Thanks to all the KR folk for giving me so many good options. On Tue, May 31, 2022, 10:52 AM svd via KRnet <[email protected]> wrote:
> where in nor cal? > > eaa 1541 (lincoln) has a dynamic balancer and does it for a contribution > ofsomething like$100 > > > On May 31, 2022, at 12:06 AM, Gary Sack via KRnet <[email protected]> > wrote: > > Help! Yes, my prop is dynamically unbalanced and blindly sanding at > guessed at locations has helped somewhat. I now know I need a $1500 > Dynavibe balancer, which is a quarter what I paid for N81JM. Can these be > rented? Does anyone in Northern California have one? Any suggestions? > > On Thu, May 26, 2022, 5:40 PM MS <[email protected]> wrote: > >> I'll second the importance of keeping the prop dynamically balanced. >> >> A Dynavibe balancer, the one they call the "Classic" (rather than the >> higher priced model the name of I've forgotten, other than they want 4K for >> it) should be conidered an essential hangar tool. Mark has one and I've >> got both the classic and the X3 or whatever they call it. I've got both of >> them - the company just sent me the fancy one when it first came out. When >> I asked "why" they just said they'd appreciate an evaluation. In view of >> such generosity I didn't really give them an evaluation of the X3 since, to >> me, it's a complete waste of money. It will accept two cables providing >> info from two sensors, one in front and the other at the rear of the engine >> thus helping to diagnose some internal problem. You still have to take the >> engine apart to see what the issue is, so what good is a vibration >> diagnosis? At any rate, the features of the X3 may be of use to full-time >> engine professionals. For keeping a smooth prop that does just as good a >> job as its expensive brother, the $1500 Classic model is excellent. I >> found the X3 unusable actually. Supposedly it tells you exactly how much >> weight to use when balancing, but this is something you get a "feel" for >> after using the cheap one for any period of time. You still have to run >> the engine up one more time to check the accuracy of the weight placement, >> whichever one you're using, so the X3 turned out to just be a PITA. I >> should have sold it long ago. It's just another thing I've let pile up >> that needs doing. >> >> Anyway, a dynamically balanced prop is a joy to operate. You'll get more >> RPM's for the same throttle/mixture setting. Instruments and control >> attachments will be less stressed, as will the pilot and passengers and the >> engine bearings. There's nothing like doing your balancing yourself. >> Take it to a shop and you can bet they won't do as fine a balance as you >> will. I've done a few balance jobs that had been recently balanced by a >> "shop" and in some (most) cases their margins were ridiculous compared to >> how perfectly you can do it using your own balance job. Since the intro of >> the Dynavibe back in 2006 or 7, one or two other companies have come out >> with low cost balancers so they're not hard to find. I can't imagine >> they'll be any better than the Dynavibe however. I've done dozens and >> dozens of balance jobs since I got mine in 2007 and I've never needed any >> maintenance with the sensors or the hand-held computer. Mount it on a >> pedestal shop fan for practice and to learn how it works and save a bunch >> of avgas. >> >> The "C" model Comanche and the Twin Comanches after a certain year had >> extensions and didn't have problems . . . but then they had Lycomings, not >> Revmasters. The cranks may be just as good on both, for all I know. They >> have to be forged of course. Cast cranks (and flywheels, etc.) were the >> death of HAPI. >> >> Mike >> KSEE >> >> >> >> >> -- >> KRnet mailing list >> [email protected] >> https://list.krnet.org/mailman/listinfo/krnet >> > -- > KRnet mailing list > [email protected] > https://list.krnet.org/mailman/listinfo/krnet > > > -- > KRnet mailing list > [email protected] > https://list.krnet.org/mailman/listinfo/krnet >
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