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brad hammond
Joined: 20 Jun 2007 Posts: 18
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Posted: Thu Jul 17, 2008 12:08 pm Post subject: Beech Electric prop |
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I have recently found a used beech electric 88 prop for sale to install on a friends 47. But this prop happens to have clipped blades cut down and squared. Does anyone know if this is a legal mod, and if so what difference it makes in the performance of the prop |
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brad hammond
Joined: 20 Jun 2007 Posts: 18
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Posted: Thu Jul 24, 2008 1:54 am Post subject: |
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I have discovered rumor that after the 225 change people could either buy a 84" square tip prop or cut down the 88" in order for the prop to handle the higher RPMs. Anyone else heard this rumor or have anything to add? |
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VinceGlorioso
Joined: 25 Feb 2008 Posts: 16 Location: Fort Myers, Fla.
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Posted: Fri Jul 25, 2008 6:36 pm Post subject: (Clipped) 84" propellor can not legally be used on the |
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Sorry, not sure of which exact electric propellor you have, it does not matter, as the shortest legally permissible electric prop for the straight 35 is 86 1/4 inches.
This goes for the R203, B200, and 215-series of Beech propellors.
It is legal to "shorten" the 215-series prop all the way down to 82", but that is too short to use on a 35.
The reasons (and there are many) NOT to clip the 88" propellor are:
A loss of efficiency (longer is better)
A loss of smoothness (more spinning mass=smoother)
A loss of engine braking during descents
and, of course, once you clip the metal it can never be put back.
I do understand that you were not responsible for the shortening, of course.
I have a C35 with an E-225-8 and the 215 electric prop with 88" blades, I wouldn't change to shorter blades for the few extra hp I would develop for all of 10 seconds a flight as I transition from liftoff through gear retraction.
And the prop is type certificated (P-973) for 285 hp on takeoff, 275 hp continuous, regardless of blade length, it's not a matter of handling it, it's whether or not the prop "allows" the engine to develop the full horsepower. _________________ o--\O/--o |
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brad hammond
Joined: 20 Jun 2007 Posts: 18
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Posted: Sat Jul 26, 2008 12:37 pm Post subject: |
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Do you know what the average selling price of a used 88" electric 215? |
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VinceGlorioso
Joined: 25 Feb 2008 Posts: 16 Location: Fort Myers, Fla.
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Posted: Sun Jul 27, 2008 1:07 am Post subject: Used electric prop price |
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I have heard from $2000-$3000 for used 215 props.
I also know from personal experience that is costs about $1500 to get the prop pitch change motor overhauled, and our pitch change bearing servicing is $800, plus another $400 for the stripping and repaint of the blades that we do every four years.
There was a NOS Hartzell propellor for sale on eBay for $4000, never installed, complete from the crankshaft forward. _________________ o--\O/--o |
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