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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> Jett Engineering Support >> 46vs 50vs60
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46vs 50vs60 - 11/21/2006 3:30:05 AM   
luv2flyrc



Posts: 338
Joined: 1/7/2002
From: Mississauga, ON, CANADA
Status: offline 		Hi Bob,

Looking for an engine for my Juno F20. Have decided Jett is the way to go. Will I see a significant difference in speed on this airframe when comparing your 46,50 and 60lx?

Kind Regards,
Mike

       Post #: 1

RE: 46vs 50vs60 - 11/21/2006 2:51:24 PM   
bob27s



Posts: 4625
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline
quote:

ORIGINAL: luv2flyrc

Hi Bob,

Looking for an engine for my Juno F20. Have decided Jett is the way to go. Will I see a significant difference in speed on this airframe when comparing your 46,50 and 60lx?

Kind Regards,
Mike


Hi Mike,

Thanks for writing...

The basic difference between those engines is you gain appx 500 rpm with each size, on a 10x6 prop (baseline). The 60LX is by far the most powerful "40" size engine on the market - that engine will turn the 10x6 up around 18,000 with ease.

Of note, the 60LX now features a gold muffler, similar to the larger 90LX engine (web site still shows the original Red SS muffler - just in case that matters)

Using the 60LX compaired to the SJ-46 will probably get you about another 10-15 mph on the top end, depending on how you prop it. There are quite a few of these planes flying with SJ-46 and SJ-50 power - and they move quite nicely - so not much to sacrafice there if you go that route.

The SJ-46 and SJ-50 engines are extremely user friendly. Idle great, somewhat broader prop selection (rpm range) to work with, start on the first flip usually, and easy to set the needle.

The SJ-60LX is very similar, but with a higher rpm band to work with (prop selection is important), and it takes a little bit more of your attention in setting it up initially - although not much more. So I tend to be realistic and say that this engine is about 90% as user friendly as the

The Juno F-20 is an outstanding plane. Be sure to build it with retracts. That is a huge gain in speed over fixed gear.

If you use any of the Jett engines, be sure to use a bubble-jett or a tetra bubble-free fuel tank (simply solves some fix/foam possible issues right from the beginning)

On the F-20, the 10x6 apc is a good starting point for all-around performance. Also a standard blade 9x8 will work with any of the engines, and the SJ-50 and 60LX can also turn a 9x9 quite nicely too.

I hope this is helpful

Bob Brassell


_____________________________

Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

(in reply to luv2flyrc)
       Post #: 2

RE: 46vs 50vs60 - 11/21/2006 7:50:17 PM   
luv2flyrc



Posts: 338
Joined: 1/7/2002
From: Mississauga, ON, CANADA
Status: offline 		Bob,

That's very helpful info,

Thank you

Kind Regards,

Michael Block

(in reply to bob27s)
       Post #: 3

RE: 46vs 50vs60 - 11/21/2006 7:59:38 PM   
bob27s



Posts: 4625
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline 		Glad to be of service...

btw..... email to jett2006@jettengineering.com and requst the "hangar sale" list. Sometimes that can help you decide on which engine


_____________________________

Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

(in reply to luv2flyrc)
       Post #: 4

RE: 46vs 50vs60 - 12/12/2006 2:41:14 AM   
luv2flyrc



Posts: 338
Joined: 1/7/2002
From: Mississauga, ON, CANADA
Status: offline 		Bob, I went with the jett 50, ordered it today. Dubb said he's running at about 5 weeks lead time right now, that's ok as it's mid winter here in the Toronto area. I look forward to running it this spring

Mike

(in reply to bob27s)
       Post #: 5

RE: 46vs 50vs60 - 12/12/2006 2:54:20 PM   
bob27s



Posts: 4625
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline 		Hey... good to hear it

Yeah, the weather here in Cleveland isnt much better. Although Id like a nice snowy day, followed by 35 degress and calm winds so I can get out snow flying for a while !

Bob


_____________________________

Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

(in reply to luv2flyrc)
       Post #: 6

RE: 46vs 50vs60 - 12/14/2006 10:59:04 PM   
luv2flyrc



Posts: 338
Joined: 1/7/2002
From: Mississauga, ON, CANADA
Status: offline 		Hi Bob,

I came across an APC 9x 8.5 comp. prop, hub is marked D1 in the LHS. Bit of a different shape to it, I'm assuming this is a pylon prop. Is it a good one to run on the 50?

Thanks

MIke

(in reply to bob27s)
       Post #: 7

RE: 46vs 50vs60 - 12/18/2006 3:03:54 PM   
bob27s



Posts: 4625
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline 		the 9x8.5 was somewhat of an oddity prop - was too much for the engines available when it came out - not many folks used it for racing, but it will work fine on your SJ-50 for sport use

It is a bit bigger blade than the current 8.75x9W or 8.8x8.5 - better static pull, will help with launch/take-off


_____________________________

Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

(in reply to luv2flyrc)
       Post #: 8

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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> Jett Engineering Support >> 46vs 50vs60
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