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IVO prop dyn. balancing
I got a IVO magnum prop in-flight adjustable - no spinner. Did anyone
do a dynamic balance on one of these? ------------------------------------------------------------------------------------------------------------------ SQ2000 canard http://www.abri.com/sq2000 |
#2
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IVO prop dyn. balancing
I rebalance mine every time I switch blades or any combination. They
are real close right from Ivo but the last touch of precise balancing makes it VERY smooth.... I get mine done at Jackson Hole Aviation. Most good FBO'S have a dynamic balancer.. Ben www.haaspowerair.com |
#3
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IVO prop dyn. balancing
I don't have a spinner on mine. Where would you add the balancing
weights (washers)? |
#4
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IVO prop dyn. balancing
Hmmmm, If you are running the paddle blades you can slightly shorten
one to get it in balance because the paddle blades are blank on the ends, if you are running the rounded blades then your only choice is to place the weights under a prop bolt. I guess the question is,,,why no spinner??? |
#5
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IVO prop dyn. balancing
stol wrote: Hmmmm, If you are running the paddle blades you can slightly shorten one to get it in balance because the paddle blades are blank on the ends, if you are running the rounded blades then your only choice is to place the weights under a prop bolt. I guess the question is,,,why no spinner??? We had an IVO prop on a Glastar and couldn't get it to stay balanced. The blades, being held by only two bolts each, can move (or swing) chordwise in the hub just enough that the assembly ends up being off-balance chordwise, and no amount of spanwise balancing will fix it. Even with those bolts torqued to spec we had blade movement between the plates. Fretting was evident on the blade bushings and mating plate surfaces. Scared us. Too bad, since the prop pulled well, better than the Warp Drive that replaced it. The Warp was so much easier to balance but presented more hassle when changing pitch. Dan |
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IVO prop dyn. balancing
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#7
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IVO prop dyn. balancing
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#8
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IVO prop dyn. balancing
The blades, being held by only two bolts each, can move (or
swing) chordwise in the hub...... Even with those bolts torqued to spec we had blade movement between the plates. Fretting was evident on the blade bushings and mating plate surfaces. Scared us. When ground testing my auto engine with an old style 3 blade IVO prop, I took several still photos. Some of the photos appeared to show the blades advancing or retreating much like that of a helicopter.....not sure if this was a trick of the camera or actually happening. After about 10 hours of ground time I found damage to the base of the blades. Now that the engine is flying with an MT prop I have been unable to duplicate that effect in any of my photos. Russell Sherwood Houston, TX |
#9
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IVO prop dyn. balancing
When ground testing my auto engine with an old style 3 blade IVO prop, I
took several still photos. Some of the photos appeared to show the blades advancing or retreating much like that of a helicopter.....not sure if this was a trick of the camera or actually happening. After about 10 hours of ground time I found damage to the base of the blades. Now that the engine is flying with an MT prop I have been unable to duplicate that effect in any of my photos. The focal plane shutters used in many good cameras would give that bent-prop effect. As the shutter gap moved across the plane, either side-to-side or top-to-bottom, one side or edge of the film was exposed before the other, so a rotating prop or rotor would be caught over a rather long time, spread across the film, and would appear bent or out of phase. I don't know that the IVO would move all that much, unless it was flexing as well. I didn't like the IVO's thin-skinned sandwich construction, either. Seemed to be a lot of load on very little fiber and a lot of foam. The aperture shutters found in smaller, cheap cameras wouldn't "bend" rotating stuff.. Were you using the same sort of camera both times? Dan |
#10
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IVO prop dyn. balancing
When ground testing my auto engine with an old style 3 blade IVO prop, I took several still photos. Some of the photos appeared to show the blades advancing or retreating much like that of a helicopter.....not sure if this was a trick of the camera or actually happening. After about 10 hours of ground time I found damage to the base of the blades. Now that the engine is flying with an MT prop I have been unable to duplicate that effect in any of my photos. Russell Sherwood Houston, TX This is all VERY interesting.........Thanks for the feed back... Ben www.haaspowerair.com |
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