it out.

 

I just starting gluing it together. I found a few places that need some touch up. Nothing that would prevent it from getting built, but there are few tabs that need to be a little longer and the opening for the rear bulkhead is so close to the slots that there is little foam left for support.

Rev 2 is attached with those changes. Still not finished building. Some of the parts fit a bit tight, but the foam compresses enough to allow them to mate.

Got a couple parts in there that I don't know where they go... Attached files EO CUB Rev 2.skp (4.1 MB)Â EO cub rev2.cnc (113 KB)Â

 

Awkkk! I finally got to the point of being able to put the side fuse in place and discovered the rear bulkhead needs tabs to fit into the fuse!

Here is a quick fix for the rear bulkhead. Rather than release another version, this is just a single part to replace the one in Rev 2. Attached files EO CUB Rev 21 Rear Bulkhead Fix.skp (3.4 MB)Â

 

I am going to have to put this one aside for awhile. After starting to build this plane, I have found there are quite a few things that need to be addressed still.

Some of the parts do not align correctly. There are a couple parts that seem to go nowhere, yet other parts seem to be missing altogether.

I am sure It is salvagable, but I really don't have the time to devote to it right now.

If someone wants to tackle it, here are areas I think still need to be addressed...

The fuse side pieces do not extend the nose section far enough to completely wrap the cowl area. The two pieces are about a half an inch too short to meet in the middle when wrapped over the cowl.

The firewall appears to be about a quarter inch or so too short.

There does not appear to be a hatch cover for the battery.

Openings in the top plate are for what purpose?

I am not sure where or how the windscreen is or would mount.

I think the ESC needs to be mounted before you glue on the right fuse side. It will be impossible to replace the speed controller without cutting into the plane later on.

I am not sure how the wings are supposed to attach. It appears that an attempt was made to put a wing support up front with dihedral built in, but the wing is not wide enough to actually reach it.

I have not read thru the build threads on RCgroups, maybe the answers are there, but I usually just wade in and improvise if I need to and it looks like maybe some reading would be in order this time, but I just don't have the time right now, with another plane in the process of being built, a couple others awaiting to be cut out for friends, a phlatformer still in the box and preparing for a Phlatprinter not to mention a new set of floats sitting on my bench awaiting installation... ahhh life is just too short. I need more hours in the day.

 

Flashsolutions, I've placed my request for longer days also, but didn't want to be greedy, so I've asked that Friday, Saturday and Sunday all be made 30 hour days. The rest of the week can stay unchanged. :mrgreen:
Now, how's that for self-restraint? :roll:

 

I will try to answer some of these questions:

The fuse side pieces do not extend the nose section far enough to completely wrap the cowl area. The two pieces are about a half an inch too short to meet in the middle when wrapped over the cowl.
I had the same problem with the original and I was hoping that Sketchup would help with this problem.

There does not appear to be a hatch cover for the battery.
The holes on either side are for Velcro to hold the battery in.

Openings in the top plate are for what purpose?
To pass the battery leads through

I am not sure where or how the windscreen is or would mount.
This was a puzzle for me to and I found that it just holds onto either side of the cockpit

I think the ESC needs to be mounted before you glue on the right fuse side. It will be impossible to replace the speed controller without cutting into the plane later on.
You are right. And I forgot to add in the air vents that I wanted to for this version
I am not sure how the wings are supposed to attach. It appears that an attempt was made to put a wing support up front with dihedral built in, but the wing is not wide enough to actually reach it.
The wing is made up of 6mm carbon fibre rod running in the grove on the LE and TE. I used some Aluminium tube to make the same dihedral then glued it all together. Then I used skewers’ for the tie down points for the rubber bands to hold to, there is no hole which I had forgotten too.

I should have done a quick build log/manual to go with it and I might make one up later to help.

Matt

 

Thanks for that... That clears up some of the mystery.

I made a few more tweaks to the SU file, moved some parts around and extended a couple to better fit over the curved surfaces.

The fuse cowl cover may be just a tad longer than needed now, but you can easily sand or trim it down. I figure it is better to be little oversized than not having enough material to quite reach.

Same for the wing.... made it about a quarter inch wider to account for some foam thickness variation.

I also made the wing into a single piece which you can cut down the middle after you have folded the curvature into it. This lets you be able to put a long ruler or flat board over the full width of the wing and place your bends evenly across the whole wing.

I ran a test cut and found one part still needing a bit more tweaking, so this version has not been cut out as yet, although I am pretty confident that it will be okay.

I also added holes in the fuse for the landing gear wire to pass thru, but did not add any holes for the bamboo skewers used to mount the wing. I figure those can just be punched thru when you get to that point in the build.

Attached files EO CUB Rev 3.skp (4.1 MB)Â

 

Finally got some time to start going thru the build thread. See I need to put back one of the pieces I took out which is a spline for the cowl... no bigee, it is so small, it could fit anywhere. It is in the original SU file and I see a couple parts that could use some cutouts for the 10mm motor shaft, but that is easy enough to cut out with an xacto blade.

I see EWO has already built this little guy back in 2004 and was posting to the RCgroups thread.

Anyway, I got the rev 3 parts cut out and dry fit everything... looks good. Took it apart and applied Aileens Tacky glue to the main fuse structure and clamped it up to dry.

I think this is going to make a very nice trainer. We get new members in our club frequently and this could be a very good plane to introduce them to the sport. I have been looking for something along these lines that is easy to build and sturdy enough for rough landings.

This plane fits the bill. The cowl is probably the hardest part to make(you will need templates from the build thread).

Thanks again to Pezzer2003, our Australian Phlatforum member for bringing this one to our attention.

 

The cowl was the hardest part to build and in the last version that I built, I didn't even attempt to make it as it is normally destroyed...

I noticed that the cut in the aft former for the landing gear is being done on the wrong side, as it is sandwiched between the two forward formers. And the wire should pop out between the edges of the foam. So you will have to flip it for the cut.

I’m still working on the cowl in 3D, is there any way to take it from Sketch Up to gcode for the cutting? or will I need another program to assist with this?
Matt

 

This is area I have not delved into much but I think there is a plugin to export to an STL file and from there, create the gcode for cutting a block of foam into a mold for the Phlatformer. At least I think that is the process.

I figured this would be a good project to learn how to do this since I have a new Phlatformer still in the box waiting to be built.