Espritmodel.com Telemetry Radio
Reply
Thread Tools
Old Jan 16, 2012, 05:07 PM
Always Ready!
warhead_71's Avatar
Chicago, IL
Joined Dec 2006
5,099 Posts
Discussion
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.
warhead_71 is offline Find More Posts by warhead_71
Last edited by warhead_71; Jul 19, 2013 at 12:22 PM.
Reply With Quote
Sign up now
to remove ads between posts
Old Jan 16, 2012, 08:27 PM
The Hun in the Sun
vonJaerschky's Avatar
Canada, BC, Comox
Joined Nov 2003
7,217 Posts
I was wondering what happened to this Goose. Glad to see it coming to life again!
vonJaerschky is online now Find More Posts by vonJaerschky
Reply With Quote
Old Jan 16, 2012, 09:10 PM
Balsa and Foam can Coexist
WAGliderGuy's Avatar
United States, WA, Seattle
Joined Feb 2010
1,901 Posts
Sounds fun! There is a Goose that visits a lake near me often and the takeoffs sound great. Looking forward to more
WAGliderGuy is online now Find More Posts by WAGliderGuy
Reply With Quote
Old Jan 16, 2012, 09:42 PM
The "pro" in procrastination
Steve85's Avatar
Canada, ON, Kingston
Joined Mar 2004
2,644 Posts
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...

Steve
Steve85 is online now Find More Posts by Steve85
Reply With Quote
Old Jan 16, 2012, 09:44 PM
Always Ready!
warhead_71's Avatar
Chicago, IL
Joined Dec 2006
5,099 Posts
And after the Goose, I want to do the Duck someday....
warhead_71 is offline Find More Posts by warhead_71
Reply With Quote
Old Jan 16, 2012, 09:46 PM
G G Ghost Pirates !!!
Vyceroy's Avatar
USA, NC, Gastonia
Joined Dec 2001
8,823 Posts
Hey Warhead .. good to see you are picking this back up ..cant wait to see ya get started..
Vyceroy is offline Find More Posts by Vyceroy
Reply With Quote
Old Mar 06, 2012, 10:24 AM
Always Ready!
warhead_71's Avatar
Chicago, IL
Joined Dec 2006
5,099 Posts
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...
warhead_71 is offline Find More Posts by warhead_71
Reply With Quote
Old Mar 06, 2012, 10:30 AM
G G Ghost Pirates !!!
Vyceroy's Avatar
USA, NC, Gastonia
Joined Dec 2001
8,823 Posts
Quote:
Originally Posted by warhead_71 View Post
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
Vyceroy is offline Find More Posts by Vyceroy
Reply With Quote
Old Mar 06, 2012, 10:35 AM
Registered User
Canada
Joined Nov 2000
6,864 Posts
Don't be forgetting to build in operating wingtip drop down floats.. it's an important /defining feature..
Bare is offline Find More Posts by Bare
Reply With Quote
Old Mar 06, 2012, 10:51 AM
Always Ready!
warhead_71's Avatar
Chicago, IL
Joined Dec 2006
5,099 Posts
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.
warhead_71 is offline Find More Posts by warhead_71
Reply With Quote
Old Mar 06, 2012, 11:14 AM
G G Ghost Pirates !!!
Vyceroy's Avatar
USA, NC, Gastonia
Joined Dec 2001
8,823 Posts
i think the static floats are part of the older gooses charm .. if you get the retracts done i would love a set ..
Vyceroy is offline Find More Posts by Vyceroy
Reply With Quote
Old Mar 06, 2012, 11:34 AM
Always Ready!
warhead_71's Avatar
Chicago, IL
Joined Dec 2006
5,099 Posts
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.
warhead_71 is offline Find More Posts by warhead_71
Reply With Quote
Old Mar 06, 2012, 11:35 AM
G G Ghost Pirates !!!
Vyceroy's Avatar
USA, NC, Gastonia
Joined Dec 2001
8,823 Posts
meant the wheel retracts lol
Vyceroy is offline Find More Posts by Vyceroy
Reply With Quote
Old Mar 06, 2012, 03:15 PM
What's 3D?
trumps's Avatar
Australia, WA, Ellenbrook
Joined Feb 2008
3,316 Posts
Gotta love a goose! Looking forward to following your progress!

Craig
trumps is offline Find More Posts by trumps
Reply With Quote
Old Mar 06, 2012, 03:26 PM
I even seen a house fly!
LedKitty's Avatar
Montreal!
Joined Oct 2003
2,674 Posts
I'm very interested too!

Definitely subscribed!

Cheers,

Kitty
LedKitty is offline Find More Posts by LedKitty
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Question New possible kit - 1/16 scale Grumman Goose zbrubaker Waterplanes 65 Nov 04, 2012 03:35 PM
Question Sport scale parkflyer Grumman Goose zbrubaker Parkflyers 4 Apr 27, 2012 04:40 PM
Question Grumman Goose Retractable Landing Gear Pilatuspc12 Scale Kit/Scratch Built 15 Dec 22, 2011 11:22 PM
Discussion 52-inch Grumman "Cutter's Goose" greenseaships Foamies (Scratchbuilt) 15 Nov 26, 2011 01:46 AM
Discussion My first scratch build.. grumman goose?? flynfunny Foamies (Scratchbuilt) 12 Aug 08, 2011 02:23 PM