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 <krnet@list.krnet.org> > 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 <propbala...@att.net > <mailto:propbala...@att.net>> 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 > KRnet@list.krnet.org <mailto:KRnet@list.krnet.org> > https://list.krnet.org/mailman/listinfo/krnet > <https://list.krnet.org/mailman/listinfo/krnet> > -- > KRnet mailing list > KRnet@list.krnet.org > https://list.krnet.org/mailman/listinfo/krnet
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