Dynavibe summer tour

[n85ae]

Dynavibe report:

Easy to use, once figured out. Trickiest part was finding the little red light
on the back that's used for setting up the reflector.

Just finished my IO-240B with it. I never thought my plane was that rough,
but I guess it was 2.1 ips @ 180 degrees when I started, .07 @ 248 after
adding some weight. Interesting because my prop static balances perfectly
so I think my backplate/spinner make a lot of difference with the balance.

Think I could have tuned it a bit more, but too many voices saying "Dad
can we go home now!?!". Hopefully I can fly it tomorrow. I can tell the
difference at runup already, and I think I picked up 30-40 rpm at full
power static as well which went from about 2250 to just under 2300

Who get's it next? Send me an email at n85ae (at) yahoo.com with your
address and I'll get it on the way.

I printed out a manual and put it in the case, along with a bracket I made for
the IO-240 for the accelerometer. I used the lifting ring for the engine per
Bruce Lina's included pic for attaching the optical sensor.

Finn send me an email with your address, and I'll send you a check.

Best Regards,
Jeff Hays

[Dorsal]

I think hansedj is next on the list, glad it worked well for you.

[n85ae]

Worked great! I've been trying to figure out the high initial ips readings all day, since my prop was static balanced. Then I realized I have some extra holes in my spinner backplate from previously having a warpdrive 3-blade on it, and now
I have a sensenich two blade. Same backplate, new spinner, but a handfull of
extra holes.

Oddly I never thought it vibrated much, but it should (according to google) have
exploded in flight with the high initial ips.

Anyway - .07 ips now, and very happy. Thanks again for sending it around!!!

Regards,
Jeff

[wadeg]

Count me in!
Wade greaves Portland Oregon

[Av8r_Sed]

The Dynavibe produced a different result for me and may have saved my butt. I was unable to obtain a stable reading with the device. The velocity (IPS) reading varied widely up to 2.3 IPS and the phase angle kept rotating forward. E-mail support from RPX Technologies (Dynavibe manufacturer) was excellent. They suggested something must be moving, maybe my spinner.

I removed prop and spinner to get the spinner backplate off and discovered that one of my IVO medium blades is cracked (see pic near upper right bolt). That explains the movement and why the Dynavibe wasn't giving good readings.

IVO says the blade is unrepairable so I have to send them the remaining good blade and check in order to get a matched pair back. I'm not happy at having to shell out some bucks, but am very happy to have found the issue while on the ground.

Dorsal's added me to the end of the summer tour list so I can balance everything once I'm properly propped again.

I think it's time for me to retire the UHS fiberglass spinner. The time it takes to remove and reinstall in order to re-torque the prop bolts at the IVO specified 10 hour intervals is just too inconvenient. Or maybe I should switch to a less maintenance intensive prop.

[DesertFox4]

Or maybe I should switch to a less maintenance intensive prop.

No such prop exists that I know of.
P.S. It takes a lot to break an Ivo. Are certain you don't have something else wrong that caused this? Gearbox, mounts?

[Av8r_Sed]

I can't think of any other factors. I put in new mounts less than two years ago and my gearbox has not had issues I'm aware of. Initially the engine ran very rough due to the somewhat high inertia of the medium prop but I installed a clutch which smoothed things out. I closely adhered to IVO's torquing schedule up through at least 20 hours and whenever I changed plugs or had the spinner off to adjust pitch which has been fairly often (I'm only up to about 95 hours).

[GT280flyer]

Dorsal I would like to be added to the list of stops for the prop balancer when it comes back to the east coast.
Thank, Tim
Kitfox lll
Model lV wing
Hirth 3503

[Slyfox]

my thought on that prop breaking is ouch. I would set up a dial indicator and check that hub coming out of the gear box. possible you had a tipper on that gear box once upon a time. meaning an old prop hit on landing or something. now the hub is bent. than being a 2 stroke maybe the bearings are going bad. I would check things out real good before putting a prop back on er.

[dholly]

Dorsal I would like to be added to the list of stops for the prop balancer when it comes back to the east coast.
Thank, Tim
Kitfox lll
Model lV wing
Hirth 3503

Perhaps in time for the NEKFFI?