Anyone know of any composite EDF jets comparable to a turbine jet? - Page 2 - RC Groups
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May 03, 2008, 03:53 AM
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Eddie P's Avatar
Worst case scenario, you might be able to pick up JetA at the local field for 4 bucks a gallon. Or less. If you get to know the fuelers... they have to purge the fuel trucks every so often. The fuel that is tested and purged - and it's a lot of it on occasion as far as what a P-70 can burn in a year - has to be recycled and it costs them money to do so. It's perfectly good fuel. If you give them a few 5 gallon drums you might be able to get it for "cheap", as in the cost of a few cups of fancy coffee for the boys.
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May 03, 2008, 03:10 PM
Beer me!
Slime-Lover's Avatar
Quote:
Originally Posted by k_sonn
For the sake of discussion, let's do some cost comparisons. The batteries you refer to cost $695 per set. Batteries, if properly taken cared of, will give about 150 cycles (flights). The cost per flight is $4.63 (695 / 150). The current cost of kerosine is $36 for 5 gallons. Turbine oil cost $29 per quart so the cost of 5 gallons of kerosine is $65. I have a kero-start (no propane needed) Jetcat P-70 powered airframe that burns 74 ozs of fuel per flight. 5 gallons equals 320 ozs so for 5 gallons of fuel I get 4.3 flight (320 / 74). The cost per flight is $15.12 (65 / 4.3). So, it costs me 3.27 times more per flight to fly a P-70 powered airframe than it does to fly the Comp ARF Spark.

Kirk
Not to be too anal but 5 gallons = 640oz (not 320). Add the 32oz of turbine oil and you have 672oz of fuel at a cost of $65. Your cost per flight then comes to $7.14 (not $15.12). Things are looking up for you now. I just saved you $7.98 per turbine flight!
May 03, 2008, 04:22 PM
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k_sonn's Avatar
You're right. I was thinking in terms of gallons and doing the math in terms of 1/2 gallons. But reguardless, the point still holds true. At this time in my area, it is still cheaper to fly EDFs

Kirk
May 03, 2008, 04:40 PM
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Eddie P's Avatar
I still think you could get it down to 3 to 4 bucks a flight if you bought JetA by the gallon in an expensive area. But even if turbine were to be cheaper than big EDF it doesn't necessarily mean it's better to fly turbine. Big EDF is fun, and it's still a mental challenge in a good way. And it's the happening place to be for those that like to push the limits forward on technology.
May 03, 2008, 04:48 PM
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k_sonn's Avatar
Quote:
Originally Posted by Eddie P
But even if turbine were to be cheaper than big EDF it doesn't necessarily mean it's better to fly turbine. Big EDF is fun, and it's still a mental challenge in a good way. And it's the happening place to be for those that like to push the limits forward on technology.
I'm with you
May 03, 2008, 05:02 PM
Registered User
Quote:
Originally Posted by rjp0325
John,

What is your best guess as far as MPH for the F-16 and F-100? Also, are the jets capable of 3-D flying as set up?

Thanks

Ralph

I would guess about 160 to 170mph on the F-16, the F-100 we are still waiting for Ken to deliver them.

John
May 04, 2008, 02:34 PM
Permanently Banned
get the hi-efficiency E-FLUX edf system from TAM using lighter LIPO packs
May 04, 2008, 02:41 PM
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Speed is Life's Avatar
Quote:
Originally Posted by rjp0325
John,

What is your best guess as far as MPH for the F-16 and F-100? Also, are the jets capable of 3-D flying as set up?

Thanks

Ralph


I'd guess that Ken's K&A F-100 will be a 90-130mph airplane depending upon power system.

3D???......Jets??? That's like putting a ballerina costume on a Kentucky Derby horse and wanting it to dance
There are some big$$$ turbines with vectored thrust that do that though.
..........I fly jets that fly like a jet............

-Mike
May 04, 2008, 03:17 PM
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turbonut's Avatar
Dont forget that you cant fly turbine at all fields..We only have three that I know of in socal..So you can factor in drive time to get to one I can fly at..So now there is the 4 bucks a gallon for car fuel to get there..I have to drive an extra 1/2 hour to fly my turbine power jets..
May 04, 2008, 04:24 PM
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why would anyone wanna do 3D on a jet designed for speed up to 200mph
May 04, 2008, 04:39 PM
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Lynxman's Avatar
Quote:
Originally Posted by hall woo
why would anyone wanna do 3D on a jet designed for speed up to 200mph
Hehe. Ask the russians. I got a propaganda mail a few weeks ago with a link to a video of an SU-35 or whatever doing impressive low speed 3D-like maneuvers (I call them sitting duck maneuvers).
May 04, 2008, 04:40 PM
Tear down the WALL!
ralf dvorak's Avatar
Quote:
Originally Posted by rjp0325
What I'm ultimately looking for is a screaming fast non-foamie EDF with retracts.
(with which you can do something else, too, other than speed?)

Get yourself an El.Bandito.

cheers,
RD
May 04, 2008, 11:51 PM
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GIMP EDF's Avatar
Quote:
Originally Posted by rjp0325
Does anyone have or know of composite EDF jets that is comparable in speed and performance to a turbine jet?
Yea I have and know of some, but you still get better performance by going to the Dark Side.

Gene
May 05, 2008, 10:31 PM
Effumall
kelberts's Avatar
Liquids in the airframe -- how 1990s ---
May 06, 2008, 09:27 AM
Registered User
Quote:
Originally Posted by hall woo
why would anyone wanna do 3D on a jet designed for speed up to 200mph

Boredom? (I like twiddling them sticks )

Ron
Last edited by Ron Pogue; May 06, 2008 at 09:30 AM. Reason: clarification


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