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Oct 25, 2014, 01:01 PM
71% of the world is runway . .
Bart83's Avatar
Thread OP
New Product

79'' Grumman Goose , lasercut plan-free build amphibious airplane


The Grumman Goose kit is now in production by RC-Europe.eu
Here is a link to the website : Grumman Goose lasercut kit





Hello fellow model airplane builders and enthusiasts ,

Behind the screens i have been working on a new aircraft design. I was inspired by Zeke's Albatross and wanted to do something like that. The Grumman Goose is a long time favorite of mine so this was to be the next project.
The pictures of Warhead71 foam build goose in the catalina seaplanes livery really impressed me. Gary (GLM) also got excited as soon as i made the first 3d drawings so the decision was made to go ahead with it.

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Description: Goose ready for seatrials Name: Goose (433).jpg
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Description: All ready for some color

Some goals for the aircraft were :

- Large. (large aircraft simply fly better)

- Easy to transport and store

- No need for large motors and batteries

- Functional landing gear and flaps

- Build without plans.



With all that in mind i started the cad work. One of the biggest challenges was to design a retract system that could be home made. This took an enormous of time but eventually it got it done.

Links to a tutorial on how to make the landing gear parts :

Part 1
Part 2
Part 3
Part 4
Part 5


The Goose wingspan is 2 meters ( 79'') It is powered by two Turnigy G10 810kv motores running on a 3s6000mAh.
You need a 7 channel radio system. ( Elevator , Rudder , Ailerons , Flaps , L-Throttle , R-Throttle and Retracts).
The model feaures a split fuse for easy transport. The wing is in two parts.

In the next few posts im showing some of the building pictures.

Link to the webpage on Gary's website : http://morganmill.com/RC/Grumman_Goose.html




The Goose can now be flown in the Rc sim Aerofly RC-7 ! together with Arthur Schönknecht we got my 3d model to work in the sim. Here is link were the model is available as free download :

Grumman Goose for Aerofly RC7




Grumman Goose for Aerofly RC 7 (5 min 15 sec)




Some video's of my prototype in action :

Short Clip :

Grumman Goose , short clip (1 min 34 sec)




Maiden flight :

Maiden flight (3 min 52 sec)



Maiden from land

Grumman Goose , maiden from the beach. (5 min 4 sec)





2nd flight , windy conditions and rouch water this time:


RC Grumman Goose , 2nd flight (5 min 18 sec)





3rd flight , driving up the ramp at the end of the video.


Grumman Goose 3rd Flight (7 min 48 sec)



Sea-trials :

Sea trials (2 min 36 sec)





Retract design animation:

Gear animation (0 min 42 sec)




Landing gear test :

Gear test 3 (0 min 29 sec)




System test :

RC Grumman Goose systems test (1 min 42 sec)




Video's on Vimeo for those who have no acces to youtube :


(3 min 51 sec)


(5 min 17 sec)





Hope you all like my design ,

Cheers,

Bart




.
Last edited by Bart83; Nov 03, 2016 at 02:56 PM. Reason: added several links , pictures and re aranged the text.
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Oct 25, 2014, 01:02 PM
71% of the world is runway . .
Bart83's Avatar
Thread OP

The build starts . . . .


As mentioned in the previous post i shall start showing the build here. All the build photo's you are about to see are from my prototypebuild.
Prior to each series of build pictures i show the manual page refering to the build phase. The manual page show's the revised design. Also the the build sequense is shown as i have made it in the new manual. The protoype was build in another sequense so sometimes the pictures dont fully correnspond to the manual page.

Were gonna start with one of the difficult phases , the gear parts.

Cheers,

Bart
Last edited by Bart83; Oct 29, 2014 at 11:43 AM.
Oct 25, 2014, 01:24 PM
Balsa&Tissue
payne9999's Avatar
Very nice, I have been thinking about a retract mechanism for a friends Catalina.

From the last picture in your post I assume you have already maidened it. Does this mean you are close to releasing it?

Dave
Oct 25, 2014, 01:47 PM
Registered User
WOOOHOOO! Yeah Bart and Gary!! Waterproofing the retract bays will be a real trick. I guess I don't have to look for a winter project,
it's here just in time for Xmas!
Last edited by Fast Freddy; Oct 25, 2014 at 01:52 PM.
Oct 25, 2014, 02:01 PM
Fly2Build.com
scratchnhover's Avatar
Great! The more the merrier I always say.
Oct 25, 2014, 03:33 PM
71% of the world is runway . .
Bart83's Avatar
Thread OP
@ Dave , yes it has flown and it is released very soon [EDIT] ah what the heck the maiden video is now in the 1st post.

@ Fred , thanks ! does it fit under the tree ?

@ Fly2build : Thanks ! Your Goose is very beautifull too , looks very scale.

Cheers,

Bart
Last edited by Bart83; Oct 25, 2014 at 03:47 PM.
Oct 25, 2014, 03:47 PM
Registered User
Bart, Oh yes, this will definitely fit under the tree!

Before you get too far with this may I suggest an option for
retractable tip floats?
Last edited by Fast Freddy; Oct 25, 2014 at 04:07 PM.
Oct 25, 2014, 03:56 PM
71% of the world is runway . .
Bart83's Avatar
Thread OP
Edited post2 , build pictures start there now.

Bart
Oct 25, 2014, 04:03 PM
Slip the surly bonds...
Sopwith Mike's Avatar
Bart you are awesome...I raise my hat to you and Gary. That retract is so neat, and the planless build so clever. I wish I was a Goose fan!
Oct 25, 2014, 04:07 PM
71% of the world is runway . .
Bart83's Avatar
Thread OP
Thanks Mike ! it sure means alot coming from you. Goose in an RAF scheme then ?

Bart
Oct 25, 2014, 04:17 PM
71% of the world is runway . .
Bart83's Avatar
Thread OP
Retract video :

Gear test 3 (0 min 29 sec)


Cheers,

Bart
Oct 25, 2014, 04:32 PM
Res Ipsa Aviatur
Longhorne's Avatar
Nice work, Bart!

The gear assembly including the box is really nice.

Funny how much your bigger Goose sounds like mine. I get the same beat frequency. That's part of her character

Paul


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