|Sep 01, 2004, 06:04 PM|
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
Feigao 1208436 Brushless motor
3s 520 tanic pack
I plan on testing cones with different size outlets to find which performs the
|Sep 01, 2004, 06:20 PM|
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.
|Sep 01, 2004, 06:20 PM|
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
|Sep 01, 2004, 06:23 PM|
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.
|Sep 01, 2004, 07:41 PM|
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.
|Sep 01, 2004, 08:08 PM|
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!
|Sep 02, 2004, 12:52 PM|
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.
|Sep 02, 2004, 06:07 PM|
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
|Sep 02, 2004, 07:12 PM|
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.
|Sep 05, 2004, 08:23 PM|
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
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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