What masquerades as engine vibration is often due to propeller imbalance.
"I didn't realize how rough my ride was, assuming that much of the vibration was coming straight from the engine. But, when Brian worked his DynaVibe magic on my prop, the airplane really smoothed out.
Cross-country is so much less fatiguing now, and it's obvious that there's less stress on the airplane."
- Elgin Wells, "Starjammer"
how do i know where to add weight?
The DynaVibe Classic reports the heavy location as an angle. To identify the heavy location, begin by noting the position of the acceleromteter (usually 12 o'clock) and then measure the indicated angle in the direction of the propeller's rotation to find the assembly's heavy location. Then, either add weight across (180 degrees) from the indicated heavy location, or remove weight if too much was added during a previous adjustment.
How much weight do I add?
The first weight addition is always an educated guess called the "trial run." Adding weight during this trial run not only brings the prop assembly into better balance, but also indicates the sensitivity of that particular assembly by indicated the change in vibration magnitude (IPS) vs. the amount of added weight.
For example, if the initial reading is 0.5 IPS, you'd add 25 grams as a trial weight and then take another measurement. If the 25 gram weight solved half of the imbalance, then you know you need 2X that amount. Repeat the process as needed to "zero in" on the exact weight and solution.
What if i decide later that I would like a DynaVibe GX?
No problem. We offer trade-in credit for your DynaVibe Classic if your needs change in the future. Call us for details.
"I spent the day yesterday fabricating a good mounting bracket, and then balanced a friend's Thorpe T-18. My friend and I were absolutely stunned at the result! I am not sure what I was expecting, but the result is truly amazing! What a fantastic thing this DynaVibe is. I now have three more friends demanding the same results!"
- Mike Melvill, Pilot, SpaceShipOne