|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

11-24-2009, 02:11 AM
|
|
|
|
Join Date: Aug 2005
Location: Lockwood (8 miles east of Reno), Nevada
Posts: 85
|
|
Pros or Cons: Full feathering Hartzell hc92zk-2B 8447-12a
Does anyone have any comments about mounting a full feathering Hartzell prop from a Twin Beech Travel Air to a O-360A1D on an RV-8? The Travel Air cruise speed is about the same as an RV-8....I think? Don't know about the prop governer though? 
|

11-24-2009, 11:54 PM
|
|
|
|
Join Date: Jul 2009
Location: New Zealand
Posts: 54
|
|
Is there a particular reason your thinking of full feathering? have you got a deal on it?
|

11-25-2009, 03:47 AM
|
 |
|
|
Join Date: Jan 2005
Location: Ottawa, Canada
Posts: 2,357
|
|
Quote:
Originally Posted by Doug Rodrigues
Does anyone have any comments about mounting a full feathering Hartzell prop from a Twin Beech Travel Air to a O-360A1D on an RV-8? The Travel Air cruise speed is about the same as an RV-8....I think? Don't know about the prop governer though? 
|
Having a full feathering prop would buy you a small amount of glide performance improvement, but adds a new failure mode. If the prop governor fails, the prop will feather. Personally, I would prefer to not have a feathering prop, unless I had a multi-engine aircraft.
|

11-25-2009, 05:08 PM
|
|
|
|
Join Date: Aug 2005
Location: Lockwood (8 miles east of Reno), Nevada
Posts: 85
|
|
It's a good deal.....but....
I've been talked out of it. Too many unknowns and maybes, plus no aid in slowing down with the power pulled way back. It was just a consideration of getting a prop cheap and into the air faster.
|

11-25-2009, 05:56 PM
|
 |
fugio ergo sum
|
|
Join Date: Apr 2006
Location: Carlsbad, NM
Posts: 1,912
|
|
Quote:
Originally Posted by Doug Rodrigues
I've been talked out of it. Too many unknowns and maybes, plus no aid in slowing down with the power pulled way back...
|
It would still have the braking effect of any other CS prop.
__________________
Larry Pardue
Carlsbad, NM
RV-6 N441LP Flying
|

11-25-2009, 07:27 PM
|
 |
|
|
Join Date: Jan 2005
Location: Ottawa, Canada
Posts: 2,357
|
|
Quote:
Originally Posted by Doug Rodrigues
... plus no aid in slowing down with the power pulled way back.
|
As long as the engine is developing oil pressure, and the prop governor, oil line to prop, etc are serviceable, it will work like any other constant speed prop. I.e. the prop governor will control the blade pitch to attempt to keep the rpm at the selected value. So, if you pull the power back, the rpm will fall, and the prop will go to fine pitch. Exactly the same as any other constant speed prop.
|

12-01-2009, 09:19 PM
|
|
|
|
Join Date: Aug 2005
Location: Lockwood (8 miles east of Reno), Nevada
Posts: 85
|
|
Just got information from a Hartzell engineer....
**He said that the feathering prop is 20 lbs heavier that the Hartzell compact hub with the 7666 blades. Didn't know that. 
|

12-01-2009, 10:16 PM
|
 |
|
|
Join Date: Jul 2009
Location: Wilsonville, OR
Posts: 453
|
|
You'll get a surprise when you accidently run out of gas on the right side and it feathers before you can switch. Just hypotheticals but I really don't think its a good idea to have a fully-feathering prop on a single-engine piston.
__________________
________
Trevor Conroy CFII, MEI
Airbus Pilot
N781TD
RV-7
First Flight - April 12, 2015
Construction Log
|

12-02-2009, 12:24 AM
|
 |
|
|
Join Date: May 2005
Location: Santa Barbara, CA
Posts: 1,324
|
|
Won't feather by itself
Quote:
Originally Posted by TCONROY
You'll get a surprise when you accidently run out of gas on the right side and it feathers before you can switch. Just hypotheticals but I really don't think its a good idea to have a fully-feathering prop on a single-engine piston.
|
Doesn't work that way, you would have to pull prop control all the way back to feather even if the engine is just windmilling. Otherwise, the prop would feather every time you shut the engine down.
John Clark ATP, CFI
RV8 N18U "Sunshine"
KSBA
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 04:06 AM.
|