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Hi freebeard,
i like to make sure, that we are talking about the same thing.
I used a turbine flow meter to measure the fuel consumption at constant speed at driving.
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Picking a random link from the Google search:
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Vortex flowmeters, also know as vortex shedding flowmeters or oscillatory flowmeters, measure the vibrations of the downstream vortexes caused by the barrier placed in a moving stream. The vibrating frequency of vortex shedding can then be related to the velocity of flow.
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http://http://www.efunda.com/designs...wmeter_vtx.cfm
My understanding is that you can get good resolution with low volume flows.
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I notice that once your engine block has a legally-mandated clearance, the concern shifts to the windshield wiper motors and the windshield frame. Would they ever be satisfied?
Pedestrians can duck. I'd be more concerned with deer, their reaction is to freeze. That is why railroad locomotives have the sweeping headlight. Sheep are kid sized (ha!). God forbid you should hit a bull.
What I learned on my last road trip: Kangaroo Rats go 'tick', squirrels go 'tock' and rabbits go 'thump'. They're either suicidal, or think they own the road.
