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''Spruce Goose'', 8 engine laviathon of a model...

  • Cpl Jones
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05 Apr 2014 12:07 #1 by Cpl Jones
''Spruce Goose'', 8 engine laviathon of a model... was created by Cpl Jones
... Had to share this amazing sight..... my ultimate nightmare, not one, but eight nitro engines...AArrgh!!.. Gorgeous model though eh? I wonder how much Hughes would have paid for the full size to have flown like this model.. :evil:

Cpl. Jones
Join my R.C. flying 'adventures', L.O.S. & FPV, on you tube at
Jah Baga I... thanks!.
Thanks: Klipkopwildlife, Quorneng, THE BLACKBIRD, blue123

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05 Apr 2014 13:44 #2 by Quorneng
Replied by Quorneng on topic ''Spruce Goose'', 8 engine laviathon of a model...
An amazing achievement but like many big IC models way over scale speed and even more so for the landing!

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  • Klipkopwildlife
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05 Apr 2014 13:46 #3 by Klipkopwildlife
Replied by Klipkopwildlife on topic ''Spruce Goose'', 8 engine laviathon of a model...
Actually I think he ripped off the port sponson. Certainly looked a handfull to fly!
Do it now, you may never get another chance

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05 Apr 2014 14:56 #4 by alan cantwell
Replied by alan cantwell on topic ''Spruce Goose'', 8 engine laviathon of a model...

Quorneng wrote: An amazing achievement but like many big IC models way over scale speed and even more so for the landing!


show me a model that flys at scale speed,
i have 2 sides
no you dont,
yes i do,

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05 Apr 2014 16:44 - 05 Apr 2014 16:46 #5 by Quorneng
Replied by Quorneng on topic ''Spruce Goose'', 8 engine laviathon of a model...
I agree. The bigger the full size original the harder it is to make a model fly at anything like scale speed.

The Douglas Skyray in my avatar makes a pretty good job of it but it does look ridiculously slow! :P :P
Last edit: 05 Apr 2014 16:46 by Quorneng.

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05 Apr 2014 16:55 #6 by old fart
Replied by old fart on topic ''Spruce Goose'', 8 engine laviathon of a model...
It's been said before, "you can miniaturize engines, you can miniatutize aeroplanes, but you cannot miniaturize air molecules."
[img
There is nothing like a dream to create the future.

Electrickery is the work of the devil.
Thanks: kamco kid

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05 Apr 2014 17:01 #7 by bogbeagle
Replied by bogbeagle on topic ''Spruce Goose'', 8 engine laviathon of a model...
Yeah, damaged it on landing. Way too fast.

At 12 feet, the scale is tiny, so no hope of anything even remotely convincing. 1/18 scale.

I'll give you some figures later. Gotta go out.

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  • Garry Pollard
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05 Apr 2014 20:25 #8 by Garry Pollard
Replied by Garry Pollard on topic ''Spruce Goose'', 8 engine laviathon of a model...
Surely this a matter of perception , If you were looking at a full size flying away from you , you would be able to see it a long way away, but the model disappears much more quickly because even though you have reduced the size of the model, you havent reduced the size of the sky, which is virtually what Owen meant, so to mimic the speed is possible , but looks wrong , so we dont

Garry

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05 Apr 2014 20:40 - 05 Apr 2014 20:42 #9 by bogbeagle
Replied by bogbeagle on topic ''Spruce Goose'', 8 engine laviathon of a model...
The 1/18 scale Spruce Goose ... to have any hope of scale-looking flight ... would have to weigh 1.3 kg. With a total engine power of O.26 hp. Roughly.

Even then, the radius of turn, at any given bank angle, would be out by a factor of 18, I think.

The only way to do it, is to make a fast, heavy model, then film it at a high frame-rate ... play back at an appropriately slow frame-rate.
Last edit: 05 Apr 2014 20:42 by bogbeagle.

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05 Apr 2014 21:33 #10 by Ex-Member
Replied by Ex-Member on topic ''Spruce Goose'', 8 engine laviathon of a model...

alan cantwell wrote:

Quorneng wrote: An amazing achievement but like many big IC models way over scale speed and even more so for the landing!


show me a model that flys at scale speed,


Most scale indoor models fly at a scale speed Alan, and a lot of the outdoor FF models do as well. The problem occurs as soon as you put in the radio gear which increases the weight, which increases the flying speed.

You need to join us in the Velodrome next time we go there, probably November.

Andy

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05 Apr 2014 22:52 - 05 Apr 2014 23:38 #11 by alan cantwell
Replied by alan cantwell on topic ''Spruce Goose'', 8 engine laviathon of a model...
when i said show me model, i should have said radio controlled model, the lightweight rubber indoor have a decent chance,
i have 2 sides
no you dont,
yes i do,
Last edit: 05 Apr 2014 23:38 by Garry Pollard.

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06 Apr 2014 00:35 #12 by Quorneng
Replied by Quorneng on topic ''Spruce Goose'', 8 engine laviathon of a model...
Well now lets see.
The Skyray had a landing speed of 134mph (196ft/sec).
It was 45ft long so it travelled 4.3 times in own length each second when landing.
Mine is 43" long (3.58ft) so its scale landing speed is 4.3x3.58 = 15.4 ft/sec or 10 mph.
It certainly seems to get down to that sort of speed at touch down however I am not sure it has a maximum 5.4 times as fast like the full size did! ;)

An outdoor RC plane that flies at less than scale speed?

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06 Apr 2014 00:58 #13 by bogbeagle
Replied by bogbeagle on topic ''Spruce Goose'', 8 engine laviathon of a model...
There was a guy who built a 1.1 times Jodel. That would have flown slowly. At the scale speed, it would develop 1.46 times the lift of the prototype.

Unless my reasoning is wrong, of course.

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01 Jun 2014 20:40 #14 by Monz
Replied by Monz on topic ''Spruce Goose'', 8 engine laviathon of a model...
How about eight rubber motors :woohoo:

Thanks: Eric, old fart

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01 Jun 2014 20:52 #15 by old fart
Replied by old fart on topic ''Spruce Goose'', 8 engine laviathon of a model...
Must be a labour of love winding all those motors up. :cheer:
There is nothing like a dream to create the future.

Electrickery is the work of the devil.

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