flywheels.. weighting your crankshaft

roddie Thu Nov 19, 2020 6:23 pm

I was wondering if having additional inertial-mass (other than a spec.-propeller) mounted to a model aero-engine, might affect certain aspects of performance. I realize that a throttled engine's response-time would be negatively affected.. but might it provide for "smoother-transitions"?

Model aero-propellers don't have much mass. They induce a "load".. but not much of an inertial one. A spinner is a flyweight.. but most are insignificant contributors to inertial-weight. The Higley "Heavy-Hub" is a better example.

I'm remembering the old "hit n' miss" engines. They weren't 2-strokes.. but the "inertia" principal is what I'm thinking about here.

Could flyweighting your engine's crankshaft "buy you a few strokes" to avert a flame-out?

I'm not an "engine guy".. but I do enjoy learning more about them. Smile

Ken Cook Thu Nov 19, 2020 6:46 pm

Would you run a marathon wearing 20 lb sneakers?

Oldenginerod Thu Nov 19, 2020 7:01 pm

Ken Cook wrote:Would you run a marathon wearing 20 lb sneakers?

I'd still have about the same chance of finishing lol!

roddie Thu Nov 19, 2020 7:13 pm

Oldenginerod wrote:
Ken Cook wrote:Would you run a marathon wearing 20 lb sneakers?

I'd still have about the same chance of finishing

Thanks for your replies.. Laughing

roddie Thu Nov 19, 2020 7:25 pm

Let's take good look at the Cox .049 garden variety reed-valve "product" engine. It powered all-types of model-drive systems. The Sea-Bee (submerged prop runabout boat), countless land-vehicles.. of varying gear-ratios. The JoMac/Jerobee series. These engines can be optimized.. What's your formula?

davidll1984 Thu Nov 19, 2020 8:58 pm

Best land engine is cox gtp with the egr valve very hi rpm say 30 000 on the box y play lot wit them y owns 2 Snowmobile engine lots of jerobee .049 jerobee modified tee dee so meny difrent engines To number al of them dont tink ad weight To rear of the prop wil help performance just help hold rotation in case of long loop fuel wil stop flow may be weight may help recover fuel delivery and restart ??? Je just may its just posible effet in flight ad of very litle weight change wit that parts from cox

flywheels.. weighting your crankshaft Screen40

**Cribbs74** Thu Nov 19, 2020 10:21 pm

On a glow engine a “flame”out caused by lack of fuel will also extinguish the glow. One can’t work without the other. So as soon as the glow goes away it doesn’t matter if the fuel picks back up.

On an old spark engine it would work I suppose.

For me I’d rather spare the weight and work on getting a better run by fixing the engine or fuel delivery.

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