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New Plans!! 1/5th Grumman Goose G.21A - 11/23/2011 7:25 AM   
yamaharley


 

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Hi everyone,

If you're interested in scratch building a Grumman Goose, then follow this thread! There will be updates!

I've been working on new plans for a 1/5th and 1/6th scale G.21A Goose for a short while now from Grumman's sectional drawings

Once the plans are completed, the model will be built and  inspected by a qualified giant model inspector, test flown, and  I'll let you all know when I upload the youtube vids. Then the plans will be available once it's actually passed as 'flyable and sound'

I'm designing the Goose as a rather simple quick build model so any relatively experienced modeller won't get a headache trying to build one. (As you don't score any extra competition points for construction complexity, you do score more points for scratch building!

It's all balsa and ply, so you'll have to do your own waterproofing if you want to use it as a true ampibian!! However it does have provision for retracts, or you can fill in the holes with dummy wheels as a permanent "water plane", so build it however you intend to use it!  All modellers will prefer to set their model up their 'own way' so after some feedback I received a while back, you'll have the option to finish it however you want with regards to landing gear / waterproofing !

I'm trying to keep the model as strong and light as possible but I'll have the cowls metal spun on the lathe now. The wings will dissassemble for easy transportation (one reason why I didn't go 1/4 scale at the moment because of my car size!)

I've uploaded a sneak preview of some 3D photos of the fuselage half completed! Take a squizz and let me know if you're interested!



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< Message edited by yamaharley -- 11/26/2011 5:28 AM >

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RE: New Plans!! 1/5th Grumman Goose G.21A - 11/23/2011 6:58 PM   
Crash-RCU


 

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Status: offline 		How about some specs, wingspan, est. weight, power system planned, ect. looking forward to your progress.

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RE: New Plans!! 1/5th Grumman Goose G.21A - 11/23/2011 11:51 PM   
yamaharley


 

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Status: offline 		At 1/5 th scale I am completing CAD drawings for a plan. As soon as it's ready I'll have it available from 1/6th -and eventually 1/4 scale also.

@ 1/5th scale dimensions:                        @ 1/4 scale dimensions:                     @ 1/6th scale dimensions:    

Wing span: 117.6"                                         Wing span: 147"                                    Wing span: 98"
Length: 89.5"
Height: 19.8"
Width: 12.8"
Cowl diameter: 9.6"
Cowl depth: 4.6"

I'll be either  laser or cnc milling short  kits in the future after successful flight tests are complete.

Prototype 1/5th scale G.21 Goose will be powered by two 7 cylinder Seidel radial four strokes @ 70cc each with a 22" prop.
 



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RE: New Plans!! 1/5th Grumman Goose G.21A - 11/23/2011 11:59 PM   
lever02


 

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RE: New Plans!! 1/5th Grumman Goose G.21A - 11/24/2011 12:09 AM   
goirish



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RE: New Plans!! 1/5th Grumman Goose G.21A - 11/24/2011 2:23 PM   
yamaharley


 

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Status: offline 		Thanks for your interest!

I've added some more pictures to the original post. Nearly finished the tedious job of applying the stringers to the fuselage!

The wing and tail is the easiest part for me!

I've contacted a metal spinner company. Looks like it's cheap enough to spin metal on a lathe and make the engine cowlings that way!

A little birdy told me that Robart already makes retracts for this aircraft type??  I've seen some people go to the trouble of making their own (which I may well do if I can't acquire any) but if you can just readily buy them off the shelf that's even easier! I've checked out their website but can't seem to find them? 

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RE: New Plans!! 1/5th Grumman Goose G.21A - 11/26/2011 2:22 AM   
Avaiojet


 

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Status: offline 		yamaharley,

Does your CAD program allow for you to wind up with vector line art of the plans? For the benefit of having a kit laser cut?

If yes, it doesn't matter what size you build your model, because it takes nothing to reduce the size once the plans are in vectored format. You could offer cut kits at any size.

If all you'll wind up with is plans, I can honestly tell you, it's too big.

Sure, there'll be interest but not much. Couple of people will build the model, if that.

Gear? Robart won't even talk to you for a model that size. The gear they have now, that retract similar to the Goose, is the F4F. Very different, not even close. My guess is there's none available anyway.

You could offer a smaller model. A comfortable size that everyone can agree with. Many can enjoy it this way. Otherwise, it's you and only a couple of others.

Best advice I can give.

Charles



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RE: New Plans!! 1/5th Grumman Goose G.21A - 11/26/2011 4:18 AM   
Wayne22



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Status: offline 		Good project. I will be following this with a great deal of interest, although for practical purposes, my needs would be met with a more modest size of 1/6th or even 1/7th scale.

Lets get that prototype flying!!!!

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RE: New Plans!! 1/5th Grumman Goose G.21A - 11/26/2011 5:20 AM   
yamaharley


 

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Status: offline 		Indeed, very true Avaiojet & Wayne22. Yes the plans can be altered to any size at all to  have the digital file exported for kit cutting.

If it's smaller you want, that's easy!  However for the prototype my only reason for  building the 1/5th version is to make use of both 7 cylinder radials.

I was initially inspired by a certain Beechcraft D-18 plan @ 147" span, and yet always wanting a Goose, I decided to base this one on a similar scale and thought it might attract some interest, but a smaller model is even easier!

You're right about the retracts! I'll custom Tig weld my own in the workshop, but I'll use ready made oleo struts at the correct length and go from there and make up brackets.

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RE: New Plans!! 1/5th Grumman Goose G.21A - 11/26/2011 3:04 PM   
Avaiojet


 

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quote:

Yes the plans can be altered to any size at all to have the digital file exported for kit cutting.


yamaharley,

I know of no digital program or file that can be exported as a vector line?

Sure, I have a program that takes bitmap art and turns it into vectored line art. But it does this poorly as does all programs that do this.

You must draw your plans in vectored format. Or you will have to have someone do a trace of each part to enable the part to be cut by laser.

I offer this service. Certainly, once the plan or parts are drawn, size isn't an issue, that's quick.

Radial engines are usually heavy for the power output. This model will sit in the water. Engine choice should be based on the absence of weight for power and not good looks.

Charles





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RE: New Plans!! 1/5th Grumman Goose G.21A - 11/26/2011 8:19 PM   
yamaharley


 

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Status: offline 		Sounds great!  My plans are coming along great so far!

The plans can be altered to any scale   Thanks but I won't need to outsource any labour and I'll be painting my own graphics 

Radial engines do look great & are heavyt! Yes you're right! I've taken the weight vs volume displacement into consideration already :P

Ever seen the 4 engined Goose? It was a G-21C powered by 4 P&W  PT6A's. It sat so deep in the water with only 50% fuel and  only 4 passengers that the passenger entrance hatch sat 3" below the water line haha. The aircraft wasn't endorsed by Grumman and was just an expensive experiment.
If that was a real aircraft, the model at 1/5th scale won't sit anywhere near as deep in the H2O with radials :O



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RE: New Plans!! 1/5th Grumman Goose G.21A - 12/9/2011 4:25 PM   
jhbanks10


 

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Status: offline 		yamaharley, sounds like you've got a good project going! I'm interested in the 1/5 version as it seems to be good fit for the ASP FS-400 radial engines, one of which just happens to be sitting under our Christmas tree as we speak . Thanks for the good work and I'll be watching the thread.

Hal

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RE: New Plans!! 1/5th Grumman Goose G.21A - 12/10/2011 12:32 AM   
Thomas B


 

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quote:

ORIGINAL: Avaiojet

yamaharley,


Gear? Robart won't even talk to you for a model that size. The gear they have now, that retract similar to the Goose, is the F4F. Very different, not even close. My guess is there's none available anyway.

........

Charles




Robart used to make 1/4 scale Widgeon gear...pretty close to the Goose. There was a 1/4 scale G&P widgeon kit that Robart had gear for, plus another giant scale Wideon that was kitted here in North Texas.

I am certain that Century Jet or Sierra Precision could custom make gear for any size Goose, for a price.

Nothing wrong with offering the plans at any size he desires. Remember, for every model built from a set of plans, at least 10-100 sets of plans gets sold to those who dream about building it. I have about 100 plans myself that I might never get around to building.... I agree that he should offer it in a more rational size, as well...but the nice thing about CAD is that doing so becomes a pretty simple scaling exercise, plus some new considerations for sizes of structural materials.

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RE: New Plans!! 1/5th Grumman Goose G.21A - 12/30/2011 3:40 AM   
yamaharley


 

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Status: offline 		Thanks for all the private emails !

I took a holiday break over the christmas period, and in the new year sometime  I'll start uploading photos of the fuselage construction phase.

She truly is turning into a tubby model! If she eats too much wood, I'll have to put her on a diet !

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RE: New Plans!! 1/5th Grumman Goose G.21A - 9/3/2012 2:05 AM   
Coyote1990


 

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Good day,

Is this thread still active?
Has anyone heard of the progress on that 1/5 goose?
Thx

al



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RE: New Plans!! 1/5th Grumman Goose G.21A - 9/9/2012 12:07 PM   
nick.henderson


 

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Status: offline 		Seconded, any news as there are lots waiting, even for just a set of plans!!
I was lucky as a youngster and used to fly "up front" in these things quite often. Even got the yoke occasionally!

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