ROTAX recommends dynamic balancing every 200 hours. Since this is a rather pricey operation, I'm wondering if others have done this and whether it is $$ well spent. That is, was there a noticeable difference in less vibration? Was the difference measurable?
I'm aware that vibration can kill gear boxes and electronics. Thanks

Views: 291

Reply to This

Replies to This Discussion

I do not know the cost of dynamic balancing, but maybe you should do it yourself.  Considering all other expenses, the cost a Dynavibe is only around $1,600.

I have dynamically balanced my prop on my 912iS. The amount of balancing needed is dependent on the propeller/spinner you are using. Some props are notoriously unbalanced. My prop/spinner combo was not too bad, but I could feel the difference (improvement). The reason that Rotax wants you to do it, is because Rotax has dual carbs and vibration will cause wear to the carbs which will cause the engine to run rough and vibrate even more. Balancing the prop will not compensate for carbs being out of sync. You must make sure your carbs are sync'ed first or you are just wasting your time (and money). Our club bought a Dynavibe and it has been a good investment. Most everyone has said that they could feel a marked improvement. Makes everything in your plane last longer.

Thanks guys. Will take your good feedback under advisement...

We rent out our prop balancer here at Viking for those that don't want to take the plunge and buy one. -Alissa

Thanks, have someone locally

Way late to this conversation. Not for you specifically Herb, but in general for any Rotax powered Zenairs, just make sure that who ever is doing the balancing understands geared engines. Or at least, that's my very limited knowledge of the situation. 

Way back around 2000 my dad took his 601 with a Rotax 912 to an established maintenance shop that was thought to be competent but couldn't understand how to balance a geared engine properly. They tried a couple times and claimed the numbers were right.  We ended up with a worse balance than we started with, which one could feel as a buzz in the rudder pedals, which might have led to the exhaust system cracking we experienced on a long trip just afterwards. Various frustration and expense ensued.  (And left us suspicious of balancing shops unfortunately.)

My dad then just took the prop apart, an Ivoprop, and static balanced the blades, shaving bits off as needed. Just that static balance improved things to better than before taking it to the shop, and we left it at that.


New from Zenith:

Zenith Planes For Sale 

Classified listing for buying or selling your Zenith building or flying related stuff...

Custom Instrument Panels
for your Zenith

Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, Dynon and Garmin avionics, and more.

Custom Upholstery Kits for your Zenith Aircraft:

Zenith Vinyl Upholstery Kits

Zenith Apparel from EAA:

Zenair Floats

Flying On Your Own Wings:
A Complete Guide to Understanding Light Airplane Design, by Chris Heintz

Builder & Pilot Supplies:

How to videos from

Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit for the latest DVD titles.

Aircraft Insurance:


West Coast USA:

Pro Builder Assistance:


Transition training:

Golden Eagle Aviation

Pianosa Flying Farm

Aircraft Spruce & Specialty for all your building and pilot supplies!

© 2021   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service