HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Apr 25, 2008, 03:40 PM
I want to fly everything!
Lance Nordby's Avatar
Hillsboro, OR, USA
Joined Mar 2004
962 Posts
Discussion
F-20 Tigershark Build Thread

Peoples,

I submit for your perusal, images of my F-20 design.

I had the good folks at Manzano Laser cut the parts for me.

Soon to follow are build photos.

It has all wood construction - mostly balsa, some lite ply, a little heavy ply, and hardwood. Sort of a giant Guillow's model (see my F-16 Guillow's thread). Or in other words, an attempt to try and emulate Pat Trittle's design approach in a jet airframe.

If it goes in, it will disintegrate like a real jet.

Wingspan 32" (scale, not stretched, wooooooo)
Length 57"

It will have retracts and flaps because taking off and landing pretty is half the fun.

Designed for Klaus' 400 fan unit although the Wemotec unit can be fitted.

The concept here is to build as light as possible and use a relatively small fan with a maxed out power setup. I'm thinking a Neu motor is in order. Maybe use a 6s battery or two 3s packs in series. That way I can use the 3s packs for something else if desired. Plus a higher cell count means a smaller and lighter ESC can be used as well as smaller wires. Any advice or opinions here would be appreciated.

I realize that this thing is not going to fly as fast as some ducted fan jets but that is ok. I am going for scale flight speed, not mach 9.

I wanted to create an accurate scale model that had all the curves and subtle features that most if not all the existing F-20 models are lacking. Something you could detail up for a scale contest if so desired.

Because I'm such a skin-flint I also wanted a larger jet (but not too big to fit in the back of my 944) that didn't cost a lot of bucks to build and equip.
Lance Nordby is online now Find More Posts by Lance Nordby
Last edited by Lance Nordby; Apr 25, 2008 at 03:47 PM.
Reply With Quote
Sign up now
to remove ads between posts
Old Apr 25, 2008, 03:57 PM
Sink stinks
Montag DP's Avatar
United States, GA, Atlanta
Joined Apr 2005
4,533 Posts
Looks awesome to me. I also really like Solidworks' rendered modes. I'm using TurboCAD and the renders look pretty good but they don't show the part outlines.

Looking forward to seeing the build!
Montag DP is offline Find More Posts by Montag DP
Reply With Quote
Old Apr 25, 2008, 04:05 PM
I want to fly everything!
Lance Nordby's Avatar
Hillsboro, OR, USA
Joined Mar 2004
962 Posts
Wow that was a quick response.

Very astute call recognizing SolidWorks. This whole process is like magic.

I'll post build pics tonight.
Lance Nordby is online now Find More Posts by Lance Nordby
Reply With Quote
Old Apr 25, 2008, 04:10 PM
Senior Member
Arngeir Blakseth's Avatar
Molde, Norway
Joined Jan 2001
2,458 Posts
Signing on, this is interesting stuff. I've always fancied the F-5/F-20 and alltough I have a HET F-20 it can't exactly be called true to scale.

For a lot of power in the WM400 on 6S, a Neu 1115/2D is a good motor, I'm gonna test this combo when I find the time to balance the fan. I suggest you take a look in this thread, some good suggestions on setups there : http://www.rcgroups.com/forums/showthread.php?t=853888
Arngeir Blakseth is online now Find More Posts by Arngeir Blakseth
Reply With Quote
Old Apr 25, 2008, 04:22 PM
I want to fly everything!
Lance Nordby's Avatar
Hillsboro, OR, USA
Joined Mar 2004
962 Posts
Thanks Arngeir, I'll check it out.

Lance

American born, full-blood Norwegian, but the only Norsk I know is "uffda" (its what you say when you crash and other things).
Lance Nordby is online now Find More Posts by Lance Nordby
Reply With Quote
Old Apr 25, 2008, 04:23 PM
2014 EDF JET JAM We be Jamming
Kevin Cox's Avatar
St. Louis Intl, Missouri, United States
Joined Jan 1997
6,854 Posts
Nice!

Ahhh...you like balsa, build to fly scale like and own a 944? We have a few things in common, I also have a 944 (951)
Kevin Cox is offline Find More Posts by Kevin Cox
Reply With Quote
Old Apr 25, 2008, 04:50 PM
DELTAS RULE
corsair nut's Avatar
tehachapi, CA
Joined Jan 2006
22,444 Posts
that is SWEET. the F-20 is one of my all time fav's.
corsair nut is offline Find More Posts by corsair nut
Reply With Quote
Old Apr 25, 2008, 05:01 PM
Big gov never Works
St. Martin's Avatar
Skunk Water, Rhode Island
Joined Jul 2002
12,385 Posts
I like that, Lance! Will you be sheeting the structure or using shrink film? I also enlarged the Guillows F-16. But, I ended up changing it to a pusher. I insert planked only certain areas and silked the rest, open structure. In the air, you could not notice.

Fuzz
St. Martin is online now Find More Posts by St. Martin
Reply With Quote
Old Apr 25, 2008, 09:32 PM
I want to fly everything!
Lance Nordby's Avatar
Hillsboro, OR, USA
Joined Mar 2004
962 Posts
Hey, there's some interest here.

Alright Kevin, mine's a '91 S2. My neighbor down the block has a 951. There's another guy on ezone (944S2) that writes for a fairly well known car magazine who influenced my decision to get an S2 (simpler, lower insurance, the "T" word u-know). Hey, I'm hijacking my own thread.

Fuzz: I suppose it could be left open structure but I plan on sheeting with contest balsa and then nelson lite film (solite). It looks so much better sheeted and doesn't add much weight if light balsa is used.

I think the F-20 is a mean looking jet. Plus it's configuration makes landing gear installation fairly straightforward. And it was the underdog that lost and I feel sort of sorry for it.

Build photos soon...
Lance Nordby is online now Find More Posts by Lance Nordby
Reply With Quote
Old Apr 25, 2008, 10:03 PM
Sink stinks
Montag DP's Avatar
United States, GA, Atlanta
Joined Apr 2005
4,533 Posts
Lance, how do you plan on making the ducting for it? Do you have vacuum-forming capabilities?

I just finished designing one plane, which is a ducted fan jet but not a scale model and doesn't require any complicated ducting. Since I have to wait to build it I want to start a scale subject now, but I'm limited to things like the F-86 that have a fairly simple ducting design.
Montag DP is offline Find More Posts by Montag DP
Reply With Quote
Old Apr 25, 2008, 11:43 PM
DELTAS RULE
corsair nut's Avatar
tehachapi, CA
Joined Jan 2006
22,444 Posts
only reason it lost was politics. the F-20 would wife the sky with a F-16.
corsair nut is offline Find More Posts by corsair nut
Reply With Quote
Old Apr 26, 2008, 12:59 AM
I want to fly everything!
Lance Nordby's Avatar
Hillsboro, OR, USA
Joined Mar 2004
962 Posts
Here's progress so far.

The ducting is actually very simple and has no compound curves so it can be made from balsa. I might have to wrap it with some hi-tech thread to strengthen it. I should post an image with the ducts turned on.

Ok, enough messing with a computer - I gotta go to bed.
Lance Nordby is online now Find More Posts by Lance Nordby
Reply With Quote
Old Apr 26, 2008, 06:34 AM
Registered User
dave morris's Avatar
orlando fl
Joined Oct 2000
5,713 Posts
great job, I like the way you described the goals, then designed to meet them. it has been a while since we have seen a good build.
dave morris is offline Find More Posts by dave morris
Reply With Quote
Old Apr 26, 2008, 07:49 AM
Registered User
USA, CT, Farmington
Joined Nov 2003
879 Posts
Very nice! Signed on!
imodel is offline Find More Posts by imodel
Reply With Quote
Old Apr 26, 2008, 08:36 AM
"I passed on the kool-aid"
Waco, TX
Joined Jan 2004
3,884 Posts
I love the 951 and S2 as well....

and have been thinking about getting one eventually. Just bought a 986 a few months back and want to someday get one of everything they have made. The 944 series has always been at the front of that list because it is fairly econonical and looks so muscular.

What type of retracts are you going to use on this? The build so far looks great.
papasmurf is offline Find More Posts by papasmurf
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Build Log Phoenix ModelsŪ F-20 Tigershark ARF Build thacherd Fuel Plane Talk 22 Apr 23, 2010 04:18 PM
Discussion thorpe f-20 tigershark build Fire42 Electric Ducted Fan Jet Talk 21 Oct 03, 2008 10:41 AM
Discussion F-20 EDF build thread corsair nut Foamy EDFs 56 Oct 08, 2006 11:04 PM
F-20 Tigershark...Anyone Interested? av8ercfi Electric Ducted Fan Jet Talk 9 Oct 14, 2002 07:20 AM
F-20 Tigershark help flailing Scale Kit/Scratch Built 0 Jul 19, 2002 01:29 PM