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Old Nov 20, 2008, 03:46 PM
You sabotaged my plane.
eliworm's Avatar
Arizona
Joined Jun 2002
2,825 Posts
Discussion
F-104 Quickbuild

Here is a F104 that I have been working on for a few weeks. Test flight was this morning and it was successful enough I think that I can let the plans out for people to play with. It took a little to get to the success part. The test flight was crazy. It was not like anything that I expected. I thought it would be twitchy in the roll axis but it is rock solid there. I was way off in guessing the CG. I put it at the leading edge of the wingtip. Steve gave me a hand launch and it was crazy from there. Nose straight up climb and totally out of control. I got it up about 100 feet and fed in all the down trim and that didn't help. After hanging on the prop for about 30 seconds I throttled back and things got worst. I ended up behind everyone about 5 feet off the deck inverted, I rolled it around just as I flew into the sun and dumped it at that point. Landed hard but level and all was OK. The prop was running when I landed so I ended up spinning the prop nut off and loosing it. I installed a new nut and moved the CG forward. Steve launched again and it was night and day, smooth and controllable. I landed and adjusted again and all is good. Fast with a very fast but smooth roll rate. I need to explore the stall some more as it seems to be very deep when you get there, maybe play with the CG some more. Overall it seems very flyable. Landings are a surprise as well, slow with good flare authority. So, three flights made and coming home in one piece. On Friday I'll run it through some more tests. I have it setup with flaperons so I'd like to see how they work although I really don't need to slow it down anymore for landing.

Specs:
Wingspan 18 3/8 inches.
Length 43 inches
Motor Scorpion HK 2208-28
Prop 4.5 x 4.1
Battery used 1000 and 1300 X-caliber 3 cell
Material 6 mm depron

Edit: Added the tiled plans for download. Thanks Pat for the tiling the plans.

Jim
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Last edited by eliworm; Nov 02, 2012 at 09:59 PM. Reason: Added tiled plan
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Old Nov 20, 2008, 04:58 PM
My plans are in my blog
Rusty-Gunn's Avatar
Kotzebue, Alaska
Joined May 2006
5,416 Posts
Excellent. I've sometimes wondered if this plane might be differcult to make fly due to short wings, but obviously this is not the case.
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Old Nov 20, 2008, 05:07 PM
Flying Models for 51 Years!
Sixter's Avatar
Georgia, United States
Joined Oct 2002
819 Posts
COOL Pictures and a Video would be nice

Bobby
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Old Nov 20, 2008, 05:32 PM
Crash & Burn
rmgmag's Avatar
Glastonbury, CT
Joined Nov 2004
2,502 Posts
One of my all time favorite planes. Thanks for posting it.
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Old Nov 20, 2008, 07:16 PM
Physics hate's my ideas
GreenAce92's Avatar
USA, NY, Dunkirk
Joined May 2007
3,912 Posts
wow thats cool! and look its free!
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Old Nov 20, 2008, 08:08 PM
Suspended Account
ededge2002's Avatar
Newmarket,Ontario, Canada
Joined Dec 2002
968 Posts
very nice design of a wonderful airplane. man would that look good with some scale paint! always loved the tiny winged 104. do you know the weight made from 6mm? wonder if a 3mm lightweight could fly indoors......
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Old Nov 21, 2008, 07:24 AM
You sabotaged my plane.
eliworm's Avatar
Arizona
Joined Jun 2002
2,825 Posts
Quote:
Originally Posted by ededge2002
very nice design of a wonderful airplane. man would that look good with some scale paint! always loved the tiny winged 104. do you know the weight made from 6mm? wonder if a 3mm lightweight could fly indoors......

Thanks everyone. I tend to get lazy with paint and such especially if I'm not sure the plane will fly the way I like. I think it's time to search the web and find a good color scheme.

The weight ready to fly without battery is 7.1oz. We'll see how much that goes up with color.

Jim
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Old Nov 21, 2008, 08:34 AM
Registered User
Autryville, NC
Joined Dec 2006
244 Posts
Looks good - 'bout time we see a new eliworm design!!

KW
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Old Nov 21, 2008, 09:12 AM
gpw
“There’s no place like Foam”
gpw's Avatar
United States, LA, New Orleans
Joined Jul 2002
24,162 Posts
Eli, that's pretty COOL Dude!!!!!!
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Old Nov 21, 2008, 06:20 PM
You sabotaged my plane.
eliworm's Avatar
Arizona
Joined Jun 2002
2,825 Posts
More flights today but not much in the way of photos. It likes big wide turns, loops were surprisingly tight though. I wanted to play with slow flight but for some reason my motor kept cutting out at the worst times. I dropped full flaps one time and she would come down at about a 45 degree angle but it was controllable. Just as I advanced the throttle it cut out. I tried to get it to run again but no go. Not the best glide with the tiny wing but I got her down but with minor damage to the tail. A little ca and I was back in business for another flight. I hope I can keep her flying so i can explore the flying characteristics more. So far it's been fun and a attention grabber.

Jim
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Old Nov 21, 2008, 07:55 PM
Held by Grace
BDOG1's Avatar
Upstate New York
Joined Apr 2006
274 Posts
104 Star fighter

Very Nice Eli !
Are you using elevator ? I only see 2 servo's
Mike
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Old Nov 21, 2008, 08:51 PM
Registered User
Joined Nov 2006
180 Posts
Hello, great looking little jet Eli, May I ask what KV is the motor you are using, Thankyou Rod
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Old Nov 21, 2008, 09:02 PM
You sabotaged my plane.
eliworm's Avatar
Arizona
Joined Jun 2002
2,825 Posts
Thanks for the kind words.

3 servos, the elevator servo is behind the motor with an extension for the servo leads around the prop.

KV is 3125

Jim
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Last edited by eliworm; Nov 22, 2008 at 06:40 AM.
Old Nov 22, 2008, 09:50 PM
Pusher jets rule!
crxmanpat's Avatar
Mesa, AZ
Joined Jan 2006
17,638 Posts
Jim,

Looks like another winner! Are you going to be out Friday at Nichols (day after Thanksgiving?), or the Wingnutz field on Saturday? I really want to see this thing in person!

Pat
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Old Nov 23, 2008, 02:57 AM
Registered User
Yokohama_Japan
Joined Dec 2003
8 Posts
wow amazing!! wonderful design
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