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447 prop

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Herbgh(at)nctc.com
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Posted: Mon Jun 08, 2015 10:06 am Post subject: 447 prop

I received  three props with my California purchase.  Two blade 66 inch 

Ivo for 503 and 582.   and two blade 60 inch Warp.  And  a three blade 

medium(503 or better ) pitch, 68 inch ivo minus the quick adjust.. I 

need a three blade,ul,  60 to 62 inch IVO for the 447 on my Firefly...



   Also have a three blade electrically adjustable IVO with medium 

blades...60 inch..for 503 or 582?



   I notice that some are using the Warp with a b box.. some with 

hundreds of hours...  Thinking that I could use the 60 inch warp without 

the 2.5 inch extension..  What are the experiences out there...?  anyone 

have a trade?  privately of course...Maybe a two blade wooden prop?  Herb

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Richard Pike

Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee

Posted: Mon Jun 08, 2015 10:51 am Post subject: Re: 447 prop

2 blade 66" Ivo is good for a 503 and also 532 running a B box with a 2.58:1 ratio. A 2 blade 68" is great for a 582  running a B box with 2.58:1. Those are the combinations I have tried and found good, the others I have no opinion.

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_________________
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.

Herbgh(at)nctc.com
Guest

Posted: Mon Jun 08, 2015 12:38 pm Post subject: 447 prop

Thanks Richard



   Chatted with a fellow at Warp drive...very helpful and friendly...so 

is IVO...   and he said that the two blade 60 inch Warp is ok for the 

447 ...with b box...Herb



On 06/08/2015 01:51 PM, Richard Pike wrote:

 	  Quote: 	
		   



 2 blade 66" Ivo is good for a 503 and also 532 running a B box with a 2.58:1 ratio. A 2 blade 68" is great for a 582  running a B box with 2.58:1. Those are the combinations I have tried and found good, the others I have no opinion.



 --------

 Richard Pike

 Kolb MKIII N420P (420ldPoops)

 Kingsport, TN 3TN0

 There are two kinds of people: those who say to God, 'Thy will be done,' and those to whom God says, 'All right, then, have it your way.'





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wakataka

Joined: 11 Aug 2012
Posts: 48

Posted: Tue Jun 09, 2015 8:43 pm Post subject: Re: 447 prop

I run a 66" Warp drive on a B box behind a 377. It's a very smooth and extremely durable prop. But the Warp Drive prop is heavy. It likely has a moment of inertia more than the B gearbox is rated for. That said, if you just keep the idle speed up around 2,000 rpm you can avoid the damaging resonance that occurs at low speeds. This is true with any prop on a Rotax 2 stroke. That chatter you hear at low idle speed is the knuckle joint attempting to absorb the resonant energy pulses between the prop and the engine. You don't want to be hearing that sound on a regular basis. Just set the idle speed up until it goes way. A fast idle may have you moving faster than you'd like on the taxiway, but it's much cheaper to replace brake pads than gearbox parts. And I've never had a forced landing due to worn out brake pads.

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