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Apr 23, 2006, 02:40 PM
registered foam addict
chara's Avatar
Thread OP
Build Log

"Harpy-Cat" .... foam pusher jet

I've followed those popular Bob/Alley/Jet/Fat/Callitwhatyoulike-CAT posts with interest and I liked the design of "the cat" more and more and wanted to build something similar.
I also was in the phase of redesigning one of my last years favorites the Harpyia (forward swept wings this time )
Since I'm a lazy swine I thought I'd do both things at the same time, take my favorite features of both and merge them to a new design .

That's how far I got during weekend...

- forward swept wings, strakes, twin-fins for better low speed/High AoA performance
- pusher configuration with elevator in slipstream for that extra "bite your tail authority"
- full fuse to neatly hide those ugly batteries/leads/electronics and cleaner aerodynamics - more speed (thanks vyceroy for the inspiration)


UPDATE: find PLANS collection on next post!
Last edited by chara; May 01, 2008 at 01:28 PM. Reason: it's going to be a build log rather than "discussion"
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Apr 23, 2006, 02:49 PM
registered foam addict
chara's Avatar
Thread OP
...more pics....

...It was also a good exercise for 3d CAD. and so easy to take the "pictures"

As you can see dimensions will be 48x58cm. I want to stay below 250g AUW. 11V/7A outrunner brushless with a 5" Günther prop (up to 7" prop possible).
I try to minimize build effort and number of parts to be cut out (reason: see previous post ).

in case someone is interested I'll keep posting about the outcome (chuck glider flies very nice so far).


Following SGTalon's suggestion here we have a collection of all HARPY versions so far with PLANS (as far as available)...
Last edited by chara; May 01, 2008 at 01:33 PM. Reason: author can not read his own graphics. it is 48cm not 45cm ;)
Apr 23, 2006, 03:13 PM
Krued Up
snolord1's Avatar
Me likey Chara.I'm with you on this one. looks awsome.

Apr 23, 2006, 03:15 PM
MaxAmps CMO
JAM's Avatar
Chara rip me a set of plans...........If you don't mind I'd like to give this a whirl.......I'll post what I come up with here.........I love the look........

JAM [email protected]
Apr 23, 2006, 03:28 PM
registered foam addict
chara's Avatar
Thread OP
Thank you guys! I'm glad you like it!

Jam I'll be happy to send you anything I have available. I'm working on the servo and control surface setup right now. I have got some ideas how to further increase low speed controllability and maybe even compensate propeller torque. If you don't mind waiting until tomorrow I'll mail you the latest plans, 3D snapshots and parts layout ... I love that 3D CAD stuff! )

Apr 23, 2006, 03:58 PM
MaxAmps CMO
JAM's Avatar
That would be great.........I'll check my unwanted e-mail slot when I get home Monday night from work....I'm sure it will end up there seeing that I have never got anything from you before.......I can't wait to see it........thanks and later.....

Apr 23, 2006, 05:34 PM
The Big Kahuna of Foam.
bkahuna's Avatar
Looking good! I'm up for building one.
Apr 23, 2006, 05:39 PM
Or am I...
Cool. Lets see some foam!
Apr 23, 2006, 07:41 PM
Retired CAD guy
birdofplay's Avatar
Chara ,

That look like you have Rhino 3D ( or similar ) well inhand.

If you have a mind to release this desing I wouldnt mind giving it a GO !!!
I can handle most 3D formats 3ds 3dm etc.

I just finished a Housecat and here is what I posted in that forum

While I LIKE my HouseCAt ( 24" version ) see previous posts,
It is NOT the speed demon that has been advertised
at least not IMHO.
I get 21K rpm at the bench which is ~ 60mph pitchspeed
I expected a bit more "unloaded" speed.

That said it IS still totaly VERTACULAR !!!

Like, point it up and it just never stops.

To sum it ip ... Still happy, still flyin :-)


Suming it all again - I'm with you !
The "cat" design needs to be a bit cleaner to get some serious speed.
I was waiting for Vcroy but if you wanna release the 3D then I dint need plans.

A local guy an I fly these all the time.
He is from Neukirchen am Großvenediger
over on the othe side of the Mntn :-)
Apr 23, 2006, 07:46 PM
G G Ghost Pirates !!!
Vyceroy's Avatar
BOP heres the link to the thread with the fatcat plans .. Fat Cat Thread

Looks Great Chara .. gotta love those forward swept wings .. is it a flat plate or a wing with an airfoil??

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