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