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        Depron JSF F35 :or my first EDF

#1 Mr. Boogie Nov 23, 2004 07:01 PM

Depron JSF F35 :or my first EDF
 
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I now feel like I'm far enough along to show my current project. This build is inspired by great work demonstrated by my fellow ezoners. I can only hope to one day be as good as they are ;) .

and...

By the desire to try my hand at an EDF model. If this doesn't work I can always buy a FS F16 to learn on :D .

Materials:
I'm using 3mm Depron and Blucore (It's still a foamie after all!)
Some 1/16 lite ply.
Foamsafe CA
5 min epoxy
1/8" carbon tube, and slightly larger aluminum tube


I used Rhino and 3 views to generate a planform based on the F35 C model.
3mm depron is used for most of the plane, Blucore FFF used for some formers and motor mount.

Stats:
Wemotec Microfan/Astro 010 combo.
3S TP 1320 Lipo
21 inch wingspan. Full (semi-symetrical) airfoil.
Estimated AUW is 10 - 11 ounces ready to fly.

With the top off, holding the plane 3 inches above my digital scale I see 10oz static thrust. I expect this to decrease when I close the top up, but it looks promising.

Edit: Plans are here

Edit: Video here

Many thanks to Rcparkflyer for hosting.
Mr. Boogie

#2 Tomcat Fan Nov 23, 2004 07:04 PM

Looks pretty sweet.

Glad to see you went with such a basic, conservative design for your first scratchbuild.

We call that sarcasm.

Pretty sweet looking plane, though.
Good luck with it.

#3 Mr. Boogie Nov 23, 2004 07:04 PM

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Controls will be full flying tailerons motivated by 2 JR 241 servo's.

#4 Mr. Boogie Nov 23, 2004 07:13 PM

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I'm using a semi ducted setup:

I've got a duct with a vacuum formed intake lip midway into the fuse.
The duct intake lip has a 5mm radius.
The intake tube is heavy photo paper and the efflux cone is cut transparency sheet.

Lining the walls of the fuse and also acting as structural supports for the top fuse is a funnel of sorts. Time will tell if this setup works, but it allowed me to quickly and painlessly duct this plane.

Pic One is the vacformed intake ring
Pic Two is the thrust cone
Pic Three shows the psuedo ducting

#5 Mr. Boogie Nov 23, 2004 07:20 PM

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Thanks Tomcat,

It's actually not my first scratchbuild, just my first EDF bird. I've done a few pusher jets and a couple of warbirds.

I forgot to mention that the fuse and wings are folded single sheets of depron, I am trying to minimize adhesive use and hopefully keep my weight down.

The wing tubes slide into the center former, which is a depron/ply sandwich.

#6 AirX Nov 23, 2004 07:27 PM

Nice work Mr. Boogie.. :)

Eric Barnett

#7 Ralph A. D'Amelio Nov 23, 2004 08:34 PM

Fantistic craftmanship......good luck on the maiden

Ralph

#8 rcjetpilot Nov 23, 2004 08:54 PM

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Mr Boogie,

You must be bursting at the seams:) Very nice indeed.

The wing section is very cool, the semi-symetrical root section transforms to a symectrical section effectively creating a mild amount of washout. Should work very well. If you meet your 10-12auw target you'll have a big winner!

I'm working on a slightly larger mini480 thing:)

Bob.

#9 Mr. Boogie Nov 24, 2004 07:55 AM

Thanks AirX, Ralph, and RCjetpilot,

I'll be tossing her about trying to find the CG, and would like to maiden this weekend weather and family permitting.

Mr. B

#10 Mr. Boogie Nov 24, 2004 08:03 AM

Quote:

Originally Posted by rcjetpilot
Mr Boogie,

I'm working on a slightly larger mini480 thing:)

Bob.

Rcjetpilot,

That slightly larger mini480 thing, wouldn't happen to be a F35 or F22 would it?

I followed your F22 build and even though you shelved it thought the thread and craftsmanship were top notch.

Mr. Boogie

#11 Stefan lamers Nov 24, 2004 09:12 AM

Hi mr boogie
Looks very nice, i'm very curious how your first EDF will perform. Sofar i have only built propellor planes but i would like to make the step too.
greetings
stefan

#12 Tomcat Fan Nov 24, 2004 10:01 AM

This is just looking truly beautiful, Boogie.

#13 rcjetpilot Nov 24, 2004 12:24 PM

Mr Boogie,

The pictures are from a F-2 "Super Falcon" which survived one flight due to rx glitching. I knew better then to fly but.... Lesson learned. AUW 43 ozs and had 245sqr wing area. Wing loading was quite good with 12 faups but I never did get a chance to see how foam holds up when landing normally:)

I'm conviced that fff is good build material but only up to a AUW weight of 30oz. And I'm equally convinced that my raptor will only last for few flights simply from the weight of 12 FAUPS. So I shelved it until a time when I'm bored:)

So the mini480 thing is a smaller sport version of the original F-2. As soon as I finish up my remodeling work-build room its first on list.
http://www.rcgroups.com/forums/showthread.php?t=298399

I'm really looking forward to watching your project.

Bob.

#14 Mr. Boogie Nov 26, 2004 08:34 PM

Quote:

Originally Posted by Stefan lamers
Hi mr boogie
Looks very nice, i'm very curious how your first EDF will perform. Sofar i have only built propellor planes but i would like to make the step too.
greetings
stefan

Believe me Stefan, I am more curious than anyone right now concerning the "flyability" of this plane. It should be a great learning experience one way or the other.

Mr. Boogie

#15 Mr. Boogie Nov 26, 2004 08:47 PM

Tomcat,

Thanks again, where in NY do you fly? I grew up in Brooklyn, NY but now call NJ my second home.

RcJetpilot,

I wish my garage was as neat as your's now is, my garage and dining room are overun with plane related items.

Update
Hope everyone enjoyed thier Turkey Day, I didn't get much done except for closing up the top of the F35. My templates were a little oversized and needed to be trimmed (no big deal).

My AUW as measured by my trusty digital scale is 10.5oz. With the top open and the thrust/efflux cone attached, I measured 10.2oz of static thrust. Sealing the top and measuring thrust in the same manner, I see 9.5oz of static thrust (we don't need no stinking cheater holes! :D ). This should be more than enough to get/stay airborn, I'm still trying to determine a good conservative CG point and initial control throws.

Mr. Boogie


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