BillO

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

paolino1818

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.

bob27s

My Feedback: (19)

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 ?

paolino1818

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

bob27s

My Feedback: (19)

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.

paolino1818

Thanks alot Bob. I think your right.