How large is a model engine befor its a full scale engine? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 06-01-2006, 05:40 PM   #1
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How large is a model engine befor its a full scale engine?

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3W-684B4-TS (Twin Spark)$ 8,895.00

This thing is more engine (weight excepted) than any Piper full scale C3 Cub ever came with. Just what kind of a "Model" does this fit? I know that there is a 77lbs limit on total weight for models thanks to the MOT regs for UAV's but can you build an airframe that'll take this kind of power day in day out and still come in under that 77 lbs? or is it a dumb question....

Cylinder Capacity 41.74 684 ccm
Power Rating 60.0 HP 43.8 kW
Bore Diameter - -
Stroke - -
Weight 32.3 lbs 14,700 g
Speed Range 1200-7500 RPM
Crankshaft 3 Ball bearings
With rear output / starting shaft
Connecting Rod Needle bearings on both ends
Oil / Gasoline Ratio 1:50 - 1:80 Mix
Ignition Input Voltage: 6.0 to 8.0 V
6.0 V NiCD / NiMH or 7.2 V LiPo / Li Ion

Cylinder decompression valves for easier starting

Available in single or twin spark plug versions
Salutations from the Pacific North WET!

S.P.A.D.s, Fibreglas & Balsa EDF's, Foamies, Brushless powered and nitro balsa planes, they're all in my hanger, just don't explain what it all means to the mrs, eh?
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Old 06-01-2006, 06:00 PM   #2
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Well, that's very interesting.

"Model" has nothing to with size, unless you qualify it - say 1/4 size, 1/72 size, 2x size and so forth.

It need not be scale either.

A model can be any size. And you could build a scale or somewhat scale model of a Piper J-3 at 3x size of the original which is being duplicated, copied, imitated or modeled.

Whether it's practical or not is an entirely different matter, if that is what you mean.
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Old 06-01-2006, 10:49 PM   #3
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I believe that motor is meant for the largest of models in Europe. Canadian and US rules wiht respect to aircraft weights are much more stringent than in Europe...that's why you see the massive 60% and 70% models in Europe and not on domestic shores. I'm also guessing that 3W, a German company, saw the need for this market.
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Old 06-02-2006, 11:19 AM   #4
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It would be interesting to see from the factory what part of the market they are really after. Offering it to the model community may be just an extra group. I believe they maybe more into the ultralight type or military uav market. If you notice they also will go dual plugs and probably other items that would be required in the real world. There are quite a few engines in those markets that where never designed to fly. Water cooled snowmobile engines for one as an example.
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