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Author Topic: Sport Jet  (Read 820 times)

Offline Robert Bolton

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Sport Jet
« on: September 25, 2007, 03:31:38 PM »
Well all things going well I will test fly my new sportjet this weekend Just a quere whats a good starting point for the metering jet on a sidewinder???  Model weighs in at just under 28 oz's

Thanks in advance
Robert Bolton

ps: The new fastjets for next year are under construction and should raise a few eyebrows  8)
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Offline dynasoar1948

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Re: Sport Jet
« Reply #1 on: September 26, 2007, 09:06:23 AM »

Nice looking airplane, Robert.  I'm not certain about metering jet size for sidewinders, since all my Sport-Jets (both of them) have been uprights.

What lines do you use?  Length, and engine centerline offset from the outboard end of the uniflo breather will all affect centrifugal fuel head and ideal m-j size.

Best of luck,

Will Stewart
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William Stewart

Offline jetbill40

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Re: Sport Jet
« Reply #2 on: September 26, 2007, 09:09:29 AM »
Robert on sidewinder with a Bailey about a .048    JB
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William Capinjola

Offline jetbill40

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Re: Sport Jet
« Reply #3 on: September 26, 2007, 09:12:26 AM »
Robert also that vent line looks a little big is that 1/16 OD         JB
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William Capinjola

Offline Robert Bolton

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Re: Sport Jet
« Reply #4 on: September 26, 2007, 05:52:03 PM »
JB thanks for the metering jet size...  The vent pipe is copper so has a smaller ID but is the same as the ID of 16th OD brass tube. Hopefully the wind dies down so we can go flying this weekend..  #^

Robert

ps: line size over here is 0.8 monoline or .5mm 2 line  with 19.9 m length  or 65 feet. there is no different class for sport or fastjet.. This model is going to be set up to fly on your 60 feet lines as thats what its going to flown on at your nats
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Offline Jim Rhoades

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Re: Sport Jet
« Reply #5 on: September 27, 2007, 04:08:20 PM »
Robert,

My TARFU Sport Jet normally uses a .043 or .044" metering jet.  Nice looking ship.  I'm looking forward to hearing your flight report.  I've been thinking real hard about starting a TARFU Fast Jet.  Joey needs something else to hang on too.  I'll probably have him do the check out flights at least.

Jim Rhoades
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Offline dynasoar1948

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Re: Sport Jet
« Reply #6 on: September 27, 2007, 04:42:06 PM »
Robert,

The change in fuel flow resulting from head pressure difference,  between 60 and 65 foot lines, is just under 10%. THis is assuming the same speed and metering jet.

Will
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William Stewart

Offline Robert Bolton

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Re: Sport Jet
« Reply #7 on: September 30, 2007, 01:18:38 AM »
Wet and windy today so no good for testing or any flying will have to wait till next weekend  HB~>  At least it gives me more time to build ..
Robert
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