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Author Topic:   Timing "Time To Plane"

DVollrath posted 07-12-2013 02:15 PM ET (US)
I just saw Sterling's report on the Yamaha 200hp motors, and it got me to wondering how the testers conduct these trials. Is there a precise, instrument verifiable definition of when the boat is on plane? Seems to me that measurements in the hundredths of seconds are somewhat dubious, but who knows. Anyone have any insight into this process?
Thanks.
Dennis

jimh posted 07-12-2013 02:45 PM ET (US)
The transition to plane from displacement speed usual causes the bow to rise. When the bow returns to its steady angle, you are on plane. That would mark the end of the on-plane transition. The start would be marked by the increase in throttle to the engine.
K Albus posted 07-12-2013 08:20 PM ET (US)
To measure time-to-plane, you start by taking a measurement with an inclinometer while your boat is on plane. You come to a complete stop, and then use a stopwatch to determine how long it takes to get back to that same measurement while bringing the boat up onto plane. You should average several trials.
If somebody is reporting their time-to-plane out to the hundredths of a second place, they are most likely using a digital stopwatch to record the time. I believe there are several free or cheap inclinometer apps available for smartphones, so time-to-plane should be fairly cheap and easy to measure.

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Author	Topic: Timing "Time To Plane"
DVollrath	posted 07-12-2013 02:15 PM ET (US) I just saw Sterling's report on the Yamaha 200hp motors, and it got me to wondering how the testers conduct these trials. Is there a precise, instrument verifiable definition of when the boat is on plane? Seems to me that measurements in the hundredths of seconds are somewhat dubious, but who knows. Anyone have any insight into this process? Thanks. Dennis
jimh	posted 07-12-2013 02:45 PM ET (US) The transition to plane from displacement speed usual causes the bow to rise. When the bow returns to its steady angle, you are on plane. That would mark the end of the on-plane transition. The start would be marked by the increase in throttle to the engine.
K Albus	posted 07-12-2013 08:20 PM ET (US) To measure time-to-plane, you start by taking a measurement with an inclinometer while your boat is on plane. You come to a complete stop, and then use a stopwatch to determine how long it takes to get back to that same measurement while bringing the boat up onto plane. You should average several trials. If somebody is reporting their time-to-plane out to the hundredths of a second place, they are most likely using a digital stopwatch to record the time. I believe there are several free or cheap inclinometer apps available for smartphones, so time-to-plane should be fairly cheap and easy to measure.