Funbuild 5: 59" foam Grumman Goose - RC Groups
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Jan 16, 2012, 06:07 PM
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warhead_71's Avatar

Funbuild 5: 59" foam Grumman Goose

**** Getting her balanced and trimmed ****
Foamie 59" RC Grumman Goose : Flight 4 (0 min 0 sec)

Foamie 59" RC Grumman Goose : Flight 3 (5 min 34 sec)

Foamie 59" RC Grumman Goose (4 min 9 sec)

**** Build montage and maiden flight, June 30, 2012 ****
Foamie 59" RC Grumman Goose (4 min 55 sec)

**** Taxi test and an accidental hop, June 23, 2012 ****
Grumman Goose taxi test (5 min 27 sec)

**** Float test, June 22, 2012 ****
Foamie 59" RC Grumman Goose : float test (0 min 0 sec)

**** Electronics Installed, April 16, 2012 ****
RC foamie Grumman Goose (1 min 42 sec)

**** One year later: Brown County Forest Preserve, Indiana. April 19, 2013 ****
Grumman Goose (1 min 47 sec)


I drew this up almost 2 years ago but home remodeling and kids put it on the back burner. I guess this is the perfect excuse to start building it.

I'm going to go with the 1/10th scale size, wingspan 58.8" and length 47.4". Made from 1/2" pink foam and 1/4" FFF. I might deviate from the plans here and there as I want to try a few different methods for building up wings and covering the foam.

Power will be from 2 DAT750 motors turning 11x6x3 props on 3S 2200mah-3300mah. Should make about 35oz of thrust each or 70oz total. This is my first twin, but I want to try differential steering for water taxiing.

581.4squin wing area
64oz AUW (estimated)
Max CL 1.17 (NACA 23015)
Wing Loading 15.85oz/sf
Cubic Loading 7.89oz/cuft (between "trainer" and "sport")
Stall Speed 18.2mph

*** edit ***
Actual AUW is between 74-77oz depending on battery, but it obviously has no problems at this weight as I can ROW at 2/3 throttle and maintain a level cruise at 1/2 throttle.
Last edited by warhead_71; Sep 25, 2015 at 09:37 AM.
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Jan 16, 2012, 09:27 PM
Registered User
vonJaerschky's Avatar
I was wondering what happened to this Goose. Glad to see it coming to life again!
Jan 16, 2012, 10:10 PM
Airliner Builder
WAGliderGuy's Avatar
Sounds fun! There is a Goose that visits a lake near me often and the takeoffs sound great. Looking forward to more
Jan 16, 2012, 10:42 PM
The "pro" in procrastination
Steve85's Avatar
Hey Warren,

I'm really looking forward to seeing how you tackle this one.

Funny thing, flying boats and amphibs never really did it for me, but as I've watched a couple come together here on RCGroups, I'm warming to them. The Goose definitely has the cool factor going for it...

Jan 16, 2012, 10:44 PM
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warhead_71's Avatar
And after the Goose, I want to do the Duck someday....
Jan 16, 2012, 10:46 PM
G G Ghost Pirates !!!
Vyceroy's Avatar
Hey Warhead .. good to see you are picking this back up ..cant wait to see ya get started..
Mar 06, 2012, 11:24 AM
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warhead_71's Avatar
Finally got started on it last night. I made really good progress in about 3 hours work. I have the fuselage box completely built and just need to add the V-bottom triangles and hull sheeting. Everything went together pretty well except I needed to do some light trimming/sanding and a little heating to pull the nose together. This 1/2" foam doesn't bend very easily so I had to "convince" it. A small deviation from my plans is that I built the wing saddle area up as part of the fuselage box and will hotwire out the wing saddle afterwards so I have a perfect fit. Next step will be to carve the nose-block from a single large chunk of foam, then build the cockpit/canopy. Couldn't be happier how easily this is going together. I'll post some pics tonight.

P.S. - this thing is HUGE! I could easily fit the neighbor's cat inside...
Mar 06, 2012, 11:30 AM
G G Ghost Pirates !!!
Vyceroy's Avatar
Originally Posted by warhead_71
P.S. - this thing is HUGE! I could easily fit the neighbor's cat inside...
Now there's a good idea if i ever heard one
Mar 06, 2012, 11:35 AM
Registered User
Don't be forgetting to build in operating wingtip drop down floats.. it's an important /defining feature..
Mar 06, 2012, 11:51 AM
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warhead_71's Avatar
I have not decided whether I want to do the retracting floats or static floats yet... I guess it depends on which paint scheme I choose and what is appropriate for that era. I definitely won't be doing the retracting wheels "yet". I just want to make sure it flies before I go through all the trouble.
Mar 06, 2012, 12:14 PM
G G Ghost Pirates !!!
Vyceroy's Avatar
i think the static floats are part of the older gooses charm .. if you get the retracts done i would love a set ..
Mar 06, 2012, 12:34 PM
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warhead_71's Avatar
Float retracts would be very easy just using a pair of mini retracts. Servo-less retracts would make the job even easier. Wheel retracts are definitely do-able... just more complicated than I want to spend time on before I find out if the plane even flies well. If the maiden is good, I can easily retrofit wheel retracts... though the retractable tailwheel might be hard to get to without opening up the turtle deck. I plan to fly this off water most of the time though, so I can't justify the added weight, servo load, and complication other than just as a technical challenge. So maybe after the maiden... if all goes well.
Mar 06, 2012, 12:35 PM
G G Ghost Pirates !!!
Vyceroy's Avatar
meant the wheel retracts lol
Mar 06, 2012, 04:15 PM
What's 3D?
trumps's Avatar
Gotta love a goose! Looking forward to following your progress!

Mar 06, 2012, 04:26 PM
I even seen a house fly!
LedKitty's Avatar
I'm very interested too!

Definitely subscribed!



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