Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Jett fuel consumption

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Old 02-16-2007, 06:23 AM
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vasek
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Default Jett fuel consumption

Hi,

is there a fuel chart for the Jett engines (sx 50, 60LX, 90LX)?

I am always searching for data when choosing an engine/ fuel tank/ for a project

Right now I want to find info on how much fuel the 60LX needs for full power run for 10 a min flight

Thanks for the info,
V.
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Old 02-16-2007, 10:42 AM
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Cyclic Hardover
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Default RE: Jett fuel consumption

Too many variables to get accurate numbers. I have a 20oz in my 60size Ultra Sport with a Jett90. Not that I need it but I like having plenty of fuel.
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Old 02-16-2007, 10:44 AM
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Default RE: Jett fuel consumption

nope, there is no chart.

The 60LX burns just about the same fuel at full throttle as the 428 engine. With a 8.8x9 prop, roughly 19,000 rpm, figure on 1.5 oz per minute. We can typically start, launch, fly for about 4 minutes total on a 6oz fuel load in the Q-500 - that would be letting the tank run dry (usually you want to shut off before that).

Bubble-Jett or Tetra bubble tank will give you the best fuel usage for a given size tank, since you can use 100% of the available fuel. Conventional tanks - consider 20% of the fuel capacity as un-usable fuel (foam/air/lean danger zone)

On the 60LX, throttle back a bit when possible (starting, take-off, turns, downlines, etc) and you can get a bit more air time. So for 10 minutes of typical sport flying operation (start to shutdown) you can get away with a 12oz-14oz tank.

SJ-90L burns just about 1.8 oz per minute at full throttle.

90LX burns about 2 oz per minute at full throttle.

SJ-46 and SJ-50 with the standard jett-stream muffler (stock piece) burn closer to 1.3 oz per minute.

Just as a reference here ---- your milage (minutage?) may vary
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Old 02-16-2007, 11:55 AM
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Default RE: Jett fuel consumption

Thanks BOB, that means a 18oz for my LX60 sounds just about right

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