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Old Feb 14, 2011, 07:54 AM
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I have only ever used 3 and 6mm EPP as it's all I can get locally. My 20" NB and piYak are both built from 1.3# 6mm EPP.
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Old Feb 14, 2011, 08:07 AM
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Originally Posted by philipa_240sx View Post
I've been playing with rick.benjamin's drawing as per the DXF File. Just touched it up a bit:

- Rounded all edges so the the curves don't look like multi-sided polygon.
- Added the forward swept elevons (15 deg)
- Rounded the V-stab a bit so it integrates better into the fuse

I'll post the updated drawing as a PDF (tiled of course) once I finish.

Note: DXF can be made available but I am not sure how well the translation will work as I am not using AutoCAD.
DXF format is for document exchange between CAD programs. Thanks for the one you posted.

Rich
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Old Feb 14, 2011, 12:09 PM
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I've gone from the 1.3# to 1.9# as it's a bit stiffer and more dense. It takes less CF, glue and paint, so that makes up for the slight increase in weight. I use 4, 6 and 9mm, each used according to the size of the airframe.

Wonderful stuff, your foamies will last and last and last.............no matter how you abuse them. And, no waste, just save all the bits and glue them together into bigger pieces as invisible joints are possible.

Since EPP models last longer, the end cost is way less than other foams.
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Old Feb 14, 2011, 12:29 PM
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Originally Posted by goldguy View Post
I've ordered 100 sheets of EPP from rcskyflyer twice, had it mailed and it came right to my door, no duties and no taxes.
If I had 10 close friends all wanting EPP this would work. But for just a few sheets, it's prohibitively expensive to ship.

Thanks for the suggestion anyway goldguy!
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Old Feb 14, 2011, 02:13 PM
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Originally Posted by goldguy View Post
I've gone from the 1.3# to 1.9# as it's a bit stiffer and more dense. It takes less CF, glue and paint, so that makes up for the slight increase in weight. I use 4, 6 and 9mm, each used according to the size of the airframe.

Wonderful stuff, your foamies will last and last and last.............no matter how you abuse them. And, no waste, just save all the bits and glue them together into bigger pieces as invisible joints are possible.

Since EPP models last longer, the end cost is way less than other foams.
Thanks GG. I ordered my latest Superfly core out of the 1.3# epp and it doesn't take the abuse as well as the 1.9# Superfly does either. It's lighter, but not by much. I've still got 1.5 bundles of FFF left so I will still build and experiment with that first and when I find a "keeper", I will rebuild with epp.
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Old Feb 14, 2011, 03:38 PM
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FFF and lots of packing tape is the next best thing. It can really take a joke and when it starts to look sad from the wear and tear, just pour a kettle of boiling water over the blemishes and presto chango.......all will disappear like magic.
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Old Feb 14, 2011, 05:11 PM
I'm overcoming gravity!
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I'll have to remember the boiling water trick. I'm always in a hurry to get my new planes in the air and forget the packing tape part.
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Old Feb 14, 2011, 05:56 PM
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Also remember to do the boiling water before any gluing of the repair.

This was dollar tree foam I believe before I switched to the superior Hobby Lobby foam core when on sale.

Foam restoration with boiling water (2 min 58 sec)
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Old Feb 19, 2011, 06:05 PM
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OK, almost there.

Just playing with component placement to get the CG correct.

I've never tried credit card control horns before, but I thought they would be appropriate for this build. I used some Evergreen 0.040" styrene (thanks to the model railroad guys for this stuff) and created a 3" long horn that also acts as a reinforcement for the elevon. Slit the foam and glued in place. Pushrods are 0.060" CF rod with 0.032" wire ends.

I'll post pics later.
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Old Feb 19, 2011, 08:23 PM
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So just a rough calculation:

Airframe: 40g
Motor & prop: 25g
2S lipo: 38g
ESC: 10g with wires & connectors
Servo's: 20g (with wire)
Misc Hardware & pushrods: 15g

Projected AUW: 148g or 5.2oz
Projected wing loading: 2.94oz/sqft
Well, for a change I beat my own estimates!

The final AUW came in at 138g (4.87oz). No paint of course!

The wing loading works out to 2.75oz/sqft

I have to glue the motor mount still. Otherwise she is ready to fly!

Latest photo:
(Gens Ace 2S 450mAh in foreground)
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Old Feb 19, 2011, 10:53 PM
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Sounds like a winner to me..............
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Old Feb 20, 2011, 08:14 AM
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Sounds like a winner to me..............
Question is: Am I capable of flying it?

I have a lot of left thumb training to do!
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Old Feb 20, 2011, 10:26 AM
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Only one way to find out..............
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Old Feb 20, 2011, 11:33 AM
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goldguy,

Maiden went well. The little Infinite A1705 and 7x3.5 prop has more than enough power to hover. I'm very happy with the choice of motor for this plane. However the pilot needs a lot of practice! I managed a couple of hovers but that's all.

Thanks for the great design guys. Very responsive and fun plane. This will advance my flying skills and provide some much needed practice for my left thumb!
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Old Feb 20, 2011, 03:56 PM
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More photos:
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