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Old Sep 01, 2004, 06:04 PM
Having Fun!!!
FredN's Avatar
Cary, North Carolina, United States
Joined Jun 2001
501 Posts
Jet Design Contest: Micro Sport Jet

I am a little hesitant to post. There are so many spetacular planes being
developed for the contest, that I thought my simple design would not
stand up to the competition.

My goals was to design a small, easy to build jet. I wanted most of the
equipment to be housed in the fuselage. The specs of version 1 are:

24 in span
6.5 oz
GWS EDF40
Feigao 1208436 Brushless motor
3s 520 tanic pack

I plan on testing cones with different size outlets to find which performs the
best.
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Old Sep 01, 2004, 06:05 PM
Having Fun!!!
FredN's Avatar
Cary, North Carolina, United States
Joined Jun 2001
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Picture:
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Old Sep 01, 2004, 06:20 PM
Having Fun!!!
FredN's Avatar
Cary, North Carolina, United States
Joined Jun 2001
501 Posts
I have 3 questions:

1) I am looking for a name

2) The fan is mount about 3/4" behind the fuselage pod. Would it
be better if it was mounted farther back.

3) The fan itself has a molded curved lip on the front edge of the
duct. (See attached picture). Is this OK? Any additions recommended
to increase performance noticeably.

thanks,
Fred
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Old Sep 01, 2004, 06:20 PM
Watts is life...
rcjetpilot's Avatar
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A few months back Quite-Flyer posted a question in the jet forum. They were looking for pictures of EDF park flyers for they're special coverage of edfs. I'd say you hit the mark big and would have had a picture included! Very nice...

Please post more info as I'm sure many others are interested.

Would really like to hear about version 2

Bob.
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Old Sep 01, 2004, 06:23 PM
Watts is life...
rcjetpilot's Avatar
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1) Park-E-Cat
2) All depends on your CG and best the radio gear/pack fits where you want it. If it works good then I'd say leave it be.
3) Inlet lip is perfect just experiment with the tail cone.

Bob.
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Old Sep 01, 2004, 06:49 PM
Having Fun!!!
FredN's Avatar
Cary, North Carolina, United States
Joined Jun 2001
501 Posts
Bob,

Thanks!

Fred
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Old Sep 01, 2004, 07:41 PM
EDF rules... :)
AirX's Avatar
Joined Nov 1999
13,586 Posts
Quote:
Originally Posted by FredN
I have 3 questions:

1) I am looking for a name

2) The fan is mount about 3/4" behind the fuselage pod. Would it
be better if it was mounted farther back.

3) The fan itself has a molded curved lip on the front edge of the
duct. (See attached picture). Is this OK? Any additions recommended
to increase performance noticeably.

thanks,
Fred
Fred,

1) I dont know what to call it...
2) the fan is fine where it is, the little bit of turbulence is minimal, you will here the fan make more noise than usual if it does effect it.
3) The lip is needed to help the fan breathe at low airspeed, at high airspeed it offers minimal drag. To get more performance just add an exhaust tube on the back with an exit diameter of 88% of FSA(fan swept area= the ID of the shroud less the od of the motor holder). To get more just add the Feigao motor and 4s lipos, make sure that a heat sink is on the motor to help keep the temperature down.

Cheers,

Eric B.
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Old Sep 01, 2004, 08:08 PM
go fly! no crashes!
Synwpn's Avatar
Honolulu, HI
Joined Jun 2003
2,845 Posts
what Eric B. said. I see you got a heatsink on your ips motor. you can use that on the Feigao motor (just peel the label off of the Feigao first).

good luck! looks like a fun jet!
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Old Sep 02, 2004, 12:52 PM
89" Kool Aid drinker.
Smash McCrash's Avatar
United States, CA, Ventura
Joined Dec 2001
3,133 Posts
Nice looking little plane. I like the full fuse as compared to a lot of the other park jets out there, like the Mountain Models ParkJet. I am interested to hear about the performance of the Feigao in the EDF40 on 3S.

Thanks for sharing, and, if you decide you want to, I would be interested in plans or a kit.

Mike
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Old Sep 02, 2004, 02:14 PM
Nickel what?
Phreakish's Avatar
Prescott, Arizona, United States
Joined Jan 2003
2,365 Posts
I'd love to hear some about that motor/fan combo! please share.
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Old Sep 02, 2004, 06:07 PM
Having Fun!!!
FredN's Avatar
Cary, North Carolina, United States
Joined Jun 2001
501 Posts
I have the Feigao brushless motor. I did remove the
label before I put on the heat sink. I measured 3 amp
draw when I first revved up the motor with a 3s pack.
I did not think about a 4s pack. Do you think the
motor would be able to handle that?

I made up some cones out of paper to test. I made
a staight, 92%, 88% and 82% as shown in the photo.
Hopefully I will get a chance to experiment with them
this weekend.

Fred
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Old Sep 02, 2004, 07:12 PM
go fly! no crashes!
Synwpn's Avatar
Honolulu, HI
Joined Jun 2003
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well, i didnt run mines for full flight. just static testing on my worktable. i tested it with a 4s2p pack i had lying around. it got warm, would be hot if i ran it for anything length of time i think. the problem i had was that i kept popping off the rotor. going to ca it in later and test again.

i dont know how long that little motor will live on a 4s pack, but i intend to find out.
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Old Sep 03, 2004, 04:49 PM
Fly it like you stole it..
Tram's Avatar
Florence, Al
Joined Oct 2000
29,301 Posts
That thing is a cute little bugger.. I'd fly it.
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Old Sep 05, 2004, 08:23 PM
Having Fun!!!
FredN's Avatar
Cary, North Carolina, United States
Joined Jun 2001
501 Posts
Update:

Version 1 has crashed. I made a flew version2. The major changes
from version 1 to version 2 are:

1) Lighter - 3/4 oz lighter by using contest balsa and 1/32 plywood
instead of 1/16.

2) Different airfoil. A semi symmetrical this time.

Version 2 flies better! It is pretty zippy now. and has a nice flat glide
to landing.

I tried the different cones and noticed an improvement in speed with the
94% and 88% cones. The 82% and no cones close to the same.

I made a new cone and will put more flights on the Zippy-Jet (does
that sound like a good name):
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Old Sep 05, 2004, 08:30 PM
EDF rules... :)
AirX's Avatar
Joined Nov 1999
13,586 Posts
"Zippy" sounds good...

Eric B
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