What prop for SJ50?  
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What prop for SJ50? - 11/16/2007 5:07:08 PM   
BillO


 

Posts: 9
Joined: 7/25/2006
From: London, ON, CANADA
Status: offline 		What prop(s) run well on the SJ50 for all around use?
I have:
8.8 x 8.75
8.8 x 9
8.75 x 9W
9 x 7
9 x 8

What props might be better suited for what type of application?

Thanks.
Bill

_____________________________

BillO
       Post #: 1

RE: What prop for SJ50? - 11/17/2007 2:15:00 AM   
paolino1818


 

Posts: 48
Joined: 6/5/2007
From: swedesboro, NJ, USA
Status: offline 		Hi Bob,
I figured id just add a related question to this thread. I have a BSE .50 and wanted to know if the engine can handle a 9X9 APC prop.

Thanks alot.

(in reply to BillO)
       Post #: 2

RE: What prop for SJ50? - 11/27/2007 4:17:46 PM   
bob27s



Posts: 4637
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline 		Hi,

Sorry for the delay...

You can use a 9x9 on the BSE-50, but it depends on the aircraft.....

Engine/prop/airframe are a combination that has to be balanced.

If the airframe is quick, and will allow the engine to unload easily in flight.... then yes, you can use the 9x9. Something like a Q-500 design, perhaps a diamond dust or similar fast delta, or a Magnum --- perhaps ok. A few have tried the prop on larger planes like the Patriot and smaller pattern ships..... mixed results.

Key there, still, is making sure you properly needle the engine ---- it will not peak at rpm quite the same. Always error on the rich side a bit ---- fly ---- lean out just a bit more if needed the next time. Keep note of the ground rpm you see. Alway back off 600-800 rpm from the ground peak rpm.

Keep in mind, the 9x9 will lug down the engine ---- do not expect it to be faster than a 9x8 in most applications.

Tell me a bit about the airplane you are powering with the BSE-50 ?


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Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

(in reply to paolino1818)
       Post #: 3

RE: What prop for SJ50? - 11/27/2007 6:16:51 PM   
paolino1818


 

Posts: 48
Joined: 6/5/2007
From: swedesboro, NJ, USA
Status: offline 		The engine is in a Phoneix F 20 tiger shark. I started with a 10x6. Than i went to a 9x8 and noticed a big increase in speed. I was just curious if a 9x9 would be even faster. What do you think the best prop would be?
Thanks alot

< Message edited by paolino1818 -- 11/27/2007 6:17:36 PM >

(in reply to bob27s)
       Post #: 4

RE: What prop for SJ50? - 11/27/2007 6:34:21 PM   
bob27s



Posts: 4637
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline 		Give the 9x9 a try.... worth a shot. Just be careful not to get the engine hot.

My guess is that with the fixed gear, the 9x8 is about as good as it is going to get.


_____________________________

Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

(in reply to paolino1818)
       Post #: 5

RE: What prop for SJ50? - 11/27/2007 6:49:03 PM   
paolino1818


 

Posts: 48
Joined: 6/5/2007
From: swedesboro, NJ, USA
Status: offline 		Thanks alot Bob. I think your right.

(in reply to bob27s)
       Post #: 6

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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> Jett Engineering Support >> What prop for SJ50?
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