 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
jindoguy(at)gmail.com
Guest
|
 Posted: Fri Oct 26, 2007 5:46 pm Post subject: I really love Ivo Props, now |
 |
|
Thanks for all the warnings and all, but did you guys read the part about, I cut them down and made them fit properly? Honest, I really do appreciate your concern, but there's something to be said for reading AND comprehension.
Okay, it was a really bad day of doing work that others should have done right the first time, and I'm cranky.
So here's the deal with the IVO problem. The spacers I have were numbered 1035. I have no idea how many cavities the mold has or whether that's a general part number for parts made from a single cavity. Whoever last worked on the mold ground the ejection pins too short so there are two bumps about .005" proud of the surface on these blocks. The spacers are 1.023" at the bumps and the prop blades are .997" to 1.004". I first put the whole thing together and torqued just the two bolts through the spacers thinking they might collapse, be squeezed or in some other magic way allow everything to seat up, but there is no tooth fairy or Ivo fairy god mother, so, no luck. The blades wobbled around like I do after drinking six Zombies. Given the average ultralight pilot's level of workmanship, present company excepted, I couldn't resist just torqueing down the blade bolts and, yes, you guessed it, the whole thing snugged right up. It didn't surprise me at all, but I just couldn't bring myself to leave it that way, so it all came off and the block went in the mill vise to be flycut. Since the joy of cutting plastic is only exceeded by nailing snot to a tree, I took .009 in two cuts off each side, figuring that the surface finish would now allow the blocks to crush slightly. It worked. Now when I torqued the spacer bolts first the blades were clamped quite nicely. torqued the blade bolts and we were off to the races.
That wonderful quick adjust mechanism, oh yeah it's fast. but you're left to the mercy of how the crank ends were welded on the rods, how the ends of the rods were bent and how the rods were inserted in the foam cores and then into the mold for the final addition of the carbon fiber outer shell.
How do I know this? In the course of tracking down other problems today it occurred to me to put my handy dandy Warp Drive protractor on the Ivo so I could see how much I was quick adjusting it. So I quick adjusted the damn thing and found I needed to adjust some more. This happens with any ground adjustable prop, I don't fault Ivo for that, it's just part of the process of dialing in the prop until it's properly set for the Rotax. It was when I started to find the difference between the two blades was half a degree and there was not one single thing I could do to quick adjust it out.
And then there's that wonderful torque schedule. Run engine three seconds sprinkle fairy dust 'til you sneeze and retorque, run engine six seconds, more fairy dust, more sneezing, retorque again, because the damn thing is loose. Run engine, chant encantations, more fairy dust, more sneezing, RETORQUE.
I hate Ivo props.
Okay, I may not be better now, but it's starting to get it out of my system. Like someone said here, props are like religion. If you like Ivo's you like em. I don't.
Warp Drives and Powerfins may have their drawbacks, but at least you can:
A) Adjust the blades to a gnat's hind end of relative uniformity.
B) Keep them torqued properly and they stay that way. When you go back and check, you don't find that the bolts turn another 30 degrees just because you dared to start the engine.
Did I mention I hate Ivo Props?
Please, ya'll, take this as the wild ravings they are meant to be and have a laugh. As Greg Clayman used to say, "not too serious".
Rick
[quote][b]
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kolb-List |
|
|
|
| Back to top |
|
 |
R. Hankins
Joined: 18 Jan 2006
Posts: 185
Location: Grants Pass, Oregon
|
| Posted: Fri Oct 26, 2007 9:02 pm Post subject: Re: I really love Ivo Props, now |
|
|
Sorry to hear you are frustrated with your IVO. I was pulling my hair out when I installed my 66 two blade, trying to get the two blades to track the same. I could not get the last 1/8th" out without shimming. Ivo assured me that was close enough, so I abandoned the shims. 431 flight hours later it is still pulling smoothly. I replaced the metal leading edge tape with the powerfin stuff 300hrs ago.
There is no question that Warps are tougher, but a quick search of the archives will show that most pilots who have owned both props rate the IVO as smoother. Maybe all of that flexibility evens out the differences between blades?
As for thrust, just about everyone claims their prop has the most or is more efficient. I get 1300fpm sustained climb with a 503 with my IVO, so it is no slouch. I'm still hoping to switch props with Larry Cottrell at the Rock House proving grounds one of these days and get an apples to apples comparison with a two blade Warp.
My bolts quit moving after the first ten hours. I put a drop of torque seal on the bolt heads as a visual check for preflight, but I only check the torque every hundred hours or so now.
Take care...
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kolb-List |
|
_________________
Roger in Oregon
1992 KXP 503 - N1782C |
|
| Back to top |
|
|
planecrazzzy
Guest
|
| Posted: Sat Oct 27, 2007 7:54 am Post subject: Re: I really love Ivo Props, now |
|
|
IVO's are simple.....never had a problem with 3 blade or 2 blade....
.
.
Gotta Fly...
Mike & "Jaz" in MN
.
.
FSII / 503 w/B box , 2 blade 66" IVO w/spacer blocks
.
.
.
.
.
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kolb-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
