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Ron Schreck
Joined: 10 Jan 2006
Posts: 94
Location: Gold Hill, NC
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 Posted: Sun Sep 24, 2006 8:33 pm Post subject: Adjusting Propeller RPM |
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I have a WhirlWind 200RV prop, which uses a McCauley hub and an old Hartzel F-series controller. The best RPM I get on takeoff is 2640 and I don't know how to adjust the maximum RPM. The controller doesn't seem to have any adjustment except a stop-screw on the cable arm. This screw is all the way out, so no help there. Is there some adjustment available on the prop hub? Any help would be appreciated.
Ron Schreck
RV-8 "Miss Izzy"
Gold Hill Airpark, NC
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khorton01(at)rogers.com
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| Posted: Mon Sep 25, 2006 1:59 am Post subject: Adjusting Propeller RPM |
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On 25 Sep 2006, at 24:17, Ron Schreck wrote:
| Quote: | I have a WhirlWind 200RV prop, which uses a McCauley hub and an old Hartzel F-series controller. The best RPM I get on takeoff is 2640 and I don't know how to adjust the maximum RPM. The controller doesn't seem to have any adjustment except a stop-screw on the cable arm. This screw is all the way out, so no help there. Is there some adjustment available on the prop hub? Any help would be appreciated.
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Do you get 2700 rpm during climb or at higher speed? If so, the lower rpm during takeoff is probably because the prop is at its low pitch stop, which is set in the hub somehow.
If you can get 2700 rpm during climb and higher speeds, I would be tempted to leave it alone. The performance improvement you would get during takeoff from the extra 60 rpm is likely not important, and making the low pitch stop finer will result in more windmilling drag following engine failure - not good.
If you are limited to 2640 at all speeds, then it is a prop governor (or tachometer) issue, and all the above does not apply.
Kevin Horton RV-8 (finishing kit)
Ottawa, Canada
http://www.kilohotel.com/rv8
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