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Old Jun 20, 2011, 01:26 AM
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jefffassbinder's Avatar
United States, CA, Chino Hills
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L-39 Fly Eagle EDF Project

Well I thought I would ask before I ROG. I have a L-39 ready to fly. But using stock ducting. I have a few options on fans DS-94, TJ-120, Dynamax 127, but what I was wondering is if someone has done a good layup of ducting on this model. Not that it needs more weight at AUW is 24lbs with 6800 on tap at 12s. Well I hoping that I will get a chance at breaking the 12s barrier shortly but that is a big issue.

Well if you have ducting let me know I'd like to see yours and get some ideas on how you did it and or if it is available for any of the above fan units.
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Old Jun 20, 2011, 07:56 AM
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Fontana, California, United States
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I think yours will be the first Jeff I'm sure it has flown as electric, but can't think of anyone who has made ducting for it?
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Old Jun 20, 2011, 09:17 AM
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Show some pics of this Bad Boy
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Old Jun 20, 2011, 10:19 AM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
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Jeff we have one, but have not yet made the ducting for it. The Dynamax does fit, but the inlets are only about 80% FSA.
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Old Jun 20, 2011, 10:29 AM
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80% is about like my A-4 Doesn't seem to be an issue at all in the air.
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Old Jun 20, 2011, 09:51 PM
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Ducting

Well, glad to here Jim has one. I here you about the 80% Bob. Well I was hoping that someone may have done some ducts just to get some ideas. I due currently have a 120 unit in there and a extension that goes from the inlets to this extension. It is not smooth as I would like but it can pull air. Well not sure about your Jim but I'm at 24 AUW 6800s 12 full doors, wheel, brakes the works on this model but I'm a 24. I flew my BAE this past weekend and it is at 20 lbs but has a lot more wing.

Jim have you rotated yours yet. Interested in the CG at 105mm from leading edge is this the sweet spot?

Well I'm ready to go as I just made a very tight fitting exhaust duct 120mm down to 90+- about 3.5" as I want a little more static as this thing is going to require a heavy hand and hold throttle.
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Old Jun 20, 2011, 11:42 PM
Fly allot, Crash allot, next?
United States, CA, Corona
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Kick ass Jeff, I'm sure you can make it go.

Post some pictures, please.
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Old Jun 21, 2011, 12:33 AM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
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We have not finished ours yet. It turned out about 22 pounds with 6S5000mAh packs and Scott freaked. So, I will end up finishing it. Weight is very over-rated. All of our big aircraft are 90oz square foot (even as turbines), so it's not a big deal.
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Old Jun 21, 2011, 12:54 AM
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Here are a couple of pictures of this bird ready to ROG

Fly Eagle L-39 ready for some more testing and shake down. I will do a couple of runups to test the intakes and also see what kind of watts I'm able to achieve with this intake ducting system. I'm at 80-85% fsa but my ducting flow is not the best possible. But that won't stop me from trying.

If a Salamander will fly at 20 pounds and it has as short of wings if not shorter so this thing should fly just need to keep the speed up.
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Old Jun 21, 2011, 06:12 AM
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Nice project, I hope flyeagle have changed there steering mechanism. my rafale's nose leg needed a mod to prevent it from turning when it was retracted. the last thing you want is the nose leg turned sideways when landing.
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Old Jun 21, 2011, 08:21 AM
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Wow Jeff she's a real Beauty!! I'll be at Prado Sat about 1pm. Can't get there any earlier cause my son has football practice till 11am, but I'm bringing my A-4 and Spitfire, and a bunch of stuff Blake flies. We are going to do a BBQ as well We're staying till dark and doing some foamy night flying The A-4 has 39 flights on it now It's almost time to replace the rubber on the mains
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Old Jun 21, 2011, 09:09 AM
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corsair nut's Avatar
tehachapi, CA
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very nice jeff!!!

BTW, i like that eronaught panther. those things fly very nice!
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Old Jun 21, 2011, 09:38 AM
EDF all the way!
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Gilbert, Az
Joined Jun 1999
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Jeff,
Looks great!
Bob
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Old Jun 21, 2011, 10:24 AM
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Brentwood, California
Joined Jul 2007
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Looks great Jeff
I believe this is the 1/6.5 scale? not the bigger 1/4?

If so Marvin and Tam did a conversion on the 1/6.5 scale global jets/fei bao L-39. It's pretty close in size to yours...

your is 71" long with a 54" wing Marvins is 76" long with a 57" wing

It looked to fly well on just 11s and 4300 watts with a TJ 100..... so if yours is the smaller version I'm sure it will fly great.

Tam has ducting but for a 100mm fan so that won't really help you much

hope it goes great for you, here is a video of Marvins:

Global Jet Club Fei Bao 1/6.5 Scale ( TJ100HP EDF Converted ) L-39 (6 min 22 sec)
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Old Jun 21, 2011, 10:36 AM
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Yeah I forgot Marvin did that one.
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