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04-23-2019, 04:46 PM
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Join Date: Mar 2008
Location: Anacortes, WA
Posts: 823
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RPM stay out zone
I have the YIO-360-M1B and Hartzell CS Prop that you buy thru Vans on my 7A. Am I suppose to have a stay-out zone on RPMs between 2150 - 2350 where continuous use is not advised? Or a "yellow" stay out zone?
I've seen this in other POH's but I can't verify it is necessary. If true is this a attribute of the engine/prop combo? Or use of this engine/prop on an RV7A?
Thanks for clarifications.
__________________
Steve Lynn
RV-7A
Flying Phase I
Anacortes, WA
www.mykitlog.com/sglynn
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04-23-2019, 04:55 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Steve, the RPM zone changes with product changes, so it would be best to get this from Hartzell for your (prop) serial number and engine model. Compression ratio, timing etc can make a difference.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
Last edited by BillL : 04-23-2019 at 05:54 PM.
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04-23-2019, 05:12 PM
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Moderator, Asst. Line Boy
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Join Date: Jan 2010
Location: Flower Mound, TX
Posts: 1,473
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Quote:
Originally Posted by BillL
Steve, the RPM zone changes with product changes, so it would be best to get this from Hartzell for your serial number and engine model. Compression ratio, timing etc can make a difference.
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Bill is correct. It's an RPM range where the Hartzell engineers have noted excessive vibration. However, it can change from other factors.
For example, I have the same engine and prop as you. Based on the engine, prop, and hub model and serial numbers, the Hartzell folks gave me the same avoidance range.
Now, however, with the addition of two PMags, they want me to avoid 2000-2250 for extended operations. I folded these into my POH and adjusted the green and yellow bands in my Skyview EMS.
Give the Hartzell folks a call: They'll send you a great email reply. I printed mine and filed it in my engine's and prop's documentation.
__________________
Scroll
Sid "Scroll" Mayeux, Col, USAF (ret)
52F NW Regional/Aero Valley Airport, Roanoke TX (home of DR's Van Cave)
"KELLI GIRL" N260KM RV-7A tipper
Catch her on YouTube's "Because I Fly!" channel
Exemption waived.
Proud and grateful 2020 -=VAF=- Contributor
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04-23-2019, 05:19 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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Check the application guide on the Hartzell website:
http://hartzellprop.com//services/pr...ication-guide/
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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04-23-2019, 05:27 PM
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Join Date: Jan 2005
Location: NC25
Posts: 3,507
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What blades are on your Hartzell prop? The TCDS should have most of the info you are looking for.
Different blades have different RPM yellow zones.
The old F7666 blades have a yellow zone to avoid continuous operation
between 2000 and 2350 RPM.
The F7496 blade also have some limitations. I think there was a time limit at 2700 RPM only for takeoff plus some manifold restrictions in addition to other limitations.
The F7497 blade was the most desirable blade but I do not remember what if any limitations existed.
Most of the Hartzell metal props had limits when using higher compression pistons and electronic ignition.
__________________
Gary A. Sobek
NC25 RV-6 Flying
3,400+ hours
Where is N157GS
Building RV-8 S/N: 80012
To most people, the sky is the limit.
To those who love aviation, the sky is home.
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04-24-2019, 06:57 AM
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Join Date: May 2007
Location: Inver Grove Hgts, MN
Posts: 329
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Quote:
Originally Posted by RV6_flyer
The old F7666 blades have a yellow zone to avoid continuous operation between 2000 and 2350 RPM.
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That should be 2000 and 2250 RPM. I have those blades and 180 HP.
__________________
Mike Hilger
RV-6 N207AM w/G3X, 1,600 hours +
South St. Paul, MN (KSGS)
A&P, EAA Tech Counselor
We're all here because we're not all there...
Last edited by rvsxer : 04-24-2019 at 07:06 AM.
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04-24-2019, 09:22 AM
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Join Date: Mar 2008
Location: Anacortes, WA
Posts: 823
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Vans IO360-M1B and Hartzel
Conclusion:
I did submit inquiry to Hartzell and received quick email reply say, "No restrictions for the 180HP YIO360-M1B with HC-C2YR-1BFP prop on my RV. I
And the Application Manual 159 (shared on this thread earlier) verifies this to be true also. So great, for those who bought "standard" IO360 engine and CS prop combo from Vans there are no RPM restrictions.
Thanks for the help.
__________________
Steve Lynn
RV-7A
Flying Phase I
Anacortes, WA
www.mykitlog.com/sglynn
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04-25-2019, 07:09 AM
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Join Date: Nov 2010
Location: Okanagan Valley BC, Canada
Posts: 483
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Are there any restrictions on Catto props?
__________________
Ron Townson
Okanagan Valley BC, Canada
RV-8 Completed Dec 2013
Membership renewed Sept 8, 2019
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