DynaVibe Pros

[Geek]

I know the accelerometer goes as far forward and center on the engine as possible. All the pics in the manual show the tach mounted right next to or close to the accelerometer. I am wondering if there is an issue with mounting the tach on the side (like the pic). I am still in the 'waiting for paint to dry' phase so am doing stuff to get ready for farther down the road- like having the mounts ready for the DynaVibe.

Thanks

Gary

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[Delta Whisky]

Gary - preferred mounting of the transducer is perpendicular to piston movement. From the manual: "The accelerometer and optical tach are typically mounted on the top of the engine. The optical tach should be mounted approximately six inches behind the back of the propeller. The accelerometer should be mounted as far forward as is safely possible. This will provide maximum sensitivity. . . . . . . Mount an accelerometer mounting bracket to the bolt adapter and mount the accelerometer to the bracket. The optical tach bracket can be installed under the bolt or at a different location. Position the optical tach such that the beam projects onto the back of the blade or spinner back plate. . . . . . . . . . . . . . The accelerometer is mounted vertically, perpendicular to piston travel."

For what it is worth, here's how I did mine.

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You probably saw all of the above in the manual but I've found I don't always see what is in the manual during the first read. (Just saying.)

[Geek]

Thanks Darrel. Yup I saw that and understood it (scary but I did). The only thing I can figure is that if I mount the optical tach on the side rather than the top, it changes the reference as to where I start measuring the number of degrees to place the weights. I like your install on the transducer. Think I am going to copy that one. You got it far forward and on top which should give you the best info when you do the measurements.

Thanks again for the response.

Gary

[Delta Whisky]

Gary - I can't find my (really) old copy of the instructions and the most current set (on my computer) isn't clear on from where the weight mounting locations are determined but the data sheet suggests or at least implies the transducer makes the determination. ("Accelerometer is zero degrees") But the prop has to be rotated until the light is triggered. That tells me you can mount the tach where you wanted. See if you interpret the data sheet the same way. BTW - I got much better results after narrowing in on the answer thru ground tests and then flying the set up.

[Geek]

Gary - I can't find my (really) old copy of the instructions and the most current set (on my computer) isn't clear on from where the weight mounting locations are determined but the data sheet suggests or at least implies the transducer makes the determination. ("Accelerometer is zero degrees") But the prop has to be rotated until the light is triggered. That tells me you can mount the tach where you wanted. See if you interpret the data sheet the same way. BTW - I got much better results after narrowing in on the answer thru ground tests and then flying the set up.

That's my plan Darrel. I guess I could call the company and ask the question too but you're right - my interpretation is that I could mount on the side as long as I use that position as the zero point for determining the weight location.

[bbs428]

That's my plan Darrel. I guess I could call the company and ask the question too but you're right - my interpretation is that I could mount on the side as long as I use that position as the zero point for determining the weight location.

I had mine off to the side and used that position as the zero point. Worked like a charm!

[Geek]

I had mine off to the side and used that position as the zero point. Worked like a charm!

Thanks Brett. Appreciate the input. It's that "Enquiring minds wanna know" thing.

Gary