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Ivo fun with some questions

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carlisle

Joined: 20 Jun 2009
Posts: 72
Location: Sioux Falls, SD

Posted: Sat Nov 06, 2010 5:23 pm Post subject: Ivo fun with some questions

Having a good time with my new IVO 68" ground adjustable light.  Looks like cruise, using a static ground rpm of about 5800 will give me 8-10 mph more than the prior wooden prop putting me well into the yellow arc on my old (but trusty) Model 2, 582 Bluehead, C box, with 2.62:1 ratio.  That is, I was doing about 75 before and am approaching 85 now at 5800 cruise rpm.



A few comments:

-If there weren't so many of them out there flying for so long, and I was the first customer, I'd be a little nervous with the documentation that came with it. Ambiguous (at) times.  Here's an example:



"The only time you need to lock the screw adjuster with lock nut is when you pitch the prop between the neutral and two turns pitch decrease, in all other pitch setting screw adjuster stays where you leave it without a jam nut."



Hmm. My interpretation of this is that the big (32mm) jam nut on the center adjuster bolt is superfluous then.  In fact, I tried leaving it loosely tightened against the flange during a ground run and it quickly loosened and the prop went into coarse pitch.  I read elsewhere on an ultralight blog that the center nut should be tightened to 40 ft/lbs.



Gonna sell my old GSC.  Anybody interested?



Chris Carlisle

Model 2, 582 Bluehead, C box

Sioux Falls, SD

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Beemer

Joined: 26 Aug 2006
Posts: 87
Location: Middle Georgia

Posted: Tue Nov 30, 2010 5:46 am Post subject: Re: Ivo fun with some questions

The "jam" nut they're referring to is the second nut on the shaft. The prop always needs at least one. If you are pitching from neutral through -2, use the jam nut. I use it anyway - better safe than sorry.



Think about it for a minute, and makes sense. If you pitch the blades a bit, the tension of the inner torque rod keeps tension on the nut. If you don't torque the rod, there wouldn't be any tension on the nut to keep it in place.



Clear as mud?



Beemer

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_________________
Beemer
KF2 (and now an M3!)
Suzuki G10 three-banger
Middle Georgia

carlisle

Joined: 20 Jun 2009
Posts: 72
Location: Sioux Falls, SD

Posted: Tue Nov 30, 2010 8:05 am Post subject: Re: Ivo fun with some questions

Thanks Beemer...Mine came with only one Jam nut.  I tighten it all the time now and everything is doing fine.  I figured, with certain pitch settings, that there was enough force on the adjuster/cam arrangement to keep it in place, especially if aerodynamic loads weren't too high.  I guess I was more surprised that IVO would advocate leaving ANY nut loose on such a dynamic system, whether it was load bearing or not.  



Anyway, it's always nice to hear someone else's opinion.  Do you torque yours down to any specific value?



Chris

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