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Author Topic: Personal Build - Grumman/McKinnon Turbo Goose  (Read 1335 times)
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Bredehoft
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« Reply #25 on: February 04, 2017, 12:27:41 PM »

So the model is virtually complete.  I only have to make the rear motor peg.  It will be aluminum tube - extending out the sides to the width of the nacelles.  There will be small hooks on each end to capture the rubber.  I plan on starting with stripped rubber, about 0.050" width for each motor, to start.

Here is how the rubber will exit the nacelles.

http://www.volareproducts.com/files/goose/GooseBuild29.jpg

Here is a little surprise.  I expect this to climb to 12.5g with the motor peg and probably additional tail weight.

http://www.volareproducts.com/files/goose/GooseBuild27.jpg

And a couple of "beauty" shots.  It is not perfect, but I am happy with it so far.

http://www.volareproducts.com/files/goose/GooseBuild30.jpg

http://www.volareproducts.com/files/goose/GooseBuild31.jpg

Maybe Thursday, I will see if it flies.  I'll be nervous testing it indoors...we'll see if I can get over that.

--george


Personal Build - Grumman/McKinnon Turbo Goose
Personal Build - Grumman/McKinnon Turbo Goose
Personal Build - Grumman/McKinnon Turbo Goose
Personal Build - Grumman/McKinnon Turbo Goose
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Copbait73
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« Reply #26 on: February 04, 2017, 12:52:03 PM »

Looks great George.
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Mefot
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« Reply #27 on: February 04, 2017, 12:53:17 PM »

This is shaping up to be a fine looking model. Looking forward to seeing it in flight  Smiley
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flyfac
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« Reply #28 on: February 04, 2017, 09:50:06 PM »

Impressive build, George, especially at peanut scale! 

Looking forward to flight reports.

You planning on selling plans for this one?  ;-)

Best,

Scot Dobberfuhl
Forest Grove, OR
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tom arnold
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« Reply #29 on: February 08, 2017, 12:23:19 PM »

Beautiful job, George. A peanut twin is beyond my sausage fingers and I love to see one built. I have a question I should have asked earlier, though:

In making the Nason clutch, is the clutch wire the same diameter as your shaft wire? or smaller? Also how in the world do you make such and tight and tidy opposing bends in the clutch wire? In other words, I can make bend #1, then slide it through the bearing tube (or drilled hole in the propeller, as the case may be) but making the SECOND bend always comes out poorly. Normally, I have to grab the wire with a needle nose pliers at it's exit from the bearing tube and use another pliers to make bend #2. The problem is the short length of the wire that was the pliers gripping area now allows an awful lot of fore-and-aft slop that makes the final tweaking to make sure the bent "dogs" catch more difficult and usually a spinner won't go over my attempts. So to see you pull this off with a peanut twin spinner is pretty stunning.

My prop shafts are the standard .047 diam wire and I bend the clutches from the same stuff. I tried using lighter wire for the clutch but often it would bend under the torque I would use for a 24" span model (just for background info).
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Bredehoft
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« Reply #30 on: February 08, 2017, 02:33:57 PM »

Hi Tom,

I think that is 0.020" or 0.025" wire on the clutches.  I just bend it against the prop.  Since it is so fine it bends easily.  Also, since I am using fine rubber, I don't need overly strong wire.  I think I stated I used 0.025" for the prop shafts?

By the way, I have put in a few test flights on single loops of 0.050" rubber.  I got it to start to fly.  It required nose weight, down thrust, and down elevator.  I guess I got some part of the design or construction wrong  Wink  Anyway, I got a fairly stable flight that curved across the yard, avoiding some pine branches, but it didn't avoid them all and tumbled to the snow-covered ground, undamaged.

Real testing tomorrow indoors.

--george
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tross
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« Reply #31 on: February 08, 2017, 02:53:57 PM »

I guess I got some part of the design or construction wrong  Wink 

Not necessarily.
It flew so I say you did it right. Grin
Seriously, these little buggers are sensitive as you know, so it looks great and flies. Cheesy


TR
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Ray_K
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« Reply #32 on: March 20, 2017, 10:37:15 PM »

3-20-2017

Great model George, I love it, to bad it won't be a kit, I'd buy one.

Outstanding job George!

Cheers, Ray K.
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