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occom
Joined: 26 Aug 2006 Posts: 404
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Posted: Sun Jun 22, 2008 10:19 am Post subject: C Box and IVO props, now warp prop. |
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I have a warp drive three blade on a 3:1 C box. Is this also a bad combination? Is there an advisory about it?
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gary.algate(at)sandvik.co Guest
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Posted: Sun Jun 22, 2008 2:36 pm Post subject: C Box and IVO props, now warp prop. |
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With my IVO IFA Ultralight 3 blade and 3:1 C Box the only problem i experienced was with the drive gear system. there was never any noticeable vibration and the small SS tape that is used as a vibration sensor also never showed signs of vibration/ I know of a number of people in Canada running the IVO (without IFA) and warp three blade props without problems. It would still pay to check with prop supplier
Gary Algate
Classic 4 Jab2200
Office Phone: +61 8 8276 7655
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"Dave" <occom(at)ns.sympatico.ca>
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Subject
C Box and IVO props, now warp prop.
I have a warp drive three blade on a 3:1 C box. Is this also a bad combination? Is there an advisory about it?
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Guy Buchanan
Joined: 16 Jul 2006 Posts: 1204 Location: Ramona, CA
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Posted: Sun Jun 22, 2008 4:42 pm Post subject: C Box and IVO props, now warp prop. |
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At 11:16 AM 6/22/2008, you wrote:
Quote: | I have a warp drive three blade on a 3:1 C box. Is this also a bad combination? Is there an advisory about it? |
I too have never seen, nor heard anything against a 3-blade Warp on a 3:1 Rotax C box. Not from Rotax, Warp, or anyone service center. I hope someone comes up with some authoritative info.
Guy Buchanan
San Diego, CA
K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar. [quote][b]
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_________________ Guy Buchanan
Deceased K-IV 1200
A glider pilot too. |
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occom
Joined: 26 Aug 2006 Posts: 404
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Posted: Sun Jun 22, 2008 4:48 pm Post subject: C Box and IVO props, now warp prop. |
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I think I found the source of the story on the IVO web site. It's a service bulletin and has very little to do with 3:1 gearboxes, although they are mentioned. I think it's been heavily expanded upon by people repeating the story. The short story is that one series of IVO has a service bulletin when used on 3:1 box, or direct drive, or three cylinder engines.
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gary-n-dorothy(at)tctwest Guest
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Posted: Sun Jun 22, 2008 5:34 pm Post subject: C Box and IVO props, now warp prop. |
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Gary & the others following this thread, or just lurking----
Somewhere I got the idea that the C and E box units, by having the stronger gear sets were supposed to help take care of the Harmonic/ vibration problems with the gears .
When I decided to go with an Ivo- I called and told them that I had a C box currently with a gsc and-- the new power would be ( a blue head with an a 3.47 box E box,) Ivo did not recommend the ultralight 3 blade when I called, but did recommend the medium .. They sent a 3 blade medium ground adjustable, as I indicated that I wanted maximum STOL performance and did not care about top speed.
Since then I became aware of the Service bulletin #17 and according to it, I can't use anything other than a 3-1 ratio with the side rail engine mount.
SO I assume, they had never heard about the bulletin and probably would have told me to get a different set of gears --i.e. 3-1 ratio for the E box.
I haven't called Ivo back yet , but from the gist of all the emails, it is looking more and more like I should mount the old 3-1 C box on the new engine and convert the prop to a 2 blade with Ivo's different spacers. Does this sound like a good idea to you ?
Any of you folks out there with any bits of knowledge you have on this subject feel free to chime in, as I am really starting to get just a little confused :>)
I really just want to install the E box with 3.47-1 and the 3 blade medium prop as it should give me terrific "bite" for take off performance !!!! But if it is going to tear the engine loose from the motor mounts or induce gear damage, then I will stick with what the Rotax engineers recommend.
Gary
N4276M
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dave
Joined: 22 Sep 2006 Posts: 1382
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Posted: Mon Jun 23, 2008 1:33 am Post subject: Re: C Box and IVO props, now warp prop. |
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Quote: | I really just want to install the E box with 3.47-1 and the 3 blade medium prop as it should give me terrific "bite" for take off performance !!!! But if it is going to tear the engine loose from the motor mounts or induce gear damage, then I will stick with what the Rotax engineers recommend.
Gary
N4276M
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I have E box - 3 to 1 works great . tried 2.62 set last year -- worse performance all around. 3.47 I would like to try as well.
IVO medium 3 blade with 3 to 1 and 582 is way too much prop. 2 blade will work best. I have tried 6 or 7 different props all with comparable numbers on the 582. No huge gains to be had. A few % at best. all props do have their own attributes. There are some various prop tests here http://www.youtube.com/profile_videos?user=kitfoxflyer
Does your Kitfox fly like this ? short take offs and cruise at 92 with 582 .......
3 to 1 box harmonics might be a issue........ I think it all stemmed from some IVO UL 3 blade configs loosening off a bit and now that is why witness tape is used to show movement.
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