Thread Tools
Dec 20, 2019, 02:11 PM
Registered User
Maiden today.
1500mm Motor Glider (2 min 31 sec)

1500mm motor glider (2 min 43 sec)
Last edited by boa2110; Dec 21, 2019 at 08:35 PM.
Sign up now
to remove ads between posts
Jan 06, 2020, 05:45 PM
Retired CAD guy
birdofplay's Avatar
I've completed my version of a 94" Fox Foamy.
It's my "On the Low Down" take of the FMS 3M Fox

It's cut from Model Plane Foam and built in the Foamy park flier philosophy.

Fuse is traditional Foamy style cruciform with Doubled layers Horizontal and vertical.
Wing is integrated and not removable.
It is 3 layers in KFM style.
I used a single CF spar spliced for double length and then I added some CF strips
Behind the Top side K step doing them as full span.
Packing tape colored and Clear on the Bottom of the wing.
The tail, even with double layered fuse parts was a bit flexible so I added some
some Balsa Triangle stock to stiffen it up somewhat.

I used 4ea 12 gm MG servos.
The surfaces are traditionally hinged at the rudder and elevator but the Ailerons are
Hinged with "Z" type hinges using BLENDERM tape.
There are a lot of inferior "surgical " tapes out there but Blenderm is the ONLY real choice.
"Z" hinges are real fussy to install but make a nice, sealed, gap surface.

Next thing is to add a folding prop and do some DECORATIONS.

Anyway I have uploaded a vid of the maiden and 2nd flights.

Fox foam 94" span (4 min 45 sec)


I can provide more details later if there is any interest.

Bob @ Hoosier Cutout Service
Last edited by birdofplay; Jan 06, 2020 at 06:15 PM.
Jan 06, 2020, 09:41 PM
Build more, websurf less
FlyingW's Avatar
Really nice Bob.

How did you laminate the layers of MPF foam?

It's the perfect size. What's the all up weight?


Jan 06, 2020, 10:00 PM
Retired CAD guy
birdofplay's Avatar
I'll have to do all that technical stuff and collect the specs tomorrow.

I use PU to laminate foam sheets which reacts with residual moisture.
Foam is air tight materiel so the surfaces are wiped with either water or drug store Isopropyl alcohol .
I suppose a misting would be ok too.
Then because it's white foam I use the white Gorilla Quick set which is ~ $5 / 2oz bottle.
If you don't care about color then regular gorilla PU is ok too.
It's doesn't have to be a thick messy coating. thin is good
I weight it all down on a flat surface and let the residual moisture do it's thing.

See pix.

As it is it feels heavy but it's also big so I haven't made my mind up yet.
I'll get the weight and squares up tomorrow.
Last edited by birdofplay; Jan 06, 2020 at 10:33 PM.
Jan 07, 2020, 07:37 AM
Foamy and Glider fanatic
Blacky's Boy's Avatar
Nice! Can you take the wings off?
Jan 07, 2020, 08:02 AM
Build more, websurf less
FlyingW's Avatar
Thanks Bob.

I successfully used the white gorilla glue to laminate layers on a Divinity wing.

I'm thinking about laminating two MPF layers to make a really big wing right now where each panel is about 20" chord by 48" span. I suppose I'll need to get the gorilla glue spread quickly and use a bunch of books to weigh it down on my basement floor - the only flat surface large enough that I've got handy.

What is PU?

Jan 07, 2020, 09:00 AM
Retired CAD guy
birdofplay's Avatar
PolyUrethane PU ! ;^}

That would be quite an interesting Aspect ration 20 x 96 !
Then again almost everything on the planet flys ...
Birds, bugs, Mammals, Marsupials kitchen sinks }}}}

You're gonna need a lot of a BIG Books !

From the layout you can discern that I embedded the Main CF spar between the 3 layers.
With the KFM layer being raised 6mm at "it's" Trailing edge ,
I decided to USE that exterior feature as an alignment aid when gluing on a 3 strips of CF,
all OVERLAPPING each other.
The intent is to provide added spar-like support.
Another stiffening trick is the addition of Tape or Low temp Covering.
There is a lot of strength to be had from that "skin".
Plus colored packing tape or Low temp coverings can be used to Decorate.

I'll run out to the shop a little later and get some specs and may some more Pix too.
Last edited by birdofplay; Jan 07, 2020 at 09:05 AM.
Jan 07, 2020, 09:38 PM
Retired CAD guy
birdofplay's Avatar
The wings are not removable as it currently is assembled.
You see how far I go from my shop to my runway.
transportation was never a consideration.
I suppose it could be modified fairly easily to make it easier to get to a club field.

I was surprised that it 's a whopping 2 lb 15 oz AUW
But, I can't imagine where I'd save much weight.
4ea 12 g MG servos
I have a 60 amp ESC on it but the current draw is only ~ 30 amps
I used a 2800ma 4s1p pak
and a Turnigy 3536/5 1450KV motor that was laying around.
I am thinking that a larger dia folding prop and a 3S pak might be more efficient.

Regardless it's not ever going to be a barn burner.
Likely it'll a stately, great flying , relaxing style late evening cruiser.
It'll never be a "soaring "machine unless I catch a Boomer thermal some summer afternoon.
Jan 11, 2020, 09:00 PM
Registered User
AirspeedNZ's Avatar

Slightly smaller version about four years ago

Hi Bob,

Your Fox is looking stunning!!
Attached (hopefully) is a pic of a version I built in a similar style almost four years ago! They fly brilliantly!

Jan 12, 2020, 09:08 AM
Retired CAD guy
birdofplay's Avatar
Thanks Dave.

I was in NZ almost a year ago now.
Great country.
Glad to finally got to visit and experience at least parts of it.

Slope soaring looks like a Year round possibility with those on shore winds
and great slopes.
Jan 12, 2020, 11:54 PM
Registered User
AirspeedNZ's Avatar
Absolutely year round here. And lovely calm evenings for a bit of thermalling or sport flying too! Really glad you enjoyed your visit. Come on back anytime, we're a welcoming bunch!
Jan 13, 2020, 08:33 AM
Retired CAD guy
birdofplay's Avatar
I SO wanted to get up to Whiteria slopes when docked in Wellington , but ...
it never happened. sighhhhh

The Hills around Akaroa also looked quite appealing and idylic for sloping as well.

Maybe next time around, eh ;>}
Jan 16, 2020, 10:30 PM
Retired CAD guy
birdofplay's Avatar
Just this note on the latest installment of my Giant 96" span Foamy Fox glider.
Enjoy ;>}

Fox foamy day 2 (4 min 27 sec)
Jan 16, 2020, 10:45 PM
JureZ's Avatar
Originally Posted by birdofplay
Just this note on the latest installment of my Giant 96" span Foamy Fox glider.
Enjoy ;>}

I did enjoy it, congrats !
Yesterday, 09:02 AM
jackerbes's Avatar
I did the wing for my Big Blu 96" wing in three sections for best transportability, that used fibreglas tubes anhd rods for joiners/spars and it worked out very nicely.


Quick Reply

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Show Us Your Easy Glider! Capgun_Slim Foamies (Kits) 231 Aug 03, 2014 02:07 AM
Show us your airplanes! sneu Electric Plane Talk 21 Sep 20, 2009 01:03 PM
go on show us your avatars mudlark Life, The Universe, and Politics 105 Dec 19, 2007 08:23 PM
Show us your wildest Zagi Dave Seay Foamies (Kits) 9 Jan 23, 2002 02:22 PM
Show us your choppers! sneu Electric Heli Talk 23 Dec 30, 2001 11:50 AM