beauford173(at)verizon.ne
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 Posted: Sun Nov 11, 2007 8:02 am Post subject: IVO Prop Revisit |
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Kolbers and Kolbettes:
More grist for the recent IVO prop mill.... This may or may not be fresh news to some of you... figured
it cannot hurt to pass it along.
....in my slightly sweaty paw this morning... IVO service bulletin number two, which they sent me, along with the stainless steel blade movement detection tape. For your reading enjoyment, I have quoted the first part of the bulletin, complete with their minor syntax burps, below... There is more to the bulletin than appears here, including a section on how IVO blades can come loose and knurled plate instructions and cautions for ultralight models. If you are interested, the complete item was available on their website last time I looked...
www.ivoprop.com/servicebul2.htm
QUOTE:
IVOPROP SERVICE BULLETINS
Subject: Ivoprop ultralight & model 3:1 gearboxes or direct drive engines or 3 cylinder engines.
Note: This service bulletin supersedes any previous operational alerts issued by Ivoprop Corp.
Purpose: To detect blade movement inside the hub due to improper installation and, or
harmonic resonance between prop and power plant; To prevent further flight if this
situation is detected and develops in (sic) unsafe condition (aluminum bushings becoming loose, breaking
bolts, blades etc...) "new blades do not have bushings"
What To Do: Prior to the next flight, accomplish the following:
Get a torque wrench and check its calibration by hanging a known weight on its arm and multiplying the weight
in pounds by the arm length in inches. This reading should be as close as possible to actual recommended torque
on mounting bolts. (We tried several torque wrenches and most of them were off by a lot.)
Check torque on mounting bolts. 200 inch x lbs.
Direct drive engines only: Mark the prop position in relation to the crankshaft. There are two positions to mount a three blade prop and three positions to mount a two blade prop. This makes a great difference in how the prop and engine vibrate together
and each position creates a totally new situation. It is impossible to determine which position is best for your particular prop engine airframe configuration without actually testing on it.
Run the engine on the ground through the full RPM range.
Check the torque on the mounting bolts and, if you are not using locknuts, safety wire the bolts.
Cut the strips of stainless steel tape about 2" long and 1/4" wide (tape supplied with this service bulletin) Clean
the area around the gap between blades, or gap between blades and blade blocks with MEK solvent. Apply stainless steel tape across the gap next and parallel to mold parting line. Use a round object to press the stainless steel tape on the surface.
Follow this inspection schedule to check if tape is broken: After short ground run up through full RPM range, and then first 15 min, 30 min, 1 hour, 2 hours, 4 hours, and then every preflight inspection. Also follow this schedule from the beginning if the prop has been reinstalled in a different position in relation to the crankshaft.
If tape breaks or cracks, remove the tape, clean the surface with MEK solvent and apply new tape and start inspection schedule from the beginning. If tape breaks again do not fly with the prop and contact Ivoprop Corp.
Request to Dealers: Please forward this service bulletin and stainless steel tape to your customers who are subject to this S.B. Keep the record of the addresses of your customers to which this Service Bulletin applies. Make sure that any prop being sold for the above mentioned combinations is accompanied by this Service Bulletin.
Compliance: Mandatory
Note: Do not use prop in 2-blade configuration without blade blocks(missing pieces of pie which fill out the big gaps bewtween the blades.)
UNQUOTE:
...worth what ye paid fer it...
Beauford
FF-076
Brandon, FL
[quote][b]
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