|Jan 20, 2008, 07:57 PM|
SU-47 FSW + TV Profile Foamy
Quite some time ago Chara introduced the Harpy which was wildly successful.
That plane is still one of my Favorites. I just liked the Forward Swept Wing.
More recently in Sept '07, glovesave39 did an SU-47 profile, here is his link ...
I was doing TOMHE's F-22 about the time I noticed the SU-47.
Tomhe's F-22 design went beyond a simple Profile type layout
and I liked his style. My F-22 performs way beyond my expectations.
So I started working on My version of the Su-47 in November using
tomhe's design style.
I've made some references to that effort in the Harpy thread
and at the same time did a CAD study with the Harpy outline OVERLAYED on the SU-47 outline.
That was an interesting study and a motivating thing to do,
as they were quite similar and the Harpy as I said above,
has been one of my Favorite Foamys of all time.
Then Mike Mayberry, aka maybz, asked me to cut a bunch of F-14's for him
and THAT pretty much stopped the SU-47 in it's tracks, not to mention the
'07 Holidays comming on.
While waiting for MORE FOAM for yet still MORE F-14's and now that
Christmas is over, I have revisited the SU-47 once again.
I spent a day TILTING IN the fuse sides and making other changes
as I decided that I had made it too boxy looking on the first "go around" .
On my Protoype I made airfoils by gluing a CF Rod on top of the wing
and then gluing a 3mm depron sheet over that.
I am reasonably sure that a flat CF strip could be just as easily installed
and it would fly similarly. The reason for my airfoil attempt was a lingering
promise in the Harpy thread to try one out on the Harpy. It never happened.
With the extra stuff it came out at 16.5 oz.
The Komodo 278 and 7x6 prop combination didnt yeild as much
speed as I wanted but it still goes Verticle nicely.
Stay tuned as I'm still experimenting.
I've included a PDF and some jpg files of my design below.
Wing span is right at 30" ,
Length is ~ 41"
Prototype is ~ 16 oz with
a Mid mounted Komodo 278v2 and 7x6 prop for power
I used 1700ma Lipos with a T-bird-18 ESC,
a full sized AR7000 Spectrum receiver plus
two HXT900 servos running those
Tabbed Elevons for those thrust vectored wildside maneuvers !
The canards are currently fixed and non functional.
I've finally test flown it, after a long wait for good weather
here in the Northwest.
From it's 4 flights I have to say I like it !
It does that nifty TV flip like we've come to expect :-)
It's a little longer than most so it appears a bit more graceful IMHO.
I still want to play with CG a bit and possibly add a servo to articulate
I hope you find it as interesting as I do.
Enjoy and lets hear how you like it.
VID here http://www.rcgroups.com/forums/showt...99#post8976114
Here is the Link to the Scaled and Tiled PDF
ImagesView all Images in thread
|Jan 20, 2008, 08:10 PM|
A few more building details may be necessary.
Regarding the PDF part plans:
I have segmented some parts so that they will all fit
inside an 18" x 18" x 2" pizza box.
You are more than welcome to combine them to reduce
gluing and assy work. Especially the wing halves.
The Elevons are set up for Thrust Vectoring.
I used two plastic hinges each side. Glued into slots in teh 6mm depron.
But first I groved out the elevon on the bottom and glued a CF
stiffener across the whole elevon as I was expecting lots of force
from the prop blast to be hitting them.
I used the same Horns as maybz used in the F-14 swing wing.
Max delfection is HIRATE and Low rate is 50% of that.
The horns are low and only allow about the right amount of max.
I used two HXT900 servos.
As for the CG: I started at the Wing tips.
IE draw a line frorm Tip to Tip and balance on that line !
or a bit forward for good measure.
That is about how trh Harpy worked out.
And from what I've seen on the X-35. it is similar.
The vid finally up loaded :-)
|Jan 20, 2008, 08:41 PM|
|Jan 20, 2008, 08:43 PM|
Joined Sep 2004
Slow possibilities, too?
Slow, I mean 2-5 feet off ground doing lazy circles? [drives some people WILD to see a very high performance jet do this]. smiling.
[old man here, but loves the looks and perf possibilities in this design].
LarryR : )
|Jan 20, 2008, 09:00 PM|
Check the VID I managed to upload a few minutes ago.
YES, in fact most of the latest crop of TV designs DO well flying slowly.
My current crop of Foamys all fly nice and slow if you prefer.
Kinda like having a CORVETTE and Cruisin real slow !
The SU-47 just happened to have an oversized prop so it wasnt as fast
as I'd expected but it did have a seemingly unending verticle and good
Hi AOA slow speed.
The Harpy was always great at low and slow too.
Real slow is an 88" Bucaneer "flying" 8's on the field with ONE wheel touching !
Ah those calm late summer evenings ! :-)
|Jan 20, 2008, 09:16 PM|
Looks good Bob, I was testing a 2805 motor from UH today to go in the F-14. Looks like a good choice for this one too. got 155 watts at 15 amps on a 3S 1000 and a 4.5x4.5 prop at 2800Kv. should give me some good speed.
|Jan 20, 2008, 09:44 PM|
Joined Sep 2004
And how will this [on paper, at least] compare to the Komodo referred to in the beginning. I have an order in to UH right now waiting to be shipped and am going to place an order for 2805, 2812, and 2822.
Tell me how you expect it to compare to the K motor and why, ok?
LarryR : )
|Jan 20, 2008, 09:49 PM|
Joined Sep 2004
Battery; 2/3 cell 7.4 or 11.1 volts?
LarryR : )
|Jan 20, 2008, 10:18 PM|
3S1P 1700ma for this prototype.
3 cells !
The nomenclature is S for seriies connections
and P for Parallel connections
Here it's just 3 cells.
If its was a bit lighter I'd go with 1300ma size.
Thanks DAVE ! :-)
RE Komodo - It's difficult to say because I've modified the motor
with a custom wind and different magnets and, well...
I've missplaced my data :-(
Still the over riding rule of thumb is 100 watts for every pound
for reasonable performance.
More for MORE enthusiastic performance.
My F-22 is ~ 20oz but it's doing ~ 250 watts and goes STRAIGHT UP !
It's using 4s1p lipos too. :-) wheee :-)
|Jan 20, 2008, 10:41 PM|
The F-14 site is here
|Jan 20, 2008, 10:51 PM|
Joined Jan 2007
Very nice work!
I scaled your PDF at 1x and tiled it to LETTER size tiles (8"x10.5" for printing at 100%, centered on letter-size paper) with the current ScaleAndTile3, _v3i. See PDF below.
Many thanks for providing this PDF for our foamy enjoyment.
|Jan 20, 2008, 10:54 PM|
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